| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.10 2005/07/10 01:24:25 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "THSICE_OPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: THSICE_STEP_FWD |
| 8 |
C !INTERFACE: |
| 9 |
SUBROUTINE THSICE_STEP_FWD( |
| 10 |
I bi, bj, iMin, iMax, jMin, jMax, |
| 11 |
I prcAtm, |
| 12 |
U evpAtm, flxSW, |
| 13 |
I myTime, myIter, myThid ) |
| 14 |
C !DESCRIPTION: \bv |
| 15 |
C *==========================================================* |
| 16 |
C | S/R THSICE_STEP_FWD |
| 17 |
C | o Step Forward Therm-SeaIce model. |
| 18 |
C *==========================================================* |
| 19 |
C \ev |
| 20 |
|
| 21 |
C !USES: |
| 22 |
IMPLICIT NONE |
| 23 |
|
| 24 |
C === Global variables === |
| 25 |
#include "SIZE.h" |
| 26 |
#include "EEPARAMS.h" |
| 27 |
#include "PARAMS.h" |
| 28 |
#include "FFIELDS.h" |
| 29 |
#include "THSICE_SIZE.h" |
| 30 |
#include "THSICE_PARAMS.h" |
| 31 |
#include "THSICE_VARS.h" |
| 32 |
#include "THSICE_TAVE.h" |
| 33 |
|
| 34 |
C !INPUT/OUTPUT PARAMETERS: |
| 35 |
C === Routine arguments === |
| 36 |
C bi,bj :: tile indices |
| 37 |
C iMin,iMax :: computation domain: 1rst index range |
| 38 |
C jMin,jMax :: computation domain: 2nd index range |
| 39 |
C- input: |
| 40 |
C prcAtm :: total precip from the atmosphere [kg/m2/s] |
| 41 |
C evpAtm :: (Inp) evaporation to the atmosphere [kg/m2/s] (>0 if evaporate) |
| 42 |
C flxSW :: (Inp) short-wave heat flux (+=down): downward comp. only |
| 43 |
C (part.1), becomes net SW flux into ocean (part.2). |
| 44 |
C- output |
| 45 |
C evpAtm :: (Out) net fresh-water flux (E-P) from the atmosphere [m/s] (+=up) |
| 46 |
C flxSW :: (Out) net surf. heat flux from the atmosphere [W/m2], (+=down) |
| 47 |
C myTime :: time counter for this thread |
| 48 |
C myIter :: iteration counter for this thread |
| 49 |
C myThid :: thread number for this instance of the routine. |
| 50 |
INTEGER bi,bj |
| 51 |
INTEGER iMin, iMax |
| 52 |
INTEGER jMin, jMax |
| 53 |
_RL prcAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 54 |
_RL evpAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 55 |
_RL flxSW (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 56 |
_RL myTime |
| 57 |
INTEGER myIter |
| 58 |
INTEGER myThid |
| 59 |
CEOP |
| 60 |
|
| 61 |
#ifdef ALLOW_THSICE |
| 62 |
C !LOCAL VARIABLES: |
| 63 |
C === Local variables === |
| 64 |
C snowPr :: snow precipitation [kg/m2/s] |
| 65 |
C agingTime :: aging time scale (s) |
| 66 |
C ageFac :: snow aging factor [1] |
| 67 |
C albedo :: surface albedo [0-1] |
| 68 |
C flxAtm :: net heat flux from the atmosphere (+=down) [W/m2] |
| 69 |
C frwAtm :: net fresh-water flux (E-P) to the atmosphere [kg/m2/s] |
| 70 |
C Fbot :: the oceanic heat flux already incorporated (ice_therm) |
| 71 |
C flx2oc :: net heat flux from the ice to the ocean (+=down) [W/m2] |
| 72 |
C frw2oc :: fresh-water flux from the ice to the ocean |
| 73 |
C fsalt :: mass salt flux to the ocean |
| 74 |
C frzmltMxL :: ocean mixed-layer freezing/melting potential [W/m2] |
| 75 |
C TFrzOce :: sea-water freezing temperature [oC] (function of S) |
| 76 |
INTEGER i,j |
| 77 |
_RL snowPr |
| 78 |
_RL agingTime, ageFac |
| 79 |
_RL albedo |
| 80 |
_RL flxAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 81 |
_RL frwAtm |
| 82 |
_RL flx2oc |
| 83 |
_RL frw2oc |
| 84 |
_RL fsalt |
| 85 |
_RL TFrzOce, cphm, frzmltMxL |
| 86 |
_RL Fbot, esurp |
| 87 |
_RL opFrac, icFrac |
| 88 |
_RL oceV2s, oceTs |
| 89 |
_RL compact, hIce, hSnow, Tsf, Tice(nlyr), qicen(nlyr) |
| 90 |
_RL tmpflx(0:2), tmpdTs |
| 91 |
#ifdef ALLOW_DIAGNOSTICS |
| 92 |
_RL tmpFac |
| 93 |
#endif |
| 94 |
|
| 95 |
LOGICAL dBug |
| 96 |
|
| 97 |
1010 FORMAT(A,1P4E11.3) |
| 98 |
dBug = .FALSE. |
| 99 |
C- Initialise flxAtm |
| 100 |
DO j = 1-Oly, sNy+Oly |
| 101 |
DO i = 1-Olx, sNx+Olx |
| 102 |
flxAtm(i,j) = 0. |
| 103 |
ENDDO |
| 104 |
ENDDO |
| 105 |
|
| 106 |
IF ( fluidIsWater ) THEN |
| 107 |
DO j = jMin, jMax |
| 108 |
DO i = iMin, iMax |
| 109 |
c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.11 ) |
| 110 |
|
| 111 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 112 |
C part.1 : ice-covered fraction ; |
| 113 |
C Solve for surface and ice temperature (implicitly) ; compute surf. fluxes |
| 114 |
C------- |
| 115 |
IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
| 116 |
icFrac = iceMask(i,j,bi,bj) |
| 117 |
TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
| 118 |
hIce = iceHeight(i,j,bi,bj) |
| 119 |
hSnow = snowHeight(i,j,bi,bj) |
| 120 |
Tsf = Tsrf(i,j,bi,bj) |
| 121 |
qicen(1)= Qice1(i,j,bi,bj) |
| 122 |
qicen(2)= Qice2(i,j,bi,bj) |
| 123 |
IF ( dBug ) THEN |
| 124 |
WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj |
| 125 |
WRITE(6,1010) 'ThSI_FWD:-0- iceMask, hIc, hSn, Tsf =', |
| 126 |
& icFrac, hIce,hSnow,Tsf |
| 127 |
ENDIF |
| 128 |
|
| 129 |
CALL THSICE_ALBEDO( |
| 130 |
I hIce, hSnow, Tsf, snowAge(i,j,bi,bj), |
| 131 |
O albedo, |
| 132 |
I myThid ) |
| 133 |
flxSW(i,j) = flxSW(i,j)*(1. _d 0 - albedo) |
| 134 |
|
| 135 |
CALL THSICE_SOLVE4TEMP( |
| 136 |
I useBulkforce, tmpflx, TFrzOce, hIce, hSnow, |
| 137 |
U flxSW(i,j), Tsf, qicen, |
| 138 |
O Tice, sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), |
| 139 |
O tmpdTs, flxAtm(i,j), evpAtm(i,j), |
| 140 |
I i,j, bi,bj, myThid) |
| 141 |
|
| 142 |
#ifdef SHORTWAVE_HEATING |
| 143 |
C-- Update Fluxes : |
| 144 |
opFrac= 1. _d 0-icFrac |
| 145 |
Qsw(i,j,bi,bj)=-icFrac*flxSW(i,j) +opFrac*Qsw(i,j,bi,bj) |
| 146 |
#endif |
| 147 |
C-- Update Sea-Ice state : |
| 148 |
Tsrf(i,j,bi,bj) =Tsf |
| 149 |
Tice1(i,j,bi,bj)=Tice(1) |
| 150 |
Tice2(i,j,bi,bj)=Tice(2) |
| 151 |
Qice1(i,j,bi,bj)=qicen(1) |
| 152 |
Qice2(i,j,bi,bj)=qicen(2) |
| 153 |
siceAlb(i,j,bi,bj) = icFrac*albedo |
| 154 |
IF ( dBug ) THEN |
| 155 |
WRITE(6,1010) 'ThSI_FWD: Tsf, Tice(1,2), frzmltMxL =', |
| 156 |
& Tsf, Tice, frzmltMxL |
| 157 |
WRITE(6,1010) 'ThSI_FWD: sHeat,fxCndBt, fxAtm,evAtm=', |
| 158 |
& sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), |
| 159 |
& flxAtm(i,j), evpAtm(i,j) |
| 160 |
ENDIF |
| 161 |
ENDIF |
| 162 |
ENDDO |
| 163 |
ENDDO |
| 164 |
ENDIF |
| 165 |
dBug = .FALSE. |
| 166 |
|
| 167 |
#ifdef ALLOW_DIAGNOSTICS |
| 168 |
IF ( useDiagnostics ) THEN |
| 169 |
tmpFac = 1. _d 0 |
| 170 |
CALL DIAGNOSTICS_FRACT_FILL( |
| 171 |
I snowPrc, iceMask,tmpFac,1,'SIsnwPrc', |
| 172 |
I 0,1,1,bi,bj,myThid) |
| 173 |
ENDIF |
| 174 |
#endif /* ALLOW_DIAGNOSTICS */ |
| 175 |
|
| 176 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 177 |
C part.2 : ice-covered fraction ; |
| 178 |
C change in ice/snow thickness and ice-fraction |
| 179 |
C note: can only reduce the ice-fraction but not increase it. |
| 180 |
C------- |
| 181 |
agingTime = 50. _d 0 * 86400. _d 0 |
| 182 |
ageFac = 1. _d 0 - thSIce_deltaT/agingTime |
| 183 |
DO j = jMin, jMax |
| 184 |
DO i = iMin, iMax |
| 185 |
c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.11 ) |
| 186 |
|
| 187 |
TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
| 188 |
oceTs = tOceMxL(i,j,bi,bj) |
| 189 |
cphm = cpwater*rhosw*hOceMxL(i,j,bi,bj) |
| 190 |
frzmltMxL = (TFrzOce-oceTs)*cphm/ocean_deltaT |
| 191 |
|
| 192 |
Fbot = 0. _d 0 |
| 193 |
saltFlux(i,j,bi,bj) = 0. _d 0 |
| 194 |
compact= iceMask(i,j,bi,bj) |
| 195 |
C------- |
| 196 |
IF (dBug .AND. (frzmltMxL.GT.0. .OR. compact.GT.0.) ) THEN |
| 197 |
WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj |
| 198 |
WRITE(6,1010) 'ThSI_FWD:-1- iceMask, hIc, hSn, Tsf =', |
| 199 |
& compact, iceHeight(i,j,bi,bj), |
| 200 |
& snowHeight(i,j,bi,bj), Tsrf(i,j,bi,bj) |
| 201 |
WRITE(6,1010) 'ThSI_FWD: ocTs,TFrzOce,frzmltMxL,Qnet=', |
| 202 |
& oceTs, TFrzOce, frzmltMxL,Qnet(i,j,bi,bj) |
| 203 |
ENDIF |
| 204 |
C------- |
| 205 |
IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
| 206 |
|
| 207 |
oceV2s = v2ocMxL(i,j,bi,bj) |
| 208 |
snowPr = snowPrc(i,j,bi,bj) |
| 209 |
hIce = iceHeight(i,j,bi,bj) |
| 210 |
hSnow = snowHeight(i,j,bi,bj) |
| 211 |
Tsf = Tsrf(i,j,bi,bj) |
| 212 |
qicen(1)= Qice1(i,j,bi,bj) |
| 213 |
qicen(2)= Qice2(i,j,bi,bj) |
| 214 |
flx2oc = flxSW(i,j) |
| 215 |
|
| 216 |
CALL THSICE_CALC_THICKN( |
| 217 |
I frzmltMxL, TFrzOce, oceTs, oceV2s, snowPr, |
| 218 |
I sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), evpAtm(i,j), |
| 219 |
U compact, hIce, hSnow, Tsf, qicen, flx2oc, |
| 220 |
O frw2oc, fsalt, Fbot, |
| 221 |
I dBug, myThid) |
| 222 |
|
| 223 |
C- note : snowPr was not supposed to be modified in THSICE_THERM ; |
| 224 |
C but to reproduce old results, is reset to zero if Tsf >= 0 |
| 225 |
snowPrc(i,j,bi,bj) = snowPr |
| 226 |
|
| 227 |
C-- Snow aging : |
| 228 |
snowAge(i,j,bi,bj) = thSIce_deltaT |
| 229 |
& + snowAge(i,j,bi,bj)*ageFac |
| 230 |
IF ( snowPr.GT.0. _d 0 ) |
| 231 |
& snowAge(i,j,bi,bj) = snowAge(i,j,bi,bj) |
| 232 |
& * EXP( -(thSIce_deltaT*snowPr/rhos)/hNewSnowAge ) |
| 233 |
C-- |
| 234 |
|
| 235 |
C-- Diagnostic of Atmospheric Fluxes over sea-ice : |
| 236 |
frwAtm = evpAtm(i,j) - prcAtm(i,j) |
| 237 |
C note: Any flux of mass (here fresh water) that enter or leave the system |
| 238 |
C with a non zero energy HAS TO be counted: add snow precip. |
| 239 |
flxAtm(i,j) = flxAtm(i,j) - Lfresh*snowPrc(i,j,bi,bj) |
| 240 |
|
| 241 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 242 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: icFrac,flxAtm,evpAtm,flxSnw=', |
| 243 |
& iceMask(i,j,bi,bj),flxAtm(i,j),evpAtm(i,j),-Lfresh*snowPr |
| 244 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=', |
| 245 |
& compact,flx2oc,fsalt,frw2oc |
| 246 |
#ifdef CHECK_ENERGY_CONSERV |
| 247 |
icFrac = iceMask(i,j,bi,bj) |
| 248 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 0, |
| 249 |
I icFrac, compact, hIce, hSnow, qicen, |
| 250 |
I flx2oc, frw2oc, fsalt, flxAtm(i,j), frwAtm, |
| 251 |
I myTime, myIter, myThid ) |
| 252 |
#endif /* CHECK_ENERGY_CONSERV */ |
| 253 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 254 |
|
| 255 |
C-- Update Sea-Ice state : |
| 256 |
c iceMask(i,j,bi,bj)=compact |
| 257 |
iceHeight(i,j,bi,bj) = hIce |
| 258 |
snowHeight(i,j,bi,bj)= hSnow |
| 259 |
Tsrf(i,j,bi,bj) =Tsf |
| 260 |
Qice1(i,j,bi,bj)=qicen(1) |
| 261 |
Qice2(i,j,bi,bj)=qicen(2) |
| 262 |
|
| 263 |
C-- Net fluxes : |
| 264 |
frw2oc = frw2oc + (prcAtm(i,j)-snowPrc(i,j,bi,bj)) |
| 265 |
C- weighted average net fluxes: |
| 266 |
icFrac = iceMask(i,j,bi,bj) |
| 267 |
opFrac= 1. _d 0-icFrac |
| 268 |
flxAtm(i,j) = icFrac*flxAtm(i,j) - opFrac*Qnet(i,j,bi,bj) |
| 269 |
frwAtm = icFrac*frwAtm + opFrac*rhofw*EmPmR(i,j,bi,bj) |
| 270 |
Qnet(i,j,bi,bj)=-icFrac*flx2oc +opFrac*Qnet(i,j,bi,bj) |
| 271 |
EmPmR(i,j,bi,bj)=-icFrac*frw2oc/rhofw+opFrac*EmPmR(i,j,bi,bj) |
| 272 |
saltFlux(i,j,bi,bj)=-icFrac*fsalt |
| 273 |
|
| 274 |
IF (dBug) WRITE(6,1010) |
| 275 |
& 'ThSI_FWD:-3- compact, hIc, hSn, Qnet =', |
| 276 |
& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
| 277 |
|
| 278 |
ELSEIF (hOceMxL(i,j,bi,bj).gt.0. _d 0) THEN |
| 279 |
flxAtm(i,j) = -Qnet(i,j,bi,bj) |
| 280 |
frwAtm = rhofw*EmPmR(i,j,bi,bj) |
| 281 |
ELSE |
| 282 |
flxAtm(i,j) = 0. _d 0 |
| 283 |
frwAtm = 0. _d 0 |
| 284 |
ENDIF |
| 285 |
|
| 286 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 287 |
C part.3 : freezing of sea-water |
| 288 |
C over ice-free fraction and what is left from ice-covered fraction |
| 289 |
C------- |
| 290 |
c compact= iceMask(i,j,bi,bj) |
| 291 |
hIce = iceHeight(i,j,bi,bj) |
| 292 |
hSnow = snowHeight(i,j,bi,bj) |
| 293 |
|
| 294 |
esurp = frzmltMxL - Fbot*iceMask(i,j,bi,bj) |
| 295 |
IF (esurp.GT.0. _d 0) THEN |
| 296 |
icFrac = compact |
| 297 |
qicen(1)= Qice1(i,j,bi,bj) |
| 298 |
qicen(2)= Qice2(i,j,bi,bj) |
| 299 |
CALL THSICE_EXTEND( |
| 300 |
I esurp, TFrzOce, |
| 301 |
U oceTs, compact, hIce, hSnow, qicen, |
| 302 |
O flx2oc, frw2oc, fsalt, |
| 303 |
I dBug, myThid ) |
| 304 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 305 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=' |
| 306 |
& ,compact,flx2oc,fsalt,frw2oc |
| 307 |
#ifdef CHECK_ENERGY_CONSERV |
| 308 |
tmpflx(1) = 0. |
| 309 |
tmpflx(2) = 0. |
| 310 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 1, |
| 311 |
I icFrac, compact, hIce, hSnow, qicen, |
| 312 |
I flx2oc, frw2oc, fsalt, tmpflx(1), tmpflx(2), |
| 313 |
I myTime, myIter, myThid ) |
| 314 |
#endif /* CHECK_ENERGY_CONSERV */ |
| 315 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 316 |
C-- Update Sea-Ice state : |
| 317 |
IF ( compact.GT.0. _d 0 .AND. icFrac.EQ.0. _d 0) THEN |
| 318 |
Tsrf(i,j,bi,bj) = TFrzOce |
| 319 |
Tice1(i,j,bi,bj) = TFrzOce |
| 320 |
Tice2(i,j,bi,bj) = TFrzOce |
| 321 |
Qice1(i,j,bi,bj) = qicen(1) |
| 322 |
Qice2(i,j,bi,bj) = qicen(2) |
| 323 |
ENDIF |
| 324 |
iceHeight(i,j,bi,bj) = hIce |
| 325 |
snowHeight(i,j,bi,bj)= hSnow |
| 326 |
C-- Net fluxes : |
| 327 |
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc |
| 328 |
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc/rhofw |
| 329 |
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt |
| 330 |
|
| 331 |
IF (dBug) WRITE(6,1010) |
| 332 |
& 'ThSI_FWD:-4- compact, hIc, hSn, Qnet =', |
| 333 |
& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
| 334 |
C-- - if esurp > 0 : end |
| 335 |
ENDIF |
| 336 |
|
| 337 |
IF ( compact .GT. 0. _d 0 ) THEN |
| 338 |
iceMask(i,j,bi,bj)=compact |
| 339 |
IF ( hSnow .EQ. 0. _d 0 ) snowAge(i,j,bi,bj) = 0. _d 0 |
| 340 |
ELSE |
| 341 |
iceMask(i,j,bi,bj) = 0. _d 0 |
| 342 |
iceHeight(i,j,bi,bj)= 0. _d 0 |
| 343 |
snowHeight(i,j,bi,bj)=0. _d 0 |
| 344 |
snowAge(i,j,bi,bj) = 0. _d 0 |
| 345 |
Tsrf(i,j,bi,bj) = oceTs |
| 346 |
Tice1(i,j,bi,bj) = 0. _d 0 |
| 347 |
Tice2(i,j,bi,bj) = 0. _d 0 |
| 348 |
Qice1(i,j,bi,bj) = 0. _d 0 |
| 349 |
Qice2(i,j,bi,bj) = 0. _d 0 |
| 350 |
ENDIF |
| 351 |
|
| 352 |
C-- Return atmospheric fluxes in evpAtm & flxSW (same sign and units): |
| 353 |
evpAtm(i,j) = frwAtm |
| 354 |
flxSW (i,j) = flxAtm(i,j) |
| 355 |
|
| 356 |
#ifdef ATMOSPHERIC_LOADING |
| 357 |
C-- Compute Sea-Ice Loading (= mass of sea-ice + snow / area unit) |
| 358 |
sIceLoad(i,j,bi,bj) = ( snowHeight(i,j,bi,bj)*rhos |
| 359 |
& + iceHeight(i,j,bi,bj)*rhoi |
| 360 |
& )*iceMask(i,j,bi,bj) |
| 361 |
#endif |
| 362 |
|
| 363 |
ENDDO |
| 364 |
ENDDO |
| 365 |
|
| 366 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 367 |
#endif /* ALLOW_THSICE */ |
| 368 |
|
| 369 |
RETURN |
| 370 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph