--- MITgcm/pkg/seaice/seaice_calc_strainrates.F 2007/06/19 12:09:36 1.6 +++ MITgcm/pkg/seaice/seaice_calc_strainrates.F 2009/06/24 08:23:38 1.14 @@ -1,13 +1,13 @@ -C $Header: /home/ubuntu/mnt/e9_copy/MITgcm/pkg/seaice/seaice_calc_strainrates.F,v 1.6 2007/06/19 12:09:36 mlosch Exp $ +C $Header: /home/ubuntu/mnt/e9_copy/MITgcm/pkg/seaice/seaice_calc_strainrates.F,v 1.14 2009/06/24 08:23:38 mlosch Exp $ C $Name: $ #include "SEAICE_OPTIONS.h" CStartOfInterface - SUBROUTINE SEAICE_CALC_STRAINRATES( + SUBROUTINE SEAICE_CALC_STRAINRATES( I uFld, vFld, - O e11, e22, e12, - I myThid ) + O e11Loc, e22Loc, e12Loc, + I iStep, myTime, myIter, myThid ) C /==========================================================\ C | SUBROUTINE SEAICE_CALC_STRAINRATES | C | o compute strain rates from ice velocities | @@ -22,21 +22,28 @@ #include "PARAMS.h" #include "GRID.h" #include "SEAICE_PARAMS.h" +#include "SEAICE.h" #ifdef ALLOW_AUTODIFF_TAMC # include "tamc.h" #endif C === Routine arguments === -C myThid - Thread no. that called this routine. +C iStep :: Sub-time-step number +C myTime :: Simulation time +C myIter :: Simulation timestep number +C myThid :: My Thread Id. number + INTEGER iStep + _RL myTime + INTEGER myIter INTEGER myThid C ice velocities - _RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) - _RL vFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) + _RL uFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) + _RL vFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) C strain rate tensor - _RL e11 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) - _RL e22 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) - _RL e12 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) + _RL e11Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) + _RL e22Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) + _RL e12Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) CEndOfInterface #ifdef SEAICE_CGRID @@ -46,28 +53,86 @@ INTEGER i, j, bi, bj C hFacU, hFacV - determine the no-slip boundary condition INTEGER k - _RS hFacU, hFacV + _RS hFacU, hFacV, noSlipFac k = 1 + noSlipFac = 0. _d 0 + IF ( SEAICE_no_slip ) noSlipFac = 1. _d 0 C +#ifndef SEAICE_OLD_AND_BAD_DISCRETIZATION DO bj=myByLo(myThid),myByHi(myThid) DO bi=myBxLo(myThid),myBxHi(myThid) DO j=1-Oly,sNy+Oly-1 DO i=1-Olx,sNx+Olx-1 C evaluate strain rates - e11(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) * + e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) * + & (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj)) + & +HALF* + & (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj)) + & * k2AtC(I,J,bi,bj) + e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) * + & (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj)) + & +HALF* + & (uFld(I,J,bi,bj)+uFld(I+1,J,bi,bj)) + & * k1AtC(I,J,bi,bj) + ENDDO + ENDDO + DO j=1-Oly+1,sNy+Oly + DO i=1-Olx+1,sNx+Olx + hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj) + hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj) + e12Loc(I,J,bi,bj) = HALF*( + & ( uFld(I,J,bi,bj) - uFld(I ,J-1,bi,bj) ) + & * _recip_dyU(I,J,bi,bj) + & + ( vFld(I,J,bi,bj) - vFld(I-1,J ,bi,bj) ) + & * _recip_dxV(I,J,bi,bj) + & - k1AtZ(I,J,bi,bj) + & * 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J ,bi,bj)) + & - k2AtZ(I,J,bi,bj) + & * 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) + & ) + & *maskC(I ,J ,k,bi,bj)*maskC(I-1,J ,k,bi,bj) + & *maskC(I ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj) + & + 2.0 _d 0 * noSlipFac * ( + & ( uFld(I,J,bi,bj) + uFld(I ,J-1,bi,bj) ) + & * _recip_dyU(I,J,bi,bj) * hFacU + & + ( vFld(I,J,bi,bj) + vFld(I-1,J ,bi,bj) ) + & * _recip_dxV(I,J,bi,bj) * hFacV + & ) +C no slip at the boundary implies u(j)+u(j-1)=0 and v(i)+v(i-1)=0 +C accross the boundary; this is already accomplished by masking so +C that the following lines are not necessary +c$$$ & - hFacV * k1AtZ(I,J,bi,bj) +c$$$ & * 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J ,bi,bj)) +c$$$ & - hFacU * k2AtZ(I,J,bi,bj) +c$$$ & * 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) + ENDDO + ENDDO + +c$$$ ENDIF + ENDDO + ENDDO +#else +C this the old and incomplete discretization, here I also erroneously +C used finite-volumes to discretize the strain rates + DO bj=myByLo(myThid),myByHi(myThid) + DO bi=myBxLo(myThid),myBxHi(myThid) + DO j=1-Oly,sNy+Oly-1 + DO i=1-Olx,sNx+Olx-1 +C evaluate strain rates + e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) * & (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj)) & -HALF* & (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj)) & * _tanPhiAtU(I,J,bi,bj)*recip_rSphere - e22(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) * + e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) * & (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj)) C one metric term is missing ENDDO ENDDO DO j=1-Oly+1,sNy+Oly DO i=1-Olx+1,sNx+Olx - e12(I,J,bi,bj) = HALF*( + e12Loc(I,J,bi,bj) = HALF*( & (uFld(I ,J ,bi,bj) * _dxC(I ,J ,bi,bj) & -uFld(I ,J-1,bi,bj) * _dxC(I ,J-1,bi,bj) & +vFld(I ,J ,bi,bj) * _dyC(I ,J ,bi,bj) @@ -84,19 +149,19 @@ ENDDO ENDDO IF ( SEAICE_no_slip ) THEN -C no slip boundary conditions apply only to e12 +C no slip boundary conditions apply only to e12Loc DO j=1-Oly+1,sNy+Oly DO i=1-Olx+1,sNx+Olx hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj) hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj) - e12(I,J,bi,bj) = e12(I,J,bi,bj) - & + recip_rAz(i,j,bi,bj) * - & ( hFacU * ( _dxC(i,j ,bi,bj)*uFld(i,j ,bi,bj) - & + _dxC(i,j-1,bi,bj)*uFld(i,j-1,bi,bj) ) - & + hFacV * ( _dyC(i ,j,bi,bj)*vFld(i ,j,bi,bj) - & + _dyC(i-1,j,bi,bj)*vFld(i-1,j,bi,bj) ) ) - & - hFacU + e12Loc(I,J,bi,bj) = e12Loc(I,J,bi,bj) + & + recip_rAz(i,j,bi,bj) * 2. _d 0 * + & ( hFacU * ( _dxC(i,j-1,bi,bj)*uFld(i,j ,bi,bj) + & + _dxC(i,j, bi,bj)*uFld(i,j-1,bi,bj) ) + & + hFacV * ( _dyC(i-1,j,bi,bj)*vFld(i ,j,bi,bj) + & + _dyC(i, j,bi,bj)*vFld(i-1,j,bi,bj) ) ) + & - hFacU & * 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) & * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) ) & *recip_rSphere @@ -107,6 +172,7 @@ ENDIF ENDDO ENDDO +#endif /* SEAICE_OLD_AND_BAD_DISCRETIZATION */ #endif /* SEAICE_ALLOW_DYNAMICS */ #endif /* SEAICE_CGRID */ RETURN