/[MITgcm]/MITgcm/pkg/seaice/seaice_calc_strainrates.F
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revision 1.11 by mlosch, Wed Mar 18 12:58:17 2009 UTC revision 1.12 by mlosch, Fri May 29 10:18:02 2009 UTC
# Line 6  C $Name$ Line 6  C $Name$
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     e11Loc, e22Loc, e12Loc,
10       I     kSize, iStep, myTime, myIter, myThid )       I     kSize, iStep, myTime, myIter, myThid )
11  C     /==========================================================\  C     /==========================================================\
12  C     | SUBROUTINE  SEAICE_CALC_STRAINRATES                      |  C     | SUBROUTINE  SEAICE_CALC_STRAINRATES                      |
# Line 43  C     ice velocities Line 43  C     ice velocities
43        _RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,kSize,nSx,nSy)        _RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,kSize,nSx,nSy)
44        _RL vFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,kSize,nSx,nSy)        _RL vFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,kSize,nSx,nSy)
45  C     strain rate tensor  C     strain rate tensor
46        _RL e11 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL e11Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
47        _RL e22 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL e22Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
48        _RL e12 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL e12Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
49  CEndOfInterface  CEndOfInterface
50    
51  #ifdef SEAICE_CGRID  #ifdef SEAICE_CGRID
# Line 67  C Line 67  C
67          DO j=1-Oly,sNy+Oly-1          DO j=1-Oly,sNy+Oly-1
68           DO i=1-Olx,sNx+Olx-1           DO i=1-Olx,sNx+Olx-1
69  C     evaluate strain rates  C     evaluate strain rates
70            e11(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *            e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *
71       &         (uFld(I+1,J,1,bi,bj)-uFld(I,J,1,bi,bj))       &         (uFld(I+1,J,1,bi,bj)-uFld(I,J,1,bi,bj))
72       &         +HALF*       &         +HALF*
73       &         (vFld(I,J,1,bi,bj)+vFld(I,J+1,1,bi,bj))       &         (vFld(I,J,1,bi,bj)+vFld(I,J+1,1,bi,bj))
74       &         * k2AtC(I,J,bi,bj)       &         * k2AtC(I,J,bi,bj)
75            e22(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *            e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *
76       &         (vFld(I,J+1,1,bi,bj)-vFld(I,J,1,bi,bj))       &         (vFld(I,J+1,1,bi,bj)-vFld(I,J,1,bi,bj))
77       &         +HALF*       &         +HALF*
78       &         (uFld(I,J,1,bi,bj)+uFld(I+1,J,1,bi,bj))       &         (uFld(I,J,1,bi,bj)+uFld(I+1,J,1,bi,bj))
# Line 84  C     one metric term is missing Line 84  C     one metric term is missing
84           DO i=1-Olx+1,sNx+Olx           DO i=1-Olx+1,sNx+Olx
85            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)
86            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)
87            e12(I,J,bi,bj) = HALF*(            e12Loc(I,J,bi,bj) = HALF*(
88       &           ( uFld(I,J,1,bi,bj) - uFld(I  ,J-1,1,bi,bj) )       &           ( uFld(I,J,1,bi,bj) - uFld(I  ,J-1,1,bi,bj) )
89       &         * _recip_dyU(I,J,bi,bj)       &         * _recip_dyU(I,J,bi,bj)
90       &         + ( vFld(I,J,1,bi,bj) - vFld(I-1,J  ,1,bi,bj) )       &         + ( vFld(I,J,1,bi,bj) - vFld(I-1,J  ,1,bi,bj) )
# Line 123  C     used finite-volumes to discretize Line 123  C     used finite-volumes to discretize
123          DO j=1-Oly,sNy+Oly-1          DO j=1-Oly,sNy+Oly-1
124           DO i=1-Olx,sNx+Olx-1           DO i=1-Olx,sNx+Olx-1
125  C     evaluate strain rates  C     evaluate strain rates
126            e11(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *            e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *
127       &         (uFld(I+1,J,1,bi,bj)-uFld(I,J,1,bi,bj))       &         (uFld(I+1,J,1,bi,bj)-uFld(I,J,1,bi,bj))
128       &         -HALF*       &         -HALF*
129       &         (vFld(I,J,1,bi,bj)+vFld(I,J+1,1,bi,bj))       &         (vFld(I,J,1,bi,bj)+vFld(I,J+1,1,bi,bj))
130       &         * _tanPhiAtU(I,J,bi,bj)*recip_rSphere       &         * _tanPhiAtU(I,J,bi,bj)*recip_rSphere
131            e22(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *            e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *
132       &         (vFld(I,J+1,1,bi,bj)-vFld(I,J,1,bi,bj))       &         (vFld(I,J+1,1,bi,bj)-vFld(I,J,1,bi,bj))
133  C     one metric term is missing  C     one metric term is missing
134           ENDDO           ENDDO
135          ENDDO          ENDDO
136          DO j=1-Oly+1,sNy+Oly          DO j=1-Oly+1,sNy+Oly
137           DO i=1-Olx+1,sNx+Olx           DO i=1-Olx+1,sNx+Olx
138            e12(I,J,bi,bj) = HALF*(            e12Loc(I,J,bi,bj) = HALF*(
139       &         (uFld(I  ,J  ,1,bi,bj) * _dxC(I  ,J  ,bi,bj)       &         (uFld(I  ,J  ,1,bi,bj) * _dxC(I  ,J  ,bi,bj)
140       &         -uFld(I  ,J-1,1,bi,bj) * _dxC(I  ,J-1,bi,bj)       &         -uFld(I  ,J-1,1,bi,bj) * _dxC(I  ,J-1,bi,bj)
141       &         +vFld(I  ,J  ,1,bi,bj) * _dyC(I  ,J  ,bi,bj)       &         +vFld(I  ,J  ,1,bi,bj) * _dyC(I  ,J  ,bi,bj)
# Line 152  C     one metric term is missing Line 152  C     one metric term is missing
152           ENDDO           ENDDO
153          ENDDO          ENDDO
154          IF ( SEAICE_no_slip ) THEN          IF ( SEAICE_no_slip ) THEN
155  C     no slip boundary conditions apply only to e12  C     no slip boundary conditions apply only to e12Loc
156           DO j=1-Oly+1,sNy+Oly           DO j=1-Oly+1,sNy+Oly
157            DO i=1-Olx+1,sNx+Olx            DO i=1-Olx+1,sNx+Olx
158             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)
159             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)
160    
161             e12(I,J,bi,bj) = e12(I,J,bi,bj)             e12Loc(I,J,bi,bj) = e12Loc(I,J,bi,bj)
162       &          + recip_rAz(i,j,bi,bj) * 2. _d 0 *       &          + recip_rAz(i,j,bi,bj) * 2. _d 0 *
163       &          ( hFacU * ( _dxC(i,j-1,bi,bj)*uFld(i,j  ,1,bi,bj)       &          ( hFacU * ( _dxC(i,j-1,bi,bj)*uFld(i,j  ,1,bi,bj)
164       &                    + _dxC(i,j,  bi,bj)*uFld(i,j-1,1,bi,bj) )       &                    + _dxC(i,j,  bi,bj)*uFld(i,j-1,1,bi,bj) )
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