| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_tracer_phys.F,v 1.8 2012/03/05 14:52:16 gforget Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "SEAICE_OPTIONS.h" |
| 5 |
|
| 6 |
CStartOfInterface |
| 7 |
SUBROUTINE SEAICE_TRACER_PHYS( myTime, myIter, myThid ) |
| 8 |
C *=======================================================* |
| 9 |
C | SUBROUTINE seaice_tracer_phys |
| 10 |
C | o Time step SItr/SItrEFF as a result of |
| 11 |
C | seaice thermodynamics and specific tracer physics |
| 12 |
C *=======================================================* |
| 13 |
IMPLICIT NONE |
| 14 |
|
| 15 |
C === Global variables === |
| 16 |
#include "SIZE.h" |
| 17 |
#include "EEPARAMS.h" |
| 18 |
#include "FFIELDS.h" |
| 19 |
#include "DYNVARS.h" |
| 20 |
#include "SEAICE_SIZE.h" |
| 21 |
#include "SEAICE.h" |
| 22 |
#include "SEAICE_PARAMS.h" |
| 23 |
#include "SEAICE_TRACER.h" |
| 24 |
#ifdef ALLOW_SALT_PLUME |
| 25 |
# include "SALT_PLUME.h" |
| 26 |
#endif |
| 27 |
|
| 28 |
C === Routine arguments === |
| 29 |
C INPUT: |
| 30 |
C myTime :: Simulation time |
| 31 |
C myIter :: Simulation timestep number |
| 32 |
C myThid :: Thread no. that called this routine. |
| 33 |
C OUTPUT: |
| 34 |
_RL myTime |
| 35 |
INTEGER myIter, myThid |
| 36 |
CEndOfInterface |
| 37 |
|
| 38 |
C === Local variables === |
| 39 |
#ifdef ALLOW_SITRACER |
| 40 |
|
| 41 |
INTEGER iTr, jTh, I, J, bi, bj, ks |
| 42 |
_RL SItrFromOcean (1:sNx,1:sNy) |
| 43 |
_RL SItrFromFlood (1:sNx,1:sNy) |
| 44 |
_RL HEFFprev, HEFFpost, growFact, meltPart, tmpscal1 |
| 45 |
_RL SItrExpand (1:sNx,1:sNy) |
| 46 |
_RL AREAprev, AREApost, expandFact |
| 47 |
CHARACTER*8 diagName |
| 48 |
|
| 49 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 50 |
_RL DIAGarray (1:sNx,1:sNy,Nr) |
| 51 |
#endif |
| 52 |
|
| 53 |
cgf for now I do not fully account for ocean-ice fluxes of tracer |
| 54 |
cgf -> I just prescribe it consistent with age tracer |
| 55 |
cgf eventually I will need to handle them as function params |
| 56 |
|
| 57 |
ks=1 |
| 58 |
|
| 59 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 60 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 61 |
DO iTr=1,SItrNumInUse |
| 62 |
|
| 63 |
c 0) set ice-ocean and ice-snow exchange values |
| 64 |
c ============================================= |
| 65 |
DO J=1,sNy |
| 66 |
DO I=1,sNx |
| 67 |
SItrFromOcean(i,j)=SItrFromOcean0(iTr) |
| 68 |
SItrFromFlood(i,j)=SItrFromFlood0(iTr) |
| 69 |
SItrExpand(i,j)=SItrExpand0(iTr) |
| 70 |
ENDDO |
| 71 |
ENDDO |
| 72 |
c salinity tracer: |
| 73 |
if ( (SItrName(iTr).EQ.'salinity').AND. |
| 74 |
& (SItrFromOceanFrac(iTr).GT.ZERO) ) then |
| 75 |
DO J=1,sNy |
| 76 |
DO I=1,sNx |
| 77 |
SItrFromOcean(i,j)=SItrFromOceanFrac(iTr)*salt(I,j,ks,bi,bj) |
| 78 |
SItrFromFlood(i,j)=SItrFromFloodFrac(iTr)*salt(I,j,ks,bi,bj) |
| 79 |
ENDDO |
| 80 |
ENDDO |
| 81 |
endif |
| 82 |
c 1) seaice thermodynamics processes |
| 83 |
c ================================== |
| 84 |
if (SItrMate(iTr).EQ.'HEFF') then |
| 85 |
DO J=1,sNy |
| 86 |
DO I=1,sNx |
| 87 |
HEFFprev=SItrHEFF(i,j,bi,bj,1) |
| 88 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 89 |
DIAGarray(I,J,5+(iTr-1)*5) = |
| 90 |
& HEFFprev*SItracer(i,j,bi,bj,iTr) + SItrBucket(i,j,bi,bj,iTr) |
| 91 |
#endif |
| 92 |
c apply the sequence of thermodynamics increments to actual traceur |
| 93 |
c (see seaice_growth.F) |
| 94 |
c (jTh=1 tendency due to ice-ocean interaction) |
| 95 |
c (jTh=2 tendency due to the atmosphere, over ice covered part) |
| 96 |
c (jTh=3 tendency due to the atmosphere, over open water part) |
| 97 |
c (jTh=4 tendency due to flooding) |
| 98 |
DO jTh=1,3 |
| 99 |
HEFFprev=SItrHEFF(i,j,bi,bj,jTh) |
| 100 |
HEFFpost=SItrHEFF(i,j,bi,bj,jTh+1) |
| 101 |
c compute ratio in [0. 1.] range for either growth or melt |
| 102 |
growFact=1. _d 0 |
| 103 |
meltPart=0. _d 0 |
| 104 |
if (HEFFpost.GT.HEFFprev) growFact=HEFFprev/HEFFpost |
| 105 |
if (HEFFpost.LT.HEFFprev) meltPart=HEFFprev-HEFFpost |
| 106 |
c update SItr accordingly |
| 107 |
SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*growFact |
| 108 |
& +SItrFromOcean(i,j)*(1. _d 0 - growFact) |
| 109 |
SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
| 110 |
& -HEFFpost*SItrFromOcean(i,j)*(1. _d 0 - growFact) |
| 111 |
SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
| 112 |
& +meltPart*SItracer(i,j,bi,bj,iTr) |
| 113 |
ENDDO |
| 114 |
c apply flooding term |
| 115 |
growFact=1. _d 0 |
| 116 |
HEFFprev=SItrHEFF(i,j,bi,bj,4) |
| 117 |
HEFFpost=SItrHEFF(i,j,bi,bj,5) |
| 118 |
if (HEFFpost.GT.HEFFprev) growFact=HEFFprev/HEFFpost |
| 119 |
SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*growFact |
| 120 |
& +SItrFromFlood(i,j) *(1. _d 0 - growFact) |
| 121 |
c rk: flooding can only imply an ocean-ice tracer exchange, as long |
| 122 |
c as we dont have snow tracers, so it goes through SItrBucket. |
| 123 |
SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
| 124 |
& -HEFFpost*SItrFromFlood(i,j)*(1. _d 0 - growFact) |
| 125 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 126 |
DIAGarray(I,J,5+(iTr-1)*5) = HEFFpost*SItracer(i,j,bi,bj,iTr) |
| 127 |
& +SItrBucket(i,j,bi,bj,iTr)-DIAGarray(I,J,5+(iTr-1)*5) |
| 128 |
#endif |
| 129 |
ENDDO |
| 130 |
ENDDO |
| 131 |
c TAF? if (SItrMate(iTr).EQ.'AREA') then |
| 132 |
else |
| 133 |
c 1) or seaice cover expansion |
| 134 |
c ============================ |
| 135 |
c this is much simpler than for ice volume/mass tracers, because |
| 136 |
c properties of the ice surface are not be conserved across the |
| 137 |
c ocean-ice system, the contraction/expansion terms are all |
| 138 |
c simultaneous (which is sane), and the only generic effect |
| 139 |
c is due to expansion (new cover). |
| 140 |
DO J=1,sNy |
| 141 |
DO I=1,sNx |
| 142 |
c apply expansion |
| 143 |
AREAprev=SItrAREA(i,j,bi,bj,2) |
| 144 |
AREApost=SItrAREA(i,j,bi,bj,3) |
| 145 |
c compute ratio in [0. 1.] range for expansion/contraction |
| 146 |
expandFact=1. _d 0 |
| 147 |
if (AREApost.GT.AREAprev) expandFact=AREAprev/AREApost |
| 148 |
c update SItr accordingly |
| 149 |
SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*expandFact |
| 150 |
& +SItrExpand(i,j)*(1. _d 0 - expandFact) |
| 151 |
ENDDO |
| 152 |
ENDDO |
| 153 |
endif |
| 154 |
c 2) very ice tracer processes |
| 155 |
c ============================ |
| 156 |
if (SItrName(iTr).EQ.'age') then |
| 157 |
c age tracer: grow old as time passes by |
| 158 |
DO J=1,sNy |
| 159 |
DO I=1,sNx |
| 160 |
if (( (SItrHEFF(i,j,bi,bj,5).GT.0. _d 0).AND.(SItrMate(iTr) |
| 161 |
& .EQ.'HEFF') ).OR.( (SItrAREA(i,j,bi,bj,3).GT.0. _d 0).AND. |
| 162 |
& (SItrMate(iTr).EQ.'AREA') )) then |
| 163 |
SItracer(i,j,bi,bj,iTr)= |
| 164 |
& SItracer(i,j,bi,bj,iTr)+SEAICE_deltaTtherm |
| 165 |
else |
| 166 |
SItracer(i,j,bi,bj,iTr)=0. _d 0 |
| 167 |
endif |
| 168 |
ENDDO |
| 169 |
ENDDO |
| 170 |
elseif (SItrName(iTr).EQ.'salinity') then |
| 171 |
c salinity tracer: no specific process |
| 172 |
elseif (SItrName(iTr).EQ.'one') then |
| 173 |
c "ice concentration" tracer: no specific process |
| 174 |
elseif (SItrName(iTr).EQ.'ridge') then |
| 175 |
c simple, made up, ice surface roughness index prototype |
| 176 |
DO J=1,sNy |
| 177 |
DO I=1,sNx |
| 178 |
c ridging increases roughness |
| 179 |
SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)+ |
| 180 |
& MAX(0. _d 0, SItrAREA(i,j,bi,bj,1)-SItrAREA(i,j,bi,bj,2)) |
| 181 |
c ice melt reduces ridges/roughness |
| 182 |
HEFFprev=SItrHEFF(i,j,bi,bj,1) |
| 183 |
HEFFpost=SItrHEFF(i,j,bi,bj,4) |
| 184 |
tmpscal1=1. _d 0 |
| 185 |
if (HEFFprev.GT.HEFFpost) tmpscal1=HEFFpost/HEFFprev |
| 186 |
SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*tmpscal1 |
| 187 |
ENDDO |
| 188 |
ENDDO |
| 189 |
endif |
| 190 |
c 3) ice-ocean tracer exchange/mapping to external variables |
| 191 |
c ========================================================== |
| 192 |
#ifdef ALLOW_DIAGNOSTICS |
| 193 |
if (SItrMate(iTr).EQ.'HEFF') then |
| 194 |
WRITE(diagName,'(A4,I2.2,A2)') 'SItr',iTr,'Fx' |
| 195 |
tmpscal1=-ONE/SEAICE_deltaTtherm*SEAICE_rhoIce |
| 196 |
CALL DIAGNOSTICS_SCALE_FILL(SItrBucket(1-OLx,1-OLy,bi,bj,iTr), |
| 197 |
& tmpscal1, 1, diagName,0,1,2,bi,bj,myThid) |
| 198 |
endif |
| 199 |
#endif |
| 200 |
|
| 201 |
if ( (SItrName(iTr).EQ.'salinity').AND. |
| 202 |
& (SEAICE_salinityTracer) ) then |
| 203 |
c salinity tracer: salt flux |
| 204 |
DO J=1,sNy |
| 205 |
DO I=1,sNx |
| 206 |
saltFlux(I,J,bi,bj) = - SItrBucket(i,j,bi,bj,iTr) |
| 207 |
& *HEFFM(I,J,bi,bj)/SEAICE_deltaTtherm*SEAICE_rhoIce |
| 208 |
c note: at this point of the time step, that is the correct sign |
| 209 |
#ifdef ALLOW_SALT_PLUME |
| 210 |
c should work for both constant and variable ice salinity -- to be tested |
| 211 |
saltPlumeFlux(I,J,bi,bj) = MAX(ZERO,saltFlux(I,J,bi,bj)) |
| 212 |
& *SPsalFRAC*(salt(I,j,ks,bi,bj)-SItrFromOcean(i,j)) |
| 213 |
#endif |
| 214 |
ENDDO |
| 215 |
ENDDO |
| 216 |
endif |
| 217 |
|
| 218 |
DO J=1,sNy |
| 219 |
DO I=1,sNx |
| 220 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 221 |
DIAGarray(I,J,4+(iTr-1)*5) = - SItrBucket(i,j,bi,bj,iTr) |
| 222 |
& *HEFFM(I,J,bi,bj)/SEAICE_deltaTtherm*SEAICE_rhoIce |
| 223 |
#endif |
| 224 |
c empty bucket |
| 225 |
SItrBucket(i,j,bi,bj,iTr)=0. _d 0 |
| 226 |
ENDDO |
| 227 |
ENDDO |
| 228 |
|
| 229 |
c TAF? elseif (SItrMate(iTr).EQ.'AREA') then |
| 230 |
|
| 231 |
c 4) diagnostics |
| 232 |
c ============== |
| 233 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 234 |
if (SItrMate(iTr).EQ.'HEFF') then |
| 235 |
DO J=1,sNy |
| 236 |
DO I=1,sNx |
| 237 |
HEFFpost=SItrHEFF(i,j,bi,bj,5) |
| 238 |
DIAGarray(I,J,1+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr) |
| 239 |
DIAGarray(I,J,2+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr)*HEFFpost |
| 240 |
c DIAGarray(:,:,3) is the term of comparison for DIAGarray(:,:,2) |
| 241 |
if (SItrName(iTr).EQ.'salinity') then |
| 242 |
DIAGarray(I,J,3+(iTr-1)*5) = HSALT(i,j,bi,bj)/SEAICE_rhoIce |
| 243 |
elseif (SItrName(iTr).EQ.'one') then |
| 244 |
DIAGarray(I,J,3+(iTr-1)*5) = HEFFpost |
| 245 |
endif |
| 246 |
c DIAGarray(:,:,4) allows check of conservation : del(SItrBucket)+del(SItr*HEFF)=0. over do_phys |
| 247 |
c DIAGarray(:,:,5) is the tracer flux from the ocean (<0 incr. ocean tracer) |
| 248 |
ENDDO |
| 249 |
ENDDO |
| 250 |
else |
| 251 |
DO J=1,sNy |
| 252 |
DO I=1,sNx |
| 253 |
AREApost=SItrAREA(i,j,bi,bj,3) |
| 254 |
DIAGarray(I,J,1+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr) |
| 255 |
DIAGarray(I,J,2+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr)*AREApost |
| 256 |
ENDDO |
| 257 |
ENDDO |
| 258 |
endif |
| 259 |
#endif |
| 260 |
ENDDO |
| 261 |
#ifdef ALLOW_SITRACER_DEBUG_DIAG |
| 262 |
c CALL DIAGNOSTICS_FILL(DIAGarray,'UDIAG1 ',0,Nr,3,bi,bj,myThid) |
| 263 |
#endif |
| 264 |
ENDDO |
| 265 |
ENDDO |
| 266 |
|
| 267 |
#endif /* ALLOW_SITRACER */ |
| 268 |
|
| 269 |
RETURN |
| 270 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph