| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_ocean_stress.F,v 1.21 2008/01/17 23:18:39 dimitri Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "SEAICE_OPTIONS.h" |
| 5 |
|
| 6 |
CStartOfInterface |
| 7 |
SUBROUTINE SEAICE_OCEAN_STRESS( |
| 8 |
I myTime, myIter, myThid ) |
| 9 |
C /==========================================================\ |
| 10 |
C | SUBROUTINE SEAICE_OCEAN_STRESS | |
| 11 |
C | o Calculate ocean surface stresses | |
| 12 |
C | - C-grid version | |
| 13 |
C |==========================================================| |
| 14 |
C \==========================================================/ |
| 15 |
IMPLICIT NONE |
| 16 |
|
| 17 |
C === Global variables === |
| 18 |
#include "SIZE.h" |
| 19 |
#include "EEPARAMS.h" |
| 20 |
#include "PARAMS.h" |
| 21 |
#include "DYNVARS.h" |
| 22 |
#include "GRID.h" |
| 23 |
#include "FFIELDS.h" |
| 24 |
#include "SEAICE.h" |
| 25 |
#include "SEAICE_PARAMS.h" |
| 26 |
|
| 27 |
C === Routine arguments === |
| 28 |
C myTime - Simulation time |
| 29 |
C myIter - Simulation timestep number |
| 30 |
C myThid - Thread no. that called this routine. |
| 31 |
_RL myTime |
| 32 |
INTEGER myIter |
| 33 |
INTEGER myThid |
| 34 |
CEndOfInterface |
| 35 |
|
| 36 |
#ifdef SEAICE_CGRID |
| 37 |
C === Local variables === |
| 38 |
C i,j,bi,bj - Loop counters |
| 39 |
|
| 40 |
INTEGER i, j, bi, bj |
| 41 |
_RL SINWAT, COSWAT, SINWIN, COSWIN |
| 42 |
_RL fuIceLoc, fvIceLoc, FX, FY |
| 43 |
_RL areaW, areaS |
| 44 |
|
| 45 |
_RL e11 (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 46 |
_RL e22 (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 47 |
_RL e12 (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 48 |
_RL press (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
| 49 |
_RL sig11 (1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
| 50 |
_RL sig22 (1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
| 51 |
_RL sig12 (1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
| 52 |
_RL eplus, eminus |
| 53 |
|
| 54 |
c introduce turning angle (default is zero) |
| 55 |
SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad) |
| 56 |
COSWAT=COS(SEAICE_waterTurnAngle*deg2rad) |
| 57 |
SINWIN=SIN(SEAICE_airTurnAngle*deg2rad) |
| 58 |
COSWIN=COS(SEAICE_airTurnAngle*deg2rad) |
| 59 |
|
| 60 |
IF ( useHB87StressCoupling ) THEN |
| 61 |
C |
| 62 |
C use an intergral over ice and ocean surface layer to define |
| 63 |
C surface stresses on ocean following Hibler and Bryan (1987, JPO) |
| 64 |
C |
| 65 |
C recompute strain rates, viscosities, etc. from updated ice velocities |
| 66 |
IF ( .NOT. SEAICEuseEVP ) THEN |
| 67 |
C only for EVP we already have the stress components otherwise we need |
| 68 |
C to recompute them here |
| 69 |
CALL SEAICE_CALC_STRAINRATES( |
| 70 |
I uIce, vIce, |
| 71 |
O e11, e22, e12, |
| 72 |
I 3, 3, myTime, myIter, myThid ) |
| 73 |
|
| 74 |
CALL SEAICE_CALC_VISCOSITIES( |
| 75 |
I e11, e22, e12, zMin, zMax, hEffM, press0, |
| 76 |
O eta, zeta, press, |
| 77 |
I 3, myTime, myIter, myThid ) |
| 78 |
ENDIF |
| 79 |
C re-compute internal stresses with updated ice velocities |
| 80 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 81 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 82 |
IF ( .NOT. SEAICEuseEVP ) THEN |
| 83 |
C only for EVP we already have computed the stress divergences, for |
| 84 |
C anything else we have to do it here |
| 85 |
DO j=1-Oly,sNy+Oly |
| 86 |
DO i=1-Olx,sNx+Olx |
| 87 |
sig11(I,J) = 0. _d 0 |
| 88 |
sig22(I,J) = 0. _d 0 |
| 89 |
sig12(I,J) = 0. _d 0 |
| 90 |
ENDDO |
| 91 |
ENDDO |
| 92 |
|
| 93 |
DO j=0,sNy |
| 94 |
DO i=0,sNx |
| 95 |
eplus = e11(I,J,bi,bj) + e22(I,J,bi,bj) |
| 96 |
eminus= e11(I,J,bi,bj) - e22(I,J,bi,bj) |
| 97 |
sig11(I,J) = zeta(I,J,bi,bj)*eplus + eta(I,J,bi,bj)*eminus |
| 98 |
& - 0.5 _d 0 * PRESS(I,J,bi,bj) |
| 99 |
sig22(I,J) = zeta(I,J,bi,bj)*eplus - eta(I,J,bi,bj)*eminus |
| 100 |
& - 0.5 _d 0 * PRESS(I,J,bi,bj) |
| 101 |
ENDDO |
| 102 |
ENDDO |
| 103 |
|
| 104 |
DO j=1,sNy+1 |
| 105 |
DO i=1,sNx+1 |
| 106 |
sig12(I,J) = 2. _d 0 * e12(I,J,bi,bj) * |
| 107 |
& ( eta(I,J ,bi,bj) + eta(I-1,J ,bi,bj) |
| 108 |
& + eta(I,J-1,bi,bj) + eta(I-1,J-1,bi,bj) ) |
| 109 |
& /MAX(1. _d 0, |
| 110 |
& hEffM(I,J ,bi,bj) + hEffM(I-1,J ,bi,bj) |
| 111 |
& + hEffM(I,J-1,bi,bj) + hEffM(I-1,J-1,bi,bj)) |
| 112 |
ENDDO |
| 113 |
ENDDO |
| 114 |
C evaluate divergence of stress and apply to forcing |
| 115 |
DO J=1,sNy |
| 116 |
DO I=1,sNx |
| 117 |
FX = ( sig11(I ,J ) * _dyF(I ,J ,bi,bj) |
| 118 |
& - sig11(I-1,J ) * _dyF(I-1,J ,bi,bj) |
| 119 |
& + sig12(I ,J+1) * _dxV(I ,J+1,bi,bj) |
| 120 |
& - sig12(I ,J ) * _dxV(I ,J ,bi,bj) |
| 121 |
& ) * recip_rAw(I,J,bi,bj) |
| 122 |
FY = ( sig22(I ,J ) * _dxF(I ,J ,bi,bj) |
| 123 |
& - sig22(I ,J-1) * _dxF(I ,J-1,bi,bj) |
| 124 |
& + sig12(I+1,J ) * _dyU(I+1,J ,bi,bj) |
| 125 |
& - sig12(I ,J ) * _dyU(I ,J ,bi,bj) |
| 126 |
& ) * recip_rAs(I,J,bi,bj) |
| 127 |
C average wind stress over ice and ocean and apply averaged wind |
| 128 |
C stress and internal ice stresses to surface layer of ocean |
| 129 |
areaW = 0.5 * (AREA(I,J,1,bi,bj) + AREA(I-1,J,1,bi,bj)) |
| 130 |
& * SEAICEstressFactor |
| 131 |
areaS = 0.5 * (AREA(I,J,1,bi,bj) + AREA(I,J-1,1,bi,bj)) |
| 132 |
& * SEAICEstressFactor |
| 133 |
fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj) |
| 134 |
& + areaW*taux(I,J,bi,bj) |
| 135 |
& + FX * SEAICEstressFactor |
| 136 |
fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj) |
| 137 |
& + areaS*tauy(I,J,bi,bj) |
| 138 |
& + FY * SEAICEstressFactor |
| 139 |
C save stress divergence for later |
| 140 |
#ifdef SEAICE_ALLOW_EVP |
| 141 |
stressDivergenceX(I,J,bi,bj) = FX |
| 142 |
stressDivergenceY(I,J,bi,bj) = FY |
| 143 |
#endif /* SEAICE_ALLOW_EVP */ |
| 144 |
ENDDO |
| 145 |
ENDDO |
| 146 |
ELSE |
| 147 |
#ifdef SEAICE_ALLOW_EVP |
| 148 |
DO J=1,sNy |
| 149 |
DO I=1,sNx |
| 150 |
C average wind stress over ice and ocean and apply averaged wind |
| 151 |
C stress and internal ice stresses to surface layer of ocean |
| 152 |
areaW = 0.5 * (AREA(I,J,1,bi,bj) + AREA(I-1,J,1,bi,bj)) |
| 153 |
& * SEAICEstressFactor |
| 154 |
areaS = 0.5 * (AREA(I,J,1,bi,bj) + AREA(I,J-1,1,bi,bj)) |
| 155 |
& * SEAICEstressFactor |
| 156 |
fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj) |
| 157 |
& + areaW*taux(I,J,bi,bj) |
| 158 |
& + stressDivergenceX(I,J,bi,bj) * SEAICEstressFactor |
| 159 |
fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj) |
| 160 |
& + areaS*tauy(I,J,bi,bj) |
| 161 |
& + stressDivergenceY(I,J,bi,bj) * SEAICEstressFactor |
| 162 |
ENDDO |
| 163 |
ENDDO |
| 164 |
#endif /* SEAICE_ALLOW_EVP */ |
| 165 |
ENDIF |
| 166 |
ENDDO |
| 167 |
ENDDO |
| 168 |
|
| 169 |
ELSE |
| 170 |
C else: useHB87StressCoupling=F |
| 171 |
|
| 172 |
C-- Compute ice-affected wind stress (interpolate to U/V-points) |
| 173 |
C by averaging wind stress and ice-ocean stress according to |
| 174 |
C ice cover |
| 175 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 176 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 177 |
DO j=1,sNy |
| 178 |
DO i=1,sNx |
| 179 |
fuIceLoc=HALF*( DWATN(I,J,bi,bj)+DWATN(I-1,J,bi,bj) )* |
| 180 |
& COSWAT * |
| 181 |
& ( UICE(I,J,1,bi,bj)-uVel(I,J,1,bi,bj) ) |
| 182 |
& - SIGN(SINWAT, _fCori(I,J,bi,bj)) * 0.5 _d 0 * |
| 183 |
& ( DWATN(I ,J,bi,bj) * |
| 184 |
& 0.5 _d 0*(vIce(I ,J ,1,bi,bj)-vVel(I ,J ,1,bi,bj) |
| 185 |
& +vIce(I ,J+1,1,bi,bj)-vVel(I ,J+1,1,bi,bj)) |
| 186 |
& + DWATN(I-1,J,bi,bj) * |
| 187 |
& 0.5 _d 0*(vIce(I-1,J ,1,bi,bj)-vVel(I-1,J ,1,bi,bj) |
| 188 |
& +vIce(I-1,J+1,1,bi,bj)-vVel(I-1,J+1,1,bi,bj)) |
| 189 |
& ) |
| 190 |
fvIceLoc=HALF*( DWATN(I,J,bi,bj)+DWATN(I,J-1,bi,bj) )* |
| 191 |
& COSWAT * |
| 192 |
& ( VICE(I,J,1,bi,bj)-vVel(I,J,1,bi,bj) ) |
| 193 |
& + SIGN(SINWAT, _fCori(I,J,bi,bj)) * 0.5 _d 0 * |
| 194 |
& ( DWATN(I,J ,bi,bj) * |
| 195 |
& 0.5 _d 0*(uIce(I ,J ,1,bi,bj)-uVel(I ,J ,1,bi,bj) |
| 196 |
& +uIce(I+1,J ,1,bi,bj)-uVel(I+1,J ,1,bi,bj)) |
| 197 |
& + DWATN(I,J-1,bi,bj) * |
| 198 |
& 0.5 _d 0*(uIce(I ,J-1,1,bi,bj)-uVel(I ,J-1,1,bi,bj) |
| 199 |
& +uIce(I+1,J-1,1,bi,bj)-uVel(I+1,J-1,1,bi,bj)) |
| 200 |
& ) |
| 201 |
areaW = 0.5 _d 0 * (AREA(I,J,1,bi,bj) + AREA(I-1,J,1,bi,bj)) |
| 202 |
& * SEAICEstressFactor |
| 203 |
areaS = 0.5 _d 0 * (AREA(I,J,1,bi,bj) + AREA(I,J-1,1,bi,bj)) |
| 204 |
& * SEAICEstressFactor |
| 205 |
fu(I,J,bi,bj)=(ONE-areaW)*fu(I,J,bi,bj)+areaW*fuIceLoc |
| 206 |
fv(I,J,bi,bj)=(ONE-areaS)*fv(I,J,bi,bj)+areaS*fvIceLoc |
| 207 |
ENDDO |
| 208 |
ENDDO |
| 209 |
ENDDO |
| 210 |
ENDDO |
| 211 |
ENDIF |
| 212 |
CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid) |
| 213 |
|
| 214 |
#endif /* SEAICE_CGRID */ |
| 215 |
|
| 216 |
RETURN |
| 217 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph