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revision 1.1309 by jmc, Tue Oct 12 13:50:14 2010 UTC revision 1.1314 by jmc, Sat Oct 16 17:23:12 2010 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o eesupp/src:
8       fix flow dir for exch1_z_RX_cube, exch1_uv_RX_cube & exch1_bg_RX_cube
9    o pkg/seaice/seaice_growth.F
10      Revision 1.89 of seaice_growth.F completes the overall october 2010 revision and
11      merging process. The merged routine has two branches, and one activates the 'evolution'
12      branch by setting SEAICE_GROWTH_LEGACY to undef (at the top of the routine for now).
13      In summary, here is what the '10/10 revision' did consist of
14        part 1: seaice_growth.F revisions 1.71 to 1.75
15          - Preliminary seaice_growth.F clean-up, keeping test results strictly unchanged.
16            The emphasis here was on improving readability (e.g. by trying to use meaningful
17            variable names) and modularity (e.g. by adding arrays to store heff etc. updates).
18        part 1.5:
19          - revising the lab_sea experiment to make it a more useful (i.e. stable
20            and representative of an actual model run). This was done by generating a
21            (winter) pickup to start from, switching back the main experiment dynamic
22            solver from evp to lsr, having one of the experiments use the free drift solution.
23        part 2: seaice_growth.F revisions 1.76 to 1.85
24          - Sorting out hard-coded constants that prevented heat and fresh water conservation.
25          - Sorting out the various fields units and sign (set early on and reset at the end)
26            to avoid numerous scalings/re-scalings. By v1.85 the basic unit for ice, heat and
27            fresh water stock is 'effective ice meters', and >0 implies more ice/snow.
28          - Using tendency terms arrays (d_HEFF* etc.) to alleviate remaining code locks,
29            and simplifying logical expressions to further improve readibility.
30        part 3: seaice_growth.F revisions 1.86 to 1.89
31          - Re-organize the blocks of code more logically.
32          - Merging the '_if.F' pieces that add something new.
33  o pkg/thsice:  o pkg/thsice:
34     re-arrange calculation in THSICE_SOLVE4TEMP: move outside of i,j loops    - vectorize thsice_solve4temp and thsice_get_exf.
35        Problem: thsice_solve4temp has an unvectorizable statement that
36        might also be problematic for TAF
37      - thsice_get_exf: add the ALLOW_BULK_LARGEYEAGER04 CPP-flag. This
38        does not change the verifcation experiment, but will change all
39        experiments that have this flag undefined (not tested in verification);
40        a little reorganization to save a few 2D fields and recomputations
41    o pkg/obcs: add support for exch2
42      - the position of the boundary and prescribed values are specified using
43        a global domain with exch2 facets stacked
44        - in x for N,S boundaries (like W2_mapIO=-1)
45        - in y for E,W boundaries (so E,W boundaries do not overlap)
46    o pkg/mdsio: add support for writing global sections with exch2
47        file layout is as for obcs described above:
48        - for x-z sections, facets are stacked in x (like W2_mapIO=-1)
49        - for y-z sections, facets are stacked in y
50    o pkg/thsice:
51       - change a few routines for better vectorization: thsice_albedo.F,
52         thsice_step_temp.F, and in thsice_calc_thickn.F. Results are
53         not affected, but in particular the latter routine has changed
54         dramatically (not necessarily easier to read now).
55       - re-arrange calculation in THSICE_SOLVE4TEMP: move outside of i,j loops
56     iteration loop and call to S/R THSICE_GET_BULKF & THSICE_GET_EXF.     iteration loop and call to S/R THSICE_GET_BULKF & THSICE_GET_EXF.
57  o verification/lab_sea:  o verification/lab_sea:
58    - overhaul of the forward model experiments. The main motivation    - overhaul of the forward model experiments. The main motivation
59      for this revision is that lab_sea has proven quite fragile (when      for this revision is that lab_sea has proven quite fragile (when
60      changing the sea-ice code, and switching platforms) to a point      changing the sea-ice code, and switching platforms) to a point
61      when failures were very hard to attribute to specific code problems.      when failures were very hard to attribute to specific code problems.
62    - the suspected reason for this fragility is noise amplification by evp so,    - the suspected reason for this fragility is noise amplification by evp so,
63      to start with, we decided to replace evp with lsr in the main experiment.      to start with, we decided to replace evp with lsr in the main experiment.
64    - the input.lsr experiment thus became obsolete and was removed.    - the input.lsr experiment thus became obsolete and was removed.
65    - it was replaced with the input.fd experiment that uses an    - it was replaced with the input.fd experiment that uses an
66      analytical "free drift" solution as the ice velocity field.      analytical "free drift" solution as the ice velocity field.
67    - Taken together, input (lsr), input.fd (free drift) and input.hb87 (evp)    - Taken together, input (lsr), input.fd (free drift) and input.hb87 (evp)
68      will hopefully allow us to discriminate problems due to dynamic solvers      will hopefully allow us to discriminate problems due to dynamic solvers
69      from problems due to the thermodynamic code. input.salt_plume (lsr) allows      from problems due to the thermodynamic code. input.salt_plume (lsr) allows
70      us to test additional options, along with the salt plume package.      us to test additional options, along with the salt plume package.
71    - Finally a pickup was generated (at the end of a one year run) to    - Finally a pickup was generated (at the end of a one year run) to
72      make the tests more representative of an actual model run. Previously      make the tests more representative of an actual model run. Previously
73      the tests starting point was a 1m thickness of ice everywhere.      the tests starting point was a 1m thickness of ice everywhere.
74  o pkg/seaice:  o pkg/seaice:
75    - introducing S\R seaice_freedrift.F that compute the    - introducing S\R seaice_freedrift.F that compute the
76      analytical solution to an approximate ice momentum      analytical solution to an approximate ice momentum
77      equation (i.e. the simple stress/coriolis balance).      equation (i.e. the simple stress/coriolis balance).
78    - define SEAICE_ALLOW_FREEDRIFT to trigger the computation    - define SEAICE_ALLOW_FREEDRIFT to trigger the computation
79      of the free drift velocity field, and enable its use.      of the free drift velocity field, and enable its use.
80      To actually use the free drift solution as the model ice      To actually use the free drift solution as the model ice
81      velocity field set SEAICEuseFREEDRIFT to .TRUE. in data.seaice.      velocity field set SEAICEuseFREEDRIFT to .TRUE. in data.seaice.
82  o move "useOASIS" from PARAMS.h to EEPARAMS.h and read it from "eedata"  o move "useOASIS" from PARAMS.h to EEPARAMS.h and read it from "eedata"
83    
84  checkpoint62l (2010/10/04)  checkpoint62l (2010/10/04)
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