/[MITgcm]/MITgcm/pkg/seaice/seaice_calc_strainrates.F
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revision 1.3 by mlosch, Mon Apr 23 14:19:18 2007 UTC revision 1.8 by jmc, Tue Nov 13 19:26:25 2007 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_CALC_STRAINRATES(        SUBROUTINE SEAICE_CALC_STRAINRATES(
8       I     uFld, vFld,       I     uFld, vFld,
9       O     e11, e22, e12,       O     e11, e22, e12,
10       I     myThid )       I     iStep, myTime, myIter, myThid )
11  C     /==========================================================\  C     /==========================================================\
12  C     | SUBROUTINE  SEAICE_CALC_STRAINRATES                      |  C     | SUBROUTINE  SEAICE_CALC_STRAINRATES                      |
13  C     | o compute strain rates from ice velocities               |  C     | o compute strain rates from ice velocities               |
# Line 28  C     === Global variables === Line 28  C     === Global variables ===
28  #endif  #endif
29    
30  C     === Routine arguments ===  C     === Routine arguments ===
31  C     myThid - Thread no. that called this routine.  C     iStep  :: Sub-time-step number
32    C     myTime :: Simulation time
33    C     myIter :: Simulation timestep number
34    C     myThid :: My Thread Id. number
35          INTEGER iStep
36          _RL     myTime
37          INTEGER myIter
38        INTEGER myThid        INTEGER myThid
39  C     ice velocities  C     ice velocities
40        _RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy)        _RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy)
# Line 48  C  hFacU, hFacV - determine the no-slip Line 54  C  hFacU, hFacV - determine the no-slip
54        INTEGER k        INTEGER k
55        _RS hFacU, hFacV        _RS hFacU, hFacV
56    
57          k = 1
58  C  C
59        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
60         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
61          DO j=1-Oly+1,sNy+Oly-1          DO j=1-Oly,sNy+Oly-1
62           DO i=1-Olx+1,sNx+Olx-1           DO i=1-Olx,sNx+Olx-1
63  C NOW EVALUATE STRAIN RATES  C     evaluate strain rates
64            e11(I,J,bi,bj)= _recip_dxF(I,J,bi,bj) *            e11(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *
65       &         (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj))       &         (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj))
66       &         -HALF*       &         -HALF*
67       &         (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj))       &         (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj))
68       &         * _tanPhiAtU(I,J,bi,bj)*recip_rSphere       &         * _tanPhiAtU(I,J,bi,bj)*recip_rSphere
69            e22(I,J,bi,bj)= _recip_dyF(I,J,bi,bj) *            e22(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *
70       &         (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj))       &         (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj))
71  C     one metric term is missing  C     one metric term is missing
72            e12(I,J,bi,bj)=HALF*(           ENDDO
73            ENDDO
74            DO j=1-Oly+1,sNy+Oly
75             DO i=1-Olx+1,sNx+Olx
76              e12(I,J,bi,bj) = HALF*(
77       &         (uFld(I  ,J  ,bi,bj) * _dxC(I  ,J  ,bi,bj)       &         (uFld(I  ,J  ,bi,bj) * _dxC(I  ,J  ,bi,bj)
78       &         -uFld(I  ,J-1,bi,bj) * _dxC(I  ,J-1,bi,bj)       &         -uFld(I  ,J-1,bi,bj) * _dxC(I  ,J-1,bi,bj)
79       &         +vFld(I  ,J  ,bi,bj) * _dyC(I  ,J  ,bi,bj)       &         +vFld(I  ,J  ,bi,bj) * _dyC(I  ,J  ,bi,bj)
# Line 74  C     one metric term is missing Line 84  C     one metric term is missing
84       &         * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) )       &         * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) )
85       &         *recip_rSphere       &         *recip_rSphere
86       &         )       &         )
87         &         *maskC(I  ,J  ,k,bi,bj)*maskC(I-1,J  ,k,bi,bj)
88         &         *maskC(I  ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj)
89  C     one metric term is missing  C     one metric term is missing
90           ENDDO           ENDDO
91          ENDDO          ENDDO
92          IF ( SEAICE_no_slip ) THEN          IF ( SEAICE_no_slip ) THEN
93  C     no slip boundary conditions apply only to e12  C     no slip boundary conditions apply only to e12
94           k = 1           DO j=1-Oly+1,sNy+Oly
95           DO j=1-Oly+1,sNy+Oly-1            DO i=1-Olx+1,sNx+Olx
           DO i=1-Olx+1,sNx+Olx-1  
96             hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj)             hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj)
97             hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj)             hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj)
98    
99             e12(I,J,bi,bj)= e12(I,J,bi,bj)             e12(I,J,bi,bj) = e12(I,J,bi,bj)
100       &          + HALF*( recip_rAz(i,j,bi,bj)       &          + recip_rAz(i,j,bi,bj) *
101       &          *( hFacU * ( _dxC(i,j  ,bi,bj)*uFld(i,j  ,bi,bj)       &          ( hFacU * ( _dxC(i,j-1,bi,bj)*uFld(i,j  ,bi,bj)
102       &                     + _dxC(i,j-1,bi,bj)*uFld(i,j-1,bi,bj) )       &                    + _dxC(i,j,  bi,bj)*uFld(i,j-1,bi,bj) )
103       &           + hFacV * ( _dyC(i  ,j,bi,bj)*vFld(i  ,j,bi,bj)       &          + hFacV * ( _dyC(i-1,j,bi,bj)*vFld(i  ,j,bi,bj)
104       &                     + _dyC(i-1,j,bi,bj)*vFld(i-1,j,bi,bj) ) )       &                    + _dyC(i,  j,bi,bj)*vFld(i-1,j,bi,bj) ) )
105       &         - hFacU       &         - hFacU
106       &         * 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I  ,J-1,bi,bj))       &         * 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I  ,J-1,bi,bj))
107       &         * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) )       &         * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) )
108       &         *recip_rSphere       &         *recip_rSphere
      &          )  
109  C     one metric term is missing  C     one metric term is missing
110            ENDDO            ENDDO
111           ENDDO           ENDDO
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