/[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 1.61 by heimbach, Thu Oct 2 21:33:54 2003 UTC
# Line 2  C $Header$ Line 2  C $Header$
2  C $Name$  C $Name$
3    
4  #include "CPP_OPTIONS.h"  #include "CPP_OPTIONS.h"
5    cswdptr -- add --
6    #ifdef ALLOW_GCHEM
7    # include "GCHEM_OPTIONS.h"
8    #endif
9    cswdptr -- end add ---
10    
11        SUBROUTINE FORWARD_STEP(  CBOP
12       I                    doHalfStep, iLoop,  C     !ROUTINE: FORWARD_STEP
13       U                    myCurrentTime, myCurrentIter,  C     !INTERFACE:
14       &                    myThid)        SUBROUTINE FORWARD_STEP( iloop, myTime, myIter, myThid )
15  C     /==========================================================\  
16  C     | SUBROUTINE FORWARD_STEP                                  |  C     !DESCRIPTION: \bv
17  C     | o Does one instance of the model time stepping           |  C     *==================================================================
18  C     |   The time stepping loop in THE_MAIN_LOOP() calls        |  C     | SUBROUTINE forward_step
19  C     |   this routine                                           |  C     | o Run the ocean model and, optionally, evaluate a cost function.
20  C     |==========================================================|  C     *==================================================================
21  C     \==========================================================/  C     |
22        IMPLICIT NONE  C     | THE_MAIN_LOOP is the toplevel routine for the Tangent Linear and
23  C  C     | Adjoint Model Compiler (TAMC). For this purpose the initialization
24  C     Call Tree  C     | of the model was split into two parts. Those parameters that do
25  C     =========  C     | not depend on a specific model run are set in INITIALISE_FIXED,  
26  C      C     | whereas those that do depend on the specific realization are
27  C      THE_MAIN_LOOP()  C     | initialized in INITIALISE_VARIA.  
28  C       |  C     |
29  C  ==>  | ** Time stepping loop starts here **  C     *==================================================================
30  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  
31    
32  C     == Global variables ===  C     !USES:
33          IMPLICIT NONE
34    C     == Global variables ==
35  #include "SIZE.h"  #include "SIZE.h"
36  #include "EEPARAMS.h"  #include "EEPARAMS.h"
37  #include "PARAMS.h"  #include "PARAMS.h"
38  #include "DYNVARS.h"  #include "DYNVARS.h"
39  #include "CG2D.h"  #include "FFIELDS.h"
40    
41  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_NONHYDROSTATIC
42  #include "CG3D.h"  #include "CG3D.h"
43  #endif  #endif
44    
45    #ifdef ALLOW_SHAP_FILT
46    #include "SHAP_FILT.h"
47    #endif
48    #ifdef ALLOW_ZONAL_FILT
49    #include "ZONAL_FILT.h"
50    #endif
51    
52    #ifdef ALLOW_AUTODIFF_TAMC
53    # include "tamc.h"
54    # include "ctrl.h"
55    # include "ctrl_dummy.h"
56    # include "cost.h"
57    # include "EOS.h"
58    # ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
59    #  include "exf_fields.h"
60    #  if (defined (ALLOW_BULKFORMULAE) || defined (ALLOW_BULK_FORCE))
61    #   include "exf_constants.h"
62    #  endif
63    # endif
64    # ifdef ALLOW_OBCS
65    #  include "OBCS.h"
66    # endif
67    # ifdef ALLOW_PTRACERS
68    #  include "PTRACERS.h"
69    # endif
70    #endif /* ALLOW_AUTODIFF_TAMC */
71    
72    C     !LOCAL VARIABLES:
73  C     == Routine arguments ==  C     == Routine arguments ==
74  C     doHalfStep - If .TRUE. then this is the last half step  C     note: under the multi-threaded model myiter and
75  C     iLoop         - Invocation count (counter in THE_MAIN_LOOP)  C           mytime are local variables passed around as routine
76  C     myCurrentIter - Iteration counter for this thread  C           arguments. Although this is fiddly it saves the need to
77  C     myCurrentTime - Time counter for this thread  C           impose additional synchronisation points when they are
78  C     myThid - Thread number for this instance of the routine.  C           updated.
79        LOGICAL doHalfStep  C     myiter - iteration counter for this thread
80        INTEGER iLoop  C     mytime - time counter for this thread
81        INTEGER myCurrentIter  C     mythid - thread number for this instance of the routine.
82        _RL     myCurrentTime        integer iloop
83        INTEGER myThid          integer mythid
84          integer myiter
85  C     == Local variables ==        _RL     mytime
86    #ifdef ALLOW_BULK_FORCE
87  C--   Load forcing/external data fields        INTEGER bi,bj
88        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)  
89    
90  #ifdef ALLOW_NONHYDROSTATIC  CEOP
91  C--   Step forward W field in N-H algorithm  
92        IF ( nonHydrostatic ) THEN  #ifndef DISABLE_DEBUGMODE
93         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)        IF ( debugLevel .GE. debLevB )
94         CALL CALC_GW( myThid)       &    CALL DEBUG_ENTER('FORWARD_STEP',myThid)
95         CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)  #endif
96    
97    #ifdef ALLOW_AUTODIFF_TAMC
98    C--   Reset the model iteration counter and the model time.
99          myiter = nIter0 + (iloop-1)
100          mytime = startTime + float(iloop-1)*deltaTclock
101    #endif
102    
103    #if (defined (ALLOW_AUTODIFF_TAMC) && defined (ALLOW_AUTODIFF_MONITOR))
104    C     Include call to a dummy routine. Its adjoint will be
105    C     called at the proper place in the adjoint code.
106    C     The adjoint routine will print out adjoint values
107    C     if requested. The location of the call is important,
108    C     it has to be after the adjoint of the exchanges
109    C     (DO_GTERM_BLOCKING_EXCHANGES).
110          CALL DUMMY_IN_STEPPING( myTime, myIter, myThid )
111    cph   I've commented this line since it may conflict with MITgcm's adjoint
112    cph   However, need to check whether that's still consistent
113    cph   with the ecco-branch (it should).
114    cph      CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
115    #endif
116    
117    #ifdef EXACT_CONSERV
118          IF (exactConserv) THEN
119    C--   Update etaH(n+1) :
120             CALL TIMER_START('UPDATE_ETAH        [FORWARD_STEP]',mythid)
121             CALL UPDATE_ETAH( myTime, myIter, myThid )
122             CALL TIMER_STOP ('UPDATE_ETAH        [FORWARD_STEP]',mythid)
123          ENDIF
124    #endif /* EXACT_CONSERV */
125    
126    #ifdef NONLIN_FRSURF
127          IF ( select_rStar.NE.0 ) THEN
128    C--   r* : compute the future level thickness according to etaH(n+1)
129              CALL TIMER_START('CALC_R_STAR       [FORWARD_STEP]',mythid)
130              CALL CALC_R_STAR(etaH, myTime, myIter, myThid )
131              CALL TIMER_STOP ('CALC_R_STAR       [FORWARD_STEP]',mythid)
132          ELSEIF ( nonlinFreeSurf.GT.0) THEN
133    C--   compute the future surface level thickness according to etaH(n+1)
134              CALL TIMER_START('CALC_SURF_DR      [FORWARD_STEP]',mythid)
135              CALL CALC_SURF_DR(etaH, myTime, myIter, myThid )
136              CALL TIMER_STOP ('CALC_SURF_DR      [FORWARD_STEP]',mythid)
137        ENDIF        ENDIF
138    #endif /* NONLIN_FRSURF */
139    
140    C--   Load forcing/external data fields.
141    #ifdef ALLOW_AUTODIFF_TAMC
142    c**************************************
143    #include "checkpoint_lev1_directives.h"
144    c**************************************
145  #endif  #endif
146    
147  #ifdef ALLOW_SHAP_FILT  
148  C--   Step forward all tiles, filter and exchange.  C--   Call external forcing package
149        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)  #ifdef ALLOW_BULK_FORCE
150        CALL SHAP_FILT_APPLY(  #ifndef DISABLE_DEBUGMODE
151       I                     gUnm1, gVnm1, gTnm1, gSnm1,        IF ( useBulkforce ) THEN
152       I                     myCurrentTime, myCurrentIter, myThid )         IF ( debugLevel .GE. debLevB )
153        CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)       &    CALL DEBUG_CALL('BULKF_FIELDS_LOAD',myThid)
154    #endif
155           CALL TIMER_START('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
156           CALL BULKF_FIELDS_LOAD( mytime, myiter, mythid )
157           CALL TIMER_STOP ('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
158    c calculate qnet and empmr (and wind stress)
159           DO bj=myByLo(myThid),myByHi(myThid)
160             DO bi=myBxLo(myThid),myBxHi(myThid)
161              CALL BULKF_FORCING( bi,bj, mytime, myiter, mythid )
162             ENDDO
163           ENDDO
164    c     Update the tile edges.
165           _EXCH_XY_R8(Qnet,   mythid)
166           _EXCH_XY_R8(EmPmR,   mythid)
167           CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)
168    C       _EXCH_XY_R8(fu     , mythid)
169    C       _EXCH_XY_R8(fv     , mythid)
170          END IF
171    #endif /* ALLOW_BULK_FORCE */
172    # ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
173    C     NOTE, that although the exf package is part of the
174    C     distribution, it is not currently maintained, i.e.
175    C     exf is disabled by default in genmake.
176    #ifndef DISABLE_DEBUGMODE
177          IF ( debugLevel .GE. debLevB )
178         &    CALL DEBUG_CALL('EXF_GETFORCING',myThid)
179    #endif
180          CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
181          CALL EXF_GETFORCING( mytime, myiter, mythid )
182          CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
183    # else /* INCLUDE_EXTERNAL_FORCING_PACKAGE undef */
184    cph The following IF-statement creates an additional dependency
185    cph for the forcing fields requiring additional storing.
186    cph Therefore, the IF-statement will be put between CPP-OPTIONS,
187    cph assuming that ALLOW_SEAICE has not yet been differentiated.
188    #  ifdef ALLOW_SEAICE
189          IF ( .NOT. useSEAICE ) THEN
190    #  endif
191    #ifndef DISABLE_DEBUGMODE
192           IF ( debugLevel .GE. debLevB )
193         &    CALL DEBUG_CALL('EXTERNAL_FIELDS_LOAD',myThid)
194  #endif  #endif
195           CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
196           CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
197           CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
198    #  ifdef ALLOW_SEAICE
199          ENDIF
200    #  endif
201    # endif /* INCLUDE_EXTERNAL_FORCING_PACKAGE */
202    
203    #if (defined (ALLOW_ADJOINT_RUN) || defined (ALLOW_TANGENTLINEAR_RUN))
204    c--   Add control vector for forcing and parameter fields
205          if ( myiter .EQ. nIter0 )
206         &     CALL CTRL_MAP_FORCING (mythid)
207    #endif
208    
209    # ifdef ALLOW_SEAICE
210    C--   Call sea ice model to compute forcing/external data fields.  In
211    C     addition to computing prognostic sea-ice variables and diagnosing the
212    C     forcing/external data fields that drive the ocean model, SEAICE_MODEL
213    C     also sets theta to the freezing point under sea-ice.  The implied
214    C     surface heat flux is then stored in variable surfaceTendencyTice,
215    C     which is needed by KPP package (kpp_calc.F and kpp_transport_t.F)
216    C     to diagnose surface buoyancy fluxes and for the non-local transport
217    C     term.  Because this call precedes model thermodynamics, temperature
218    C     under sea-ice may not be "exactly" at the freezing point by the time
219    C     theta is dumped or time-averaged.
220          IF ( useSEAICE ) THEN
221    #ifndef DISABLE_DEBUGMODE
222             IF ( debugLevel .GE. debLevB )
223         &    CALL DEBUG_CALL('SEAICE_MODEL',myThid)
