/[MITgcm]/MITgcm/pkg/seaice/seaice_ocean_stress.F
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revision 1.3 by mlosch, Mon Mar 6 20:53:25 2006 UTC revision 1.28 by mlosch, Wed Nov 24 15:36:31 2010 UTC
# Line 4  C $Name$ Line 4  C $Name$
4  #include "SEAICE_OPTIONS.h"  #include "SEAICE_OPTIONS.h"
5    
6  CStartOfInterface  CStartOfInterface
7        SUBROUTINE SEAICE_OCEAN_STRESS(        SUBROUTINE SEAICE_OCEAN_STRESS(
8       I     myTime, myIter, myThid )       I     myTime, myIter, myThid )
9  C     /==========================================================\  C     /==========================================================\
10  C     | SUBROUTINE SEAICE_OCEAN_STRESS                           |  C     | SUBROUTINE SEAICE_OCEAN_STRESS                           |
# Line 18  C     === Global variables === Line 18  C     === Global variables ===
18  #include "SIZE.h"  #include "SIZE.h"
19  #include "EEPARAMS.h"  #include "EEPARAMS.h"
20  #include "PARAMS.h"  #include "PARAMS.h"
21    #include "DYNVARS.h"
22    #include "GRID.h"
23  #include "FFIELDS.h"  #include "FFIELDS.h"
24  #include "SEAICE.h"  #include "SEAICE.h"
25  #include "SEAICE_PARAMS.h"  #include "SEAICE_PARAMS.h"
# Line 29  C     myThid - Thread no. that called th Line 31  C     myThid - Thread no. that called th
31        _RL     myTime        _RL     myTime
32        INTEGER myIter        INTEGER myIter
33        INTEGER myThid        INTEGER myThid
 CML      _RL COR_ICE    (1-OLx:sNx+OLx,1-OLy:sNy+OLy,  nSx,nSy)  
34  CEndOfInterface  CEndOfInterface
35    
36  #ifdef SEAICE_CGRID  #ifdef SEAICE_CGRID
37  C     === Local variables ===  C     === Local variables ===
38  C     i,j,bi,bj - Loop counters  C     i,j,bi,bj - Loop counters
39    C     kSrf      - vertical index of surface layer
40        INTEGER i, j, bi, bj        INTEGER i, j, bi, bj
41        _RL  SINWAT, COSWAT        INTEGER kSrf
42        _RL  fuIce, fvIce        _RL  COSWAT
43          _RS  SINWAT
44  c     introduce turning angle (default is zero)        _RL  fuIceLoc, fvIceLoc
45          _RL  areaW, areaS
46    
47    C     surrface level
48          kSrf = 1
49    C     introduce turning angle (default is zero)
50        SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad)        SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad)
51        COSWAT=COS(SEAICE_waterTurnAngle*deg2rad)        COSWAT=COS(SEAICE_waterTurnAngle*deg2rad)
52    
53  C--   Update overlap regions        IF ( useHB87StressCoupling ) THEN
54        CALL EXCH_UV_XY_RL(WINDX, WINDY, .TRUE., myThid)  C
55    C     use an intergral over ice and ocean surface layer to define
56  #ifndef SEAICE_EXTERNAL_FLUXES  C     surface stresses on ocean following Hibler and Bryan (1987, JPO)
57  C--   Interpolate wind stress (N/m^2) from C-points of C-grid  C
58  C     to U and V points of C-grid for forcing the ocean model.         DO bj=myByLo(myThid),myByHi(myThid)
59        DO bj=myByLo(myThid),myByHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
60         DO bi=myBxLo(myThid),myBxHi(myThid)           DO J=1,sNy
61          DO j=1,sNy            DO I=1,sNx
62           DO i=1,sNx  C     average wind stress over ice and ocean and apply averaged wind
63            fu(I,J,bi,bj)=0.5*(WINDX(I,J,bi,bj) + WINDX(I-1,J,bi,bj))  C     stress and internal ice stresses to surface layer of ocean
64            fv(I,J,bi,bj)=0.5*(WINDY(I,J,bi,bj) + WINDY(I,J-1,bi,bj))             areaW = 0.5 * (AREA(I,J,bi,bj) + AREA(I-1,J,bi,bj))
65         &          * SEAICEstressFactor
66               fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj)
67         &          + areaW*taux(I,J,bi,bj)
68         &          + stressDivergenceX(I,J,bi,bj) * SEAICEstressFactor
69              ENDDO
70             ENDDO
71             DO J=1,sNy
72              DO I=1,sNx
73               areaS = 0.5 * (AREA(I,J,bi,bj) + AREA(I,J-1,bi,bj))
74         &          * SEAICEstressFactor
75               fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)
76         &          + areaS*tauy(I,J,bi,bj)
77         &          + stressDivergenceY(I,J,bi,bj) * SEAICEstressFactor
78              ENDDO
79           ENDDO           ENDDO
80          ENDDO          ENDDO
81         ENDDO         ENDDO
82        ENDDO  
83  #endif /* ifndef SEAICE_EXTERNAL_FLUXES */        ELSE
84    C     else: useHB87StressCoupling=F
85    
86  C--   Compute ice-affected wind stress (interpolate to U/V-points)  C--   Compute ice-affected wind stress (interpolate to U/V-points)
87    C     by averaging wind stress and ice-ocean stress according to
88    C     ice cover
89        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
90         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
91          DO j=1,sNy          DO j=1,sNy
92           DO i=1,sNx           DO i=1,sNx
93            fuIce=HALF*( DWATN(I,J,bi,bj)+DWATN(I,J+1,bi,bj) )*(            fuIceLoc=HALF*( DWATN(I,J,bi,bj)+DWATN(I-1,J,bi,bj) )*
94       &         COSWAT *       &         COSWAT *
95       &         ( UICE(I,J,1,bi,bj)-GWATX(I,J,bi,bj) )       &         ( uIce(I,J,bi,bj)-uVel(I,J,kSrf,bi,bj) )
96       &         - SINWAT* 0.5 _d 0 * (       &         - SIGN(SINWAT, _fCori(I,J,bi,bj)) * 0.5 _d 0 *
97       &          0.5 _d 0*(vIce(I  ,J  ,1,bi,bj)-GWATY(I  ,J  ,bi,bj)       &         ( DWATN(I  ,J,bi,bj) *
98       &                   +vIce(I-1,J  ,1,bi,bj)-GWATY(I-1,J  ,bi,bj))       &         0.5 _d 0*(vIce(I  ,J  ,bi,bj)-vVel(I  ,J  ,kSrf,bi,bj)
99       &         +0.5 _d 0*(vIce(I  ,J+1,1,bi,bj)-GWATY(I  ,J+1,bi,bj)       &                  +vIce(I  ,J+1,bi,bj)-vVel(I  ,J+1,kSrf,bi,bj))
100       &                   +vIce(I-1,J+1,1,bi,bj)-GWATY(I-1,J+1,bi,bj)) )       &         + DWATN(I-1,J,bi,bj) *
101         &         0.5 _d 0*(vIce(I-1,J  ,bi,bj)-vVel(I-1,J  ,kSrf,bi,bj)
102         &                  +vIce(I-1,J+1,bi,bj)-vVel(I-1,J+1,kSrf,bi,bj))
103       &         )       &         )
104            fvIce=HALF*( DWATN(I,J,bi,bj)+DWATN(I+1,J,bi,bj) )*(            fvIceLoc=HALF*( DWATN(I,J,bi,bj)+DWATN(I,J-1,bi,bj) )*
105       &         SINWAT *       &         COSWAT *
106       &         ( UICE(I,J,1,bi,bj)-GWATX(I,J,bi,bj) )       &         ( vIce(I,J,bi,bj)-vVel(I,J,kSrf,bi,bj) )
107       &         + COSWAT * 0.5 _d 0 * (       &         + SIGN(SINWAT,  _fCori(I,J,bi,bj)) * 0.5 _d 0 *
108       &          0.5 _d 0*(uIce(I  ,J  ,1,bi,bj)-GWATX(I  ,J  ,bi,bj)       &         ( DWATN(I,J  ,bi,bj) *
109       &                   +uIce(I+1,J  ,1,bi,bj)-GWATX(I+1,J  ,bi,bj))       &         0.5 _d 0*(uIce(I  ,J  ,bi,bj)-uVel(I  ,J  ,kSrf,bi,bj)
110       &         +0.5 _d 0*(uIce(I  ,J-1,1,bi,bj)-GWATX(I  ,J-1,bi,bj)       &                  +uIce(I+1,J  ,bi,bj)-uVel(I+1,J  ,kSrf,bi,bj))
111       &                   +uIce(I+1,J-1,1,bi,bj)-GWATX(I+1,J-1,bi,bj)) )       &         + DWATN(I,J-1,bi,bj) *
112         &         0.5 _d 0*(uIce(I  ,J-1,bi,bj)-uVel(I  ,J-1,kSrf,bi,bj)
113         &                  +uIce(I+1,J-1,bi,bj)-uVel(I+1,J-1,kSrf,bi,bj))
114       &         )       &         )
115            fu(I,J,bi,bj)=(ONE-AREA(I,J,1,bi,bj))*fu(I,J,bi,bj)+            areaW = 0.5 _d 0 * (AREA(I,J,bi,bj) + AREA(I-1,J,bi,bj))
116       &         AREA(I,J,1,bi,bj)*fuIce       &         * SEAICEstressFactor
117            fv(I,J,bi,bj)=(ONE-AREA(I,J,1,bi,bj))*fv(I,J,bi,bj)+            areaS = 0.5 _d 0 * (AREA(I,J,bi,bj) + AREA(I,J-1,bi,bj))
118       &         AREA(I,J,1,bi,bj)*fvIce       &         * SEAICEstressFactor
119              fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj)+areaW*fuIceLoc
120              fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)+areaS*fvIceLoc
121           ENDDO           ENDDO
122          ENDDO          ENDDO
123         ENDDO         ENDDO
124        ENDDO        ENDDO
125          ENDIF
126        CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)        CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)
127    
128  #endif /* not SEAICE_CGRID */  #endif /* SEAICE_CGRID */
129    
130        RETURN        RETURN
131        END        END
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