/[MITgcm]/MITgcm/model/src/forward_step.F
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revision 1.6 by cnh, Sun Feb 4 14:38:47 2001 UTC revision 1.139 by heimbach, Sun Apr 9 17:35:30 2006 UTC
# Line 1  Line 1 
1  C $Header$  C $Header$
2  C $Name$  C $Name$
3    
4    #include "PACKAGES_CONFIG.h"
5  #include "CPP_OPTIONS.h"  #include "CPP_OPTIONS.h"
6    
7        SUBROUTINE FORWARD_STEP(  #ifdef ALLOW_GMREDI
8       I                    doHalfStep, iLoop,  # include "GMREDI_OPTIONS.h"
9       U                    myCurrentTime, myCurrentIter,  #endif
10       &                    myThid)  #ifdef ALLOW_OBCS
11  C     /==========================================================\  # include "OBCS_OPTIONS.h"
12  C     | SUBROUTINE FORWARD_STEP                                  |  #endif
13  C     | o Does one instance of the model time stepping           |  
14  C     |   The time stepping loop in THE_MAIN_LOOP() calls        |  CBOP
15  C     |   this routine                                           |  C     !ROUTINE: FORWARD_STEP
16  C     |==========================================================|  C     !INTERFACE:
17  C     \==========================================================/        SUBROUTINE FORWARD_STEP( iloop, myTime, myIter, myThid )
18        IMPLICIT NONE  
19  C  C     !DESCRIPTION: \bv
20  C     Call Tree  C     *==================================================================
21  C     =========  C     | SUBROUTINE forward_step
22  C      C     | o Run the ocean model and, optionally, evaluate a cost function.
23  C      THE_MAIN_LOOP()  C     *==================================================================
24  C       |  C     |
25  C  ==>  | ** Time stepping loop starts here **  C     | THE_MAIN_LOOP is the toplevel routine for the Tangent Linear and
26  C  |    |  C     | Adjoint Model Compiler (TAMC). For this purpose the initialization
27  C /|\   |-FORWARD_STEP  C     | of the model was split into two parts. Those parameters that do
28  C  |    |  |  C     | not depend on a specific model run are set in INITIALISE_FIXED,
29  C /|\   |  |--LOAD_EXTERNAL_DATA  C     | whereas those that do depend on the specific realization are
30  C  |    |  |   o Load and/or set time dependent forcing fields  C     | initialized in INITIALISE_VARIA.
31  C /|\   |  |  C     |
32  C  |    |  |--DYNAMICS  C     *==================================================================
33  C /|\   |  |   o Evaluate "forward" terms  C     \ev
 C  |    |  |  
 C /|\   |  |  
 C  |    |  |--DO_THE_MODEL_IO  
 C /|\   |  |   o Write model state  
 C  |    |  |  
 C /|\   |  |  
 C  |    |  |--SOLVE_FOR_PRESSURE  
 C /|\   |  |   o Find pressure field to keep flow non-divergent  
 C  |    |  |  
 C /|\   |  |  
 C  |    |  |--THE_CORRECTION_STEP  
 C /|\   |  |   o Correct flow field with pressure gradient  
 C  |    |  |     and cycle time-stepping arrays (for all fields)  
 C /|\   |  |  
 C  |    |  |--DO_GTERM_BLOCKING_EXCHANGES  
 C /|\   |  |   o Update overlap regions  
 C  |    |  |  
 C /|\   |  |  
 C  |    |  |--WRITE_CHECKPOINT  
 C /|\   |  |   o Write restart file(s)  
 C  |    |  
 C /|\   |  
 C  |<== | ** Time stepping loop finishes here **  
 C  
34    
35  C     == Global variables ===  C     !USES:
36          IMPLICIT NONE
37    C     == Global variables ==
38  #include "SIZE.h"  #include "SIZE.h"
39  #include "EEPARAMS.h"  #include "EEPARAMS.h"
40  #include "PARAMS.h"  #include "PARAMS.h"
41  #include "DYNVARS.h"  #include "DYNVARS.h"
42  #include "CG2D.h"  
43  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_MNC
44  #include "CG3D.h"  #include "MNC_PARAMS.h"
45          EXTERNAL DIFFERENT_MULTIPLE
46          LOGICAL  DIFFERENT_MULTIPLE
47    #endif
48    
49    #ifdef HAVE_SIGREG
50    #include "SIGREG.h"
51    #endif
52    
53    #ifdef ALLOW_SHAP_FILT
54    # include "SHAP_FILT.h"
55    #endif
56    #ifdef ALLOW_ZONAL_FILT
57    # include "ZONAL_FILT.h"
58    #endif
59    #ifdef COMPONENT_MODULE
60    # include "CPL_PARAMS.h"
61  #endif  #endif
62    
63    #ifdef ALLOW_AUTODIFF_TAMC
64    # include "FFIELDS.h"
65    
66    # include "tamc.h"
67    # include "ctrl.h"
68    # include "ctrl_dummy.h"
69    # include "cost.h"
70    # include "EOS.h"
71    # ifdef NONLIN_FRSURF
72    #  include "GRID.h"
73    # endif
74    # ifdef ALLOW_EXF
75    #  include "exf_fields.h"
76    #  include "exf_clim_fields.h"
77    #  ifdef ALLOW_BULKFORMULAE
78    #   include "exf_constants.h"
79    #  endif
80    # endif
81    # ifdef ALLOW_PTRACERS
82    #  include "PTRACERS_SIZE.h"
83    #  include "PTRACERS.h"
84    # endif
85    # ifdef ALLOW_OBCS
86    #  include "OBCS.h"
87    #  ifdef ALLOW_PTRACERS
88    #   include "OBCS_PTRACERS.h"
89    #  endif
90    # endif
91    # ifdef ALLOW_CD_CODE
92    #  include "CD_CODE_VARS.h"
93    # endif
94    # ifdef ALLOW_THSICE
95    #  include "THSICE_VARS.h"
96    # endif
97    # ifdef ALLOW_EBM
98    #  include "EBM.h"
99    # endif
100    # ifdef EXACT_CONSERV
101    #  include "SURFACE.h"
102    # endif
103    # ifdef ALLOW_KPP
104    #  include "KPP.h"
105    # endif
106    # ifdef ALLOW_GMREDI
107    #  include "GMREDI.h"
108    # endif
109    #endif /* ALLOW_AUTODIFF_TAMC */
110    
111    C     !LOCAL VARIABLES:
112  C     == Routine arguments ==  C     == Routine arguments ==
113  C     doHalfStep - If .TRUE. then this is the last half step  C     note: under the multi-threaded model myiter and
114  C     iLoop         - Invocation count (counter in THE_MAIN_LOOP)  C           mytime are local variables passed around as routine
115  C     myCurrentIter - Iteration counter for this thread  C           arguments. Although this is fiddly it saves the need to
116  C     myCurrentTime - Time counter for this thread  C           impose additional synchronisation points when they are
117  C     myThid - Thread number for this instance of the routine.  C           updated.
118        LOGICAL doHalfStep  C     myIter - iteration counter for this thread
119        INTEGER iLoop  C     myTime - time counter for this thread
120        INTEGER myCurrentIter  C     myThid - thread number for this instance of the routine.
121        _RL     myCurrentTime        INTEGER iloop
122        INTEGER myThid          INTEGER myThid
123          INTEGER myIter
124          _RL     myTime
125    
126  C     == Local variables ==  C     == Local variables ==
127    #ifdef COMPONENT_MODULE
128          INTEGER myItP1
129    #endif
130    CEOP
131    
132    #ifdef ALLOW_DEBUG
133          IF ( debugLevel .GE. debLevB )
134         &    CALL DEBUG_ENTER('FORWARD_STEP',myThid)
135    #endif
136    
137    #ifdef ALLOW_AUTODIFF_TAMC
138    C--   Reset the model iteration counter and the model time.
139          myIter = nIter0 + (iloop-1)
140          myTime = startTime + float(iloop-1)*deltaTclock
141    #endif
142    
143  C--   Load forcing/external data fields  #ifdef ALLOW_AUTODIFF_TAMC
144        CALL TIMER_START('I/O (READ)         [FORWARD_STEP]',myThid)  c**************************************
145        CALL EXTERNAL_FIELDS_LOAD( myCurrentTime, myCurrentIter, myThid )  #include "checkpoint_lev1_directives.h"
146        CALL TIMER_STOP ('I/O (READ)         [FORWARD_STEP]',myThid)  c**************************************
147    #endif
148  C--   Step forward fields and calculate time tendency terms  
149        CALL TIMER_START('DYNAMICS           [FORWARD_STEP]',myThid)  C--   Switch on/off diagnostics for snap-shot output:
150        CALL DYNAMICS( myCurrentTime, myCurrentIter, myThid )  #ifdef ALLOW_DIAGNOSTICS
151        CALL TIMER_STOP ('DYNAMICS           [FORWARD_STEP]',myThid)        IF ( useDiagnostics ) THEN
152            CALL DIAGNOSTICS_SWITCH_ONOFF( myTime, myIter, myThid )
153  #ifdef ALLOW_NONHYDROSTATIC  C--   State-variables diagnostics
154  C--   Step forward W field in N-H algorithm          CALL TIMER_START('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
155        IF ( nonHydrostatic ) THEN          CALL DO_STATEVARS_DIAGS( myTime, 0, myIter, myThid )
156         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)          CALL TIMER_STOP ('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
        CALL CALC_GW( myThid)  
        CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)  
157        ENDIF        ENDIF
158  #endif  #endif
159    
160  #ifdef ALLOW_SHAP_FILT  C--   Call Bulk-Formulae forcing package
161  C--   Step forward all tiles, filter and exchange.  #ifdef ALLOW_BULK_FORCE
162        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)        IF ( useBulkForce ) THEN
163        CALL SHAP_FILT_APPLY(  #ifdef ALLOW_DEBUG
164       I                     gUnm1, gVnm1, gTnm1, gSnm1,         IF ( debugLevel .GE. debLevB )
165       I                     myCurrentTime, myCurrentIter, myThid )       &    CALL DEBUG_CALL('BULKF_FIELDS_LOAD',myThid)
       CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)  
166  #endif  #endif
167           CALL TIMER_START('BULKF_FORCING      [FORWARD_STEP]',mythid)
168    C-    load all forcing fields at current time
169           CALL BULKF_FIELDS_LOAD( myTime, myIter, myThid )
170    C-    calculate qnet and empmr (and wind stress)
171           CALL BULKF_FORCING( myTime, myIter, myThid )
172           CALL TIMER_STOP ('BULKF_FORCING      [FORWARD_STEP]',mythid)
173          ENDIF
174    #endif /* ALLOW_BULK_FORCE */
175    
176  #ifdef ALLOW_ZONAL_FILT  C--   Call external forcing package
177        CALL ZONAL_FILT_APPLY(  # ifdef ALLOW_EXF
178       U           gUnm1, gVnm1, gTnm1, gSnm1,  #  ifdef ALLOW_DEBUG
179       I           myThid )        IF ( debugLevel .GE. debLevB )
180         &    CALL DEBUG_CALL('EXF_GETFORCING',myThid)
181    #  endif
182          CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
183          CALL EXF_GETFORCING( mytime, myiter, mythid )
184          CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
185    # else /* ALLOW_EXF undef */
186    cph The following IF-statement creates an additional dependency
187    cph for the forcing fields requiring additional storing.
188    cph Therefore, the IF-statement will be put between CPP-OPTIONS,
189    cph assuming that ALLOW_SEAICE has not yet been differentiated.
190    #  if (defined (ALLOW_SEAICE) || defined (ALLOW_EBM))
191          IF ( .NOT. useSEAICE .AND. .NOT. useEBM ) THEN
192    #  endif
193    #ifdef ALLOW_DEBUG
194           IF ( debugLevel .GE. debLevB )
195         &    CALL DEBUG_CALL('EXTERNAL_FIELDS_LOAD',myThid)
196  #endif  #endif
197           CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
198           CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
199           CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
200    # ifdef NONLIN_FRSURF
201    CADJ STORE SST    = comlev1, key = ikey_dynamics
202    CADJ STORE SSS    = comlev1, key = ikey_dynamics
203    #  ifdef SHORTWAVE_HEATING
204    CADJ STORE Qsw    = comlev1, key = ikey_dynamics
205    #  endif
206    # endif
207    #  if (defined (ALLOW_SEAICE) || defined (ALLOW_EBM))
208          ENDIF
209    #  endif
210    # endif /* ALLOW_EXF */
211    
212  C--   Do IO if needed.  #ifdef ALLOW_AUTODIFF
213  C     Note:  c--   Add control vector for forcing and parameter fields
214  C     =====        if ( myiter .EQ. nIter0 )
215  C     At this point model arrays hold U,V,T,S  at "time-level" N       &     CALL CTRL_MAP_FORCING (mythid)
216  C     and cg2d_x at "time-level" N-1/2 where N = I+timeLevBase-1.  #endif
217  C     By convention this is taken to be the model "state".  
218        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)  #if (defined (ALLOW_AUTODIFF_TAMC) && defined (ALLOW_AUTODIFF_MONITOR))
219        CALL DO_THE_MODEL_IO(  C     Include call to a dummy routine. Its adjoint will be
220       &        doHalfStep, myCurrentTime, myCurrentIter, myThid )  C     called at the proper place in the adjoint code.
221        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)  C     The adjoint routine will print out adjoint values
222    C     if requested. The location of the call is important,
223    C     it has to be after the adjoint of the exchanges
224    C     (DO_GTERM_BLOCKING_EXCHANGES).
225          CALL DUMMY_IN_STEPPING( myTime, myIter, myThid )
226    cph   I've commented this line since it may conflict with MITgcm's adjoint
227    cph   However, need to check whether that's still consistent
228    cph   with the ecco-branch (it should).
229    cph      CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
230    #endif
231    
232    # ifdef ALLOW_SEAICE
233    C--   Call sea ice model to compute forcing/external data fields.  In
234    C     addition to computing prognostic sea-ice variables and diagnosing the
235    C     forcing/external data fields that drive the ocean model, SEAICE_MODEL
236    C     also sets theta to the freezing point under sea-ice.  The implied
237    C     surface heat flux is then stored in variable surfaceTendencyTice,
238    C     which is needed by KPP package (kpp_calc.F and kpp_transport_t.F)
239    C     to diagnose surface buoyancy fluxes and for the non-local transport
240    C     term.  Because this call precedes model thermodynamics, temperature
241    C     under sea-ice may not be "exactly" at the freezing point by the time
242    C     theta is dumped or time-averaged.
243          IF ( useSEAICE ) THEN
244    #ifdef ALLOW_DEBUG
245             IF ( debugLevel .GE. debLevB )
246         &    CALL DEBUG_CALL('SEAICE_MODEL',myThid)
247    #endif
248             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
249             CALL SEAICE_MODEL( myTime, myIter, myThid )
250             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
251          ENDIF
252    # endif /* ALLOW_SEAICE */
253    
254    #ifdef ALLOW_AUTODIFF_TAMC
255    # ifdef ALLOW_PTRACERS
256    cph this is now also replaced by storing elsewhere
257    cphCADJ STORE ptracer  = comlev1, key = ikey_dynamics
258    # endif
259    #endif
260    
261    #ifdef ALLOW_OFFLINE
262          IF ( useOffLine ) THEN
263            CALL TIMER_START('OFFLINE_FIELDS_LOAD [FORWARD_STEP]',myThid)
264    #ifdef ALLOW_DEBUG
265            IF ( debugLevel .GE. debLevB )
266         &        CALL DEBUG_CALL('OFFLINE_FIELDS_LOAD',myThid)
267    #endif /* ALLOW_DEBUG */
268            CALL OFFLINE_FIELDS_LOAD( myTime, myIter, myThid )
269            CALL TIMER_STOP ('OFFLINE_FIELDS_LOAD [FORWARD_STEP]',myThid)
270          ENDIF
271    #endif /* ALLOW_OFFLINE */
272    
273    #ifdef ALLOW_GCHEM
274            IF ( useGCHEM ) THEN
275    #ifdef ALLOW_DEBUG
276             IF ( debugLevel .GE. debLevB )
277         &        CALL DEBUG_CALL('GCHEM_FIELDS_LOAD',myThid)
278    #endif /* ALLOW_DEBUG */
279             CALL GCHEM_FIELDS_LOAD( mytime, myiter, mythid )
280            ENDIF
281    #endif /* ALLOW_GCHEM */
282    
283    #ifdef ALLOW_RBCS
284            IF ( useRBCS ) THEN
285             CALL RBCS_FIELDS_LOAD( mytime, myiter, mythid )
286            ENDIF
287    #endif
288    
289    #ifdef COMPONENT_MODULE
290           IF ( useCoupler .AND. cpl_earlyExpImpCall ) THEN
291    C      Post coupling data that I export.
292    C      Read in coupling data that I import.
293             CALL TIMER_START('CPL_EXPORT-IMPORT  [FORWARD_STEP]',myThid)
294             CALL CPL_EXPORT_MY_DATA(       myIter, myTime, myThid )
295             CALL CPL_IMPORT_EXTERNAL_DATA( myIter, myTime, myThid )
296             CALL TIMER_STOP ('CPL_EXPORT-IMPORT  [FORWARD_STEP]',myThid)
297           ENDIF
298    #endif /* COMPONENT_MODULE */
299    
300    #ifdef ALLOW_EBM
301            IF ( useEBM ) THEN
302    # ifdef ALLOW_DEBUG
303             IF ( debugLevel .GE. debLevB )
304         &    CALL DEBUG_CALL('EBM',myThid)
305    # endif
306             CALL TIMER_START('EBM                [FORWARD_STEP]',mythid)
307             CALL EBM_DRIVER ( myTime, myIter, myThid )
308             CALL TIMER_STOP ('EBM                [FORWARD_STEP]',mythid)
309            ENDIF
310    #endif
311    
312    C--     Step forward fields and calculate time tendency terms.
313    
314    #ifdef ALLOW_DEBUG
315           IF ( debugLevel .GE. debLevB )
316         &    CALL DEBUG_CALL('DO_ATMOSPHERIC_PHYS',myThid)
317    #endif
318           CALL TIMER_START('DO_ATMOSPHERIC_PHYS [FORWARD_STEP]',mythid)
319           CALL DO_ATMOSPHERIC_PHYS( myTime, myIter, myThid )
320           CALL TIMER_STOP ('DO_ATMOSPHERIC_PHYS [FORWARD_STEP]',mythid)
321    
322    #ifdef ALLOW_AUTODIFF_TAMC
323    # ifdef ALLOW_KPP
324    CADJ STORE uvel               = comlev1, key = ikey_dynamics
325    CADJ STORE vvel               = comlev1, key = ikey_dynamics
326    # endif
327    # ifdef EXACT_CONSERV
328    cphCADJ STORE empmr              = comlev1, key = ikey_dynamics
329    cphCADJ STORE pmepr              = comlev1, key = ikey_dynamics
330    # endif
331    # ifdef NONLIN_FRSURF
332    cph-test
333    CADJ STORE hFacC              = comlev1, key = ikey_dynamics
334    # endif
335    #endif /* ALLOW_AUTODIFF_TAMC */
336    
337    #ifndef ALLOW_AUTODIFF_TAMC
338           IF ( .NOT. useOffLine ) THEN
339    #endif
340    #ifdef ALLOW_DEBUG
341           IF ( debugLevel .GE. debLevB )
342         &    CALL DEBUG_CALL('DO_OCEANIC_PHYS',myThid)
343    #endif
344           CALL TIMER_START('DO_OCEANIC_PHYS     [FORWARD_STEP]',mythid)
345           CALL DO_OCEANIC_PHYS( myTime, myIter, myThid )
346           CALL TIMER_STOP ('DO_OCEANIC_PHYS     [FORWARD_STEP]',mythid)
347    #ifdef ALLOW_AUTODIFF_TAMC
348    CADJ STORE EmPmR    = comlev1, key = ikey_dynamics
349    # ifdef EXACT_CONSERV
350    CADJ STORE pmepr    = comlev1, key = ikey_dynamics
351    # endif
352    #else
353           ENDIF
354    #endif
355    
356    #ifdef ALLOW_AUTODIFF_TAMC
357    # ifdef NONLIN_FRSURF
358    cph-test
359    CADJ STORE hFac_surfC         = comlev1, key = ikey_dynamics
360    CADJ STORE hfac_surfs         = comlev1, key = ikey_dynamics
361    CADJ STORE hfac_surfw         = comlev1, key = ikey_dynamics
362    CADJ STORE hFacC, hFacS, hFacW
363    CADJ &     = comlev1, key = ikey_dynamics
364    CADJ STORE recip_hFacC, recip_hFacS, recip_hFacW
365    CADJ &     = comlev1, key = ikey_dynamics
366    c
367    CADJ STORE surfaceforcingu = comlev1, key = ikey_dynamics
368    CADJ STORE surfaceforcingv = comlev1, key = ikey_dynamics
369    # endif
370    #endif /* ALLOW_AUTODIFF_TAMC */
371    
372    #ifdef ALLOW_GCHEM
373    C     GCHEM package is an interface for any bio-geochemical or
374    C     ecosystem model you would like to include.
375    C     If GCHEM_SEPARATE_FORCING is not defined, you are
376    C     responsible for computing tendency terms for passive
377    C     tracers and storing them on a 3DxNumPtracers-array called
378    C     gchemTendency in GCHEM_CALC_TENDENCY. This tendency is then added
379    C     to gPtr in ptracers_forcing later-on.
380    C     If GCHEM_SEPARATE_FORCING is defined, you are reponsible for
381    C     UPDATING ptracers directly in GCHEM_FORCING_SEP. This amounts
382    C     to a completely separate time step that you have to implement
383    C     yourself (Eulerian seems to be fine in most cases).
384    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
385    C     CAVEAT: Up to now, when GCHEM is turned on the field ptracerForcingSurf,
386    C     which is needed for KPP is not set properly. ptracerForcingSurf must
387    C     be treated differently depending on whether GCHEM_SEPARATE_FORCING
388    C     is define or not. TBD.
389    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
390           IF ( useGCHEM ) THEN
391    #ifdef ALLOW_DEBUG
392            IF ( debugLevel .GE. debLevB )
393         &       CALL DEBUG_CALL('GCHEM_CALC_TENDENCY',myThid)
394    #endif
395            CALL TIMER_START('GCHEM_CALC_TENDENCY [FORWARD_STEP]',myThid)
396            CALL GCHEM_CALC_TENDENCY( myTime, myIter, myThid )
397            CALL TIMER_STOP ('GCHEM_CALC_TENDENCY [FORWARD_STEP]',myThid)
398           ENDIF
399    #endif /* ALLOW_GCHEM */
400    
401    #ifdef ALLOW_AUTODIFF_TAMC
402    cph needed to be moved here from do_oceanic_physics
403    cph to be visible down the road
404    c
405    CADJ STORE surfaceForcingS    = comlev1, key = ikey_dynamics
406    CADJ STORE surfaceForcingT    = comlev1, key = ikey_dynamics
407    CADJ STORE surfaceForcingTice = comlev1, key = ikey_dynamics
408    ctest(
409    CADJ STORE IVDConvCount       = comlev1, key = ikey_dynamics
410    ctest)
411    # ifdef ALLOW_PTRACERS
412    CADJ STORE surfaceForcingPtr  = comlev1, key = ikey_dynamics
413    # endif
414    c
415    # ifdef ALLOW_GMREDI
416    CADJ STORE Kwx                = comlev1, key = ikey_dynamics
417    CADJ STORE Kwy                = comlev1, key = ikey_dynamics
418    CADJ STORE Kwz                = comlev1, key = ikey_dynamics
419    #  ifdef GM_BOLUS_ADVEC
420    CADJ STORE GM_PsiX            = comlev1, key = ikey_dynamics
421    CADJ STORE GM_PsiY            = comlev1, key = ikey_dynamics
422    #  endif
423    # endif
424    c
425    # ifdef ALLOW_KPP
426    CADJ STORE KPPghat            = comlev1, key = ikey_dynamics
427    CADJ STORE KPPfrac            = comlev1, key = ikey_dynamics
428    CADJ STORE KPPdiffKzS         = comlev1, key = ikey_dynamics
429    CADJ STORE KPPdiffKzT         = comlev1, key = ikey_dynamics
430    # endif
431    c
432    # ifdef NONLIN_FRSURF
433    CADJ STORE etaH               = comlev1, key = ikey_dynamics
434    #  ifdef ALLOW_CD_CODE
435    CADJ STORE etanm1             = comlev1, key = ikey_dynamics
436    #  endif
437    # endif
438    #endif /* ALLOW_AUTODIFF_TAMC */
439    
440          IF ( .NOT.staggerTimeStep ) THEN
441    #ifdef ALLOW_DEBUG
442            IF ( debugLevel .GE. debLevB )
443         &    CALL DEBUG_CALL('THERMODYNAMICS',myThid)
444    #endif
445            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
446            CALL THERMODYNAMICS( myTime, myIter, myThid )
447            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
448    C--    if not staggerTimeStep: end
449          ENDIF
450    c #ifdef ALLOW_NONHYDROSTATIC
451          IF ( implicitIntGravWave ) THEN
452            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
453            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
454            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
455          ENDIF
456    c #endif
457    
458    #ifdef COMPONENT_MODULE
459           IF ( useCoupler .AND. .NOT.cpl_earlyExpImpCall ) THEN
460    C      Post coupling data that I export.
461    C      Read in coupling data that I import.
462             myItP1 = myIter + 1
463             CALL TIMER_START('CPL_EXPORT-IMPORT  [FORWARD_STEP]',myThid)
464             CALL CPL_EXPORT_MY_DATA(       myItP1, myTime, myThid )
465             CALL CPL_IMPORT_EXTERNAL_DATA( myItP1, myTime, myThid )
466             CALL TIMER_STOP ('CPL_EXPORT-IMPORT  [FORWARD_STEP]',myThid)
467    # ifdef ALLOW_OCN_COMPON_INTERF
468            IF ( useRealFreshWaterFlux ) THEN
469             CALL OCN_APPLY_IMPORT( .FALSE., myTime, myIter, myThid )
470            ENDIF
471    # endif /* ALLOW_OCN_COMPON_INTERF */
472           ENDIF
473    #endif /* COMPONENT_MODULE */
474    
475    #ifdef ALLOW_AUTODIFF_TAMC
476    # ifdef NONLIN_FRSURF
477    CADJ STORE hFacC          = comlev1, key = ikey_dynamics
478    CADJ STORE hFacS          = comlev1, key = ikey_dynamics
479    CADJ STORE hFacW          = comlev1, key = ikey_dynamics
480    CADJ STORE recip_hFacC    = comlev1, key = ikey_dynamics
481    CADJ STORE recip_hFacS    = comlev1, key = ikey_dynamics
482    CADJ STORE recip_hFacW    = comlev1, key = ikey_dynamics
483    CADJ STORE etaN           = comlev1, key = ikey_dynamics
484    # endif
485    #endif
486    C--   Step forward fields and calculate time tendency terms.
487    #ifndef ALLOW_AUTODIFF_TAMC
488          IF ( momStepping ) THEN
489    #endif
490    #ifdef ALLOW_DEBUG
491            IF ( debugLevel .GE. debLevB )
492         &    CALL DEBUG_CALL('DYNAMICS',myThid)
493    #endif
494            CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
495            CALL DYNAMICS( myTime, myIter, myThid )
496            CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
497    #ifndef ALLOW_AUTODIFF_TAMC
498          ENDIF
499    #endif
500    
501    #ifdef ALLOW_AUTODIFF_TAMC
502    # ifdef NONLIN_FRSURF
503    cph-test
504    CADJ STORE gU, gV  = comlev1, key = ikey_dynamics
505    # endif
506    #endif
507    
508    C--   Update time-counter
509          myIter = nIter0 + iLoop
510          myTime = startTime + deltaTClock * float(iLoop)
511    
512    #ifdef ALLOW_MNC
513    C     Update the default next iter for MNC
514          IF ( useMNC ) THEN
515             CALL MNC_CW_CITER_SETG( 1, 1, -1, myIter , myThid )
516    
517    C        TODO: Logic should be added here so that users can specify, on
518    C        a per-citer-group basis, when it is time to update the
519    C        "current" (and not just the "next") iteration
520    
521    C        TODO: the following is just a temporary band-aid (mostly, for
522    C        Baylor) until someone writes a routine that better handles time
523    C        boundaries such as weeks, months, years, etc.
524             IF ( mnc_filefreq .GT. 0 ) THEN
525               IF (DIFFERENT_MULTIPLE(mnc_filefreq,myTime,deltaTClock))
526         &          THEN
527                 CALL MNC_CW_CITER_SETG( 1, 1, myIter, -1 , myThid )
528               ENDIF
529             ENDIF
530           ENDIF
531    #endif
532    
533    C--   Update geometric factors:
534    #ifdef NONLIN_FRSURF
535    C-    update hfacC,W,S and recip_hFac according to etaH(n+1) :
536          IF ( nonlinFreeSurf.GT.0) THEN
537           IF ( select_rStar.GT.0 ) THEN
538    # ifndef DISABLE_RSTAR_CODE
539    # ifdef ALLOW_AUTODIFF_TAMC
540    cph-test
541    CADJ STORE hFacC    = comlev1, key = ikey_dynamics
542    CADJ STORE hFacS    = comlev1, key = ikey_dynamics
543    CADJ STORE hFacW    = comlev1, key = ikey_dynamics
544    CADJ STORE recip_hFacC    = comlev1, key = ikey_dynamics
545    CADJ STORE recip_hFacS    = comlev1, key = ikey_dynamics
546    CADJ STORE recip_hFacW    = comlev1, key = ikey_dynamics
547    # endif
548            CALL TIMER_START('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
549            CALL UPDATE_R_STAR( myTime, myIter, myThid )
550            CALL TIMER_STOP ('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
551    # ifdef ALLOW_AUTODIFF_TAMC
552    cph-test
553    CADJ STORE hFacC    = comlev1, key = ikey_dynamics
554    CADJ STORE hFacS    = comlev1, key = ikey_dynamics
555    CADJ STORE hFacW    = comlev1, key = ikey_dynamics
556    CADJ STORE recip_hFacC    = comlev1, key = ikey_dynamics
557    CADJ STORE recip_hFacS    = comlev1, key = ikey_dynamics
558    CADJ STORE recip_hFacW    = comlev1, key = ikey_dynamics
559    # endif
560    # endif /* DISABLE_RSTAR_CODE */
561           ELSE
562    #ifdef ALLOW_AUTODIFF_TAMC
563    CADJ STORE hFac_surfC, hFac_surfS, hFac_surfW
564    CADJ &     = comlev1, key = ikey_dynamics
565    #endif
566            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
567            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
568            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
569           ENDIF
570          ENDIF
571    # ifdef ALLOW_AUTODIFF_TAMC
572    cph-test
573    CADJ STORE hFacC    = comlev1, key = ikey_dynamics
574    CADJ STORE hFacS    = comlev1, key = ikey_dynamics
575    CADJ STORE hFacW    = comlev1, key = ikey_dynamics
576    CADJ STORE recip_hFacC    = comlev1, key = ikey_dynamics
577    CADJ STORE recip_hFacS    = comlev1, key = ikey_dynamics
578    CADJ STORE recip_hFacW    = comlev1, key = ikey_dynamics
579    # endif
580    C-    update also CG2D matrix (and preconditioner)
581          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
582            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',myThid)
583            CALL UPDATE_CG2D( myTime, myIter, myThid )
584            CALL TIMER_STOP ('UPDATE_CG2D        [FORWARD_STEP]',myThid)
585          ENDIF
586    #endif /* NONLIN_FRSURF */
587    
588        IF (.NOT. doHalfStep) THEN  C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
589    #ifdef ALLOW_SHAP_FILT
590          IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
591            CALL TIMER_START('SHAP_FILT_UV        [FORWARD_STEP]',myThid)
592            IF (implicDiv2Dflow.LT.1.) THEN
593    C--   Explicit+Implicit part of the Barotropic Flow Divergence
594    C      => Filtering of uVel,vVel is necessary
595              CALL SHAP_FILT_APPLY_UV( uVel,vVel,
596         &                             myTime, myIter, myThid )
597            ENDIF
598            CALL SHAP_FILT_APPLY_UV( gU,gV,myTime,myIter,myThid)
599            CALL TIMER_STOP ('SHAP_FILT_UV        [FORWARD_STEP]',myThid)
600          ENDIF
601    #endif
602    #ifdef ALLOW_ZONAL_FILT
603          IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
604            CALL TIMER_START('ZONAL_FILT_UV       [FORWARD_STEP]',myThid)
605            IF (implicDiv2Dflow.LT.1.) THEN
606    C--   Explicit+Implicit part of the Barotropic Flow Divergence
607    C      => Filtering of uVel,vVel is necessary
608              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
609            ENDIF
610            CALL ZONAL_FILT_APPLY_UV( gU, gV, myThid )
611            CALL TIMER_STOP ('ZONAL_FILT_UV       [FORWARD_STEP]',myThid)
612          ENDIF
613    #endif
614    
615  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
616  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
617  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
618        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
619        CALL SOLVE_FOR_PRESSURE( myThid )  #ifdef ALLOW_AUTODIFF_TAMC
620        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)  # ifdef NONLIN_FRSURF
621    CADJ STORE uvel, vvel
622  C--   Correct divergence in flow field and cycle time-stepping  CADJ &     = comlev1, key = ikey_dynamics
623  C     arrays (for all fields)  CADJ STORE empmr,hfacs,hfacw
624        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)  CADJ &     = comlev1, key = ikey_dynamics
625    # endif
626    #endif
627            CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
628            CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
629            CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
630          ENDIF
631    
632    C--   Correct divergence in flow field and cycle time-stepping momentum
633    #ifndef ALLOW_AUTODIFF_TAMC
634          IF ( momStepping ) THEN
635    #endif
636            CALL TIMER_START('MOM_CORRECTION_STEP [FORWARD_STEP]',myThid)
637            CALL MOMENTUM_CORRECTION_STEP(myTime, myIter, myThid)
638            CALL TIMER_STOP ('MOM_CORRECTION_STEP [FORWARD_STEP]',myThid)
639    #ifndef ALLOW_AUTODIFF_TAMC
640          ENDIF
641    #endif
642    
643    #ifdef EXACT_CONSERV
644          IF (exactConserv) THEN
645    #ifdef ALLOW_AUTODIFF_TAMC
646    cph-test
647    cphCADJ STORE etaH          = comlev1, key = ikey_dynamics
648    #endif
649    C--   Update etaH(n+1) :
650            CALL TIMER_START('UPDATE_ETAH         [FORWARD_STEP]',mythid)
651            CALL UPDATE_ETAH( myTime, myIter, myThid )
652            CALL TIMER_STOP ('UPDATE_ETAH         [FORWARD_STEP]',mythid)
653          ENDIF
654    #endif /* EXACT_CONSERV */
655    
656    #ifdef NONLIN_FRSURF
657          IF ( select_rStar.NE.0 ) THEN
658    # ifndef DISABLE_RSTAR_CODE
659    C--   r* : compute the future level thickness according to etaH(n+1)
660            CALL TIMER_START('CALC_R_STAR       [FORWARD_STEP]',mythid)
661            CALL CALC_R_STAR(etaH, myTime, myIter, myThid )
662            CALL TIMER_STOP ('CALC_R_STAR       [FORWARD_STEP]',mythid)
663    # endif /* DISABLE_RSTAR_CODE */
664          ELSEIF ( nonlinFreeSurf.GT.0) THEN
665    C--   compute the future surface level thickness according to etaH(n+1)
666    # ifdef ALLOW_AUTODIFF_TAMC
667    CADJ STORE etaH          = comlev1, key = ikey_dynamics
668    # endif
669            CALL TIMER_START('CALC_SURF_DR      [FORWARD_STEP]',mythid)
670            CALL CALC_SURF_DR(etaH, myTime, myIter, myThid )
671            CALL TIMER_STOP ('CALC_SURF_DR      [FORWARD_STEP]',mythid)
672          ENDIF
673    # ifdef ALLOW_AUTODIFF_TAMC
674    cph-test
675    CADJ STORE hFac_surfC    = comlev1, key = ikey_dynamics
676    # endif
677    #endif /* NONLIN_FRSURF */
678    
679    C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
680          IF ( staggerTimeStep ) THEN
681    C--   do exchanges of U,V (needed for multiDim) when using stagger time-step :
682    #ifdef ALLOW_DEBUG
683            IF ( debugLevel .GE. debLevB )
684         &    CALL DEBUG_CALL('DO_STAGGER_FIELDS_EXCH.',myThid)
685    #endif
686            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
687            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
688            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
689    
690    #ifdef ALLOW_DIAGNOSTICS
691    C--   State-variables diagnostics
692           IF ( useDiagnostics ) THEN
693            CALL TIMER_START('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
694            CALL DO_STATEVARS_DIAGS( myTime, 1, myIter, myThid )
695            CALL TIMER_STOP ('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
696           ENDIF
697    #endif
698    
699    #ifdef ALLOW_DEBUG
700            IF ( debugLevel .GE. debLevB )
701         &    CALL DEBUG_CALL('THERMODYNAMICS',myThid)
702    #endif
703            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
704            CALL THERMODYNAMICS( myTime, myIter, myThid )
705            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
706    
707    C--    if staggerTimeStep: end
708          ENDIF
709    C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
710    
711    #ifdef ALLOW_AUTODIFF_TAMC
712    cph This is needed because convective_adjustment calls
713    cph find_rho which may use pressure()
714    CADJ STORE totphihyd  = comlev1, key = ikey_dynamics
715    #endif
716    C--   Cycle time-stepping Tracers arrays (T,S,+pTracers)
717            CALL TIMER_START('TRC_CORRECTION_STEP [FORWARD_STEP]',myThid)
718            CALL TRACERS_CORRECTION_STEP(myTime, myIter, myThid)
719            CALL TIMER_STOP ('TRC_CORRECTION_STEP [FORWARD_STEP]',myThid)
720    
721    #ifdef ALLOW_GCHEM
722    C     Add separate timestepping of chemical/biological/forcing
723    C     of ptracers here in GCHEM_FORCING_SEP
724            IF ( useGCHEM ) THEN
725    #ifdef ALLOW_DEBUG
726             IF ( debugLevel .GE. debLevB )
727         &        CALL DEBUG_CALL('GCHEM_FORCING_SEP',myThid)
728    #endif /* ALLOW_DEBUG */
729             CALL TIMER_START('GCHEM_FORCING_SEP  [FORWARD_STEP]',myThid)
730             CALL GCHEM_FORCING_SEP( myTime,myIter,myThid )
731             CALL TIMER_STOP ('GCHEM_FORCING_SEP  [FORWARD_STEP]',myThid)
732            ENDIF
733    #endif /* ALLOW_GCHEM */
734    
735  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
736  C     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
737  C     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
738  C     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
739    
740  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
741        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
742        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
743        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
744    
745    #ifdef ALLOW_DIAGNOSTICS
746          IF ( useDiagnostics ) THEN
747           CALL TIMER_START('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
748           CALL DO_STATEVARS_DIAGS( myTime, 2, myIter, myThid )
749           CALL TIMER_STOP ('DO_STATEVARS_DIAGS  [FORWARD_STEP]',myThid)
750          ENDIF
751    #endif
752    
753    C AMM
754    #ifdef ALLOW_GRIDALT
755            if (useGRIDALT) then
756             CALL GRIDALT_UPDATE(myThid)
757            endif
758    #endif
759    C AMM
760    
761    C AMM
762    #ifdef ALLOW_FIZHI
763            if( useFIZHI) then
764             CALL TIMER_START('FIZHI               [FORWARD_STEP]',mythid)
765             CALL STEP_FIZHI_CORR ( myTime, myIter, myThid, dTtracerLev(1) )
766             CALL TIMER_STOP('FIZHI               [FORWARD_STEP]',mythid)
767            endif
768    #endif
769    C AMM
770    
771    #ifdef ALLOW_FLT
772    C--   Calculate float trajectories
773          IF (useFLT) THEN
774            CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
775            CALL FLT_MAIN(myIter,myTime, myThid)
776            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
777          ENDIF
778    #endif
779    
780    #ifdef ALLOW_TIMEAVE
781    C--   State-variables time-averaging
782          CALL TIMER_START('DO_STATEVARS_TAVE   [FORWARD_STEP]',myThid)
783          CALL DO_STATEVARS_TAVE( myTime, myIter, myThid )
784          CALL TIMER_STOP ('DO_STATEVARS_TAVE   [FORWARD_STEP]',myThid)
785    #endif
786    
787    #ifdef ALLOW_MONITOR
788          IF ( .NOT.useOffLine ) THEN
789    C--   Check status of solution (statistics, cfl, etc...)
790            CALL TIMER_START('MONITOR             [FORWARD_STEP]',myThid)
791            CALL MONITOR( myIter, myTime, myThid )
792            CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
793          ENDIF
794    #endif /* ALLOW_MONITOR */
795    
796  c     myCurrentIter = myCurrentIter + 1  #ifdef ALLOW_COST
797  c     myCurrentTime = myCurrentTime + deltaTClock  C--     compare model with data and compute cost function
798        myCurrentIter = nIter0 + iLoop  C--     this is done after exchanges to allow interpolation
799        myCurrentTime = startTime + deltaTClock * float(iLoop)        CALL TIMER_START('COST_TILE           [FORWARD_STEP]',myThid)
800          CALL COST_TILE  ( mytime, myiter, myThid )
801          CALL TIMER_STOP ('COST_TILE           [FORWARD_STEP]',myThid)
802    #endif
803    
804    C--   Do IO if needed.
805          CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
806          CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
807          CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
808    
809    #ifdef HAVE_SIGREG
810          IF ( useSIGREG ) THEN
811            IF ( i_got_signal .GT. 0 ) THEN
812              CALL PACKAGES_WRITE_PICKUP(
813         I         .TRUE., myTime, myIter, myThid )
814              CALL WRITE_CHECKPOINT(
815         I         .TRUE., myTime, myIter, myThid )
816              STOP 'Checkpoint completed -- killed by signal handler'
817            ENDIF
818          ENDIF
819    #endif /* HAVE_SIGREG */
820    
821  C--   Save state for restarts  C--   Save state for restarts
822  C     Note:        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
823  C     =====        CALL PACKAGES_WRITE_PICKUP(
824  C     Because of the ordering of the timestepping code and       I               .FALSE., myTime, myIter, myThid )
 C     tendency term code at end of loop model arrays hold  
 C     U,V,T,S  at "time-level" N but gu, gv, gs, gt, guNM1,...  
 C     at "time-level" N+1/2 (guNM1 at "time-level" N+1/2 is  
 C     gu at "time-level" N-1/2) and cg2d_x at "time-level" N+1/2.  
 C      where N = I+timeLevBase-1  
 C     Thus a checkpoint contains U.0000000000, GU.0000000001 and  
 C     cg2d_x.0000000001 in the indexing scheme used for the model  
 C     "state" files. This example is referred to as a checkpoint  
 C     at time level 1  
       CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)  
825        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
826       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       I               .FALSE., myTime, myIter, myThid )
827        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
828    
829        ENDIF  #ifdef ALLOW_DEBUG
830          IF ( debugLevel .GE. debLevB )
831         &    CALL DEBUG_LEAVE('FORWARD_STEP',myThid)
832    #endif
833    
834        RETURN        RETURN
835        END        END
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