224    #endif
225             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
226             CALL SEAICE_MODEL( myTime, myIter, myThid )
227             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
228          ENDIF
229    # endif /* ALLOW_SEAICE */
230    
231    #ifdef ALLOW_AUTODIFF_TAMC
232    # ifdef ALLOW_PTRACERS
233    cph this replaces _bibj storing of ptracer within thermodynamics
234    CADJ STORE ptracer  = comlev1, key = ikey_dynamics
235    # endif
236    #endif
237    C--     Step forward fields and calculate time tendency terms.
238    #ifndef DISABLE_DEBUGMODE
239          IF ( debugLevel .GE. debLevB )
240         &    CALL DEBUG_CALL('THERMODYNAMICS',myThid)
241    #endif
242            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
243            CALL THERMODYNAMICS( myTime, myIter, myThid )
244            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
245    
246    C--   do exchanges (needed for DYNAMICS) when using stagger time-step :
247    #ifndef DISABLE_DEBUGMODE
248          IF ( debugLevel .GE. debLevB )
249         &    CALL DEBUG_CALL('DO_STAGGER_FIELDS_EXCH.',myThid)
250    #endif
251            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
252            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
253            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
254    
255    #ifdef ALLOW_SHAP_FILT
256          IF (useSHAP_FILT .AND.
257         &     staggerTimeStep .AND. shap_filt_TrStagg ) THEN
258    #ifndef DISABLE_DEBUGMODE
259            IF ( debugLevel .GE. debLevB )
260         &    CALL DEBUG_CALL('SHAP_FILT_APPLY_TS',myThid)
261    #endif
262            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
263            CALL SHAP_FILT_APPLY_TS(gT,gS,myTime+deltaT,myIter+1,myThid)
264            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
265          ENDIF
266    #endif
267  #ifdef ALLOW_ZONAL_FILT  #ifdef ALLOW_ZONAL_FILT
268        CALL ZONAL_FILT_APPLY(        IF (useZONAL_FILT .AND.
269       U           gUnm1, gVnm1, gTnm1, gSnm1,       &     staggerTimeStep .AND. zonal_filt_TrStagg ) THEN
270       I           myThid )  #ifndef DISABLE_DEBUGMODE
271            IF ( debugLevel .GE. debLevB )
272         &    CALL DEBUG_CALL('ZONAL_FILT_APPLY_TS',myThid)
273  #endif  #endif
274            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
275            CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid )
276            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
277          ENDIF
278    #endif  
279    
280  C--   Do IO if needed.  C--   Step forward fields and calculate time tendency terms.
281  C     Note:  #ifndef ALLOW_AUTODIFF_TAMC
282  C     =====        IF ( momStepping ) THEN
283  C     At this point model arrays hold U,V,T,S  at "time-level" N  #endif
284  C     and cg2d_x at "time-level" N-1/2 where N = I+timeLevBase-1.  #ifndef DISABLE_DEBUGMODE
285  C     By convention this is taken to be the model "state".          IF ( debugLevel .GE. debLevB )
286        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)       &    CALL DEBUG_CALL('DYNAMICS',myThid)
287        CALL DO_THE_MODEL_IO(  #endif
288       &        doHalfStep, myCurrentTime, myCurrentIter, myThid )          CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
289        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)          CALL DYNAMICS( myTime, myIter, myThid )
290            CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
291    #ifndef ALLOW_AUTODIFF_TAMC
292          ENDIF
293    #endif
294    
295    #ifdef ALLOW_NONHYDROSTATIC
296    C--   Step forward W field in N-H algorithm
297          IF ( momStepping .AND. nonHydrostatic ) THEN
298    #ifndef DISABLE_DEBUGMODE
299              IF ( debugLevel .GE. debLevB )
300         &     CALL DEBUG_CALL('CALC_GW',myThid)
301    #endif
302             CALL TIMER_START('CALC_GW          [FORWARD_STEP]',myThid)
303             CALL CALC_GW(myThid)
304             CALL TIMER_STOP ('CALC_GW          [FORWARD_STEP]',myThid)
305          ENDIF
306    #endif
307    
308        IF (.NOT. doHalfStep) THEN  #ifdef NONLIN_FRSURF
309    C--   update hfacC,W,S and recip_hFac according to etaH(n+1) :
310          IF ( nonlinFreeSurf.GT.0) THEN
311           IF ( select_rStar.GT.0 ) THEN
312            CALL TIMER_START('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
313            CALL UPDATE_R_STAR( myTime, myIter, myThid )
314            CALL TIMER_STOP ('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
315           ELSE
316            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
317            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
318            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
319           ENDIF
320          ENDIF
321    C-    update also CG2D matrix (and preconditioner)
322          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
323            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',myThid)
324            CALL UPDATE_CG2D( myTime, myIter, myThid )
325            CALL TIMER_STOP ('UPDATE_CG2D        [FORWARD_STEP]',myThid)
326          ENDIF
327    #endif
328    
329    C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
330    #ifdef ALLOW_SHAP_FILT
331          IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
332            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
333            IF (implicDiv2Dflow.LT.1.) THEN
334    C--   Explicit+Implicit part of the Barotropic Flow Divergence
335    C      => Filtering of uVel,vVel is necessary
336              CALL SHAP_FILT_APPLY_UV( uVel,vVel,
337         &                             myTime+deltaT, myIter+1, myThid )
338            ENDIF
339            CALL SHAP_FILT_APPLY_UV( gU,gV,myTime+deltaT,myIter+1,myThid)
340            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
341          ENDIF
342    #endif
343    #ifdef ALLOW_ZONAL_FILT
344          IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
345            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
346            IF (implicDiv2Dflow.LT.1.) THEN
347    C--   Explicit+Implicit part of the Barotropic Flow Divergence
348    C      => Filtering of uVel,vVel is necessary
349              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
350            ENDIF
351            CALL ZONAL_FILT_APPLY_UV( gU, gV, myThid )
352            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
353          ENDIF
354    #endif  
355    
356  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
357  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
358  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
359        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
360        CALL SOLVE_FOR_PRESSURE( myThid )        CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
361        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
362          CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
363          ENDIF
364    
365    #ifdef ALLOW_AUTODIFF_TAMC
366    cph This is needed because convective_adjustment calls
367    cph find_rho which may use pressure()
368    CADJ STORE totphihyd  = comlev1, key = ikey_dynamics
369    #endif
370  C--   Correct divergence in flow field and cycle time-stepping  C--   Correct divergence in flow field and cycle time-stepping
371  C     arrays (for all fields)  C     arrays (for all fields) ; update time-counter
372        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)        myIter = nIter0 + iLoop
373          myTime = startTime + deltaTClock * float(iLoop)
374          CALL TIMER_START('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
375          CALL THE_CORRECTION_STEP(myTime, myIter, myThid)
376          CALL TIMER_STOP ('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
377    
378  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
379  C     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
380  C     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
381  C     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
382    
383  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
384        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
385        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
386        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
387    
388    cswdptr -- add for seperate timestepping of chemical/biological/forcing
389    cswdptr    of ptracers ---
390    #ifdef ALLOW_GCHEM
391    #ifdef PTRACERS_SEPERATE_FORCING
392            call GCHEM_FORCING( myTime,myIter,myThid )
393    #endif
394    #endif
395    cswdptr -- end add ---
396    
397    
398    #ifdef ALLOW_FLT
399    C--   Calculate float trajectories
400          IF (useFLT) THEN
401            CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
402            CALL FLT_MAIN(myIter,myTime, myThid)
403            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
404          ENDIF
405    #endif
406    
407  c     myCurrentIter = myCurrentIter + 1  #ifndef EXCLUDE_MONITOR
408  c     myCurrentTime = myCurrentTime + deltaTClock  C--   Check status of solution (statistics, cfl, etc...)
409        myCurrentIter = nIter0 + iLoop        CALL TIMER_START('MONITOR             [FORWARD_STEP]',myThid)
410        myCurrentTime = startTime + deltaTClock * float(iLoop)        CALL MONITOR( myIter, myTime, myThid )
411          CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
412    #endif /* EXCLUDE_MONITOR */
413    
414    C--   Do IO if needed.
415          CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
416          CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
417          CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
418    
419  C--   Save state for restarts  C--   Save state for restarts
420  C     Note:  C     Note:    (jmc: is it still the case after ckp35 ?)
421  C     =====  C     =====
422  C     Because of the ordering of the timestepping code and  C     Because of the ordering of the timestepping code and
423  C     tendency term code at end of loop model arrays hold  C     tendency term code at end of loop model arrays hold
424  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,...
425  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
426  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.
427  C      where N = I+timeLevBase-1  C      where N = I+timeLevBase-1
428  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and
429  C     cg2d_x.0000000001 in the indexing scheme used for the model  C     etaN.0000000001 in the indexing scheme used for the model
430  C     "state" files. This example is referred to as a checkpoint  C     "state" files. This example is referred to as a checkpoint
431  C     at time level 1  C     at time level 1
432        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
433        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
434       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       &        .FALSE., myTime, myIter, myThid )
435        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
436    
437        ENDIF  #ifndef DISABLE_DEBUGMODE
438          IF ( debugLevel .GE. debLevB )
439         &    CALL DEBUG_LEAVE('FORWARD_STEP',myThid)
440    #endif
441    
       RETURN  
442        END        END
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