| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_budget_ocean.F,v 1.1 2006/12/14 08:36:20 mlosch Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "SEAICE_OPTIONS.h" |
| 5 |
|
| 6 |
CStartOfInterface |
| 7 |
SUBROUTINE SEAICE_BUDGET_OCEAN( |
| 8 |
I UG, |
| 9 |
U TSURF, |
| 10 |
O netHeatFlux, SWHeatFlux, |
| 11 |
I bi, bj ) |
| 12 |
C /================================================================\ |
| 13 |
C | SUBROUTINE seaice_budget_ocean | |
| 14 |
C | o Calculate surface heat fluxes over open ocean | |
| 15 |
C | see Hibler, MWR, 108, 1943-1973, 1980 | |
| 16 |
C | If SEAICE_EXTERNAL_FLUXES is defined this routine simply | |
| 17 |
C | simply copies the global fields to the seaice-local fields. | |
| 18 |
C |================================================================| |
| 19 |
C \================================================================/ |
| 20 |
IMPLICIT NONE |
| 21 |
|
| 22 |
C === Global variables === |
| 23 |
#include "SIZE.h" |
| 24 |
#include "EEPARAMS.h" |
| 25 |
#include "FFIELDS.h" |
| 26 |
#include "SEAICE_PARAMS.h" |
| 27 |
#include "SEAICE_FFIELDS.h" |
| 28 |
#ifdef SEAICE_VARIABLE_FREEZING_POINT |
| 29 |
#include "DYNVARS.h" |
| 30 |
#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
| 31 |
|
| 32 |
C === Routine arguments === |
| 33 |
C INPUT: |
| 34 |
C UG :: thermal wind of atmosphere |
| 35 |
C TSURF :: surface temperature of ocean in Kelvin |
| 36 |
C bi,bj :: loop indices |
| 37 |
C OUTPUT: |
| 38 |
C netHeatFlux :: net surface heat flux over open water or under ice |
| 39 |
C SWHeatFlux :: short wave heat flux over open water or under ice |
| 40 |
_RL UG (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 41 |
_RL TSURF (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 42 |
_RL netHeatFlux(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 43 |
_RL SWHeatFlux (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 44 |
INTEGER bi, bj |
| 45 |
CEndOfInterface |
| 46 |
|
| 47 |
C === Local variables === |
| 48 |
C i,j - Loop counters |
| 49 |
INTEGER i, j |
| 50 |
#ifndef SEAICE_EXTERNAL_FLUXES |
| 51 |
INTEGER ITER |
| 52 |
_RL QS1, TB, D1, D1W, D3, TMELT |
| 53 |
C effective conductivity of combined ice and snow |
| 54 |
_RL effConduct |
| 55 |
C specific humidity at ice surface |
| 56 |
_RL qhIce |
| 57 |
C powers of temperature |
| 58 |
_RL t1, t2, t3, t4 |
| 59 |
|
| 60 |
C local copies of global variables |
| 61 |
_RL tsurfLoc (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 62 |
_RL atempLoc (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 63 |
_RL lwdownLoc (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 64 |
_RL ALB (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 65 |
C coefficients of Hibler (1980), appendix B |
| 66 |
_RL A1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 67 |
_RL A2 (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 68 |
_RL A3 (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 69 |
C auxiliary variable |
| 70 |
_RL B (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 71 |
|
| 72 |
C NOW DEFINE ASSORTED CONSTANTS |
| 73 |
C SATURATION VAPOR PRESSURE CONSTANT |
| 74 |
QS1=0.622 _d +00/1013.0 _d +00 |
| 75 |
C FREEZING TEMPERATURE OF SEAWATER |
| 76 |
TB=271.2 _d +00 |
| 77 |
C SENSIBLE HEAT CONSTANT |
| 78 |
D1=SEAICE_sensHeat |
| 79 |
C WATER LATENT HEAT CONSTANT |
| 80 |
D1W=SEAICE_latentWater |
| 81 |
C STEFAN BOLTZMAN CONSTANT TIMES 0.97 EMISSIVITY |
| 82 |
D3=SEAICE_emissivity |
| 83 |
C MELTING TEMPERATURE OF ICE |
| 84 |
TMELT=273.16 _d +00 |
| 85 |
|
| 86 |
DO J=1,sNy |
| 87 |
DO I=1,sNx |
| 88 |
netHeatFlux(I,J) = 0. _d 0 |
| 89 |
SWHeatFlux (I,J) = 0. _d 0 |
| 90 |
C |
| 91 |
tsurfLoc (I,J) = MIN(273.16 _d 0+MAX_TICE,TSURF(I,J,bi,bj)) |
| 92 |
C Is this necessary? |
| 93 |
atempLoc (I,J) = MAX(273.16 _d 0+MIN_ATEMP,ATEMP(I,J,bi,bj)) |
| 94 |
lwdownLoc(I,J) = MAX(MIN_LWDOWN,LWDOWN(I,J,bi,bj)) |
| 95 |
ENDDO |
| 96 |
ENDDO |
| 97 |
#endif /* SEAICE_EXTERNAL_FLUXES */ |
| 98 |
|
| 99 |
C NOW DETERMINE OPEN WATER HEAT BUD. ASSUMING TSURF=WATER TEMP. |
| 100 |
C WATER ALBEDO IS ASSUMED TO BE THE CONSTANT SEAICE_waterAlbedo |
| 101 |
DO J=1,sNy |
| 102 |
DO I=1,sNx |
| 103 |
#ifdef SEAICE_EXTERNAL_FLUXES |
| 104 |
netHeatFlux(I,J) = Qnet(I,J,bi,bj) |
| 105 |
SWHeatFlux (I,J) = Qsw(I,J,bi,bj) |
| 106 |
#else /* SEAICE_EXTERNAL_FLUXES undefined */ |
| 107 |
ALB(I,J)=SEAICE_waterAlbedo |
| 108 |
A1(I,J)=(ONE-ALB(I,J))*SWDOWN(I,J,bi,bj) |
| 109 |
& +lwdownLoc(I,J)*0.97 _d 0 |
| 110 |
& +D1*UG(I,J)*atempLoc(I,J)+D1W*UG(I,J)*AQH(I,J,bi,bj) |
| 111 |
B(I,J)=QS1*6.11 _d +00*EXP(17.2694 _d +00 |
| 112 |
& *(tsurfLoc(I,J)-TMELT) |
| 113 |
& /(tsurfLoc(I,J)-TMELT+237.3 _d +00)) |
| 114 |
A2(I,J)=-D1*UG(I,J)*tsurfLoc(I,J)-D1W*UG(I,J)*B(I,J) |
| 115 |
& -D3*(tsurfLoc(I,J)**4) |
| 116 |
netHeatFlux(I,J)=-A1(I,J)-A2(I,J) |
| 117 |
SWHeatFlux (I,J)=-(ONE-ALB(I,J))*SWDOWN(I,J,bi,bj) |
| 118 |
#endif /* SEAICE_EXTERNAL_FLUXES */ |
| 119 |
ENDDO |
| 120 |
ENDDO |
| 121 |
|
| 122 |
RETURN |
| 123 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph