| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/exf/exf_radiation.F,v 1.10 2012/12/08 15:24:13 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "EXF_OPTIONS.h" |
| 5 |
#ifdef ALLOW_AUTODIFF |
| 6 |
# include "AUTODIFF_OPTIONS.h" |
| 7 |
#endif |
| 8 |
|
| 9 |
SUBROUTINE EXF_RADIATION(myTime, myIter, myThid) |
| 10 |
|
| 11 |
C ================================================================== |
| 12 |
C SUBROUTINE exf_radiation |
| 13 |
C ================================================================== |
| 14 |
C |
| 15 |
C o Set radiative fluxes at the surface. |
| 16 |
C |
| 17 |
C ================================================================== |
| 18 |
C SUBROUTINE exf_radiation |
| 19 |
C ================================================================== |
| 20 |
|
| 21 |
IMPLICIT NONE |
| 22 |
|
| 23 |
C == global variables == |
| 24 |
|
| 25 |
#include "EEPARAMS.h" |
| 26 |
#include "SIZE.h" |
| 27 |
#include "PARAMS.h" |
| 28 |
#include "DYNVARS.h" |
| 29 |
#include "GRID.h" |
| 30 |
|
| 31 |
#include "EXF_PARAM.h" |
| 32 |
#include "EXF_FIELDS.h" |
| 33 |
#include "EXF_CONSTANTS.h" |
| 34 |
#ifdef ALLOW_AUTODIFF_TAMC |
| 35 |
# include "tamc.h" |
| 36 |
#endif |
| 37 |
|
| 38 |
C == routine arguments == |
| 39 |
|
| 40 |
_RL myTime |
| 41 |
INTEGER myIter |
| 42 |
INTEGER myThid |
| 43 |
|
| 44 |
#ifdef ALLOW_DOWNWARD_RADIATION |
| 45 |
C == local variables == |
| 46 |
|
| 47 |
INTEGER bi,bj |
| 48 |
INTEGER i,j |
| 49 |
#ifdef ALLOW_ATM_TEMP |
| 50 |
INTEGER ks, kl |
| 51 |
_RL Tsf, SSTtmp, TsfSq |
| 52 |
#endif |
| 53 |
|
| 54 |
C == end of interface == |
| 55 |
|
| 56 |
C-- Use atmospheric state to compute surface fluxes. |
| 57 |
|
| 58 |
C-- Compute net from downward and downward from net longwave and |
| 59 |
C shortwave radiation, IF needed. |
| 60 |
C lwflux = Stefan-Boltzmann constant * emissivity * SST - lwdown |
| 61 |
C swflux = - ( 1 - albedo ) * swdown |
| 62 |
|
| 63 |
#ifdef ALLOW_ATM_TEMP |
| 64 |
ks = 1 |
| 65 |
kl = 2 |
| 66 |
|
| 67 |
IF ( lwfluxfile .EQ. ' ' .AND. lwdownfile .NE. ' ' ) THEN |
| 68 |
C Loop over tiles. |
| 69 |
DO bj = myByLo(myThid),myByHi(myThid) |
| 70 |
DO bi = myBxLo(myThid),myBxHi(myThid) |
| 71 |
|
| 72 |
IF ( Nr.GE.2 .AND. sstExtrapol.GT.0. _d 0 ) THEN |
| 73 |
DO j = 1,sNy |
| 74 |
DO i = 1,sNx |
| 75 |
Tsf = theta(i,j,ks,bi,bj) + cen2kel |
| 76 |
SSTtmp = sstExtrapol |
| 77 |
& *( theta(i,j,ks,bi,bj)-theta(i,j,kl,bi,bj) ) |
| 78 |
& * maskC(i,j,kl,bi,bj) |
| 79 |
Tsf = Tsf + MAX( SSTtmp, 0. _d 0 ) |
| 80 |
TsfSq = Tsf*Tsf |
| 81 |
lwflux(i,j,bi,bj) = |
| 82 |
& ocean_emissivity*stefanBoltzmann*TsfSq*TsfSq |
| 83 |
& - lwdown(i,j,bi,bj) |
| 84 |
#ifdef EXF_LWDOWN_WITH_EMISSIVITY |
| 85 |
& *ocean_emissivity |
| 86 |
C the lw exitance (= out-going long wave radiation) is |
| 87 |
C emissivity*stefanBoltzmann*T^4 + rho*lwdown, where the |
| 88 |
C reflectivity rho = 1-emissivity for conservation reasons: |
| 89 |
C the sum of emissivity, reflectivity, and transmissivity must be |
| 90 |
C one, and transmissivity is zero in our case (long wave radiation |
| 91 |
C does not penetrate the ocean surface) |
| 92 |
#endif /* EXF_LWDOWN_WITH_EMISSIVITY */ |
| 93 |
ENDDO |
| 94 |
ENDDO |
| 95 |
ELSE |
| 96 |
DO j = 1,sNy |
| 97 |
DO i = 1,sNx |
| 98 |
lwflux(i,j,bi,bj) = |
| 99 |
& ocean_emissivity*stefanBoltzmann* |
| 100 |
& ((theta(i,j,ks,bi,bj)+cen2kel)**4) |
| 101 |
& - lwdown(i,j,bi,bj) |
| 102 |
#ifdef EXF_LWDOWN_WITH_EMISSIVITY |
| 103 |
& *ocean_emissivity |
| 104 |
C the lw exitance (= out-going long wave radiation) is |
| 105 |
C emissivity*stefanBoltzmann*T^4 + rho*lwdown, where the |
| 106 |
C reflectivity rho = 1-emissivity for conservation reasons: |
| 107 |
C the sum of emissivity, reflectivity, and transmissivity must be |
| 108 |
C one, and transmissivity is zero in our case (long wave radiation |
| 109 |
C does not penetrate the ocean surface) |
| 110 |
#endif /* EXF_LWDOWN_WITH_EMISSIVITY */ |
| 111 |
ENDDO |
| 112 |
ENDDO |
| 113 |
ENDIF |
| 114 |
|
| 115 |
C-- end bi,bj loops |
| 116 |
ENDDO |
| 117 |
ENDDO |
| 118 |
ENDIF |
| 119 |
|
| 120 |
C-jmc: commented out: no need to compute Downward-LW (not used) from Net-LW |
| 121 |
c IF ( lwfluxfile .NE. ' ' .AND. lwdownfile .EQ. ' ' ) THEN |
| 122 |
C Loop over tiles. |
| 123 |
c DO bj = myByLo(myThid),myByHi(myThid) |
| 124 |
c DO bi = myBxLo(myThid),myBxHi(myThid) |
| 125 |
c DO j = 1,sNy |
| 126 |
c DO i = 1,sNx |
| 127 |
c lwdown(i,j,bi,bj) = |
| 128 |
c & ocean_emissivity*stefanBoltzmann* |
| 129 |
c & ((theta(i,j,ks,bi,bj)+cen2kel)**4) |
| 130 |
c & - lwflux(i,j,bi,bj) |
| 131 |
c ENDDO |
| 132 |
c ENDDO |
| 133 |
c ENDDO |
| 134 |
c ENDDO |
| 135 |
c ENDIF |
| 136 |
#endif /* ALLOW_ATM_TEMP */ |
| 137 |
|
| 138 |
#if defined(ALLOW_ATM_TEMP) || defined(SHORTWAVE_HEATING) |
| 139 |
IF ( swfluxfile .EQ. ' ' .AND. swdownfile .NE. ' ' ) THEN |
| 140 |
#ifdef ALLOW_ZENITHANGLE |
| 141 |
IF ( useExfZenAlbedo .OR. useExfZenIncoming ) THEN |
| 142 |
CALL EXF_ZENITHANGLE(myTime, myIter, myThid) |
| 143 |
#ifdef ALLOW_AUTODIFF_TAMC |
| 144 |
ELSE |
| 145 |
DO bj = myByLo(myThid),myByHi(myThid) |
| 146 |
DO bi = myBxLo(myThid),myBxHi(myThid) |
| 147 |
DO j = 1,sNy |
| 148 |
DO i = 1,sNx |
| 149 |
zen_albedo (i,j,bi,bj) = 0. _d 0 |
| 150 |
zen_fsol_diurnal (i,j,bi,bj) = 0. _d 0 |
| 151 |
zen_fsol_daily (i,j,bi,bj) = 0. _d 0 |
| 152 |
ENDDO |
| 153 |
ENDDO |
| 154 |
ENDDO |
| 155 |
ENDDO |
| 156 |
#endif |
| 157 |
ENDIF |
| 158 |
#endif |
| 159 |
DO bj = myByLo(myThid),myByHi(myThid) |
| 160 |
DO bi = myBxLo(myThid),myBxHi(myThid) |
| 161 |
DO j = 1,sNy |
| 162 |
DO i = 1,sNx |
| 163 |
#ifdef ALLOW_ZENITHANGLE |
| 164 |
IF ( useExfZenAlbedo ) THEN |
| 165 |
swflux(i,j,bi,bj) = - swdown(i,j,bi,bj) * |
| 166 |
& (1.0-zen_albedo(i,j,bi,bj)) |
| 167 |
ELSE |
| 168 |
swflux(i,j,bi,bj) = - swdown(i,j,bi,bj) * |
| 169 |
& (1.0-exf_albedo) |
| 170 |
ENDIF |
| 171 |
#else |
| 172 |
swflux(i,j,bi,bj) = - swdown(i,j,bi,bj) * |
| 173 |
& (1.0-exf_albedo) |
| 174 |
#endif |
| 175 |
ENDDO |
| 176 |
ENDDO |
| 177 |
ENDDO |
| 178 |
ENDDO |
| 179 |
ENDIF |
| 180 |
C-jmc: commented out: no need to compute Downward-SW (not used) from Net-SW |
| 181 |
c IF ( swfluxfile .NE. ' ' .AND. swdownfile .EQ. ' ' ) THEN |
| 182 |
c DO bj = myByLo(myThid),myByHi(myThid) |
| 183 |
c DO bi = myBxLo(myThid),myBxHi(myThid) |
| 184 |
c DO j = 1,sNy |
| 185 |
c DO i = 1,sNx |
| 186 |
c swdown(i,j,bi,bj) = -swflux(i,j,bi,bj) / (1.0-exf_albedo) |
| 187 |
c ENDDO |
| 188 |
c ENDDO |
| 189 |
c ENDDO |
| 190 |
c ENDDO |
| 191 |
c ENDIF |
| 192 |
#endif |
| 193 |
|
| 194 |
#endif /* ALLOW_DOWNWARD_RADIATION */ |
| 195 |
|
| 196 |
RETURN |
| 197 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph