/[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 1.52 by jmc, Thu Apr 17 13:40:06 2003 UTC
# Line 3  C $Name$ Line 3  C $Name$
3    
4  #include "CPP_OPTIONS.h"  #include "CPP_OPTIONS.h"
5    
6        SUBROUTINE FORWARD_STEP(  CBOP
7       I                    doHalfStep, iLoop,  C     !ROUTINE: FORWARD_STEP
8       U                    myCurrentTime, myCurrentIter,  C     !INTERFACE:
9       &                    myThid)        SUBROUTINE FORWARD_STEP( iloop, myTime, myIter, myThid )
10  C     /==========================================================\  
11  C     | SUBROUTINE FORWARD_STEP                                  |  C     !DESCRIPTION: \bv
12  C     | o Does one instance of the model time stepping           |  C     *==================================================================
13  C     |   The time stepping loop in THE_MAIN_LOOP() calls        |  C     | SUBROUTINE forward_step
14  C     |   this routine                                           |  C     | o Run the ocean model and, optionally, evaluate a cost function.
15  C     |==========================================================|  C     *==================================================================
16  C     \==========================================================/  C     |
17        IMPLICIT NONE  C     | THE_MAIN_LOOP is the toplevel routine for the Tangent Linear and
18  C  C     | Adjoint Model Compiler (TAMC). For this purpose the initialization
19  C     Call Tree  C     | of the model was split into two parts. Those parameters that do
20  C     =========  C     | not depend on a specific model run are set in INITIALISE_FIXED,  
21  C      C     | whereas those that do depend on the specific realization are
22  C      THE_MAIN_LOOP()  C     | initialized in INITIALISE_VARIA.  
23  C       |  C     |
24  C  ==>  | ** Time stepping loop starts here **  C     *==================================================================
25  C  |    |  C     \ev
 C /|\   |-FORWARD_STEP  
 C  |    |  |  
 C /|\   |  |--LOAD_EXTERNAL_DATA  
 C  |    |  |   o Load and/or set time dependent forcing fields  
 C /|\   |  |  
 C  |    |  |--DYNAMICS  
 C /|\   |  |   o Evaluate "forward" terms  
 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  
26    
27  C     == Global variables ===  C     !USES:
28          IMPLICIT NONE
29    C     == Global variables ==
30  #include "SIZE.h"  #include "SIZE.h"
31  #include "EEPARAMS.h"  #include "EEPARAMS.h"
32  #include "PARAMS.h"  #include "PARAMS.h"
33  #include "DYNVARS.h"  #include "DYNVARS.h"
34  #include "CG2D.h"  #include "FFIELDS.h"
35    
36  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_NONHYDROSTATIC
37  #include "CG3D.h"  #include "CG3D.h"
38  #endif  #endif
39    
40    #ifdef ALLOW_SHAP_FILT
41    #include "SHAP_FILT.h"
42    #endif
43    #ifdef ALLOW_ZONAL_FILT
44    #include "ZONAL_FILT.h"
45    #endif
46    
47    #ifdef ALLOW_AUTODIFF_TAMC
48    # include "tamc.h"
49    # include "ctrl.h"
50    # include "ctrl_dummy.h"
51    # include "cost.h"
52    # include "EOS.h"
53    # ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
54    #  include "exf_fields.h"
55    #  if (defined (ALLOW_BULKFORMULAE) || defined (ALLOW_BULK_FORCE))
56    #   include "exf_constants.h"
57    #  endif
58    # endif
59    # ifdef ALLOW_OBCS
60    #  include "OBCS.h"
61    # endif
62    #endif
63    
64    C     !LOCAL VARIABLES:
65  C     == Routine arguments ==  C     == Routine arguments ==
66  C     doHalfStep - If .TRUE. then this is the last half step  C     note: under the multi-threaded model myiter and
67  C     iLoop         - Invocation count (counter in THE_MAIN_LOOP)  C           mytime are local variables passed around as routine
68  C     myCurrentIter - Iteration counter for this thread  C           arguments. Although this is fiddly it saves the need to
69  C     myCurrentTime - Time counter for this thread  C           impose additional synchronisation points when they are
70  C     myThid - Thread number for this instance of the routine.  C           updated.
71        LOGICAL doHalfStep  C     myiter - iteration counter for this thread
72        INTEGER iLoop  C     mytime - time counter for this thread
73        INTEGER myCurrentIter  C     mythid - thread number for this instance of the routine.
74        _RL     myCurrentTime        integer iloop
75        INTEGER myThid          integer mythid
76          integer myiter
77  C     == Local variables ==        _RL     mytime
78    #ifdef ALLOW_BULK_FORCE
79  C--   Load forcing/external data fields        INTEGER bi,bj
80        CALL TIMER_START('I/O (READ)         [FORWARD_STEP]',myThid)  #endif
       CALL EXTERNAL_FIELDS_LOAD( myCurrentTime, myCurrentIter, myThid )  
       CALL TIMER_STOP ('I/O (READ)         [FORWARD_STEP]',myThid)  
   
 C--   Step forward fields and calculate time tendency terms  
       CALL TIMER_START('DYNAMICS           [FORWARD_STEP]',myThid)  
       CALL DYNAMICS( myCurrentTime, myCurrentIter, myThid )  
       CALL TIMER_STOP ('DYNAMICS           [FORWARD_STEP]',myThid)  
81    
82  #ifdef ALLOW_NONHYDROSTATIC  CEOP
83  C--   Step forward W field in N-H algorithm  
84        IF ( nonHydrostatic ) THEN  #ifdef ALLOW_AUTODIFF_TAMC
85         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)  C--   Reset the model iteration counter and the model time.
86         CALL CALC_GW( myThid)        myiter = nIter0 + (iloop-1)
87         CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)        mytime = startTime + float(iloop-1)*deltaTclock
88    #endif
89    
90    #if (defined (ALLOW_AUTODIFF_TAMC) && defined (ALLOW_AUTODIFF_MONITOR))
91    C     Include call to a dummy routine. Its adjoint will be
92    C     called at the proper place in the adjoint code.
93    C     The adjoint routine will print out adjoint values
94    C     if requested. The location of the call is important,
95    C     it has to be after the adjoint of the exchanges
96    C     (DO_GTERM_BLOCKING_EXCHANGES).
97          CALL DUMMY_IN_STEPPING( myTime, myIter, myThid )
98    cph   I've commented this line since it may conflict with MITgcm's adjoint
99    cph   However, need to check whether that's still consistent
100    cph   with the ecco-branch (it should).
101    cph      CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
102    #endif
103    
104    #ifdef EXACT_CONSERV
105          IF (exactConserv) THEN
106    C--   Update etaH(n+1) :
107             CALL TIMER_START('UPDATE_ETAH        [FORWARD_STEP]',mythid)
108             CALL UPDATE_ETAH( myTime, myIter, myThid )
109             CALL TIMER_STOP ('UPDATE_ETAH        [FORWARD_STEP]',mythid)
110        ENDIF        ENDIF
111    #endif /* EXACT_CONSERV */
112    
113    #ifdef NONLIN_FRSURF
114          IF ( select_rStar.NE.0 ) THEN
115    C--   r* : compute the future level thickness according to etaH(n+1)
116              CALL TIMER_START('CALC_R_STAR       [FORWARD_STEP]',mythid)
117              CALL CALC_R_STAR(etaH, myTime, myIter, myThid )
118              CALL TIMER_STOP ('CALC_R_STAR       [FORWARD_STEP]',mythid)
119          ELSEIF ( nonlinFreeSurf.GT.0) THEN
120    C--   compute the future surface level thickness according to etaH(n+1)
121              CALL TIMER_START('CALC_SURF_DR      [FORWARD_STEP]',mythid)
122              CALL CALC_SURF_DR(etaH, myTime, myIter, myThid )
123              CALL TIMER_STOP ('CALC_SURF_DR      [FORWARD_STEP]',mythid)
124          ENDIF
125    #endif /* NONLIN_FRSURF */
126    
127    C--   Load forcing/external data fields.
128    #ifdef ALLOW_AUTODIFF_TAMC
129    c**************************************
130    #include "checkpoint_lev1_directives.h"
131    c**************************************
132  #endif  #endif
133    
134  #ifdef ALLOW_SHAP_FILT  
135  C--   Step forward all tiles, filter and exchange.  C--   Call external forcing package
136        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)  cswdblk -- add ---
137        CALL SHAP_FILT_APPLY(  #ifdef ALLOW_BULK_FORCE
138       I                     gUnm1, gVnm1, gTnm1, gSnm1,         CALL TIMER_START('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
139       I                     myCurrentTime, myCurrentIter, myThid )         CALL BULKF_FIELDS_LOAD( mytime, myiter, mythid )
140        CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)         CALL TIMER_STOP ('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
141    c calculate qnet and empmr (and wind stress)
142           DO bj=myByLo(myThid),myByHi(myThid)
143             DO bi=myBxLo(myThid),myBxHi(myThid)
144              CALL BULKF_FORCING( bi,bj, mytime, myiter, mythid )
145             ENDDO
146           ENDDO
147    c     Update the tile edges.
148           _EXCH_XY_R8(Qnet,   mythid)
149           _EXCH_XY_R8(EmPmR,   mythid)
150           CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)
151    C       _EXCH_XY_R8(fu     , mythid)
152    C       _EXCH_XY_R8(fv     , mythid)
153    cswdblk -- end add ---
154    #else /* ALLOW_BULK_FORCE undef */
155    # ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
156    C     NOTE, that although the exf package is part of the
157    C     distribution, it is not currently maintained, i.e.
158    C     exf is disabled by default in genmake.
159          CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
160          CALL EXF_GETFORCING( mytime, myiter, mythid )
161          CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
162    # else /* INCLUDE_EXTERNAL_FORCING_PACKAGE undef */
163    cph The following IF-statement creates an additional dependency
164    cph for the forcing fields requiring additional storing.
165    cph Therefore, the IF-statement will be put between CPP-OPTIONS,
166    cph assuming that ALLOW_SEAICE has not yet been differentiated.
167    #  ifdef ALLOW_SEAICE
168          IF ( .NOT. useSEAICE ) THEN
169    #  endif
170           CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
171           CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
172           CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
173    #  ifdef ALLOW_SEAICE
174          ENDIF
175    #  endif
176    # endif /* INCLUDE_EXTERNAL_FORCING_PACKAGE */
177    
178    #if (defined (ALLOW_ADJOINT_RUN) || defined (ALLOW_TANGENTLINEAR_RUN))
179    c--   Add control vector for forcing and parameter fields
180          if ( myiter .EQ. nIter0 )
181         &     CALL CTRL_MAP_FORCING (mythid)
182  #endif  #endif
183    
184  #ifdef ALLOW_ZONAL_FILT  # ifdef ALLOW_SEAICE
185        CALL ZONAL_FILT_APPLY(  C--   Call sea ice model to compute forcing/external data fields.  In
186       U           gUnm1, gVnm1, gTnm1, gSnm1,  C     addition to computing prognostic sea-ice variables and diagnosing the
187       I           myThid )  C     forcing/external data fields that drive the ocean model, SEAICE_MODEL
188    C     also sets theta to the freezing point under sea-ice.  The implied
189    C     surface heat flux is then stored in variable surfaceTendencyTice,
190    C     which is needed by KPP package (kpp_calc.F and kpp_transport_t.F)
191    C     to diagnose surface buoyancy fluxes and for the non-local transport
192    C     term.  Because this call precedes model thermodynamics, temperature
193    C     under sea-ice may not be "exactly" at the freezing point by the time
194    C     theta is dumped or time-averaged.
195          IF ( useSEAICE ) THEN
196             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
197             CALL SEAICE_MODEL( myTime, myIter, myThid )
198             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
199          ENDIF
200    # endif /* ALLOW_SEAICE */
201    #endif /* ALLOW_BULK_FORCE */
202    
203    C--     Step forward fields and calculate time tendency terms.
204            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
205            CALL THERMODYNAMICS( myTime, myIter, myThid )
206            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
207    
208    C--   do exchanges (needed for DYNAMICS) when using stagger time-step :
209            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
210            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
211            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
212    
213    #ifdef ALLOW_SHAP_FILT
214          IF (useSHAP_FILT .AND.
215         &     staggerTimeStep .AND. shap_filt_TrStagg ) THEN
216            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
217            CALL SHAP_FILT_APPLY_TS( gT, gS, myTime, myIter, myThid )
218            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
219          ENDIF
220  #endif  #endif
221    #ifdef ALLOW_ZONAL_FILT
222          IF (useZONAL_FILT .AND.
223         &     staggerTimeStep .AND. zonal_filt_TrStagg ) THEN
224            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
225            CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid )
226            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
227          ENDIF
228    #endif  
229    
230  C--   Do IO if needed.  C--   Step forward fields and calculate time tendency terms.
231  C     Note:        IF ( momStepping ) THEN
232  C     =====          CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
233  C     At this point model arrays hold U,V,T,S  at "time-level" N          CALL DYNAMICS( myTime, myIter, myThid )
234  C     and cg2d_x at "time-level" N-1/2 where N = I+timeLevBase-1.          CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
235  C     By convention this is taken to be the model "state".        ENDIF
       CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)  
       CALL DO_THE_MODEL_IO(  
      &        doHalfStep, myCurrentTime, myCurrentIter, myThid )  
       CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)  
236    
237    #ifdef ALLOW_NONHYDROSTATIC
238    C--   Step forward W field in N-H algorithm
239          IF ( momStepping .AND. nonHydrostatic ) THEN
240             CALL TIMER_START('CALC_GW          [FORWARD_STEP]',myThid)
241             CALL CALC_GW(myThid)
242             CALL TIMER_STOP ('CALC_GW          [FORWARD_STEP]',myThid)
243          ENDIF
244    #endif
245    
246        IF (.NOT. doHalfStep) THEN  #ifdef NONLIN_FRSURF
247    C--   update hfacC,W,S and recip_hFac according to etaH(n+1) :
248          IF ( nonlinFreeSurf.GT.0) THEN
249           IF ( select_rStar.GT.0 ) THEN
250            CALL TIMER_START('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
251            CALL UPDATE_R_STAR( myTime, myIter, myThid )
252            CALL TIMER_STOP ('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
253           ELSE
254            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
255            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
256            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
257           ENDIF
258          ENDIF
259    C-    update also CG2D matrix (and preconditioner)
260          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
261            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',myThid)
262            CALL UPDATE_CG2D( myTime, myIter, myThid )
263            CALL TIMER_STOP ('UPDATE_CG2D        [FORWARD_STEP]',myThid)
264          ENDIF
265    #endif
266    
267    C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
268    #ifdef ALLOW_SHAP_FILT
269          IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
270            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
271            CALL SHAP_FILT_APPLY_UV( gU,gV, myTime,myIter,myThid )
272            IF (implicDiv2Dflow.LT.1.) THEN
273    C--   Explicit+Implicit part of the Barotropic Flow Divergence
274    C      => Filtering of uVel,vVel is necessary
275              CALL SHAP_FILT_APPLY_UV( uVel,vVel, myTime,myIter,myThid )
276            ENDIF
277            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
278          ENDIF
279    #endif
280    #ifdef ALLOW_ZONAL_FILT
281          IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
282            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
283            CALL ZONAL_FILT_APPLY_UV( gU, gV, myThid )
284            IF (implicDiv2Dflow.LT.1.) THEN
285    C--   Explicit+Implicit part of the Barotropic Flow Divergence
286    C      => Filtering of uVel,vVel is necessary
287              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
288            ENDIF
289            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
290          ENDIF
291    #endif  
292    
293  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
294  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
295  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
296        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
297        CALL SOLVE_FOR_PRESSURE( myThid )        CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
298        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
299          CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
300          ENDIF
301    
302    #ifdef ALLOW_AUTODIFF_TAMC
303    cph This is needed because convective_adjustment calls
304    cph find_rho which may use pressure()
305    CADJ STORE totphihyd  = comlev1, key = ikey_dynamics
306    #endif
307  C--   Correct divergence in flow field and cycle time-stepping  C--   Correct divergence in flow field and cycle time-stepping
308  C     arrays (for all fields)  C     arrays (for all fields) ; update time-counter
309        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)        myIter = nIter0 + iLoop
310          myTime = startTime + deltaTClock * float(iLoop)
311          CALL TIMER_START('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
312          CALL THE_CORRECTION_STEP(myTime, myIter, myThid)
313          CALL TIMER_STOP ('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
314    
315  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
316  C     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
317  C     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
318  C     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
319    
320  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
321        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
322        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
323        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
324    
325  c     myCurrentIter = myCurrentIter + 1  #ifdef ALLOW_FLT
326  c     myCurrentTime = myCurrentTime + deltaTClock  C--   Calculate float trajectories
327        myCurrentIter = nIter0 + iLoop        IF (useFLT) THEN
328        myCurrentTime = startTime + deltaTClock * float(iLoop)          CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
329            CALL FLT_MAIN(myIter,myTime, myThid)
330            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
331          ENDIF
332    #endif
333    
334    #ifndef EXCLUDE_MONITOR
335    C--   Check status of solution (statistics, cfl, etc...)
336          CALL TIMER_START('MONITOR             [FORWARD_STEP]',myThid)
337          CALL MONITOR( myIter, myTime, myThid )
338          CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
339    #endif /* EXCLUDE_MONITOR */
340    
341    C--   Do IO if needed.
342          CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
343          CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
344          CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
345    
346  C--   Save state for restarts  C--   Save state for restarts
347  C     Note:  C     Note:    (jmc: is it still the case after ckp35 ?)
348  C     =====  C     =====
349  C     Because of the ordering of the timestepping code and  C     Because of the ordering of the timestepping code and
350  C     tendency term code at end of loop model arrays hold  C     tendency term code at end of loop model arrays hold
351  C     U,V,T,S  at "time-level" N but gu, gv, gs, gt, guNM1,...  C     U,V,T,S  at "time-level" N but gu, gv, gs, gt, guNM1,...
352  C     at "time-level" N+1/2 (guNM1 at "time-level" N+1/2 is  C     at "time-level" N+1/2 (guNM1 at "time-level" N+1/2 is
353  C     gu at "time-level" N-1/2) and cg2d_x at "time-level" N+1/2.  C     gu at "time-level" N-1/2) and etaN at "time-level" N+1/2.
354  C      where N = I+timeLevBase-1  C      where N = I+timeLevBase-1
355  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and
356  C     cg2d_x.0000000001 in the indexing scheme used for the model  C     etaN.0000000001 in the indexing scheme used for the model
357  C     "state" files. This example is referred to as a checkpoint  C     "state" files. This example is referred to as a checkpoint
358  C     at time level 1  C     at time level 1
359        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
360        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
361       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       &        .FALSE., myTime, myIter, myThid )
362        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
   
       ENDIF  
363    
       RETURN  
364        END        END
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