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revision 1.16 by cnh, Tue Nov 3 15:31:08 1998 UTC revision 1.361 by mlosch, Wed Sep 29 12:27:09 2004 UTC
# Line 3  $Header$ Line 3  $Header$
3      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
4      ==============================      ==============================
5    
6    o pkg/cost
7      extend simple cost functions to treat time mean quantities
8      (T,U,V) via cost_accumulate_state from cost_tile
9    o multidimAdvection on CS-grid: implement the full 3 pass ; overlap needs to
10        be 2 times larger than the minimum size the advection scheme requires.
11        now get a perfect conservation of salt in advect_cs test-exp (updated)
12    o GGL90 (Gaspar's TKE mixed layer)
13      - add horizontal diffusion of TKE, requires exchanges in
14        do_fields_blocking_exchanges, horizontal diffusivity is zero by
15        default. In OPA there is no horizontal diffusion of TKE but the
16        mixing coefficients are computed from a horizontal average of TKE of
17        6 points or so. I think that diffusion has a little more physical
18        justification.
19      - clean up ggl90_calc in the hope of reducing memory usage (this hope
20        was in vain)
21      - mask tke-variable in ggl90_init
22    o fix mask Pb in multidimAdvection on CS-grid (still a small Pb with ipass)
23    o fix biharmonic diffusion on CS-grid.
24    o more obcs stuff
25      - added obcs_external_fields_load as an alternative to the EXF-pkg option
26        for reading boundary values. This routine is called from
27        obcs_prescribe_read
28      - updated obcs_check
29      - changed sponge layer relaxation parameter units for days to seconds
30      - turned off sponge layer by default
31      - changed argument list of OBCS_CALC to myTime+deltaTclock
32      - fixed about 35 bugs in obcs_external_fields_load
33    
34    checkpoint55c_post
35    o obcs stuff
36      - new runtime flags useOBCSprescribe, useOBCSbalance
37      - re-arranged obcs_calc
38      - moved exf_getobcs to obcs_prescibe_read
39        obcs_prescibe_read is called after ORLANSKI stuff
40        and independent of it (executable can contain all).
41      - updated obcs_check
42      - added exchanges for U,V,gU,gV for useOBCSprescribe=.TRUE.
43        These may be necessary only if tangential velocities are
44        prescribed at OB, not sure, needs testing.
45    o make the MNC_CW_ADD_VATTR_* subroutines all take scalar arguments
46      which simplifies the calls and passes the ifc check-bounds test
47    
48    checkpoint55b_post
49    o add a 2D scalar, Z location, exchange_2 routine.
50    o EXCH_UV for CS-grid: add one u,v in the corner-halo region, allows
51      to compute vorticity on a wider stencil [e.g., vort3(0,1)&(1,0)]
52      affects advect_cs results (for the wrong reason): update output.txt
53    o use a more standard discretization for biharmonic viscosity ;
54     (original version still available with #define MOM_VI_ORIGINAL_VISCA4 )
55      affects results of dome set-up: update output.txt
56    o fix gad_advection.F (CubedSphere part), back to version 1.23
57    o fix bug in mom_vi_del2uv.F (CubedSphere part).
58    
59    checkpoint55a_post
60    o merged code to
61      * prescribe/read time-dependent open boundaries
62        (works in conjunction with exf, cal)
63      * sponge layer code for open boundaries
64      * each boundary N/S/E/W now has its own CPP option
65        (healthy for the adjoint)
66    
67    checkpoint55
68    o up-to-date adjoint of previous breaks
69      - natl_box_adjoint: problem for exp 12, 13: cost = 0. needs fix
70      - global_ocean_ebm: adjoint still needs fix (TLM ok)
71      - global_ocean.90x40x15: extended GMREDI_OPTIONS.h
72      - carbon: * remove tr1-related adjoint verification
73                * add ptracer as control variable
74    o remove all tr1-related code (ALLOW_PASSIVE_TRACER)
75      (adjoint stuff still has some tr1 'names', but all use ptracer arrays)
76    
77    checkpoint54f_post
78    o in verification/carbin/ remove experiment related to
79      ALLOW_PASSIVE_TRACER (array tr1 etc)
80      code_ad/ input_ad/ results_ad
81    
82    o add two new packages
83      - ggl90, TKE-model of Gaspar et al. (1990), Blanke+Delecluse (1993)
84        + subject to optimization (memory)
85      - opps, OPPS (ocean penetrative plume scheme) of Paluszkiewicz+Romea (1997)
86        + subject to reordering (many GOTOs in the original code)
87        + so far opps is called for every (i,j) point, and then operates in
88          the vertical; one may want to reorder the scheme in order operate in
89          horizontal slabs at the cost of (a lot of) memory, at least ten new 3D
90          fields)
91    o overhaul of IO so that we now have flags for MDSIO and/or MNC
92      - all verification tests compile and run with linux_ia32_g77
93      - defaults are compatible with current input files--nothing
94        should change if you were not previously using MNC
95      - MNC output has been added in numerous places (eg. timeave)
96        but there are still a few writes not yet do-able with MNC
97        (this is in progress)
98      - flags now allow for either/or/both use of MDSIO and MNC and
99        documentation will soon follow
100      - numerous small formatting cleanups for ProTeX
101    o add version info (via BUILD_INFO.h) to MNC and stdout
102    
103    checkpoint54e_post
104    o add two new packages
105      - pp81 (Packanowski and Philander, 1981), Richardson number and
106        stratification dependent mixing
107      - my82 (Mellor and Yamada, 1982) level 2 turbulence closure scheme
108      - these scheme operate in a similar manner as KPP (without ghat, of
109        course), however there is only one diffusivity that is used for both
110        temperature and salinity (and passive tracers)ç
111    o add offline package
112    o add "verification/dic_example" which contains a dic-gchem-ptracer setup
113      provided by Stephanie Dutkiewicz
114    o genmake2: add ability to search for C compilers and cleanup test output
115      - fixes recent SX-6 problems and should help with others (eg. HP-UX)
116    
117    checkpoint54d_post
118    o data.diagnostics: if levels() is unspecified then ALL levels are diagnosed
119    o bug fix in pkg/cal/cal_addtime.F for TheCalendar='model' day count is wrong,
120      leading to additional shift by 5 days each year of integration
121       (i.e. leading to considerable offset over the years)
122    o update global_ocean.cs32x15/thsice: use z* + RealFW + staggerTimeStep
123    o start with no AB and no initial filtering (staggerTimeStep):
124      change the results of test-exp: hs94.128x64x5, hs94.1x64x5 & hs94.cs-32x32x5
125    o move ocean specific S/R calls from forward_step.F to do_oceanic_phys.F
126      (external loading & cpl import/export stay in forward_step.F)
127    o update coupling interface to work with new staggerTimeStep
128    o change MDSIO ptracers_pickup.
129    o fix a bug in Flux deriv. vs Ts (pkg/aim_v23/phy_suflux_sice.F);
130    o genmake2 fixes so netcdf now works on halem ("osf1_alpha_*")
131    o bugs fixed in kpp_calc.F (ustarY) and external_forcing.F (Qsw & Partial-cell)
132    
133    checkpoint54c_post
134    o replace surfaceTendency U,V,S,T,Tice,Ptr by surfaceForcing U,V,S,T,Tice,Ptr
135      this affects (truncation error) output.txt of test-exp:
136       global_ocean_ebm,_pressure,.cs32x15(&.thsice), lab_sea & natl_box
137    o pkg/kpp: replace pMask by maskC to reduce memory size (one 3.D array)
138    o change Qnet to always be the net heat flux, (+upward).
139      affects (truncation error) output of natl_box exp.: updated
140    o define the max number of passive tracers in PTRACERS_SIZE.h
141    o start to test mnc routinely in exp0
142    o add sea-ice loading (sIceLoad) as a new forcing field.
143    
144    checkpoint54b_post
145    o add testreport "-j JOBS" option for parallel builds (tested and pretty
146       impressive on Altix and Opteron systems)
147    o diagnostics can now write NetCDF files through the mnc package
148    o staggerTimeStep & NLFS: update pkg aim_v23 & thsice; update aim.5l_cs output
149    o staggerTimeStep & multi-Dim-Advec: Exch(U,V) added
150    o staggerTimeStep & NLFS: rescale T & S surface tendencies.
151      affects (truncation error) output of lab_sea & natl_box exp.: updated
152    o change pickup _cd & _ptracers (old pickup restart: usePickupBeforeC54=.T.)
153    
154    checkpoint54a_post
155    o re-write staggerTimeStep: step fwd U,V and then T,S (reverse the order).
156    o change pickup file (to restart from old pickup, set usePickupBeforeC54=.T.)
157    o get a perfect restart when using RealFreshWaterFlux + NLFS (not finished)
158    o update output of all exp. that use staggerTimeStep (except hs94.cs & 2D)
159      + internal_wave (shift in writing cg2d_ini_res)
160    checkpoint54a_pre
161    
162    o require forcing_In_AB=.FALSE. and remove surfaceTendencyTice from pkg/seaice
163      - modified verification/lab_sea and natl_box_adjoint accordingly
164    
165    checkpoint54
166    checkpoint53g_post
167    o prepare splitting of thermodynamics: store convect.counter in common block
168    o store d.etaH/dt (instead of Div.hV) in common ; affects (truncation error)
169      output of: global_ocean.cs32x15, global_ocean_pressure & internal_wave
170    o cnh's modifs to gad_advection.F for cube-sphere multi-dim advection
171    o new parameter "nShapS": allow to treat differently S from T (nShapT)
172    o separate Vert.Advec.Scheme from horizontal Advec.Scheme (T & S)
173    o restore adjointability
174    
175    checkpoint53f_post
176    o modifications that affect AIM experiment results (update output.txt):
177      - no advection of S at top interface Nr (pkg/generic_advdiff)
178      - air surf. temp: use lower value between T0 & T1 (phy_suflux_prep.F)
179    o AIM pkg:
180      - include stability function into surf.Flux derivative relative to Tsurf
181      - calculate clear-sky radiation & surface temp. change (for diagnostics)
182    
183    checkpoint53e_post
184    o merged cylindrical coord configuration
185    o added rotating_tank experiment
186    checkpoint53e_pre
187    
188    checkpoint53d_post
189    o faulks upgraded: re-generate output.txt that have changed:
190       global_ocean.cs32x15(.thsice), global_ocean_ebm, lab_sea, natl_box
191    o Added Bryan and Lewis, 1979, vertical diffusivity profile
192    o pkg/land: fix problem in land_impl_temp.F when Ts arround freezing.
193    o added Sadourny discretization of Coriolis
194      - moved some PARAMETERS from mom_*_coriolis.F to PARAMS.h
195      - re-enabled use of omega3 (useAbsVorticity)
196    o added Leith (Phys. Fluids, 1968, 10, 1409-1416) variable viscosity for
197      vector-invariant equations
198      - note: does *NOT* yet use same variable visc. for no-slip BC's.
199    o recoded the lateral boundary conditions for non-hydrostatic w, this time
200      hopefully without new bugs
201      - still to do: biharmonic friction for non-hydrostatic w
202    o bug fix for mom_*_sidedrag: rA -> rAs,rAw
203    o regenerated output for global_ocean_ebm (using -ieee)
204    o fix mom_common/mom_*_sidedrag.F to recover numeric output prior to creation
205      of mom_common/
206      - simple re-arrangement of instructions within computing loop
207    checkpoint53d_pre
208    
209    checkpoint53c_post
210    o new version of coupler for AIM+thSIce and Ocean models
211     - new fields (SSS,h_MixLayer ...) are exchanged through the coupler
212     - land: change Evaporation of snow
213     - aim with thSIce: fix bug in snow-precip.
214    o changes to calc_gw.F
215     - bug fix for w^2 term near the bottom boundary
216     - (hopefully) improve the lateral slip boundary condtions for use with
217        partial/looped cells
218      - because the bug fix changes two verification experiments anyway (exp5
219        and plume on slope), change the lateral boundary condition from half slip
220        to the value of no_slip_sides
221    o ebm package wasnt quite up to the parallel task. Fixed that.
222    o Adjoint of EBM package + verification
223      * TLM OK
224      * ADM not sufficient accuracy yet (needs further testing)
225    
226    checkpoint53b_post
227    o Commiting new energy balance model to repository
228      * package is pkg/ebm
229      * verif. is verification/global_ocean_ebm
230      * references are in ebm_driver.F
231    C      * X. Wang, P. Stone and J. Marotzke, 1999:
232    C        Global thermohaline circulation. Part I:
233    C        Sensitivity to atmospheric moisture transport.
234    C        J. Climate 12(1), 71-82
235    C      * X. Wang, P. Stone and J. Marotzke, 1999:
236    C        Global thermohaline circulation. Part II:
237    C        Sensitivity with interactive transport.
238    C        J. Climate 12(1), 83-91
239    C      * M. Nakamura, P. Stone and J. Marotzke, 1994:
240    C        Destabilization of the thermohaline circulation
241    C        by atmospheric eddy transports.
242    C        J. Climate 7(12), 1870-1882
243    o Will need long integration testing.
244    checkpoint53b_pre
245    
246    o created pkg/mom_common in preparation for variable viscosity code
247    o renamed and split ini_mnc_io
248    o pkg/land: only liquid water can diffuse or run-off
249    o AIM using land: soil wetness availability account for snow
250    o added printMapIncludesZeros to EEPARMS namelist
251    
252    checkpoint53a_post
253    o restore TAMC compatiility for exf_constants.h
254      (no usage of _d in .h)
255    o Additional storing in KPP in an attempt to fix
256      TAMC problem with adjoint of KPP code.
257      (no success...)
258      Identical code works fine with TAF.
259    o Fixed verification/natl_box_adjoint experiments.
260      Initial conditions for Experiments 4 and 5 are now
261      set to "SEAICE_initialHEFF=0", which is more reasonable,
262      and hence gives results closer to that of Experiment 2.
263      Experiment 6 requires "SEAICE_initialHEFF=1" and is working once again.
264    
265    checkpoint53
266    o stable checkpoint with up to date adjoint
267      TLM tests only run for 1st grdchk at the moment. Its unclear if
268      this is a code problem or a problem with resetting code for g_
269      variables that is being autogenerated wrong.
270      Otherwise:
271       o code is testing well on Linux (P4 and AMD), SGI Alitix and Irix.
272       o IBM and HPQ tests could not be run because NCAR (IBM) and NCCS (HPQ)
273         are both still in chaos following their security messes.
274    
275    checkpoint52n_post
276    o various build (mostly genmake2) changes including:
277      - ability to build/run more easily within Cygwin and MacOS X
278      - more complicated Makefiles with a stronger dependence on Gnu Make
279    o pkg/seaice modifications
280      - added SEAICE_deltaTtherm and SEAICE_deltaTdyn in order to reduce cost
281        of pkg/seaice.  For time being, SEAICE_deltaTtherm = deltaTtracer
282        and SEAICE_deltaTdyn must be integer multiple of SEAICE_deltaTtherm
283      - changed proxy for geostrophic velocity and updated
284        verification/lab_sea/results/* accordingly
285      - removed ADI dynamic solver from pkg/seaice
286      - replaced all occurrences of 1/CSTICE or 1/CSUICE
287        they caused a segmentation fault under certain circumstances
288      - removed unused field WATR
289    o bug fix in exf-package:
290      -  u/vwind are defined at tracer/pressure points. The values of u/vwindmask
291         now reflect that.
292    o small fixes in the cal-package:
293      - set reference date to first of January for the 'model'-calendar
294      - failing of cal_CheckDate in cal_FullDate now actually results in a
295        warning
296    o small modifications in exf-package to increase flexibility:
297      - change climtempfreeze from a constant to a runtime parameter that
298        is specified in data.exf_clim (default = -1.9)
299      - introduce runtime parameter windstressmax (default = 2.0) that is
300        specified in data.exf
301    o fix in pkg/thsice:
302      - update Evap (Tsf changes) to be consistent with Latent heat flux
303      - maintain snow precipitation unchanged (even if Tsf >=0).
304     both affect global_ocean.cs32x15/(.thsice) results ; update output.txt.thsice
305    
306    checkpoint52m_post
307    o commented out call to cal_GetMonthsRec in swfrac.F and added some comments;
308      this does not change any of the results, because myIter=0 in swfrac always
309      lead to jwtype=2 (the default anyway), but the call makes little sense
310      as a default
311    o no SHORTWAVE HEATING lost at the bottom; affects lab_sea output; updated
312    o re-work pkg/thsice interface with ocean & bulk_force pkg to allow
313      atmospheric model (AIM) to use it ; add a "slab ocean" component.
314    o pkg/aim_v23 : add interface to call thermodynamic sea-ice (thsice)
315    o update global_ocean.cs32x15/output (.thsice) after changes in pkg/thsice
316    o extending useSingleCpuIO option to work with new exch2 I/O format
317      - old-style, missing-tile I/O is still accessible by defining CPP
318        option MISSING_TILE_IO in pkg/mdsio/MDSIO_OPTIONS.h
319    o monitor package can write to NetCDF files and/or STDOUT
320    o fix re-definition bug in MNC_GRID_INIT_ALL()
321    o doc/api_reference added
322      - a framework for building an API Reference Manual using all
323        the "protex" comments embedded in the code
324      - see pkg/generic_advdiff, pkg/mnc for examples
325    o MNC:
326      - make myThid the last argument for all subroutines
327      - new default for the grid files: NO halos
328      - add useMNC and other run-time flags
329      - separate per-file-group handling of the unlimited dimension
330      - early initialization of MNC w/ flags read at the eeboot stage
331        and lookup tables set in initialize_fixed
332      - write all MNC output to a freshly-created directory
333    o thermodynamics sea-ice (thsice) is now tested with testreport.
334    o test exp. advect_cs: use the standard cs32 grid ; update output.
335    o Added functionality to grdchk:
336      pick global i,j,k position (or nearest wet) where to perform check.
337    
338    checkpoint52l_post
339    o new land formulation:
340      a) use ground enthalpy as prognostic variable to ensure exact
341         energy conservation.
342      b) account for water temperature and for latent heat of freezing
343         in all processes (rain, run-off, ground storage)
344      c) compute surface and ground temperature implicitly.
345    o aim_v23 modification for new land model:
346      a) Treat separately land / ocean / sea-ice surface fluxes
347         to allow implicit computation of land & sea-ice surface temp.
348      b) add snow precipitation.
349    checkpoint52l_pre
350    
351    o fix problem (when 1 tile is empty) in min/max monitor.
352    o fix bug in timeAve (u,vZetatave in common block)
353    o no restoring terms under ice for pkg/seaice
354    o moved SEAICE_DO_DIAGS to S/R do_the_model_io
355    o bug fix for pkg/seaice pickups
356    o change MNC call locations and add coordinate attributes
357    o mask vorticity at the corner ; affects global_ocean.cs output
358    o fix ini_curvilinear_grid ; test CS experiments with mpi
359    o aim.5l_cs: modify sea-ice fraction input file ; update output
360    o exf: Adding simple range check routine for exf fields after read
361    
362    checkpoint52k_post
363    o removed top-level directory "diags"
364      - we migrated these functions to pkg/timeave a long time ago
365    o fixed bug introduced in pkg/monitor
366    o accuracy ctrlprec = 32 insuffient for gradient checks using
367      averaged fields (I/O via cost_averages)
368      -> use ctrl.h in active_file*.F to control I/O precision.
369    o paramter list of CALL ADTHE_MAIN_LOOP
370    o added initial do_the_model_io to ecco
371    o set all ...Freq to zero after cost_final
372      taveFreq, dumpFreq, pChkptFreq
373    o MAIN and ECCO differentiability restored
374    
375    checkpoint52j_post
376    o fix nchklev in tamc.h for global_ocean...
377    o Bringing flow and store directives up-to-date
378    o Really weird thing!
379      call do_the_model_io from the_main_loop with parameters
380      starttime, niter0, instead of mytime, myiter, screws up the adjoint:
381      TAF places a faulty re-call of initialise_varia
382      after cost_final call which should not be there!
383    checkpoint52j_pre
384    
385    o tweaked pkg/mdsio/mdsio_readfield.F to have more useful logic and
386      error messages
387    o fix errorMessageUnit problem. remove old version of mdsio from eesup/src
388    o modified pkg/mdsio/mdsio_readfield.F -- commented out diskspace-eating
389      debug output
390    o modfied mdsio_writefield.F to handle non-global files under exch2
391    o update AIM Cubed-Sphere exp (aim.5l_cs):
392      use land, p*, and Franco.M forcing fields with fractional land-sea mask.
393    o update AIM Equatorial Channel exp:
394      use standard aim_v23 pkg and change the SST fields to be more realistic.
395    o globalFile now works with exch2
396    o merged mom_vi_calc_relvort3.F, mom_vi_del2uv.F and
397      mon_vort3.F to make exch2 friendly with >1 tile per cube face
398    o limit timeave output for hi-res integrations
399    
400    checkpoint52i_post
401    o removed CPP_EEOPTIONS.h from verification/*/code
402    o updated the tiling for global_ocean_pressure
403    checkpoint52i_pre
404    
405    o update aim.5l_LatLon using the standard aim_v23 pkg (instead of
406      the old pkg/aim).
407    
408    checkpoint52h_pre
409    o shortened offending lines in exch2_send_rx?.template
410    o modified W2_EXCH2_TOPOLOGY.h to reflect current topology generator
411    o genmake2: add build & execute test for NetCDF code
412    o modded aim.5l_cs and global_ocean.cs32x15 to use exch2, removed
413      old grid files, moved CPP_EEMACROS.h to pkg/exch2
414    o added useSingleCPUIO flag to monitor.F and mon_out.F
415    o added temporary hack for sea-ice dynamics on the cube:
416      metric terms are ignored and it is assumed that
417      there is no sea-ice on cube faces 1, 2, 4, and 5.
418    
419    checkpoint52f_post
420    o added exch2 cube routines to pkg/exch2
421    o modified hs94.cs-32x32x5 to use it
422    o added new grid files to hs94.cs-32x32x5
423    checkpoint52f_pre
424    
425    checkpoint52e_post
426    o first attempt to solve vertical advection (momemtum & T,S) Implicitly
427      for now, only implemented with Lax-Wendroff (tracer) and VectInv (mom)
428    o step.1 : rewrite (as in MultiDimAdvec) explicit tracer stepping (gad_calc_rhs.F)
429      to work with implicit vertical advection and AB ;
430    o Implic. vert. advect. implemented with flux-limiter, c2, u3 and c4 scheme.
431    o update output (gad_calc_rhs.F changes affect truncation error) of exp:
432     front_relax, global_ocean .cs32x15 & _pressure, internal_wave, lab_sea, natl_box
433    checkpoint52e_pre
434    
435    o fix bug in impldiff when Nr=1 or Nr=2.
436    o change the albedo in pkg/thsice (as GISS model); update output_thsice.txt
437    o little changes (fftpack, aim/phy_suflux ...) to pass the "checkbounds" test.
438    o fix deltaTfreesurf in update_cg2d.F (left from c45d_post): affects 2
439      ocean exp. that use NLFS: global_ocean.cs32x15 & global_ocean_pressure
440    o added exf_offset_atemp for Celsius to Kelvin conversion of atemp
441    o eesupp/inc/EEPARAMS.h: MAX_NO_PROCS=1024
442    o pkg/cal/cal_toseconds.F fix for long (>60 years) integrations
443    
444    checkpoint52d_post
445    o re-tiled many expts to allow comparison in multi-processor mode
446      - updated output accordingly
447      - changed hs94.128x64x5 to use intial T from file rather than use the
448        random number generator
449    o add infrastructure in model routines for fizhi and gridalt packages
450    o change global_ocean.cs32x15 because of Pb with GM on CS-grid.
451    o changes to permit hi-res, cubed-sphere, configuration
452      - added useSingleCpuIO capability to mdsio_readfield.F and exf_interp.F
453      - added "#undef ALLOW_USE_MPI" support to eesupp/src/scatter_2d.F
454      - added pkg/exf/exf_set_uv.F for on-the-fly interpolation and rotation
455        of surface winds for the cube
456      (A verification experiment, based on global_ocean.cs32x15, but with
457       pkg/seaice turned on and with on-the-fly interpolation from the NCEP
458       Gaussian grid is described in MITgcm_contrib/high_res_cube/README_ice,
459       complete with example surface forcing files and matlab scripts to look
460       at the output and compare it with that of global_ocean.cs32x15.)
461    o packages pickup: $PKG_write_pickup called from packages_write_pickup ;
462       but call to $PKG_read_pickup remains in $PKG_ini_vars: change CD_code
463       to conform to the common rule.
464    o check-in the first version of the coupler + interfaces for multi-components
465       set-up (Chris's version, adapted to work on cubed-sphere grid); use MPI.
466       - imply modification in eesupp (MPI_COMM_MODEL < MPI_COMM_WORLD).
467       - atmosphere: use pkg aim_v23 ; no sea-ice for now.
468       - ocean and atmos. share the same horizontal grid (no interpolation).
469       - exchanges between component and coupler is done in forward_step
470    o new verification experiment, cpl_aim+ocn:
471       coupled ocean - AIM atmosphere on cs32 grid.
472    
473    checkpoint52d_pre
474    o surface flux time-av diagnostic modified for NLFS & RealFreshWater
475    o add call to AIM pendant S/R in external_forcing & external_fields_load.F
476    
477    checkpoint52c_post
478    o Fixing OPTIONS files for use of exf:
479      - ALLOW_ECCO not needed
480      - ECCO_CPPOPTIONS.h should not be included from
481        EXF_OPTIONS.h/CAL_OPTIONS.h, but from CPP_OPTIONS.h
482        as has been the case in the past
483      - All cal/exf related options are currently set in
484        single header file. Should remain so until we
485        agree on a consistent new policy.
486    o Removed all CPP options for cal package.
487      cal has no more CPP options.
488    o modified STOREs in GAD_ADVECTION
489    o corrected key comp. for passkey
490    
491    checkpoint52b_post
492    o new version: "thsice" of thermodynamic sea-ice pkg:
493     - only 1 call from "forward_step"; conserve energy, fresh-water & salt.
494     - modify fluxes but do not change theta directly;
495     - light cleaning of bulk_force pkg (still needed with thsice).
496     - add forcing fields + data files in global_ocean.cs32x15/inp_thsice
497       + output_thsice.txt to test thsice & bulk_force pkgs.
498    o put back grid & coriolis monitor output.
499    checkpoint52b_pre
500    
501    o call "do_the_model_io" at the beginning (=> dump initial state)
502    o use rhoConstFresh to define convertEmP2rUnit (was done only in ocean-P)
503    o sort out interplay between tamc.h and PTRACERS_OPTIONS.h
504      (need info on NUMBER_OF_PTRACERS)
505    o missing PTRACERS headers in some routines
506    o default tamc.h in pkg/autodiff supposed to crash
507      to ensure proper customization
508    
509    checkpoint52a_post
510    o modifications to make FREEZE (_SURFACE) flux visible to pkg/kpp
511      - moved surfaceTendencyTice from pkg/seaice to main code
512      - subroutine FREEZE_SURFACE now limits only surface temperature
513        and is called in FORWARD_STEP (if allowFreezing=.TRUE.)
514        => new output.txt for global_ocean.cs32x15 & global_with_exf
515      - keep the old version of FREEZE for backward compatibility;
516        global_ocean.90x40x15 left unchanged using useOldFreezing=.TRUE.
517      - corresponding modifs for TAF directives
518    o added surface flux output variables to TIMEAVE_STATVARS
519    o time-averaged output for pkg/ptracers
520    o fix problem with ECCO-related divided adjoint
521      snapshot file was missing some ad-variables,
522      but no warning issued by TAF
523    
524    checkpoint52a_pre
525    o some bug fixes for #undef REAL4_IS_SLOW
526    
527    checkpoint52 = ecco_c52_e35
528    o after testing adjoints of checkpoint51u_post
529    
530    checkpoint51u_post
531    o this is the post-merge tag of the ecco-branch
532      (needs another clean checkout and re-testing)
533    o various natl_box_adjoint configs and results
534      but no input fields
535    o obcs adjoint not yet merged!
536    o adding ECCO global 1x1 and 2x2 degree configs
537    o updated/extended some store directives for seaice
538    o pkg/ecco now containes ecco-specific part of cost function
539    o top level routines the_main_loop, forward_step
540      supersede those in model/src/
541      previous input data.cost now in data.ecco
542      (new namelist ecco_cost_nml)
543    o in ctrl/ cleaned some cross-dependencies and updated CPP options
544    
545    checkpoint51t_post
546    o this is the pre-merge tag of the ecco-branch
547    
548    checkpoint51s_post
549    o cleanup: removed various obsolete #define-s
550    o pkg/grdchk
551      - renamed 'ph-grd 3' to 'grad-res'
552      - merged from ecco-branch
553        (remaining bug fixes for obcs gradient checks)
554      - additional high-precision output for testreport
555        (grep for 'precision_grdchk_result')
556    
557    checkpoint51r_post
558    o cleaned up or removed CPP_OPTIONS.h files
559    o updated results for some of the tests to reflect the new
560      optfiles (-ieee: -O0 instead of -O3)
561    
562    checkpoint51q_post
563    o cd_code:
564      - moved cd_scheme.F -> cd_code_scheme.F
565      - separate read_checkpoint from cd_code_ini_vars.F
566      - separated cd_code part from write_checkpoint
567      - updated AD_SOURCE, generated .flow
568      - added CD_CODE_VARS.h to the_main_loop
569      - Moving cd_code specific store dir.s to pkg/cd_code
570    o ctrl package totally restructured
571      - pack/unpack now optional and decoupled from
572        xx_/adxx_ I/O
573      - ctrl_pack/unpack cleaned
574        (new routines ctrl_init_ctrlvar.F, pkg/ctrl/ctrl_init_wet.F)
575      - confined inclusion of AD_CONFIG.h to where necessary.
576    o genmake2: changed AD dependencies from SRCFILES to AD_FILES
577    
578    checkpoint51p_post
579    o create initial cd_code package
580      - WARNING: the initialization of fields within packages
581        is broken because INI_FIELDS (where READ_CHECKPOINT is
582        called) is called *before* PACKAGES_INIT_VARIABLES.
583        This seems to be backwards since
584        1) its important to initially zero the entire field including
585           the "halo" region
586        2) zeroing needs to be done *before* reading pickup info
587           and the pickup call might or might not happen in any
588           particular run
589      - this needs an overhaul for R2
590    o cleanup verification/*/code/GMREDI_OPTIONS.h
591    o cleanup testreport
592    
593    checkpoint51o_post
594    o bringing AD-related verif's up to date with genmake2
595      - carbon/
596      - global_ocean.90x40x15/
597      - hs.94.1x64x5/
598      - (front_relax/ )
599    o (more) consistent directory structure for AD-related verif.'s
600    o cleaning ALLOW_GRADIENT_CHECK -> ALLOW_GRDCHK
601    o cleaning some ALLOW_TANGENTLINEAR_RUN -> ALLOW_AUTODIFF
602    o bug fix in find_alpha.F for MDJWF:
603      - modif. to alpha = 1/D*( dN/dT - rho*dD/Dt) to account for
604        change rho -> rho-rhoConst
605      - replace call find_rho to find_rhonum
606    o initialisation of rFlx extended to full array (required by TAF)
607      and shifted to thermodynamics
608    o removed PTRACERS.h in ptracers routine
609    o added surfacetendencyPtr to S/R parameter list pracers_forcing
610    o Correcting initialisations for fVerU, fVerV.
611    o helping TAF to recognize dependency on kUp for
612      fVerU, fVerV
613    o Replacing delZ by delR in pkg/ctrl/
614    checkpoint51o_pre
615    
616    o undid all of cp51 pending some cleanups and discussion
617    o added the [#include "AD_CONFIG.h"] statement to all files that need
618       it for adjoint/tl #defines
619     o re-worked the build logic in genmake2 to support AD_CONFIG.h
620     o removed tools/genmake since it no longer works
621    
622    checkpoint51n_post
623    o modifications to make FREEZE flux visible to pkg/kpp
624      - moved surfaceTendencyTice from pkg/seaice to main code
625      - FREEZE & EXTERNAL_FORCING_SURF moved to FORWARD_STEP
626      - subroutine FREEZE now limits only surface temperature
627        (this means new output.txt for global_ocean.90x40x15,
628         global_ocean.cs32x15, and global_with_exf)
629    o added surface flux output variables to TIMEAVE_STATVARS
630    
631    checkpoint51n_pre
632    o added "#undef ALLOW_USE_MPI" support to eesupp/src/gather_2d.F
633    o added [#include "AD_CONFIG.h"] to all files that use the following
634      defines:
635      - ALLOW_ADJOINT_RUN
636      - ALLOW_TANGENTLINEAR_RUN
637      - ALLOW_ECCO_OPTIMIZATION
638    
639    checkpoint51m_post
640    o incorporating changes to get TAMC/TAF working in genmake2
641      - added new TAMC/TAF targets to the Makefile
642      - various cleanups related to package handling
643      - these changes should have no impact on the forward model
644    
645    checkpoint51l_post
646    o changes to pkg/cal and pkg/exf that allow and speed-up long integrations
647     - faster algorithm for cal_addtime.F
648     - higher precision arithmetic, where needed
649     - pkg/exf *startdate variables changed from calendar date to
650       model integration time
651    
652    checkpoint51l_pre
653    o add salt flux to forcing fields (used when salty sea-ice forms or melts)
654    o enable to apply restoring on S & T only in a latitude band.
655    o update output (external_forcing_surf modif. change truncation errors)
656       global_ocean.cs32x15, global_ocean_pressure, lab_sea, natl_box
657    
658    checkpoint51k_post
659    o change default to: useNHMTerms=.FALSE.
660     - new output.txt for atmos. exp (NHMTerms were wrong but now turned off):
661       adjustment.128x64x1, aim.5l_Eq_Ch, aim.5l_LatLon, hs94.128x64x5, hs94.1x64x5
662     - new output.txt for idealized oceanic exp (NHMTerms are now turned off):
663        exp1, ideal_2D_oce
664     - change data file of oceanic exp (leave the results unchanged for now)
665       exp2, global_ocean[90x40x15,pressure,with_exf], lab_sea, natl_box
666    o set gravitySign automatically according to the vertical coordinate used
667      (and change sign: back to "logical" value: +1 when R increases downward)
668    o added an include barrier to the default CPP_OPTIONS.h and
669      removed the #include "PACKAGES_CONFIG.h" from it
670    o fix a bug in mom_fluxform (from chk51j_post)
671    
672    checkpoint51j_post
673    o Added some AD-related initialisations in mom_vecinv/ mom_fluxform/
674    o adjusted some flow directives (dynamics, thermodynamics)
675    o added cubed-sphere case to test cost function
676    o heckpoint_lev?_directives.h now include
677      pkg-specific directives, whenever those are enabled.
678    o Moving pkg-specific flow directives to corresponding pkg
679      Moving pkg-specific differentiation list to corresponding pkg
680      Moving pkg-specific checkpoint-lev storing to corresponding pkg
681      ---> conventions are
682           - pkg_ad.flow
683           - pkg_ad_diff.list
684           - pkg_ad_check_lev?_dir.h
685    
686    checkpoint51i_post
687    o merge of the branch-genmake2
688      - knowingly breaks the older genmake
689      - automatic generation of all ALLOW_${PKG_NAME} defines
690      - new testreport supersedes older testscript
691    o large number of package inclusion and header cleanups
692    checkpoint51i_pre
693    
694    o new output for adjoin of global ocean vector invariant
695    o fix for checkpoint of thermodynamic seaice and bulk_force
696    o Steph gchem various cleanups
697    
698    checkpoint 51h_pre
699    o fixed some single quotes
700    o modify gchem pkg to be more versatile
701    o modifications to clean up dic pkg
702    o add pkg/cfc
703    
704    checkpoint51g_post
705    o provide links for ARPACK and ADM*TLM
706    o start removing verification/vero/
707    o update AD-related stuff
708      (in particular some IF-statements in model/src/ routines)
709    o adding to verification/global_ocean.90x40x15/ adjoint of
710      vector invariant setup
711    
712    checkpoint51f_post
713    o update advect_xz/output.txt (left from chekpoint50f_pre, ini_vel modif)
714    o Mods and bug fixes to pkg/cal, pkg/exf, etc., needed for computation
715      of tracer Green's fucntions for ocean inversion project.
716    
717    checkpoint51f_pre
718    o Added on-the-fly spatial interpolation capability
719        "USE_EXF_INTERPOLATION" to pkg/exf.
720      - This is a temporary Cartesian-grid hack until
721        the super-duper ESMF coupler becomes available.
722      - See verification/global_with_exf/README for usage example.
723      - Removed obsolete EXFwindOnBgrid and SEAICEwindOnCgrid
724        flags and modified pkg/seaice accordingly.
725    o Bug fix to pkg/ptracers, pkg/generic_advdiff/gad_calc_rhs.F,
726        and pkg/kpp/kpp_transport_ptr.F for dealing with tracer
727        non-local transport term.
728    
729    checkpoint51e_post
730    o pkg/mom_vecinv:
731      - changes related to hFac: use S/R from aim.5l_cs/code (coriolis & vort.advec)
732      - add time-ave diagnostic of vorticity advection.
733    o add diagnostic (instantaneous) of Shapiro Filter effect for T,S & UV.
734    o atmospheric geopotential: - include water vapor effect;
735                                - use p^kappa in p* scaling.
736    o land pkg: read initial state from files.
737    o AIM : add stratospheric drag in the upper level
738    
739    checkpoint51d_post
740    o change function ILNBLNK (=> last non-blank char.) to return zero
741      (instead of the string length) when the string. char is empty
742    o fix bug in dxV,dyU definition of cubed-sphere grid (ini_curvilinear_grid)
743    o modif's to restore TAMC compatibility
744      - avoid "_d" constructs in PARAMETER declarations
745      - avoid interrupting lines by comment lines
746    o Use cluster local disks for purely local I/O
747      vs. globally visible disks needed for ctrl stuff
748      (merged from ecco-branch)
749      - new active_file_loc... and mdsio_..._loc routines
750      - affected packages: autodiff, ctrl, grdchk, mdsio
751    
752    checkpoint51c_post
753    o introducing integer flag debugLevel
754      - debLevZero: suppress all output
755      - debLevA: standard
756      - debLevB: equivalent to current debugMode=.TRUE.
757    o introducing pathname variable mdsioLocalDir for mdsio
758      that can be specified at runtime
759      (relevant for cluster I/O to local disk)
760    `
761    >>>checkpoint51b_post
762    adjoint of ptracers
763    o disentangled ALLOW_PTRACERS using new ALLOW_GCHEM
764    o extended state in checkpoint_lev?, etc.
765    o alternative ctrl/cost with tr1 or ptracer
766    o new comlev1_bibj_ptracers
767    o new ptracers.flow
768    o made ptracers_forcing same as external_forcing_s
769    o added verification for adjoint with ptracers
770      - adm. grdchk fail so far
771      - tlm. grdchk OK
772      - checked tapelev/comlev recomputations: OK
773    <<<checkpoint51b_pre
774    
775    checkpoint51a_post
776    o added code for biogeochemistry package
777      - new pkgs: dic, gchem
778      - new subroutine in ptracers
779    o modify code for biogeo packages
780      - in model/src and pkg/ptracers
781    
782    checkpoint51
783    o merged improved packages from ecco-branch (ecco_c51_e34) to MAIN
784      - autodiff, ctrl, exf, grdchk, seaice
785      kept separate packages
786      - cost, ecco, obcs
787    o updating verification/internal_wave, verification/lab_sea
788      (all verif's pass on faulks.lcs.mit.edu RH7.3, g77)
789    
790    checkpoint50i_post
791    o Preparing next differentiable checkpoint and sync
792      of MAIN vs. ecco-branch
793      - 1st step: this one is differentiable
794      - 2nd step: next(! not this) checkpoint will have updated packages
795                  from ecco-branch)
796    
797    checkpoint50h_post
798    o new package "land": provide surface BC for AIM.
799    o pkg/ptracers: apply exchange to all tracers after reading a pickup.
800    o AIM: use true log-P extrapolation for near surface temp (= as in
801        F.Molteni paper) ; update aim.5l_cs output.
802    o New variable in PARM03 for more flexible pickups
803    o somewhat cleaned package initialisation sequence for
804      ctrl/ cost/ ecco/ in packages_... routines
805    
806    checkpoint50g_post
807    o merged with release1_p17 (pkg/seaice and verification/lab_sea)
808      - added SEAICE_MULTILEVEL for 8-category sea-ice thermodynamics
809      - LSR sea-ice dynamic solver moved to SouthWest B-grid location and
810        made the default because of faster convergence than ADI
811    
812    checkpoint50f_post
813    o exf totally restructured
814      - replaced all exf_set_ routines by one generic exf_set_gen.F
815        and made sure it's still differentiable
816      - split exf_getffields.F into new exf_bulkformulae.F
817      - exf_inscal_/exf_outscal_ suffixes consistent with field names
818      - updated adjoint/makefile and relevant verif. accordingly
819    
820    checkpoint50f_pre
821     o AIM: near surface temp evaluated from Pot.Temp: fixed for Part Cell ;
822          + change Evap over land. (update aim.5l_cs output)
823     o added missing .cvsignores and made uniform across expts
824     o changed configuration of tidal_basin_2d expt
825     o added pkg/debug functions for tracing code in fatal crashes
826     o tidied pkg/monitor to use MONITOR_OPTIONS.h
827     o new fn in pkg/monitor to stop model if solution grows too big
828     o removed lots of single quotes from comments
829    
830    checkpoint50e_post
831    o make KPP work with PTRACERS
832     - fix gad_calc_rhs to call new routine kpp_transport_ptr, which is
833       nearly a copy of kpp_transport_s
834     - there is no analogue to SurfaceTendencyS, so I have to use
835       gPtr(of the surface layer) instead
836    o add a new platform SunFire+mpi (SunFire 15000) to genmake
837    checkpoint50e_pre
838    
839    checkpoint50d_post
840    o change kpp output from multiple-record state files to single-record state
841      files analogous to write_state.F
842    o reduce the output frequency of cg3d-related stuff to the monitor frequency,
843      analogous to the cg2d-related output.
844    o fix small problem with in ptracers_write_checkpoint.F: len(suff)=512,
845      so that writing to internal file fn (with length 512) fails.
846    checkpoint50d_pre
847    
848    checkpoint50c_post
849    o fix problem in ini_procs.F when using MPI (was there since checkpoint48f)
850    o add monitor diagnostic of vorticity (mon_vort3.F) and potential energy.
851    o add time-average diagnostic of U*V and vertical diffusive flux for theta.
852    o bug fixed in convective adjustment diagnostic (multi-tile set-up).
853    o 4th Order Adv scheme: return to previous (c40pre7) masking near boundaries.
854    
855    checkpoint50c_pre
856    Merging from release1_p13:
857    o bug fix for pkg/seaice dynamic solver
858    o Added SEAICE_initialHEFF to pkg/seaice
859    
860    checkpoint50b_post
861    o store u*,v* in gU,V instead of in guNm1,gvNm1
862    o in order to put the momForcing out of the Adams-Bashforth:
863      move forcing & CD-scheme calls from mom_fluxform & mom_vecinv
864      to timestep.F
865    o new flag "useCDscheme" (default=F); replace guCD,gvCD by local arrays
866    o re-generate output for highly sensitive test-exp:
867       global_ocean_pressure, ideal_2D_oce, lab_sea, natl_box
868    
869    checkpoint50b_pre
870    o restore the use of momAdvection & useCoriolis flags (mom_vecinv)
871    o corrected CPP option mismatch in exf_Bulk... functions for case
872      #define ALLOW_ATM_WIND && #undef ALLOW_ATM_TEMP
873    
874    checkpoint50a_post
875    o Bug fix for merging between c50 and KPP.
876      ikey was passed from thermodynamics to kpp_calc via
877      common block rather than being recomputed in kpp_calc,
878      in contradiction with new key itdkey.
879      New key ikppkey created, and tamc.h headers updated.
880    
881    checkpoint50
882    - 2nd step of merge with ecco-branch:
883      merge changes in ecco-branch back into main trunk
884    - bug fix in find_alpha
885    - more storing in gmredi_calc_tensor.F, kpp_routines.F
886    - avoid iterative loop in ini_pressure for ALLOW_AUTODIFF_TAMC
887    - merged some sliced AD support routines
888    
889    checkpoint49
890    merged from ecco-branch:
891    o exf:
892      - Enable initialisation of forcing fields to constant
893        (runtime) values.
894      - in exf_getffields.F
895        Reduce i-/j-loop to interior domain, discarding overlaps.
896        That also fixes wrong TAF-key computations for key_1, key_2
897        with bulf formulae.
898      - exf_init.F modify #ifdef for exf_init_evap
899      - exf_getffieldrec.F, ctrl_getrec.F
900        The following INT-usages are not safe:
901          fldsecs  = int(fldsecs/fldperiod)*fldperiod
902          fldcount = int(fldsecs/fldperiod) + 1
903        and were modified.
904    o autodiff: checkpoint_lev...
905      - updated storing for bulk formulae (some arrays were missing)
906      - added state for seaice package
907      - synchronized with main branch
908    o DIVA:
909      Modif.s in
910      - the_main_loop.F
911      - the_model_main.F
912      and added cost_final_restore.F cost_final_store.F
913      o With these changes, it is possible to fully separate
914        the first forward run to compute the cost function (mdthe_main_loop)
915        and adjoint runs over individual DIVA intervals (adthe_main_loop)
916        into separate model executions.
917        This enables better tuning of DIVA to given queue sizes.
918      o Loss of cost function value in consecutive DIVA runs is
919        fixed by storing to 'costfinal' file.
920      o Appropriate call of ctrl_unpack/_pack,grdchk_main at
921        beginning/end of adjoint integration is accounted for.
922      The current changes apply to TAF-1.4.26.
923      TAF has one remaining bug, requiring one manual change
924      (see MITgcm manual).
925    o cal: synchronized between MAIN and ecco-branch
926    
927    checkpoint48i_post
928    o Changes to restore differentiability of code w.r.t. previous tag
929      (mostly adding new routines to make list and replacing
930      pressure by totPhiHyd).
931    o Updated and merged grdchk package
932      - has both ADM and TLM checks
933      - works for single- and multi-proc.
934      - output cleaned
935      - worked successfully for parallel DIVA
936    o genmake:
937      - Adding -platform=SP4
938      - Modif. for DEC Alpha (many don't have makedepend; use mkdep instead).
939    o Modif. for DIVA:
940      ctrl_unpack should not be called in intermediate DIVA interval.
941      (similar thing would apply for active files such as
942      tbar, sbar, psbar, which should not be reinitialised;
943      only relevant for ecco-branch)
944    
945    checkpoint48h_post
946    o improve "ini_p_ground" when using finite difference form for calc_phi_hyd
947    o Added net flux to downward flux conversion to pkg/exf/exf_getffields.F
948    o Added SEAICE_initialHEFF to pkg/seaice
949    o ecco_the_model_main.F: SEAICE_WRITE_PICKUP must precede WRITE_CHECKPOINT
950    
951    checkpoint48g_post
952    --- EOS:
953    o compute locally the pressure for use in EOS: UNESCO, JMD95P, MDJWF
954      store total Potential in totPhyHyd for diagnostics & EOS.
955    o fix restart and overlap Pb when using Z-coord and EOS funct. of P
956    --- Pressure/geopotential gradient:
957    o use Ro_surf & R_low instead of hFac in cal_phi_hyd:
958    o NLFS + p-coord.: eta*Alpha' is not longer lagging 1.time-step behind
959      ( changes results of global_ocean_pressure )
960    o NLFS + z-coord.: add eta*Rho' contribution.
961    o accurate phiHyd when using interface-W at the middle between 2 centers
962     ( changes results of ideal_2D_oce )
963    o includes r* 2nd term in potential gradient.
964    
965    checkpoint48f_post
966    Merging from release1_p12:
967    o Modifications for using pkg/exf with pkg/seaice
968      - improved description of the various forcing configurations
969      - added basic radiation bulk formulae to pkg/exf
970      - units/sign fix for evap computation in exf_getffields.F
971      - updated verification/global_with_exf/results/output.txt
972    o Added pkg/sbo for computing IERS Special Bureau for the Oceans
973      (SBO) core products, including oceanic mass, center-of-mass,
974      angular, and bottom pressure (see pkg/sbo/README.sbo).
975    o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
976      to avoid negative values in shallow regions.
977      - updated verification/natl_box/results/output.txt
978      - updated verification/lab_sea/results/output.txt
979    o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
980    o Added useSingleCpuIO option (see PARAMS.h).
981    o Updated useSingleCpuIO option in mdsio_writefield.F to
982      work with multi-field files, e.g., for single-file pickup.
983    o pkg/seaice:
984      - bug fix in growth.F: QNET for no shortwave case
985      - added HeffFile for specifying initial sea-ice thickness
986      - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
987    o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
988      kpp_transport_t.F, forward_step.F, and the_main_loop.F
989    o pkg/seaice:
990      - adjoint-friendly modifications
991      - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
992    
993    checkpoint48e_post
994    o New S/R for diagnostic of bottom pressure (phi0surf was missing in c48d_post)
995    o dynamics: change definition of computational domain & adapt mom_fluxform
996      accordingly ; when viscA4=0, allows to run the dynamics with Olx=Oly=2.
997    o following exp works with Olx=Oly=2 (and pass through checkbounds option):
998        adjust_nlfs.cs-32x32x1 adjustment.128x64x1 adjustment.cs-32x32x1
999        exp0 exp1 exp2 exp4 exp5 hs94.cs-32x32x5 hs94.128x64x5 hs94.1x64x5
1000        global_ocean.90x40x15 global_with_exf global_ocean_pressure
1001        inverted_barometer solid-body.cs-32x32x1
1002      (high order AdvScheme and/or multiDimAd works with Olx=Oly=2 ? not sure)
1003    
1004    checkpoint48d_post
1005    o in preparation for r*:
1006     a) use pre-computed gradient of hydrostatic potential:
1007        changes in timestep.F & mom_cdscheme.F affects results of ideal_2D_oce
1008     b) move phi0surf from calc_phi_hyd to calc_grad_phi_hyd:
1009        => affects results of glob_oce_pressure (different truncation error)  
1010      update output.txt of ideal_2D_oce & global_ocean_pressure
1011    
1012    checkpoint48d_pre
1013    o in preparation for r*:
1014      new S/R (calc_grad_phi_hyd.F) to compute Hydrostatic potential gradient.
1015      pass the 2 comp. of the grad. as arguments to momentum S/R.
1016      but for the moment, only used if it does not change the results.
1017    o add finite volume form of calc_phi_hyd for buoyancyRelation OCEANIC & OCEANICP
1018    
1019    checkpoint48c_post
1020    Modifications in treatment of initial flux forcing controls
1021    to avoid extra storing of flux fields.
1022    
1023    checkpoint48c_pre
1024    o Added tidal_basin_2d experiment (currently 1D!)
1025    o can use r* Coordinate with OBC (but Orlanski Rad. BC not yet implemented)
1026    
1027    checkpoint48b_post
1028    o r* coordinate added in #ifdef NONLIN_FRSURF block.
1029     (modification to pressure gradient not yet implemented)
1030    o mom_fluxform: new S/R mom_calc_rtrans.F computes vertical transports
1031      (for U & V) that are used for vertical advection of momentum.
1032    
1033    checkpoint48a_post
1034    o In preparation for r*, use temp. array to compute vertical transport
1035       in flux-form momentum pkg. => change results of few test-exp.
1036      Update output of: exp4, exp5, front_relax, global_ocean_pressure,
1037                        lab_sea, natl_box & plume_on_slope
1038    
1039    checkpoint48
1040    o fix small bug that was causing lot of warning (TIMER_STOP 'UPDATE_CG2D')
1041    
1042    checkpoint47j_post
1043    o add new exp. (ideal_2D_oce) to test "exotic" parameters and options.
1044    o moved adexch from forward_step to addummy_in_stepping
1045    o added exch in ctrl_map_...
1046    o aveFreq.=0. at end of cost_final to avoid overwrite in
1047      reverse checkpointing loop
1048    o Yet more changes in gmredi:
1049      * adgmredi_calc_tensor
1050        avoiding all recomputation of gmredi_slope_limit
1051      * adgmredi_x/y/rtransport
1052        added flag for excessive storing to avoid recomp. of
1053        u/v/rtans, dTdx/y/z
1054        -> this is not really necessary and very memory-consuming
1055      * adgmredi_slope_psi:
1056        consistency with gmredi_slope_limit in treatment of GM_slopeSqCutoff
1057      * gmredi_slope_limit
1058        re-activated full calculation of taperfct for case 'ac02'
1059    o updating verification/ adjoints of carbon, global_ocean.90x40x15
1060    
1061    checkpoint47i_post
1062    o GM_EXCLUDE_() replace GM_TAPER_(): by default, all the code is compiled.
1063    o add GM_Small_Number & GM_slopeSqCutoff as run-time parameters (data.gmredi)
1064      default values = 1.D-12 & 1.D+48 (=> give same results as checkpoint47f_post)
1065    o cg2dTargetResWunit: define tolerance using deltaTmom (and not deltaTfreesurf)
1066    o gmredi: fix few bugs.
1067    
1068    checkpoint47h_post (duplicate tag for PH's c48 tag, in order to move c48)
1069    This will be a good checkpoint to plug into the ecco-branch.
1070    o few modif.'s to get latest version adjointed
1071      (mainly kick out code in ini_linear_phisurf)
1072    o modif's to run adjoint with exactConserv
1073    o case GM_BOLUS_ADVEC should be cleaned
1074      S/R gmredi_slope_psi should be cleaned
1075    o verification/carbon now has exactConserv=.TRUE.
1076    
1077    checkpoint47g_post
1078    o time-average AIM output: becomes independent from statvars time-average
1079      (can be used with #undef ALLOW_TIMEAVE) ; add new variables (e.g., RH)
1080    o After TAF bug fix:
1081      Tested adjoint of gmredi package.
1082      Tests were done with checkpoint47 rather than with latest
1083      checkpoint47f_post since the latter is broken for the adjoint
1084      verification/carbon/ contains both ADM and TLM gradient checks.
1085    Here they are, before they get changed/lost/stolen.
1086    Mostly modif.'s to fix numerical sensitivities.
1087    Gradient checks OK for
1088    - GM_taper_scheme:
1089      * clipping
1090      * ac02
1091      * linear
1092      * glw91
1093      * dm95
1094      * ldd97
1095    - GMREDI_OPTIONS:
1096      * GM_VISBECK_VARIABLE_K
1097      * GM_NON_UNITY_DIAGONAL
1098      * GM_EXTRA_DIAGONAL
1099      * GM_BOLUS_ADVEC
1100    in conjunction with data.gmredi parameters to be checked in
1101    in a few minutes under verification/carbon/code/
1102    
1103    checkpoint47f_post
1104    Merging from release1_p10:
1105    o modifications for using pkg/exf with pkg/seaice
1106      - pkg/seaice CPP options SEAICE_EXTERNAL_FORCING
1107        and SEAICE_EXTERNAL_FLUXES
1108      - pkg/exf CPP options EXF_READ_EVAP and
1109        EXF_NO_BULK_COMPUTATIONS
1110      - usage examples are Experiments 8 and 9 in
1111        verification/lab_sea/README
1112      - verification/lab_sea default experiment now uses
1113        pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf
1114    
1115    checkpoint47e_post
1116    o created a tag prior to creating a branch
1117    
1118    checkpoint47d_post
1119    o fixed bug in the oceanic pressure coordinates code: vertical viscosity
1120      at the bottom boundary had an erroneous half slip boundary condition
1121    o added bottom drag and no slip boundary condition capabilities to
1122      oceanic pressure coordinates code
1123    o added new verification experiment global_ocean_pressure, this experiment is
1124      also described in the tutorial section of the manual
1125    checkpoint47d_pre
1126    
1127    checkpoint47c_post
1128    o Added a verification experiment for a global cubed-sphere ocean run
1129      -  verification/global_ocean.cubed32x32x30
1130      -  uses pkg/therm_seaice and pkg/bulk_forcing
1131    
1132    o allow to run AIM physics with SPEEDY input files (from Franco Molteni)
1133    o allow a more accurate definition of Ro_Surf (selectFindRoSurf=1)
1134      when using P-coordinate; only implemented for atmospheric config.
1135    o OCEANICP & realFreshWater: include P-E direct effect on wVel ;
1136      NOTES: requires option NONLIN_FRSURF to be "#define".
1137    o update advect_xz/results/output.txt (left from checkpoint44g_post)
1138    
1139    checkpoint47b_post
1140    Merging from release1_p9:
1141    o pkg/seaice
1142      - removed GOTO's and added taf directives
1143      - double precision constants to reduce the g77 (Linux)
1144        to F77 (SGI) differences reported in release1_p8
1145    o tools/genmake
1146      - added SGI options
1147    o verification/testscript
1148      - updated to that of checkpoint47a_post
1149    o verification/global_ocean.90x40x15/input/eedata
1150      - modified for SGI f77 compatibility
1151    o verification/lab_sea
1152      - added description of sea-ice model
1153      - added missing matlab routines
1154      - added test of thermodynamics parallelization
1155    
1156    checkpoint47a_post
1157    o new pkg: aim_v23
1158     = F. Molteni atmos.physics (SPEEDY, ver23) adapted to MITgcm.
1159       for now, keep the same surface forcing as before.
1160     - Part-Cell implemented into AIM; check that Heat & Water are conserved
1161     - aim.5l_cs: use new aim pkg (run 10yr & get better results than before)
1162     - aim.5l_LatLon & aim.5l_Equatorial_Channel are still using old aim pkg
1163    o add diagnostic of surface correction term in monitor output
1164    
1165    o bulk_force and therm_seaice
1166    - Two packages:  bulk_force (Bulk forcing)
1167      and therm_seaice (thermodynamic_seaice) - adopted from LANL CICE.v2.0.2
1168    - Earlier integration from Stephaine Dutkiewicz
1169      and Patrick Heimbach.
1170    - Two ifdef statements for compile time,
1171       ALLOW_THERM_SEAICE and ALLOW_BULK_FORCE
1172    
1173    checkpoint47
1174    differentiable version of checkpoint46n_post
1175    o bug fix in quasihydrostaticterms
1176    o * "clean" adjoint code (in terms of extensive recomputations)
1177        can now be obtained for all GMREDI options (i.e. for
1178        - GM_VISBECK_VARIABLE_K
1179        - GM_NON_UNITY_DIAGONAL
1180        - GM_EXTRA_DIAGONAL
1181        - GM_BOLUS_ADVEC )
1182      * However, wrong gradient check problem remains unsolved.
1183      * New CPP options have been introduced for different
1184        tapering schemes
1185    o external_fields_load now part of differentiation list
1186    o pressure needs multiple storing;
1187      would be nice to have store_pressure at beginning or
1188      end of forward_step, e.g. by having phiHyd global (5-dim.)
1189      (NB: pressure is needed for certain cases in find_rho,
1190      which is also invoked through convective_adjustment).
1191    o recomputations in find_rho for cases
1192     'JMD95'/'UNESCO' or 'MDJWF' are OK.
1193    o #define ATMOSPHERIC_LOADING should be differentiable
1194    o ini_forcing shifted to begining of initialise_varia
1195    o Incorporating QNVS line search routines into MITgcm
1196      (this is separate code, and therefore not under pkg)
1197      lsopt/, optim/
1198    o Updated verification/carbon/
1199      - #define GM_VISBECK_VARIABLE_K
1200      - GM_taper_scheme    = 'ldd97'    
1201    
1202    checkpoint46n_post
1203    Merging from release1_p8:
1204    o verification/natl_box:
1205      updating new external_fields_load routine
1206    o New package: pkg/seaice
1207      Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
1208      The sea-ice code is based on Hibler (1979-1980).
1209      Two sea-ice dynamic solvers, ADI and LSR, are included.
1210      In addition to computing prognostic sea-ice variables and diagnosing
1211      the forcing/external data fields that drive the ocean model,
1212      SEAICE_MODEL also sets theta to the freezing point under sea-ice.
1213      The implied surface heat flux is then stored in variable
1214      surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
1215      kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
1216      non-local transport term.  Because this call precedes model
1217      thermodynamics, temperature under sea-ice may not be "exactly" at
1218      the freezing point by the time theta is dumped or time-averaged.
1219      N.B.: fairly large differences in accuracy occur across
1220            different platforms/compilers; comparison between
1221            g77 (Linux) and F77 (SGI Origin 2000/MIPSpro)
1222            generated output gives:
1223       T           S           U           V
1224      C D M    c        m  s        m  s        m  s        m  s
1225      n p a R  g  m  m  e  .  m  m  e  .  m  m  e  .  m  m  e  .
1226      f n k u  2  i  a  a  d  i  a  a  d  i  a  a  d  i  a  a  d
1227      g d e n  d  n  x  n  .  n  x  n  .  n  x  n  .  n  x  n  .
1228    
1229      Y Y Y Y  5  5  7  7  7  8 10  9  6  6  6  6  7  5  7  5  7 FAIL  lab_sea
1230    o GAD:
1231      - generated new common blocks to account for call of
1232        same gad routines with differing traceridentities
1233        (needed to modify tracerIdentity indices in GAD.h)
1234      - generated separate common blocks for case useCubedSphereExchange
1235        (Department of Futurology)
1236      - parameter lists to gmredi_?transport: added tracerIdentity
1237      - added new key indices to tamc.h
1238    o external_fields_load:
1239      - added this routine to TAF list
1240      - needed to make some common blocks global and additional storing
1241        along the same lines as exf package (checkpoint_lev?_directives.h)
1242    o exf:
1243      updated external forcing package
1244      - bug fixes carried over from ecco-branch
1245        (missing OBCS_OPTIONS.h in two routines)
1246      - enable easy to use "no forcing".
1247      - added exf I/O for atmospheric loading
1248      - added exf I/O for runoff data
1249      - transfered scaling between exf <-> MITgcm to exf namelist
1250    o Adding new verification experiment global_with_exf.
1251      This verification experiment is almost identical to the
1252      global_ocean.90x40x15 experiment, except that it uses
1253      the exf (and cal) package instead of the
1254      external_fields_load routine (cf README file).
1255    
1256    checkpoint46m_post
1257    o modified testscript to return -- when there are no lines of "%MON" output
1258    o added new flag "quasiHydrostatic" for QH mode
1259      and new routine quasihydrostaticterms()
1260    o added 2*Omega*Cos(phi)*W to u equations (non-hydrostatic Coriolis term)
1261      New routine: mom_u_coriolis_nh()
1262    o fixed sign of non-hydrostatic metric terms in u and v equations.
1263      Depend on correct sign of gravitySign.
1264    o added work.pc* to .cvsignore in aim directories using ifc
1265    o introduced flag for controllin non-hydrostatic metric terms
1266    o removed gravitySign from PARM04
1267    o switched to g77/ifc from pgf77 in aim experiments
1268    
1269    checkpoint46l_post
1270    o made convective adjustment work with pressure coordinates:
1271     - changed the direction of k-loop in convective_adjustment.F for the
1272       case of pressure coordinates (OCEANICP,ATMOSPHERIC buoyancyRelation)
1273     - adjusted the reference pressure k-index in convective_adjustment.F
1274     - adjusted the convection condition in convect.F (in analogy to
1275       calc_ivdc.F)
1276     - convective_adjustment no longer computes anything on the halos
1277     - removed the warnings about negative salinity from find_rho.F and
1278       find_alpha.F; instead the new routine look_for_neg_salinity, called
1279       at the beginning of find_rho, find_alpha, and find_beta, does a
1280       check of the entire slice, if CPP-option
1281       CHECK_SALINITY_FOR_NEGATIVE_VALUES is defined
1282    checkpoint46l_pre
1283    
1284    checkpoint46k_post
1285    o fixed the verification/global_ocean.90x40x15 experiment:
1286     - new bathymetry (the world according to A., JMC, and M.)
1287     - new initial fields and forcing fields (*.bin files)
1288     - new POLY3.COEFFS (for the next release one should switch to a full
1289       equation of state: JMD95P or MDJWF)
1290     - fixed several errors and redundancies in the data file
1291     - experiment uses looped cells
1292     - added matlab directory with diagnostic scripts for plotting of output
1293    
1294    o S/R aim_initialise.F replace S/R aim_init from file aim_do_inphys.F:
1295     - read AIM physics parameters from a file (data.aimphys)
1296     - set defaults values = F.Molteni paper (Clim.Dyn., 2002)
1297    
1298    checkpoint46j_post
1299    o split calc_exact_eta in 2 S/R : integr_continuity & update_etaH
1300    o move wVel computation at the end of the time step, in S/R integr_continuity
1301    o create specific S/R to exchange T,S before DYNAMICS (for stagger time step)
1302    o update timeave pkg for wVel diagnostic.
1303    checkpoint46j_pre
1304    
1305    checkpoint46i_post
1306    o Clean up AIM package (and keep the results unchanged):
1307      include CPP_OPTION and use IMPLICT NONE in all routines ;
1308      declare all the variables _RL ; use _d 0 for all numerical constants.
1309      use ifdef ALLOW_AIM everywhere. And now AIM can be used with g77 !
1310    
1311    checkpoint46h_post
1312    o cleaned up the use of rhoNil and rhoConst.
1313      - rhoNil should only appear in the LINEAR equation of state, everywhere
1314        else rhoNil is replaced by rhoConst, e.g. find_rho computes rho-rhoConst
1315        and the dynamical equations are all divided by rhoConst
1316    o introduced new parameter rhoConstFresh, a reference density of fresh
1317      water, to remove the fresh water flux's dependence on rhoNil. The default
1318      value is 999.8 kg/m^3
1319    o cleanup up external_forcing.F and external_forcing_surf.F
1320      - can now be used by both OCEANIC and OCEANICP
1321    checkpoint46h_pre
1322    
1323     Added code to convert surface volume flux (fresh water) into
1324     a mass flux when using P coordinates in the ocean (OCEANICP).
1325     Note: It assumes you have set rho0=rhoConst=density of fresh water.
1326    
1327    checkpoint46g_post
1328    o Include a new diagnostic variable phiHydLow for the ocean model
1329      - in z-coordinates, it is the bottom pressure anomaly
1330      - in p-coordinates, it is the sea surface elevation
1331      - in both cases, these variable have global drift, reflecting the mass
1332        drift in z-coordinates and the volume drift in p-coordinates
1333      - included time averaging for phiHydLow, be aware of the drift!
1334    o depth-dependent computation of Bo_surf for pressure coordinates
1335      in the ocean (buoyancyRelation='OCEANICP')
1336      - requires a new routine (FIND_RHO_SCALAR) to compute density with only
1337        Theta, Salinity, and Pressure in the parameter list. This routine is
1338        presently contained in find_rho.F. This routine does not give the
1339        correct density for 'POLY3', which would be a z-dependent reference
1340        density.
1341    o cleaned up find_rho
1342      - removed obsolete 'eqn' from the parameter list.
1343    o added two new verification experiments: gop and goz
1344      (4x4 degree global ocean, 15 layers in pressure and height coordinates)
1345    checkpoint46g_pre
1346    
1347    checkpoint46f_post
1348    o Enable tangent linear (forward mode) gradient checks:
1349      - extended active file handling to g_... files
1350      - added TANGENT_SIMULATION to theSimulationMode
1351      - extended grdchk package accordingly
1352    o added tangent linear setup in verification/carbon/code_ftl
1353    o added adjoint setup in verification/front_relax/code_ad
1354    
1355    checkpoint46e_post
1356    o Added new equation of state -> MDJWF
1357      - EOS of McDougall et al., 2002, JAOT, submitted
1358      - caveat: the equation of state is only valid for a smaller (more
1359        realistic?) range of values than JMD95P/Z and UNESCO
1360      - added masks to the calculation of pressure in store_pressure
1361      - added more check values for density in check_eos (ini_eos.F), some of
1362        the old check values are out of the range of the MDJWF-eos, so don't
1363        expect perfect matches for those
1364    checkpoint46e_pre
1365    
1366    checkpoint46d_post
1367    o fixed store_pressure to work with both buoyancy relation = 'OCEANIC' and
1368      'OCEANICP', also initialised field pressure correctly in ini_eos in the
1369      case of pressure coordinates. eosType='JMD95Z' in
1370      combination with buoyancyRelation='OCEANICP' now causes an error.
1371    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1372      in find_alpha/beta.
1373    checkpoint46d_pre
1374    
1375    o Changed p = pressure(i,j,k,bi,bj)  to  p = pressure(i,j,kRef,bi,bj)
1376      so that JMD95Z and JMD95P give approptiate static stability in find_rho.
1377    
1378    checkpoint46c_post
1379    o Changes necessary for ocean in p-coordinates
1380     -  Added new buoyancy relation = 'OCEANICP'
1381     -  Added new parameters = gravitySign (this used to be contained inside
1382        the factor dRdZ which I added when we first switched to R coordinates).
1383     X GM/Redi is not compatible (yet)
1384     X bottom drag and no-slip need to be debugged.
1385    checkpoint46c_pre
1386    
1387    checkpoint46b_post
1388    o Added new equation of state -> JMD95Z and JMD95P
1389      - EOS of Jackett and McDougall, 1995, JAOT
1390      - moved all EOS parameters into EOS.h
1391      - new routines ini_eos.F, store_pressure.F
1392    o Added UNESCO EOS, but not recommended because it requires
1393      in-situ temperature (see JMD95)
1394    o Modified formatting for knudsen2.f in utils/knudsen2 and added
1395      unesco.f to be used with POLY3
1396    checkpoint46b_pre
1397    
1398    checkpoint46a_post
1399    o Added (atmospheric) pressure loading
1400      - new field in FFIELDS.h, etc...
1401      - new cpp flag ATMOSPHERIC_LOADING
1402    o Changed hFacC to _hFacC in calc_phi_hyd.F
1403    o Added SHORTWAVE_HEATING to some files for consistency
1404    checkpoint46a_pre
1405    
1406    checkpoint46
1407    further merges from release1_p5
1408    o new ctrl package
1409      - adopted from ECCO environment to enable optimization
1410      - added Eliassen Palm fluxes to controls
1411    o added Eliassen Palm flux controls to gradient check package
1412    o cost package
1413      - Compatible with new ctrl package
1414      - added Eliassen Palm cost hooks
1415      - modif's of existing cost functions
1416    o Adjoint-related bug fixes in kpp:
1417      - kpp_calc: sore of kpphbl avoids recomputation/call to S/R kppmix
1418      - kpp_routines: store of Rib avoids partial recomputation bug of TAF.
1419    o autodiff package
1420      - flow directives:
1421        + new for S/R do_the_model_io
1422        + enhanced for S/R checkpoint
1423        + new gmredi.flow
1424      - Introduced CPP option ALLOW_AUTODIFF_MONITOR to
1425        disable adcommon.h/g_common.h by default.
1426      - fixed problem for adjoint of global_max
1427    o modified verification/carbon/
1428    o New setup for adjoint of global_ocean
1429    o added hooks for Eliassen Palm fluxes (dynamics.F, ini_fields.F)
1430    o cleaned TAF keys iikey, idkey (dynamics.F, thermodynamics.F)
1431    o incorporated hooks for sponge layer code (external_forcing.F)
1432    
1433    checkpoint45d_post
1434    o import 2 fixes from release1_p5 (CG2D.h & packages_readparms.F)
1435    o use recip_dx*,recip_dy* instead of /dx*,/dy* in orlanski_E,W,N,S
1436      (affects plume_on_slope "cg2d" output)
1437    o add new parameter deltaTfreesurf for free-surface time stepping
1438    o exchange gT,gS when using staggerTimeStep & GM & Oly<4
1439    o NONLIN_FRSURF: rescale gNm1 to get a better conservation with A-B
1440    o change phiMin in exp1 (to agree with documentation)
1441    o add new flags:
1442     - T,S forcing inside/outside Adams-Bashforth
1443     - turn off temp,salt advection and/or forcing
1444     - for each tracer, define internal flag for multiDimAdvection & A-B
1445    o monitor: change definition of KE to check conservation of Energy
1446    
1447    checkpoint45c_post
1448    o Removed f90 comments ("!")
1449    o Modified initialisations to enable exf package for MITgcm
1450      (without invoking ECCO_PACKAGE).
1451    o modifications to gradient check package (Martin Losch)
1452      - enable centered differences
1453      - modified format of standard output
1454    
1455    checkpoint45b_post
1456    o cleaned exchange calls in cg2d
1457    o Included CPP option ALLOW_AUTODIFF_MONITOR in forward_step
1458    o included CPP option SINGLE_LAYER_MODE in thermodynamics
1459      to configure barotropic setup (Martin Losch)
1460    o moved some initialisations within bi,bj loop in dynamics
1461      (TAF flow dependency)
1462    o in initialise_varia, moved call packages_init_variables
1463      before convective_adjustment_init
1464      (corresponding adjustment of TAF tape initialisation).
1465    o in calc_diffusivity/calc_viscosity extended domain to full overlap.
1466    
1467    checkpoint45a_post
1468    o compute Rho over the whole domain (extend iMin,jMin indices)
1469    o specific exchange for X-slice domain (case Ny=1)
1470    o argument futureIter of S/R obcs_calc missing in exp4 & internal_wave /code
1471    o solve_for_pressure : set cg2d_x to zero where OBCS are applied
1472    
1473    checkpoint44h_post = checkpoint45
1474    o Fix to restore differentiability:
1475      place at which packages_init_variables is called in
1476      initialise_varia is crucial for reverse control flow.
1477    o modifications in GMRedi to enable stable adjoint
1478      (corresponding modif's in thermodynamics, dynamics)
1479    o added missing hook for sponge layer code in external_forcing
1480    o modified test cost functions
1481    o storing in gad_advection (plus removal of write(0,*)!
1482    o missing headers TR1.h added in convective_adjustment routines
1483    o errorMessageUnit set non-equal zero in eeboot
1484      (conflict on some platforms, e.g. IBM SP3)
1485    o modified carbon verif.
1486    
1487    checkpoint44h_pre
1488    o vertical grid option: allow to put the Interface at the middle between
1489      2 cell-centers ; replace delZ in pkg/kpp by drF.
1490    o GM Advective form: Tracers are advected using the residual transport (=
1491      Euler+GM-bolus); set param GM_AdvSeparate=T to return to previous form.
1492    
1493    checkpoint44g_post
1494    o fix surface correction term in multiDimAdvection (affects plume_on_slope
1495      results) ; ifdef missing in thermodynamics.F
1496    
1497    checkpoint44f_pre,checkpoint44f_post
1498    o added PTRACERS package
1499      This allows an arbitrary number of passive tracers to be integrated
1500      forward simultaneously with the dynamicaly model.
1501      + Implemented so far:
1502        - basic forward algorithm (time-stepping, advection, diffusion, convection)
1503        - I/O and checkpointing
1504        - GM/Redi  *but*  using the GM/Redi coefficient of Salt
1505      + Not implemented so far:
1506        - KPP
1507        - OBCS
1508      + No specific example supplied (yet) but global_ocean.90x40x15 has the
1509        necessary data.ptracer file. Simply use -enable=ptracers and uncomment
1510        line in data.pkg.
1511      + This package is disabled by default since it increases storage.
1512    
1513    
1514    o testscript: added -cleanup option
1515    o Shap_filt: a) new shap_filt S/R to use no-slip BC with S2 filter
1516                 b) enable to filter 2D fields.
1517    
1518    checkpoint44e_pre,post
1519    o re-wrote convective adjustment to use pre-calculated weights
1520      Affects: model/src/convective_adjustment.F, convective_adjustment_ini.F
1521      Adds:    model/src/convective_weights.F, convectively_mixtracer.F
1522      Original calls to convect() still in place.
1523    
1524    chkpt44d_pre,post
1525    o added missing EXCLUDE_MONITOR flags
1526    o changed "e" to "_d" in gmredi_slope_limit, gmredi_slope_psi
1527      (incompatible typ in MIN/MAX expressions caused problems
1528      on IBM SP3)
1529    o in genmake added variable MAKEDEPEND
1530      plus resetting for case SunOS
1531    o added timer_stats.c routine for IBM SP3
1532    o removed variables in dynamics
1533    !!! I forgot to create tag chkpt44d_pre !!!
1534    !!! But chkpt44d_pre = chkpt44c_post    !!!
1535    
1536    o real fresh water flux implemented with non-linear free-surface.
1537    
1538    chkpt44c_pre,post
1539    o few fix (mask in shap_s2, EmPmR in external_field_load,
1540      USE_NATURAL_BCS in solve_for_P);
1541    o add arguments myIter & myTime to S/R obcs_calc & solve_for_P
1542    
1543    checkpoint44b_pre/_post
1544    o merge of relevant stuff from the ecco-branch:
1545      - genmake: removed $S64 overwrite for case SunOS
1546      - pkg/exf: update and corrections for field swapping and obcs
1547      - pkg/ecco: parameter lists for the_model_main, the_main_loop
1548                  harmonized between ECCO and MITgcm
1549      - pkg/autodiff: added flow directives for obcs, mdsio_gl_slice
1550                      updated checkpointing_lev... lists for obcs
1551      - model/src: minor changes in forward_step, plot_field
1552                   added directive for divided adjoint in the_main_loop
1553      - pkg/mdsio: added mdsio_gl_slice
1554    
1555    o check parameters & config (chkpt44a_pre,post)
1556    o OBC and NonLin_FrSurf.
1557    
1558    checkpoint44
1559    o fix bug in mom_vi_del2uv
1560    o select when filters are applied ; add options to zonal_filter (data.zonfilt)
1561    o gmredi: fix Pb in the adiabatic form ; add options (.e.g. Bolus advection)
1562    o update AIM experiments (NCEP input files)
1563    o improve and extend diagnostics (Monitor, TimeAve with NonLin-FrSurf)
1564    o added some stuff for AD
1565    
1566    checkpoint43
1567    o added two new advection tests
1568    o added global 4x4 degree ocean test
1569    o added test of H&S94 with free surface on cube
1570    o some final mods for gradient check, adjoint,...
1571    
1572    checkpoint42
1573      Fixed AD-related problems:
1574    o Store directives up-to-date with re-arranged Adams-Bashforth
1575      (mainly thermodynamics.F)
1576    o New store directives for multi-dim. advection schemes
1577      * new CPP flag ALLOW_MULTI_DIM_ADVECTION
1578      * new common block and key passkey
1579      (mainly gad_advection.F)
1580    o Modified store directives for split of dynamics/thermodynamics
1581      for the case ALLOW_KPP
1582    o Cleaned argument list for timestep_tracer.F
1583    
1584    checkpoint41
1585    o re-formatted/added comments in prologues of key subroutines
1586      to work with protex
1587    
1588    checkpoint40
1589    o moved calc_gs, calc_gt and calc_tr1 back to model/src
1590    o added FLT (floats) package from Arne along with demo. experiment
1591    o re-arranged Adams-Bashforth scheme for tracers to allow easier
1592      implementation of forward-in-time forcing terms
1593    o more mods for non-linear free-surface including new variable
1594    o modified multi-dim method to work on cube
1595    o bug fix in KPP (from DM)
1596    
1597    checkpoint40pre9
1598    o added DST advection schemes
1599    o fix MPI bug on SGI's
1600    o modifications for non-linear free-surface
1601    o fixed conditionals for fixed flow/passive tracer only mode
1602    o added tension/strain form of stress tensor
1603    o changes to commenting of arguments for TAF/TAMC
1604    o added/updated many matlab scripts
1605    o added multi-dimensional advection method for tracers
1606      
1607    checkpoint40pre8
1608    o new package rw/
1609      Added method for dumping intermediate local arrays:
1610      mdsio_writetile - same as mdsio_writefield except works from inside
1611                        bi,bj loop
1612      mdsio_writelocal - same as mdsio_writetile except works for local
1613                         arrays
1614      write_local_r? - higher-level wrapper for mdsio_writelocal
1615      Controlled by diagFreq. Defaults to zero (ie. no dumps)
1616      Example given at end of mom_vecinv.F that dumps some local arrays.
1617    o replaced calc_mom_rhs.F by mom_fluxform.F/mom_vecinc.F to
1618      control flux-form versus vector invariant code.
1619      Switch is runtime flag vectorInvariantMomentum (defaults to false)
1620      or genmake -DISABLE ...
1621    o TAMC-related update to cope with mom_fluxform.F/mom_vecinc.F
1622      (additional storing is now needed for case vecinv;
1623      currently nothing implemented to switch this storing off
1624      in case fluxform is used since no CPP flag available).
1625    
1626    checkpoint40pre7
1627    o bug fix in dynamics.F
1628      calc_viscosity called before k=1,Nr loop.
1629    o added some #ifdef's ALLOW_PASSIVE_TRACER
1630    o cleaned initialisations in ctrl_map_ini
1631      related to TAF
1632    
1633    checkpoint40pre6
1634    o split dynamics into thermodynamics & dynamics
1635    o corresponding split of calc_diffusivity into
1636      calc_diffusivity, calc_viscosity
1637      (kpp_calc_diff, kpp_calc_visc).
1638    o Added diffkr, kapgm to control variables
1639    o bug fix in gmredi_slope_limit for ldd97
1640    
1641    checkpoint40pre5
1642    o proper initialization of Adams-Bashforth time stepping
1643      + uses forward step for very first step of model (iter=0)
1644    o re-generated *all* output since almost all output is modified by this
1645      change (sorry but we've been putting this one off for about 2 years)
1646      + natl_box, aim.5l_Equatorial_Channel and aim.5l_zon-ave were
1647        *not* regenerated since they are already out of date and I don't
1648        want to create the impression that they are suddenly working.
1649    o removed KAP stuff for DEC's
1650    o modified/added many .cvsignore files in */code and */input
1651    o added new expt "solid-body.cs-32x32x1"
1652      + this uses an alternative form of ini_curvilinear_grid.F which
1653        is not necessarily any better than the current one...
1654    
1655    checkpoint40pre4
1656    o added re-initialisations of utrans,vtrans,rtrans in
1657      calc_common_factors which are crucial for TAF.
1658    o extended iMin,jMin range for calc_common_factors,
1659      calc_diffusivity
1660    o added option ALLOW_PASSIVE_TRACER
1661    o a few minor updates and fixes
1662    
1663    checkpoint40pre3
1664    o created calc_gtr1.F for gad package
1665    o split the_main_loop and re-introduced forward_step
1666    o some recomputations of nIter0 for TAMC
1667    
1668    checkpoint40pre2
1669    o Updated to latest branch of AJA, JMC
1670    o Added gradient check package
1671    o Added routines for passive tracer handling
1672    o Added carbon sequestration sensitivity experiment
1673    
1674    checkpoint39
1675     o Modifications and fixes to support TAMC
1676       (mainly missing or wrong directives)
1677     o Corrected common blocks when fooling TAMC to produce adjoint I/O
1678       in addummy_in_stepping
1679     o Updated verification/vero/ (bug fixes in code/, correct pickups in input/)
1680     o Enabled "sliced" (xz-,yz-) exchanges, needed for obcs.
1681     o Included following packages:
1682       cal: calendar
1683       exf: external forcing
1684       ecco: essential routines to control use of cal, exf
1685             (NB: this is not the full ECCO environment)
1686     o disabled some packages by default in genmake
1687    
1688    checkpoint38
1689     o see notes_c37_adj.txt
1690     o corrected wrong layer index in external_forcing_t
1691     o replaced the_main_loop/forward_step by the_main_loop
1692     o removed forceoutput from write_state
1693       (replaced criteria for initial/final state)
1694     o added runtime flag for pre-C35 pickups: usePickupBeforeC35
1695    
1696    checkpoint37
1697     o mdsio.F routine split and packaged in pkg/mdsio
1698       (mdsio.F and mdsio_gl.F still exist in eesupp/src but are not
1699        used unless genmake -disable=mdsio)
1700     o allow a more precise surface-geopotential gradient for the atmosphere
1701       taking into account the change in space of Alpha (=1/rho) at the surface.
1702     o variable "etaN" (replace cg2d_x) is the surface R-anomaly [r unit]
1703       (ocean: sea surface height [m] / atmos: surface pressure anomaly [Pa])
1704     o Change units: Phi_Hydrostatic (=phiHyd), Phi_Surface(=cg2d_x) and
1705       Phi_NonHydrostatic (=cg3d_x), all have now the dimension of a potential
1706       [m2/s2] (pressure/rhoConst in the ocean ; Geo-Potential in the atmosphere).
1707     o Time-Average diagnostics defined as a pseudo package "timeave".
1708     o pickup files : old pickup (before c35) did not work with new code (c35
1709       and after) unless activating 2 commented lines in initialise-varia.
1710     o Non-Hydrostatic pickup file Pb fixed.
1711     o bug with Rigid-lid version (since c35) fixed.  
1712    
1713    checkpoint36
1714     o implement Crank-Nickelson barotropic time-stepping
1715     o recover Time-Average diagnostics
1716     o fix Pb in checkpoint (PR#19)
1717     o AIM become a standard package ; clean unused CPP_kees
1718    
1719    checkpoint35
1720     o subtantial rewrite of dynamics.f
1721     o allows staggered time-stepping
1722     o packaged obcs, aim (Atmospheric Physics), zonal_filt, shap_filt
1723     o added bottom drag (linear + quadratic)
1724    
1725    checkpoint34
1726     o Modified exchange routines for correct reverse simulation.
1727     o Added verification output to comply with bug fix in impldiff.F
1728       as of c33 (exp2, natl_box).
1729     o Corrected store directives in dynamics.F
1730     o Corrected array boundaries in impldiff.F
1731     o Corrected array dimensions in gmredi.
1732       Added temporary scalars to avoid storage by TAMC (gmredi, kpp).
1733     o Added routine GLOBAL_SUM_INT to global_sum.F
1734     o Added mdsio_gl.F for ECCO purposes.
1735    
1736    checkpoint33
1737     o Fixed bug in lower BC in impldiff.F
1738     o Fixed confusion about units of forcing arrays in FFIELDS.h
1739       namely Fu,Fv,Qnet,Qsw,EmPmR:
1740       - Removed verification/natl_box/code/external_fields_scale.F
1741         (did not differ from that in model/src)
1742       - Changed units of fu,fv,Qnet,Qsw,EmPmR back to proper units
1743         (see FFIELDS.h for description)
1744       - Scale fu,fv,Qnet,Qsw,EmPmR when used in external_forcing_surf.F,
1745         kpp_calc.F and kpp_transport_t.F
1746       - Removed model/src/external_fields_scale.F and calls to it
1747       - verification/natl_box uses flux data with "atmospheric" sign so
1748         a special version of external_fields_load.F is used to
1749         change the data as it's read in. This way, the arrays
1750         have the right units and signs at all times tha a user could
1751         possibly use them.
1752     o Corrected genmake to delete a temporary file during configuration
1753    
1754    checkpoint32
1755     o Scaling of forcing fields moved from external_forcing.F to
1756       external_fields_scale.F, called directly after loading fields.
1757     o Surface relaxation terms added to surface tendency fields in
1758       extra subroutine.
1759     o impldiff.F changed to avoid storing by TAMC of huge intermediate
1760       fields.
1761     o Changes in GMRedi to comply with packaging structure.
1762     o Modifications and bug fixes in KPP package.
1763     o Verification experiment for KPP added (verification/nat_box/)
1764    
1765    checkpoint31
1766     o Packages interface brought in line with defined standard
1767       -> new routines packages_...F
1768       -> changes in initialise_fixed.F, initialise_varia.F
1769       -> enables initialisation interface for ECCO package
1770     o Rescaling of external forcing fields immediately after read
1771       (removed from external_forcing.F)
1772       -> new: surface_fields_scale.F
1773       -> affects ini_foorcing.F, external_fields_load.F
1774     o Computation of surface tendencies before tendency updates.
1775       -> new: external_forcing_surf.F
1776     o Change of variable names useGMRedi, useKPP, useECCO
1777     o Further changes in dynamics.F, impldiff.F for TAMC
1778     o Tested for experiments 0, 2, 4.
1779       - not yet tested for GMRedi.
1780       - not yet tested for KPP.
1781    
1782    checkpoint30
1783     o Updates for OBCs
1784     o New experiment for test OBCs (internal_wave)
1785     o New output.txt in verification/exp4/results/
1786     o Updates for KPP: calculation of viscosity corrected, new variables
1787       kpp_dumpFreq and kpp_taveFreq
1788     o CPP'd calls to system routines for TARGET_CRAY_VECTOR (P.H.)
1789       and entry for T90 in genmake
1790    
1791    checkpoint29
1792     o packaged KPP and GM/Redi
1793    
1794    checkpoint28
1795     o Corrected initialization of hFacMin for difference vertical coordinates
1796     o Modified calculation of partial cell thickness to more robust algorithm
1797     o config_summary.F: replaced write_1D_... by write_0D_...
1798       read_write.F: added subroutines write_0D_...
1799     o routines calc_common_factors, calc_gs, calc_gt, calc_phi_hyd, find_rho:
1800       included some initialisations required for TAMC.
1801     o routine calc_isoslopes: modified sqrt computation to make it
1802       differentiable for zero argument.
1803     o routines dynamics, impldiff:
1804       included store directives and tape key computations required for TAMC.
1805     o ALL TAMC related changes are between ifdef ALLOW_AUTODIFF_TAMC
1806    
1807    checkpoint27
1808     o fixed calc_isoslopes() to so that cancellation of terms in tensor
1809       formulation works properly with variable resolution.
1810     o restructured the calling tree between the_model_main() and dynamics()
1811     o split initialise() into initialise_fixed() and initialise_varia()
1812     o introduced initialization file pSurfInitFile for free surface (cg2d_x)
1813       in new routine ini_psurf()
1814    
1815    checkpoint26
1816     o moved some #ifdef in optional routines to encompass everything
1817       except the argument declarations. This was using up some memory.
1818     o fixed macros like _ADT to work with both versions of Linux cpp
1819     o cleaned up some unused and uninitialized variables
1820       (helps when debugging with strict compile options)
1821     o split up CPP_EEOPTIONS.h into options and macros
1822       (macros are now in eesupp/inc/CPP_EEMACROS.h)
1823     o patch for 2 processor JAM mode
1824    
1825    checkpoint25
1826     o updates for OBCs and NH
1827     o dramatically reduced memory usage
1828     o added "JAM" routines for use on Artic network
1829     o parameterization of convection by implicit vertical diffusion
1830     o added a diagnostic of convective index
1831     o moved call to calc_divg_hat() from dynamics() to solve_for_pressure()
1832       (this is was partly for OBCs and NH but also in anticipation of
1833        an explicit free-surface option)
1834     o initial state input files for U and V
1835    
1836    checkpoint24
1837     o Removed some spurious "REAL"s
1838     o Updated KPP to latest version from JPL
1839     o Added a COS(latitude) in horizontal viscosity
1840    
1841    checkpoint23
1842     o Added del^4 diffusion for salt and temperature
1843     o Multiple minor fixes (implicit none's, arguments to global_sum, etc.)
1844    
1845    checkpoint22
1846     o Made many small changes: implicit none, format(i5), etc...
1847     o Introduced KPP mixing scheme (compiles and runs but *not* tested)
1848    
1849    checkpoint21
1850     o Introduced new I/O package that supports direct-access records (mdsio.F)
1851     o Split-up mid-level I/O routines
1852     o Updated input data for experiments 0,1,2,4 and 5
1853     o Finally removed the genmake.* scripts (everyone seems happy with genmake)
1854    
1855    checkpoint20
1856     o Tidied up open-boundaries some more
1857     o Added non-hydrostatic code
1858     o Fixed some input data
1859     o Modified MPI start-up to work in "coupled" context.
1860    
1861    checkpoint19
1862     o Tidied up directory structure for verification experiments.
1863     o Added new code for open boundaries.
1864     o Corrected advective terms near boundaries.
1865     o Added CPP flag for "old UV" geometry and corrected spherical geometry.
1866     o Implemented free-slip/no-slip BCs and del^4 dissipation.
1867     o Split default parameters out of ini_parms.F into set_defaults.F.
1868    
1869    checkpoint18
1870     o Further changes for optional code generation with
1871       CPP - ugh!
1872    
1873  checkpoint17  checkpoint17
1874   o Beginning to incorporating modularity   o Beginning to incorporating modularity
1875     for supporting atmos. and ocean configs.     for supporting atmos. and ocean configs.

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