/[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 1.41 by jmc, Sat Nov 23 21:47:03 2002 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    #  ifdef 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          INTEGER bi,bj
79  C--   Load forcing/external data fields  
80        CALL TIMER_START('I/O (READ)         [FORWARD_STEP]',myThid)  CEOP
81        CALL EXTERNAL_FIELDS_LOAD( myCurrentTime, myCurrentIter, myThid )  
82        CALL TIMER_STOP ('I/O (READ)         [FORWARD_STEP]',myThid)  
83    #ifdef ALLOW_AUTODIFF_TAMC
84  C--   Step forward fields and calculate time tendency terms  C--     Reset the model iteration counter and the model time.
85        CALL TIMER_START('DYNAMICS           [FORWARD_STEP]',myThid)          myiter = nIter0 + (iloop-1)
86        CALL DYNAMICS( myCurrentTime, myCurrentIter, myThid )          mytime = startTime + float(iloop-1)*deltaTclock
87        CALL TIMER_STOP ('DYNAMICS           [FORWARD_STEP]',myThid)  #endif
88    
89  #ifdef ALLOW_NONHYDROSTATIC  #if (defined (ALLOW_AUTODIFF_TAMC) && defined (ALLOW_AUTODIFF_MONITOR))
90  C--   Step forward W field in N-H algorithm  C       Include call to a dummy routine. Its adjoint will be
91        IF ( nonHydrostatic ) THEN  C       called at the proper place in the adjoint code.
92         CALL TIMER_START('CALC_GW            [FORWARD_STEP]',myThid)  C       The adjoint routine will print out adjoint values
93         CALL CALC_GW( myThid)  C       if requested. The location of the call is important,
94         CALL TIMER_STOP ('CALC_GW            [FORWARD_STEP]',myThid)  C       it has to be after the adjoint of the exchanges
95    C       (DO_GTERM_BLOCKING_EXCHANGES).
96            CALL DUMMY_IN_STEPPING( myTime, myIter, myThid )
97            CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
98    #endif
99    
100    #ifdef EXACT_CONSERV
101          IF (exactConserv) THEN
102    C--   Update etaH(n+1) :
103             CALL TIMER_START('UPDATE_ETAH        [FORWARD_STEP]',mythid)
104             CALL UPDATE_ETAH( myTime, myIter, myThid )
105             CALL TIMER_STOP ('UPDATE_ETAH        [FORWARD_STEP]',mythid)
106        ENDIF        ENDIF
107    #endif /* EXACT_CONSERV */
108    
109    #ifdef NONLIN_FRSURF
110    C--   compute the future surface level thickness
111    C      according to etaH(n+1)
112            IF ( nonlinFreeSurf.GT.0) THEN
113              CALL TIMER_START('CALC_SURF_DR      [FORWARD_STEP]',mythid)
114              CALL CALC_SURF_DR(etaH, myTime, myIter, myThid )
115              CALL TIMER_STOP ('CALC_SURF_DR      [FORWARD_STEP]',mythid)
116            ENDIF
117    #endif /* NONLIN_FRSURF */
118    
119    
120    
121    
122    C--     Load forcing/external data fields.
123    #ifdef ALLOW_AUTODIFF_TAMC
124    c**************************************
125    #include "checkpoint_lev1_directives.h"
126    c**************************************
127  #endif  #endif
128    
129  #ifdef ALLOW_SHAP_FILT  
130  C--   Step forward all tiles, filter and exchange.  C--   Call external forcing package
131        CALL TIMER_START('SHAP_FILT          [FORWARD_STEP]',myThid)  cswdblk -- add ---
132        CALL SHAP_FILT_APPLY(  #ifdef ALLOW_BULK_FORCE
133       I                     gUnm1, gVnm1, gTnm1, gSnm1,         CALL TIMER_START('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
134       I                     myCurrentTime, myCurrentIter, myThid )         CALL BULKF_FIELDS_LOAD( mytime, myiter, mythid )
135        CALL TIMER_STOP ('SHAP_FILT          [FORWARD_STEP]',myThid)         CALL TIMER_STOP ('BULKF_FIELDS_LOAD[THE_MAIN_LOOP]',mythid)
136    c calculate qnet and empmr (and wind stress)
137           DO bj=myByLo(myThid),myByHi(myThid)
138             DO bi=myBxLo(myThid),myBxHi(myThid)
139              CALL BULKF_FORCING( bi,bj, mytime, myiter, mythid )
140             ENDDO
141           ENDDO
142    c     Update the tile edges.
143           _EXCH_XY_R8(Qnet,   mythid)
144           _EXCH_XY_R8(EmPmR,   mythid)
145           _EXCH_XY_R8(fu     , mythid)
146           _EXCH_XY_R8(fv     , mythid)
147    cswdblk -- end add ---
148  #endif  #endif
149    #ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE
150            IF ( .not. useSEAICE .and. .not. useBulkForce ) THEN
151             CALL TIMER_START('EXF_GETFORCING     [FORWARD_STEP]',mythid)
152             CALL EXF_GETFORCING( mytime, myiter, mythid )
153             CALL TIMER_STOP ('EXF_GETFORCING     [FORWARD_STEP]',mythid)
154            ENDIF
155    #else
156            IF ( .not. useSEAICE .and. .not. useBulkForce ) THEN
157             CALL TIMER_START('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
158             CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid )
159             CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[FORWARD_STEP]',mythid)
160            ENDIF
161    #endif /* INCLUDE_EXTERNAL_FORCING_PACKAGE */
162    
163  #ifdef ALLOW_ZONAL_FILT  
164        CALL ZONAL_FILT_APPLY(  
165       U           gUnm1, gVnm1, gTnm1, gSnm1,  
166       I           myThid )  #ifdef ALLOW_SEAICE
167    C--   Call sea ice model to compute forcing/external data fields.
168            IF ( useSEAICE ) THEN
169             CALL TIMER_START('SEAICE_MODEL       [FORWARD_STEP]',myThid)
170             CALL SEAICE_MODEL( myTime, myIter, myThid )
171             CALL TIMER_STOP ('SEAICE_MODEL       [FORWARD_STEP]',myThid)
172            ENDIF
173    #endif ALLOW_SEAICE
174    
175    C--     Step forward fields and calculate time tendency terms.
176            CALL TIMER_START('THERMODYNAMICS      [FORWARD_STEP]',mythid)
177            CALL THERMODYNAMICS( myTime, myIter, myThid )
178            CALL TIMER_STOP ('THERMODYNAMICS      [FORWARD_STEP]',mythid)
179    
180    C--   do exchanges (needed for DYNAMICS) when using stagger time-step :
181            CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
182            CALL DO_STAGGER_FIELDS_EXCHANGES( myTime, myIter, myThid )
183            CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
184    
185    #ifdef ALLOW_SHAP_FILT
186           IF (useSHAP_FILT .AND.
187         &     staggerTimeStep .AND. shap_filt_TrStagg ) THEN
188            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
189            CALL SHAP_FILT_APPLY_TS( gT, gS, myTime, myIter, myThid )
190            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
191           ENDIF
192  #endif  #endif
193    #ifdef ALLOW_ZONAL_FILT
194           IF (useZONAL_FILT .AND.
195         &     staggerTimeStep .AND. zonal_filt_TrStagg ) THEN
196            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
197            CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid )
198            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
199          ENDIF
200    #endif  
201    
202  C--   Do IO if needed.  C--     Step forward fields and calculate time tendency terms.
203  C     Note:          IF ( momStepping ) THEN
204  C     =====          CALL TIMER_START('DYNAMICS            [FORWARD_STEP]',mythid)
205  C     At this point model arrays hold U,V,T,S  at "time-level" N          CALL DYNAMICS( myTime, myIter, myThid )
206  C     and cg2d_x at "time-level" N-1/2 where N = I+timeLevBase-1.          CALL TIMER_STOP ('DYNAMICS            [FORWARD_STEP]',mythid)
207  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)  
208    
209    #ifdef ALLOW_NONHYDROSTATIC
210    C--   Step forward W field in N-H algorithm
211            IF ( momStepping .AND. nonHydrostatic ) THEN
212              CALL TIMER_START('CALC_GW          [FORWARD_STEP]',myThid)
213              CALL CALC_GW(myThid)
214              CALL TIMER_STOP ('CALC_GW          [FORWARD_STEP]',myThid)
215            ENDIF
216    #endif
217    
218    #ifdef NONLIN_FRSURF
219    C--   update hfacC,W,S and recip_hFac according to etaH(n+1) :
220          IF ( nonlinFreeSurf.GT.0) THEN
221            CALL TIMER_START('UPDATE_SURF_DR     [FORWARD_STEP]',mythid)
222            CALL UPDATE_SURF_DR( myTime, myIter, myThid )
223            CALL TIMER_STOP ('UPDATE_SURF_DR     [FORWARD_STEP]',myThid)
224          ENDIF
225    C-    update also CG2D matrix (and preconditioner)
226          IF ( momStepping .AND. nonlinFreeSurf.GT.2 ) THEN
227            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',mythid)
228            CALL UPDATE_CG2D( myTime, myIter, myThid )
229            CALL TIMER_START('UPDATE_CG2D        [FORWARD_STEP]',mythid)
230          ENDIF
231    #endif
232    
233        IF (.NOT. doHalfStep) THEN  C--   Apply Filters to u*,v* before SOLVE_FOR_PRESSURE
234    #ifdef ALLOW_SHAP_FILT
235          IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN
236            CALL TIMER_START('SHAP_FILT           [FORWARD_STEP]',myThid)
237            CALL SHAP_FILT_APPLY_UV( gUnm1,gVnm1, myTime,myIter,myThid )
238            IF (implicDiv2Dflow.LT.1.) THEN
239    C--   Explicit+Implicit part of the Barotropic Flow Divergence
240    C      => Filtering of uVel,vVel is necessary
241              CALL SHAP_FILT_APPLY_UV( uVel,vVel, myTime,myIter,myThid )
242            ENDIF
243            CALL TIMER_STOP ('SHAP_FILT           [FORWARD_STEP]',myThid)
244          ENDIF
245    #endif
246    #ifdef ALLOW_ZONAL_FILT
247          IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN
248            CALL TIMER_START('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
249            CALL ZONAL_FILT_APPLY_UV( gUnm1, gVnm1, myThid )
250            IF (implicDiv2Dflow.LT.1.) THEN
251    C--   Explicit+Implicit part of the Barotropic Flow Divergence
252    C      => Filtering of uVel,vVel is necessary
253              CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid )
254            ENDIF
255            CALL TIMER_STOP ('ZONAL_FILT_APPLY    [FORWARD_STEP]',myThid)
256          ENDIF
257    #endif  
258    
259  C--   Solve elliptic equation(s).  C--   Solve elliptic equation(s).
260  C     Two-dimensional only for conventional hydrostatic or  C     Two-dimensional only for conventional hydrostatic or
261  C     three-dimensional for non-hydrostatic and/or IGW scheme.  C     three-dimensional for non-hydrostatic and/or IGW scheme.
262        CALL TIMER_START('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        IF ( momStepping ) THEN
263        CALL SOLVE_FOR_PRESSURE( myThid )        CALL TIMER_START('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
264        CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [FORWARD_STEP]',myThid)        CALL SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
265          CALL TIMER_STOP ('SOLVE_FOR_PRESSURE  [FORWARD_STEP]',myThid)
266          ENDIF
267    
268    #ifdef ALLOW_AUTODIFF_TAMC
269    cph This is needed because convective_adjustment calls
270    cph find_rho which may use pressure()
271    CADJ STORE pressure  = comlev1, key = ikey_dynamics
272    #endif
273  C--   Correct divergence in flow field and cycle time-stepping  C--   Correct divergence in flow field and cycle time-stepping
274  C     arrays (for all fields)  C     arrays (for all fields) ; update time-counter
275        CALL THE_CORRECTION_STEP(myCurrentTime, myCurrentIter, myThid)        myIter = nIter0 + iLoop
276          myTime = startTime + deltaTClock * float(iLoop)
277          CALL TIMER_START('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
278          CALL THE_CORRECTION_STEP(myTime, myIter, myThid)
279          CALL TIMER_STOP ('THE_CORRECTION_STEP [FORWARD_STEP]',myThid)
280    
281  C--   Do "blocking" sends and receives for tendency "overlap" terms  C--   Do "blocking" sends and receives for tendency "overlap" terms
282  C     CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
283  C     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )  c     CALL DO_GTERM_BLOCKING_EXCHANGES( myThid )
284  C     CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)  c     CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
285    
286  C--   Do "blocking" sends and receives for field "overlap" terms  C--   Do "blocking" sends and receives for field "overlap" terms
287        CALL TIMER_START('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_START('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
288        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )        CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid )
289        CALL TIMER_STOP ('BLOCKING_EXCHANGES [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('BLOCKING_EXCHANGES  [FORWARD_STEP]',myThid)
290    
291  c     myCurrentIter = myCurrentIter + 1  #ifdef ALLOW_FLT
292  c     myCurrentTime = myCurrentTime + deltaTClock  C--   Calculate float trajectories
293        myCurrentIter = nIter0 + iLoop        IF (useFLT) THEN
294        myCurrentTime = startTime + deltaTClock * float(iLoop)          CALL TIMER_START('FLOATS            [FORWARD_STEP]',myThid)
295            CALL FLT_MAIN(myIter,myTime, myThid)
296            CALL TIMER_STOP ('FLOATS            [FORWARD_STEP]',myThid)
297          ENDIF
298    #endif
299    
300    #ifndef EXCLUDE_MONITOR
301    C--   Check status of solution (statistics, cfl, etc...)
302          CALL TIMER_START('MONITOR             [FORWARD_STEP]',mythid)
303          CALL MONITOR( myIter, myTime, myThid )
304          CALL TIMER_STOP ('MONITOR             [FORWARD_STEP]',myThid)
305    #endif /* EXCLUDE_MONITOR */
306    
307    C--   Do IO if needed.
308          CALL TIMER_START('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
309          CALL DO_THE_MODEL_IO( myTime, myIter, myThid )
310          CALL TIMER_STOP ('DO_THE_MODEL_IO     [FORWARD_STEP]',myThid)
311    
312  C--   Save state for restarts  C--   Save state for restarts
313  C     Note:  C     Note:    (jmc: is it still the case after ckp35 ?)
314  C     =====  C     =====
315  C     Because of the ordering of the timestepping code and  C     Because of the ordering of the timestepping code and
316  C     tendency term code at end of loop model arrays hold  C     tendency term code at end of loop model arrays hold
317  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,...
318  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
319  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.
320  C      where N = I+timeLevBase-1  C      where N = I+timeLevBase-1
321  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and  C     Thus a checkpoint contains U.0000000000, GU.0000000001 and
322  C     cg2d_x.0000000001 in the indexing scheme used for the model  C     etaN.0000000001 in the indexing scheme used for the model
323  C     "state" files. This example is referred to as a checkpoint  C     "state" files. This example is referred to as a checkpoint
324  C     at time level 1  C     at time level 1
325        CALL TIMER_START('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_START('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
326        CALL WRITE_CHECKPOINT(        CALL WRITE_CHECKPOINT(
327       &        .FALSE., myCurrentTime, myCurrentIter, myThid )       &        .FALSE., myTime, myIter, myThid )
328        CALL TIMER_STOP ('I/O (WRITE)        [FORWARD_STEP]',myThid)        CALL TIMER_STOP ('WRITE_CHECKPOINT    [FORWARD_STEP]',myThid)
   
       ENDIF  
329    
       RETURN  
330        END        END
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