/[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 1.72 by heimbach, Thu Nov 6 22:01:43 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 ALLOW_EXF
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 )  #ifdef ALLOW_DEBUG
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    #ifdef ALLOW_AUTODIFF_TAMC
143    c**************************************
144    #include "checkpoint_lev1_directives.h"
145    c**************************************
146    #endif
147    
148    C--   Call external forcing package
149    #ifdef ALLOW_BULK_FORCE
150          IF ( useBulkforce ) THEN
151    #ifdef ALLOW_DEBUG
152           IF ( debugLevel .GE. debLevB )
153         &    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          ELSE
171    #endif /* ALLOW_BULK_FORCE */
172    
173    # ifdef ALLOW_EXF
174    #  ifdef ALLOW_DEBUG
175          IF ( debugLevel .GE. debLevB )
176         &    CALL DEBUG_CALL('EXF_GETFORCING',myThid)
177    #  endif
178          CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
179          CALL EXF_GETFORCING( mytime, myiter, mythid )
180          CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
181    # else /* ALLOW_EXF undef */
182    cph The following IF-statement creates an additional dependency
183    cph for the forcing fields requiring additional storing.
184    cph Therefore, the IF-statement will be put between CPP-OPTIONS,
185    cph assuming that ALLOW_SEAICE has not yet been differentiated.
186    #  ifdef ALLOW_SEAICE
187          IF ( .NOT. useSEAICE ) THEN
188    #  endif
189    #ifdef ALLOW_DEBUG
190           IF ( debugLevel .GE. debLevB )
191         &    CALL DEBUG_CALL('EXTERNAL_FIELDS_LOAD',myThid)
192    #endif
193           CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
194           CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
195           CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
196    #  ifdef ALLOW_SEAICE
197          ENDIF
198    #  endif
199    # endif /* ALLOW_EXF */
200    #ifdef ALLOW_BULK_FORCE
201    C--   end of if/else block useBulfforce --
202          ENDIF
203    #endif /* ALLOW_BULK_FORCE */
204    
205    #ifdef ALLOW_AUTODIFF
206    c--   Add control vector for forcing and parameter fields
207          if ( myiter .EQ. nIter0 )
208         &     CALL CTRL_MAP_FORCING (mythid)
209    #endif
210    
211    # ifdef ALLOW_SEAICE
212    C--   Call sea ice model to compute forcing/external data fields.  In
213    C     addition to computing prognostic sea-ice variables and diagnosing the
214    C     forcing/external data fields that drive the ocean model, SEAICE_MODEL
215    C     also sets theta to the freezing point under sea-ice.  The implied
216    C     surface heat flux is then stored in variable surfaceTendencyTice,
217    C     which is needed by KPP package (kpp_calc.F and kpp_transport_t.F)
218    C     to diagnose surface buoyancy fluxes and for the non-local transport
219    C     term.  Because this call precedes model thermodynamics, temperature
220    C     under sea-ice may not be "exactly" at the freezing point by the time
221    C     theta is dumped or time-averaged.
222          IF ( useSEAICE ) THEN
223    #ifdef ALLOW_DEBUG
224             IF ( debugLevel .GE. debLevB )
225         &    CALL DEBUG_CALL('SEAICE_MODEL',myThid)
226    #endif
227             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
228             CALL SEAICE_MODEL( myTime, myIter, myThid )
229             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
230          ENDIF
231    # endif /* ALLOW_SEAICE */
232    
233    #ifdef ALLOW_AUTODIFF_TAMC
234    # ifdef ALLOW_PTRACERS
235    cph this replaces _bibj storing of ptracer within thermodynamics
236    CADJ STORE ptracer  = comlev1, key = ikey_dynamics
237    # endif
238    #endif
239    
240    #ifdef ALLOW_PTRACERS
241    # ifdef ALLOW_GCHEM
242             CALL GCHEM_FIELDS_LOAD( mytime, myiter, mythid )
243    # endif
244    #endif
245    
246    C--     Step forward fields and calculate time tendency terms.
247    #ifdef ALLOW_DEBUG
248          IF ( debugLevel .GE. debLevB )
249         &    CALL DEBUG_CALL('THERMODYNAMICS',myThid)
250    #endif
251            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
252            CALL THERMODYNAMICS( myTime, myIter, myThid )
253            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
254    
255    C--   do exchanges (needed for DYNAMICS) when using stagger time-step :
256    #ifdef ALLOW_DEBUG
257          IF ( debugLevel .GE. debLevB )
258         &    CALL DEBUG_CALL('DO_STAGGER_FIELDS_EXCH.',myThid)
259    #endif
260            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
261            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
262            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
263    
264    #ifdef ALLOW_SHAP_FILT
265          IF (useSHAP_FILT .AND.
266         &     staggerTimeStep .AND. shap_filt_TrStagg ) THEN
267    #ifdef ALLOW_DEBUG
268            IF ( debugLevel .GE. debLevB )
269         &    CALL DEBUG_CALL('SHAP_FILT_APPLY_TS',myThid)
270    #endif
271            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
272            CALL SHAP_FILT_APPLY_TS(gT,gS,myTime+deltaT,myIter+1,myThid)
273            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
274          ENDIF
275    #endif
276    #ifdef ALLOW_ZONAL_FILT
277          IF (useZONAL_FILT .AND.
278         &     staggerTimeStep .AND. zonal_filt_TrStagg ) THEN
279    #ifdef ALLOW_DEBUG
280            IF ( debugLevel .GE. debLevB )
281         &    CALL DEBUG_CALL('ZONAL_FILT_APPLY_TS',myThid)
282    #endif
283            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
284            CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid )
285            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
286          ENDIF
287    #endif  
288    
289    C--   Step forward fields and calculate time tendency terms.
290    #ifndef ALLOW_AUTODIFF_TAMC
291          IF ( momStepping ) THEN
292    #endif
293    #ifdef ALLOW_DEBUG
294            IF ( debugLevel .GE. debLevB )
295         &    CALL DEBUG_CALL('DYNAMICS',myThid)
296    #endif
297            CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
298            CALL DYNAMICS( myTime, myIter, myThid )
299            CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
300    #ifndef ALLOW_AUTODIFF_TAMC
301          ENDIF
302    #endif
303    
304  #ifdef ALLOW_NONHYDROSTATIC  #ifdef ALLOW_NONHYDROSTATIC
305  C--   Step forward W field in N-H algorithm  C--   Step forward W field in N-H algorithm
306        IF ( nonHydrostatic ) THEN        IF ( momStepping .AND. nonHydrostatic ) THEN
307         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)  #ifdef ALLOW_DEBUG
308         CALL CALC_GW( myThid)            IF ( debugLevel .GE. debLevB )
309         CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)       &     CALL DEBUG_CALL('CALC_GW',myThid)
310    #endif
311             CALL TIMER_START('CALC_GW          [FORWARD_STEP]',myThid)
312             CALL CALC_GW(myThid)
313             CALL TIMER_STOP ('CALC_GW          [FORWARD_STEP]',myThid)
314        ENDIF        ENDIF
315  #endif  #endif
316    
317    #ifdef NONLIN_FRSURF
318    C--   update hfacC,W,S and recip_hFac according to etaH(n+1) :
319          IF ( nonlinFreeSurf.GT.0) THEN
320           IF ( select_rStar.GT.0 ) THEN
321            CALL TIMER_START('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
322            CALL UPDATE_R_STAR( myTime, myIter, myThid )
323            CALL TIMER_STOP ('UPDATE_R_STAR      [FORWARD_STEP]',myThid)
324           ELSE
325            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
326            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
327            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
328           ENDIF
329          ENDIF
330    C-    update also CG2D matrix (and preconditioner)
331          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
332            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',myThid)
333            CALL UPDATE_CG2D( myTime, myIter, myThid )
334            CALL TIMER_STOP ('UPDATE_CG2D        [FORWARD_STEP]',myThid)
335          ENDIF
336    #endif
337    
338    C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
339  #ifdef ALLOW_SHAP_FILT  #ifdef ALLOW_SHAP_FILT
340  C--   Step forward all tiles, filter and exchange.        IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
341        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)          CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
342        CALL SHAP_FILT_APPLY(          IF (implicDiv2Dflow.LT.1.) THEN
      I                     gUnm1, gVnm1, gTnm1, gSnm1,  
      I                     myCurrentTime, myCurrentIter, myThid )  
       IF (implicDiv2Dflow.LT.1.) THEN  
343  C--   Explicit+Implicit part of the Barotropic Flow Divergence  C--   Explicit+Implicit part of the Barotropic Flow Divergence
344  C      => Filtering of uVel,vVel is necessary  C      => Filtering of uVel,vVel is necessary
345           CALL SHAP_FILT_UV( uVel, vVel, myCurrentTime, myThid )            CALL SHAP_FILT_APPLY_UV( uVel,vVel,
346         &                             myTime+deltaT, myIter+1, myThid )
347            ENDIF
348            CALL SHAP_FILT_APPLY_UV( gU,gV,myTime+deltaT,myIter+1,myThid)
349            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
350        ENDIF        ENDIF
       CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)  
351  #endif  #endif
   
352  #ifdef ALLOW_ZONAL_FILT  #ifdef ALLOW_ZONAL_FILT
353        IF (zonal_filt_lat.LT.90.) THEN        IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
