/[MITgcm]/MITgcm/pkg/seaice/seaice_ocean_stress.F
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revision 1.4 by mlosch, Thu Mar 9 20:22:40 2006 UTC revision 1.25 by mlosch, Wed Jun 24 08:01:43 2009 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    
40        INTEGER i, j, bi, bj        INTEGER i, j, bi, bj
41        _RL  SINWAT, COSWAT        _RL  SINWAT, COSWAT, SINWIN, COSWIN
42        _RL  fuIce, fvIce        _RL  fuIceLoc, fvIceLoc
43        _RL  areaW, areaS        _RL  areaW, areaS
44    
45  c     introduce turning angle (default is zero)  c     introduce turning angle (default is zero)
46        SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad)        SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad)
47        COSWAT=COS(SEAICE_waterTurnAngle*deg2rad)        COSWAT=COS(SEAICE_waterTurnAngle*deg2rad)
48          SINWIN=SIN(SEAICE_airTurnAngle*deg2rad)
49          COSWIN=COS(SEAICE_airTurnAngle*deg2rad)
50    
51  C--   Update overlap regions        IF ( useHB87StressCoupling ) THEN
52        CALL EXCH_UV_XY_RL(WINDX, WINDY, .TRUE., myThid)  C
53    C     use an intergral over ice and ocean surface layer to define
54  #ifndef SEAICE_EXTERNAL_FLUXES  C     surface stresses on ocean following Hibler and Bryan (1987, JPO)
55  C--   Interpolate wind stress (N/m^2) from C-points of C-grid  C
56  C     to U and V points of C-grid for forcing the ocean model.         DO bj=myByLo(myThid),myByHi(myThid)
57        DO bj=myByLo(myThid),myByHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
58         DO bi=myBxLo(myThid),myBxHi(myThid)           DO J=1,sNy
59          DO j=1,sNy            DO I=1,sNx
60           DO i=1,sNx  C     average wind stress over ice and ocean and apply averaged wind
61            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
62            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))
63         &          * SEAICEstressFactor
64               areaS = 0.5 * (AREA(I,J,bi,bj) + AREA(I,J-1,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               fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)
70         &          + areaS*tauy(I,J,bi,bj)
71         &          + stressDivergenceY(I,J,bi,bj) * SEAICEstressFactor
72              ENDDO
73           ENDDO           ENDDO
74          ENDDO          ENDDO
75         ENDDO         ENDDO
76        ENDDO  
77  #endif /* ifndef SEAICE_EXTERNAL_FLUXES */        ELSE
78    C     else: useHB87StressCoupling=F
79    
80  C--   Compute ice-affected wind stress (interpolate to U/V-points)  C--   Compute ice-affected wind stress (interpolate to U/V-points)
81    C     by averaging wind stress and ice-ocean stress according to
82    C     ice cover
83        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
84         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
85          DO j=1,sNy          DO j=1,sNy
86           DO i=1,sNx           DO i=1,sNx
87            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) )*
88       &         COSWAT *       &         COSWAT *
89       &         ( UICE(I,J,1,bi,bj)-GWATX(I,J,bi,bj) )       &         ( UICE(I,J,bi,bj)-uVel(I,J,1,bi,bj) )
90       &         - SINWAT* 0.5 _d 0 * (       &         - SIGN(SINWAT, _fCori(I,J,bi,bj)) * 0.5 _d 0 *
91       &          0.5 _d 0*(vIce(I  ,J  ,1,bi,bj)-GWATY(I  ,J  ,bi,bj)       &         ( DWATN(I  ,J,bi,bj) *
92       &                   +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  ,1,bi,bj)
93       &         +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+1,1,bi,bj))
94       &                   +vIce(I-1,J+1,1,bi,bj)-GWATY(I-1,J+1,bi,bj)) )       &         + DWATN(I-1,J,bi,bj) *
95         &         0.5 _d 0*(vIce(I-1,J  ,bi,bj)-vVel(I-1,J  ,1,bi,bj)
96         &                  +vIce(I-1,J+1,bi,bj)-vVel(I-1,J+1,1,bi,bj))
97       &         )       &         )
98            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) )*
99       &         SINWAT *       &         COSWAT *
100       &         ( UICE(I,J,1,bi,bj)-GWATX(I,J,bi,bj) )       &         ( VICE(I,J,bi,bj)-vVel(I,J,1,bi,bj) )
101       &         + COSWAT * 0.5 _d 0 * (       &         + SIGN(SINWAT,  _fCori(I,J,bi,bj)) * 0.5 _d 0 *
102       &          0.5 _d 0*(uIce(I  ,J  ,1,bi,bj)-GWATX(I  ,J  ,bi,bj)       &         ( DWATN(I,J  ,bi,bj) *
103       &                   +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  ,1,bi,bj)
104       &         +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  ,1,bi,bj))
105       &                   +uIce(I+1,J-1,1,bi,bj)-GWATX(I+1,J-1,bi,bj)) )       &         + DWATN(I,J-1,bi,bj) *
106         &         0.5 _d 0*(uIce(I  ,J-1,bi,bj)-uVel(I  ,J-1,1,bi,bj)
107         &                  +uIce(I+1,J-1,bi,bj)-uVel(I+1,J-1,1,bi,bj))
108       &         )       &         )
109            areaW = 0.5 _d 0 * (AREA(I,J,1,bi,bj) + AREA(I-1,J,1,bi,bj))            areaW = 0.5 _d 0 * (AREA(I,J,bi,bj) + AREA(I-1,J,bi,bj))
110            areaS = 0.5 _d 0 * (AREA(I,J,1,bi,bj) + AREA(I,J-1,1,bi,bj))       &         * SEAICEstressFactor
111            fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj)+areaW*fuIce            areaS = 0.5 _d 0 * (AREA(I,J,bi,bj) + AREA(I,J-1,bi,bj))
112            fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)+areaS*fvIce       &         * SEAICEstressFactor
113              fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj)+areaW*fuIceLoc
114              fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)+areaS*fvIceLoc
115           ENDDO           ENDDO
116          ENDDO          ENDDO
117         ENDDO         ENDDO
118        ENDDO        ENDDO
119          ENDIF
120        CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)        CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid)
121    
122  #endif /* not SEAICE_CGRID */  #endif /* SEAICE_CGRID */
123    
124        RETURN        RETURN
125        END        END
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