/[MITgcm]/MITgcm/model/src/forward_step.F
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revision 1.10 by jmc, Tue Mar 6 16:51:02 2001 UTC revision 1.64 by edhill, Thu Oct 9 04:19:18 2003 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(  cswdptr -- add --
8       I                    iLoop,  #ifdef ALLOW_GCHEM
9       U                    myCurrentTime, myCurrentIter,  # include "GCHEM_OPTIONS.h"
10       &                    myThid)  #endif
11  C     /==========================================================\  cswdptr -- end add ---
12  C     | SUBROUTINE FORWARD_STEP                                  |  
13  C     | o Does one instance of the model time stepping           |  CBOP
14  C     |   The time stepping loop in THE_MAIN_LOOP() calls        |  C     !ROUTINE: FORWARD_STEP
15  C     |   this routine                                           |  C     !INTERFACE:
16  C     |==========================================================|        SUBROUTINE FORWARD_STEP( iloop, myTime, myIter, myThid )
17  C     \==========================================================/  
18        IMPLICIT NONE  C     !DESCRIPTION: \bv
19  C  C     *==================================================================
20  C     Call Tree  C     | SUBROUTINE forward_step
21  C     =========  C     | o Run the ocean model and, optionally, evaluate a cost function.
22  C      C     *==================================================================
23  C      THE_MAIN_LOOP()  C     |
24  C       |  C     | THE_MAIN_LOOP is the toplevel routine for the Tangent Linear and
25  C  ==>  | ** Time stepping loop starts here **  C     | Adjoint Model Compiler (TAMC). For this purpose the initialization
26  C  |    |  C     | of the model was split into two parts. Those parameters that do
27  C /|\   |-FORWARD_STEP  C     | not depend on a specific model run are set in INITIALISE_FIXED,  
28  C  |    |  |  C     | whereas those that do depend on the specific realization are
29  C /|\   |  |--LOAD_EXTERNAL_DATA  C     | initialized in INITIALISE_VARIA.  
30  C  |    |  |   o Load and/or set time dependent forcing fields  C     |
31  C /|\   |  |  C     *==================================================================
32  C  |    |  |--DYNAMICS  C     \ev
 C /|\   |  |   o Evaluate "forward" terms  
 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  |    |  |--DO_THE_MODEL_IO  
 C /|\   |  |   o Write model state  
 C  |    |  |  
 C /|\   |  |  
 C  |    |  |--WRITE_CHECKPOINT  
 C /|\   |  |   o Write restart file(s)  
 C  |    |  
 C /|\   |  
 C  |<== | ** Time stepping loop finishes here **  
 C  
33    
34  C     == Global variables ===  C     !USES:
35          IMPLICIT NONE
36    C     == Global variables ==
37  #include "SIZE.h"  #include "SIZE.h"
38  #include "EEPARAMS.h"  #include "EEPARAMS.h"
39  #include "PARAMS.h"  #include "PARAMS.h"
40  #include "DYNVARS.h"  #include "DYNVARS.h"
41    #include "FFIELDS.h"
42    
43  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_NONHYDROSTATIC
44  #include "CG3D.h"  #include "CG3D.h"
45  #endif  #endif
46    
47    #ifdef ALLOW_SHAP_FILT
48    #include "SHAP_FILT.h"
49    #endif
50    #ifdef ALLOW_ZONAL_FILT
51    #include "ZONAL_FILT.h"
52    #endif
53    
54    #ifdef ALLOW_AUTODIFF_TAMC
55    # include "tamc.h"
56    # include "ctrl.h"
57    # include "ctrl_dummy.h"
58    # include "cost.h"
59    # include "EOS.h"
60    # ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
61    #  include "exf_fields.h"
62    #  ifdef ALLOW_BULKFORMULAE
63    #   include "exf_constants.h"
64    #  endif
65    # endif
66    # ifdef ALLOW_OBCS
67    #  include "OBCS.h"
68    # endif
69    # ifdef ALLOW_PTRACERS
70    #  include "PTRACERS.h"
71    # endif
72    #endif /* ALLOW_AUTODIFF_TAMC */
73    
74    C     !LOCAL VARIABLES:
75  C     == Routine arguments ==  C     == Routine arguments ==
76  C     iLoop         - Invocation count (counter in THE_MAIN_LOOP)  C     note: under the multi-threaded model myiter and
77  C     myCurrentIter - Iteration counter for this thread  C           mytime are local variables passed around as routine
78  C     myCurrentTime - Time counter for this thread  C           arguments. Although this is fiddly it saves the need to
79  C     myThid - Thread number for this instance of the routine.  C           impose additional synchronisation points when they are
80        INTEGER iLoop  C           updated.
81        INTEGER myCurrentIter  C     myiter - iteration counter for this thread
82        _RL     myCurrentTime  C     mytime - time counter for this thread
83        INTEGER myThid    C     mythid - thread number for this instance of the routine.
84          integer iloop
85  C     == Local variables ==        integer mythid
86          integer myiter
87  C--   Load forcing/external data fields        _RL     mytime
88        CALL TIMER_START('I/O (READ)         [FORWARD_STEP]',myThid)  #ifdef ALLOW_BULK_FORCE
89        CALL EXTERNAL_FIELDS_LOAD( myCurrentTime, myCurrentIter, myThid )        INTEGER bi,bj
90        CALL TIMER_STOP ('I/O (READ)         [FORWARD_STEP]',myThid)  #endif
91    
92  C--   Step forward fields and calculate time tendency terms  CEOP
93        CALL TIMER_START('DYNAMICS           [FORWARD_STEP]',myThid)  
94        CALL DYNAMICS( myCurrentTime, myCurrentIter, myThid )  #ifndef DISABLE_DEBUGMODE
95        CALL TIMER_STOP ('DYNAMICS           [FORWARD_STEP]',myThid)        IF ( debugLevel .GE. debLevB )
96         &    CALL DEBUG_ENTER('FORWARD_STEP',myThid)
97    #endif
98    
99    #ifdef ALLOW_AUTODIFF_TAMC
100    C--   Reset the model iteration counter and the model time.
101          myiter = nIter0 + (iloop-1)
102          mytime = startTime + float(iloop-1)*deltaTclock
103    #endif
104    
105    #if (defined (ALLOW_AUTODIFF_TAMC) && defined (ALLOW_AUTODIFF_MONITOR))
106    C     Include call to a dummy routine. Its adjoint will be
107    C     called at the proper place in the adjoint code.
108    C     The adjoint routine will print out adjoint values
109    C     if requested. The location of the call is important,
110    C     it has to be after the adjoint of the exchanges
111    C     (DO_GTERM_BLOCKING_EXCHANGES).
112          CALL DUMMY_IN_STEPPING( myTime, myIter, myThid )
113    cph   I've commented this line since it may conflict with MITgcm's adjoint
114    cph   However, need to check whether that's still consistent
115    cph   with the ecco-branch (it should).
116    cph      CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
117    #endif
118    
119    #ifdef EXACT_CONSERV
120          IF (exactConserv) THEN
121    C--   Update etaH(n+1) :
122             CALL TIMER_START('UPDATE_ETAH        [FORWARD_STEP]',mythid)
123             CALL UPDATE_ETAH( myTime, myIter, myThid )
124             CALL TIMER_STOP ('UPDATE_ETAH        [FORWARD_STEP]',mythid)
125          ENDIF
126    #endif /* EXACT_CONSERV */
127    
128    #ifdef NONLIN_FRSURF
129          IF ( select_rStar.NE.0 ) THEN
130    C--   r* : compute the future level thickness according to etaH(n+1)
131              CALL TIMER_START('CALC_R_STAR       [FORWARD_STEP]',mythid)
132              CALL CALC_R_STAR(etaH, myTime, myIter, myThid )
133              CALL TIMER_STOP ('CALC_R_STAR       [FORWARD_STEP]',mythid)
134          ELSEIF ( nonlinFreeSurf.GT.0) THEN
135    C--   compute the future surface level thickness according to etaH(n+1)
136              CALL TIMER_START('CALC_SURF_DR      [FORWARD_STEP]',mythid)
137              CALL CALC_SURF_DR(etaH, myTime, myIter, myThid )
138              CALL TIMER_STOP ('CALC_SURF_DR      [FORWARD_STEP]',mythid)
139          ENDIF
140    #endif /* NONLIN_FRSURF */
141    
142    C--   Load forcing/external data fields.
143    #ifdef ALLOW_AUTODIFF_TAMC
144    c**************************************
145    #include "checkpoint_lev1_directives.h"
146    c**************************************
147    #endif
148    
149    
150    C--   Call external forcing package
151    #ifdef ALLOW_BULK_FORCE
152          IF ( useBulkforce ) THEN
153    #ifndef DISABLE_DEBUGMODE
154           IF ( debugLevel .GE. debLevB )
155         &    CALL DEBUG_CALL('BULKF_FIELDS_LOAD',myThid)
156    #endif
157           CALL TIMER_START('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
158           CALL BULKF_FIELDS_LOAD( mytime, myiter, mythid )
159           CALL TIMER_STOP ('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
160    c calculate qnet and empmr (and wind stress)
161           DO bj=myByLo(myThid),myByHi(myThid)
162             DO bi=myBxLo(myThid),myBxHi(myThid)
163              CALL BULKF_FORCING( bi,bj, mytime, myiter, mythid )
164             ENDDO
165           ENDDO
166    c     Update the tile edges.
167           _EXCH_XY_R8(Qnet,   mythid)
168           _EXCH_XY_R8(EmPmR,   mythid)
169           CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)
170    C       _EXCH_XY_R8(fu     , mythid)
171    C       _EXCH_XY_R8(fv     , mythid)
172          ELSE
173    #endif /* ALLOW_BULK_FORCE */
174    
175    # ifdef ALLOW_EXF
176    C     NOTE, that although the exf package is part of the
177    C     distribution, it is not currently maintained, i.e.
178    C     exf is disabled by default in genmake.
179    #ifndef DISABLE_DEBUGMODE
180          IF ( debugLevel .GE. debLevB )
181         &    CALL DEBUG_CALL('EXF_GETFORCING',myThid)
182    #endif
183          CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
184          CALL EXF_GETFORCING( mytime, myiter, mythid )
185          CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
186    # else /* ALLOW_EXF undef */
187    cph The following IF-statement creates an additional dependency
188    cph for the forcing fields requiring additional storing.
189    cph Therefore, the IF-statement will be put between CPP-OPTIONS,
190    cph assuming that ALLOW_SEAICE has not yet been differentiated.
191    #  ifdef ALLOW_SEAICE
192          IF ( .NOT. useSEAICE ) THEN
193    #  endif
194    #ifndef DISABLE_DEBUGMODE
195           IF ( debugLevel .GE. debLevB )
196         &    CALL DEBUG_CALL('EXTERNAL_FIELDS_LOAD',myThid)
197    #endif
198           CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
199           CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
200           CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
201    #  ifdef ALLOW_SEAICE
202          ENDIF
203    #  endif
204    # endif /* ALLOW_EXF */
205    #ifdef ALLOW_BULK_FORCE
206    C--   end of if/else block useBulfforce --
207          ENDIF
208    #endif /* ALLOW_BULK_FORCE */
209    
210    #if (defined (ALLOW_ADJOINT_RUN) || defined (ALLOW_TANGENTLINEAR_RUN))
211    c--   Add control vector for forcing and parameter fields
212          if ( myiter .EQ. nIter0 )
213         &     CALL CTRL_MAP_FORCING (mythid)
214    #endif
215    
216    # ifdef ALLOW_SEAICE
217    C--   Call sea ice model to compute forcing/external data fields.  In
218    C     addition to computing prognostic sea-ice variables and diagnosing the
219    C     forcing/external data fields that drive the ocean model, SEAICE_MODEL
220    C     also sets theta to the freezing point under sea-ice.  The implied
221    C     surface heat flux is then stored in variable surfaceTendencyTice,
222    C     which is needed by KPP package (kpp_calc.F and kpp_transport_t.F)
223    C     to diagnose surface buoyancy fluxes and for the non-local transport
224    C     term.  Because this call precedes model thermodynamics, temperature
225    C     under sea-ice may not be "exactly" at the freezing point by the time
226    C     theta is dumped or time-averaged.
227          IF ( useSEAICE ) THEN
228    #ifndef DISABLE_DEBUGMODE
229             IF ( debugLevel .GE. debLevB )
230         &    CALL DEBUG_CALL('SEAICE_MODEL',myThid)
231    #endif
232             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
233             CALL SEAICE_MODEL( myTime, myIter, myThid )
234             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
235          ENDIF
236    # endif /* ALLOW_SEAICE */
237    
238    #ifdef ALLOW_AUTODIFF_TAMC
239    # ifdef ALLOW_PTRACERS
240    cph this replaces _bibj storing of ptracer within thermodynamics
241    CADJ STORE ptracer  = comlev1, key = ikey_dynamics
242    # endif
243    #endif
244    
245    #ifdef ALLOW_PTRACERS
246    # ifdef ALLOW_GCHEM
247             CALL GCHEM_FIELDS_LOAD( mytime, myiter, mythid )
248    # endif
249    #endif
250    
251    C--     Step forward fields and calculate time tendency terms.
252    #ifndef DISABLE_DEBUGMODE
253          IF ( debugLevel .GE. debLevB )
254         &    CALL DEBUG_CALL('THERMODYNAMICS',myThid)
255    #endif
256            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
257            CALL THERMODYNAMICS( myTime, myIter, myThid )
258            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
259    
260    C--   do exchanges (needed for DYNAMICS) when using stagger time-step :
261    #ifndef DISABLE_DEBUGMODE
262          IF ( debugLevel .GE. debLevB )
263         &    CALL DEBUG_CALL('DO_STAGGER_FIELDS_EXCH.',myThid)
264    #endif
265            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
266            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
267            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
268    
269    #ifdef ALLOW_SHAP_FILT
270          IF (useSHAP_FILT .AND.
271         &     staggerTimeStep .AND. shap_filt_TrStagg ) THEN
272    #ifndef DISABLE_DEBUGMODE
273            IF ( debugLevel .GE. debLevB )
274         &    CALL DEBUG_CALL('SHAP_FILT_APPLY_TS',myThid)
275    #endif
276            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
277            CALL SHAP_FILT_APPLY_TS(gT,gS,myTime+deltaT,myIter+1,myThid)
278            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
279          ENDIF
280    #endif
281    #ifdef ALLOW_ZONAL_FILT
282          IF (useZONAL_FILT .AND.
283         &     staggerTimeStep .AND. zonal_filt_TrStagg ) THEN
284    #ifndef DISABLE_DEBUGMODE
285            IF ( debugLevel .GE. debLevB )
286         &    CALL DEBUG_CALL('ZONAL_FILT_APPLY_TS',myThid)
287    #endif
288            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
289            CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid )
290            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
291          ENDIF
292    #endif  
293    
294    C--   Step forward fields and calculate time tendency terms.
295    #ifndef ALLOW_AUTODIFF_TAMC
296          IF ( momStepping ) THEN
297    #endif
298    #ifndef DISABLE_DEBUGMODE
299            IF ( debugLevel .GE. debLevB )
300         &    CALL DEBUG_CALL('DYNAMICS',myThid)
301    #endif
302            CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
303            CALL DYNAMICS( myTime, myIter, myThid )
304            CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
305    #ifndef ALLOW_AUTODIFF_TAMC
306          ENDIF
307    #endif
308    
309  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_NONHYDROSTATIC
310  C--   Step forward W field in N-H algorithm  C--   Step forward W field in N-H algorithm
311        IF ( nonHydrostatic ) THEN        IF ( momStepping .AND. nonHydrostatic ) THEN
312         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)  #ifndef DISABLE_DEBUGMODE
313         CALL CALC_GW( myThid)            IF ( debugLevel .GE. debLevB )
314         CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)       &     CALL DEBUG_CALL('CALC_GW',myThid)
315    #endif
316             CALL TIMER_START('CALC_GW          [FORWARD_STEP]',myThid)
317             CALL CALC_GW(myThid)
318             CALL TIMER_STOP ('CALC_GW          [FORWARD_STEP]',myThid)
319        ENDIF        ENDIF
320  #endif  #endif
321    
322    #ifdef NONLIN_FRSURF
323    C--   update hfacC,W,S and recip_hFac according to etaH(n+1) :
324          IF ( nonlinFreeSurf.GT.0) THEN
325           IF ( select_rStar.GT.0 ) THEN
326            CALL TIMER_START('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
327            CALL UPDATE_R_STAR( myTime, myIter, myThid )
328            CALL TIMER_STOP ('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
329           ELSE
330            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
331            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
332            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
333           ENDIF
334          ENDIF
335    C-    update also CG2D matrix (and preconditioner)
336          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
337            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',myThid)
338            CALL UPDATE_CG2D( myTime, myIter, myThid )
339            CALL TIMER_STOP ('UPDATE_CG2D        [FORWARD_STEP]',myThid)
340          ENDIF
341    #endif
342    
343    C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
344  #ifdef ALLOW_SHAP_FILT  #ifdef ALLOW_SHAP_FILT
345  C--   Step forward all tiles, filter and exchange.        IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
346        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)          CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
347        CALL SHAP_FILT_APPLY(          IF (implicDiv2Dflow.LT.1.) THEN
      I                     gUnm1, gVnm1, gTnm1, gSnm1,  
      I                     myCurrentTime, myCurrentIter, myThid )  
       IF (implicDiv2Dflow.LT.1.) THEN  
348  C--   Explicit+Implicit part of the Barotropic Flow Divergence  C--   Explicit+Implicit part of the Barotropic Flow Divergence
349  C      => Filtering of uVel,vVel is necessary  C      => Filtering of uVel,vVel is necessary
350           CALL SHAP_FILT_UV( uVel, vVel, myCurrentTime, myThid )            CALL SHAP_FILT_APPLY_UV( uVel,vVel,
351         &                             myTime+deltaT, myIter+1, myThid )
352            ENDIF
353            CALL SHAP_FILT_APPLY_UV( gU,gV,myTime+deltaT,myIter+1,myThid)
354            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
355        ENDIF        ENDIF
       CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)  
356  #endif  #endif
   
357  #ifdef ALLOW_ZONAL_FILT  #ifdef ALLOW_ZONAL_FILT
358        IF (zonal_filt_lat.LT.90.) THEN        IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
359        CALL ZONAL_FILT_APPLY(          CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
360       U           gUnm1, gVnm1, gTnm1, gSnm1,          IF (implicDiv2Dflow.LT.1.) THEN
361       I           myThid )  C--   Explicit+Implicit part of the Barotropic Flow Divergence
362    C      => Filtering of uVel,vVel is necessary
363              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
364            ENDIF
365            CALL ZONAL_FILT_APPLY_UV( gU, gV, myThid )
366            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
367        ENDIF        ENDIF
368  #endif  #endif  
369    
370  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
371  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
372  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
373        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
374        CALL SOLVE_FOR_PRESSURE( myThid )        CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
375        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
376          CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
377          ENDIF
378    
379    #ifdef ALLOW_AUTODIFF_TAMC
380    cph This is needed because convective_adjustment calls
381    cph find_rho which may use pressure()
382    CADJ STORE totphihyd  = comlev1, key = ikey_dynamics
383    #endif
384  C--   Correct divergence in flow field and cycle time-stepping  C--   Correct divergence in flow field and cycle time-stepping
385  C     arrays (for all fields) ; update time-counter  C     arrays (for all fields) ; update time-counter
386        myCurrentIter = nIter0 + iLoop        myIter = nIter0 + iLoop
387        myCurrentTime = startTime + deltaTClock * float(iLoop)        myTime = startTime + deltaTClock * float(iLoop)
388        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)        CALL TIMER_START('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
389          CALL THE_CORRECTION_STEP(myTime, myIter, myThid)
390          CALL TIMER_STOP ('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
391    
392  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
393  c     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
394  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
395  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
396    
397  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
398        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
399        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
400        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
401    
402    cswdptr -- add for seperate timestepping of chemical/biological/forcing
403    cswdptr    of ptracers ---
404    #ifdef ALLOW_GCHEM
405    ceh3 This is broken -- this ifdef should not be visible!
406    #ifdef PTRACERS_SEPARATE_FORCING
407    ceh3 needs an IF ( use GCHEM ) THEN
408            call GCHEM_FORCING_SEP( myTime,myIter,myThid )
409    #endif /* PTRACERS_SEPARATE_FORCING */
410    #endif /* ALLOW_GCHEM */
411    cswdptr -- end add ---
412    
413    
414    #ifdef ALLOW_FLT
415    C--   Calculate float trajectories
416          IF (useFLT) THEN
417            CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
418            CALL FLT_MAIN(myIter,myTime, myThid)
419            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
420          ENDIF
421    #endif
422    
423    #ifndef EXCLUDE_MONITOR
424    C--   Check status of solution (statistics, cfl, etc...)
425          CALL TIMER_START('MONITOR             [FORWARD_STEP]',myThid)
426          CALL MONITOR( myIter, myTime, myThid )
427          CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
428    #endif /* EXCLUDE_MONITOR */
429    
430  C--   Do IO if needed.  C--   Do IO if needed.
431        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
432        CALL DO_THE_MODEL_IO(.FALSE.,        CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
433       &                     myCurrentTime, myCurrentIter, myThid )        CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
       CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)  
434    
435  C--   Save state for restarts  C--   Save state for restarts
436  C     Note:    (jmc: is it still the case after ckp35 ?)  C     Note:    (jmc: is it still the case after ckp35 ?)
# Line 159  C     Thus a checkpoint contains U.00000 Line 445  C     Thus a checkpoint contains U.00000
445  C     etaN.0000000001 in the indexing scheme used for the model  C     etaN.0000000001 in the indexing scheme used for the model
446  C     "state" files. This example is referred to as a checkpoint  C     "state" files. This example is referred to as a checkpoint
447  C     at time level 1  C     at time level 1
448        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
449        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
450       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       &        .FALSE., myTime, myIter, myThid )
451        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
452    
453    #ifndef DISABLE_DEBUGMODE
454          IF ( debugLevel .GE. debLevB )
455         &    CALL DEBUG_LEAVE('FORWARD_STEP',myThid)
456    #endif
457    
       RETURN  
458        END        END
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