354        CALL ZONAL_FILT_APPLY(          CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
355       U           gUnm1, gVnm1, gTnm1, gSnm1,          IF (implicDiv2Dflow.LT.1.) THEN
356       I           myThid )  C--   Explicit+Implicit part of the Barotropic Flow Divergence
357    C      => Filtering of uVel,vVel is necessary
358              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
359            ENDIF
360            CALL ZONAL_FILT_APPLY_UV( gU, gV, myThid )
361            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
362        ENDIF        ENDIF
363  #endif  #endif  
364    
365  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
366  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
367  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
368        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
369        CALL SOLVE_FOR_PRESSURE( myThid )        CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
370        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
371          CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
372          ENDIF
373    
374    #ifdef ALLOW_AUTODIFF_TAMC
375    cph This is needed because convective_adjustment calls
376    cph find_rho which may use pressure()
377    CADJ STORE totphihyd  = comlev1, key = ikey_dynamics
378    #endif
379  C--   Correct divergence in flow field and cycle time-stepping  C--   Correct divergence in flow field and cycle time-stepping
380  C     arrays (for all fields) ; update time-counter  C     arrays (for all fields) ; update time-counter
381        myCurrentIter = nIter0 + iLoop        myIter = nIter0 + iLoop
382        myCurrentTime = startTime + deltaTClock * float(iLoop)        myTime = startTime + deltaTClock * float(iLoop)
383        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)        CALL TIMER_START('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
384          CALL THE_CORRECTION_STEP(myTime, myIter, myThid)
385          CALL TIMER_STOP ('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
386    
387  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
388  c     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
389  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
390  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
391    
392  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
393        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
394        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
395        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
396    
397    cswdptr -- add for seperate timestepping of chemical/biological/forcing
398    cswdptr    of ptracers ---
399    #ifdef ALLOW_GCHEM
400    ceh3 This is broken -- this ifdef should not be visible!
401    #ifdef PTRACERS_SEPARATE_FORCING
402    ceh3 needs an IF ( use GCHEM ) THEN
403            call GCHEM_FORCING_SEP( myTime,myIter,myThid )
404    #endif /* PTRACERS_SEPARATE_FORCING */
405    #endif /* ALLOW_GCHEM */
406    cswdptr -- end add ---
407    
408    
409    #ifdef ALLOW_FLT
410    C--   Calculate float trajectories
411          IF (useFLT) THEN
412            CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
413            CALL FLT_MAIN(myIter,myTime, myThid)
414            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
415          ENDIF
416    #endif
417    
418    #ifdef ALLOW_MONITOR
419    C--   Check status of solution (statistics, cfl, etc...)
420          CALL TIMER_START('MONITOR             [FORWARD_STEP]',myThid)
421          CALL MONITOR( myIter, myTime, myThid )
422          CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
423    #endif /* ALLOW_MONITOR */
424    
425  C--   Do IO if needed.  C--   Do IO if needed.
426        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
427        CALL DO_THE_MODEL_IO(.FALSE.,        CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
428       &                     myCurrentTime, myCurrentIter, myThid )        CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
       CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)  
429    
430  C--   Save state for restarts  C--   Save state for restarts
431  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 440  C     Thus a checkpoint contains U.00000
440  C     etaN.0000000001 in the indexing scheme used for the model  C     etaN.0000000001 in the indexing scheme used for the model
441  C     "state" files. This example is referred to as a checkpoint  C     "state" files. This example is referred to as a checkpoint
442  C     at time level 1  C     at time level 1
443        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
444        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
445       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       &        .FALSE., myTime, myIter, myThid )
446        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
447    
448    #ifdef ALLOW_DEBUG
449          IF ( debugLevel .GE. debLevB )
450         &    CALL DEBUG_LEAVE('FORWARD_STEP',myThid)
451    #endif
452    
       RETURN  
453        END        END
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