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c $Header: /u/u3/gcmpack/MITgcm/pkg/exf/exf_getforcing.F,v 1.7.2.1 2003/10/02 18:30:07 adcroft Exp $ |
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#include "EXF_OPTIONS.h" |
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CBOI |
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C |
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C !TITLE: EXTERNAL FORCING |
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C !AUTHORS: mitgcm developers ( support@mitgcm.org ) |
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C !AFFILIATION: Massachussetts Institute of Technology |
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C !DATE: |
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C !INTRODUCTION: External forcing package |
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c \bv |
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c * The external forcing package, in conjunction with the |
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c calendar package, enables the handling of realistic forcing |
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c fields of differing temporal forcing patterns. |
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c * It comprises climatological restoring and relaxation |
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c * Bulk formulae are implemented to convert atmospheric fields |
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c to surface fluxes. |
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c |
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C !CALLING SEQUENCE: |
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c ... |
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c exf_getforcing |
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c | |
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c |-- exf_getclim (get climatological fields used e.g. for relax.) |
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c | |
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c |-- exf_getffields <- this one does almost everything |
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c | | 1. reads in fields, either flux or atmos. state, |
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c | | depending on CPP options |
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c | | 2. If forcing and control is flux, we're already done here |
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c | | 3. If forcing is atmos. state, then |
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c | | (a) if control is atmos. state, then the control variable |
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c | | anomalies are read here |
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c | | * ctrl_getatemp |
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c | | * ctrl_getaqh |
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c | | * ctrl_getuwind |
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c | | * ctrl_getvwind |
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c | | 4. flux fields are interpolated on current time |
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c | | (b) next the flux fields are computed via bulk formulae |
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c | | |
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c | |-- exf_obcs |
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c | If open boundaries are prescribed externally, |
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c | OB values for current time step are read here |
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c | 1. for each boundary (north, south, west, east) |
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c | sliced fields are read for T,S,U,V |
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c | 2. if OB's are part of control vector, |
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c | control variable anomalies are added to OB values |
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c | * ctrl_getobcsn |
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c | * ctrl_getobcss |
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c | * ctrl_getobcsw |
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c | * ctrl_getobcse |
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c | |
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c |-- exf_bulkformulae |
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c | If ALLOW_BULKFORMULAE, compute fluxes via bulkformulae |
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c | |
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c |-- exf_getsurfacefluxes |
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c | If forcing and control is flux, then the |
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c | control vector anomalies are read here |
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c | * ctrl_getheatflux |
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c | * ctrl_getsaltflux |
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c | * ctrl_getzonstress |
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c | * call ctrl_getmerstress |
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c | |
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c |-- exf_mapfields |
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c | Forcing fields from exf package are mapped onto |
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c | mitgcm forcing arrays. |
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c | Mapping enables a runtime rescaling of fields |
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c |
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c \ev |
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CEOI |
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|
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CBOP |
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C !ROUTINE: exf_getforcing |
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C !INTERFACE: |
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subroutine exf_getforcing( mytime, myiter, mythid ) |
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|
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C !DESCRIPTION: \bv |
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c *================================================================= |
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c | SUBROUTINE exf_getforcing |
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c *================================================================= |
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c o Get the forcing fields for the current time step. The switches |
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c for the inclusion of the individual forcing components have to |
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c be set in EXF_OPTIONS.h (or ECCO_CPPOPTIONS.h). |
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c A note on surface fluxes: |
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c The MITgcmUV's vertical coordinate z is positive upward. |
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c This implies that a positive flux is out of the ocean |
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c model. However, the wind stress forcing is not treated |
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c this way. A positive zonal wind stress accelerates the |
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c model ocean towards the east. |
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c started: eckert@mit.edu, heimbach@mit.edu, ralf@ocean.mit.edu |
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c mods for pkg/seaice: menemenlis@jpl.nasa.gov 20-Dec-2002 |
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c *================================================================= |
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c | SUBROUTINE exf_getforcing |
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c *================================================================= |
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C \ev |
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|
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C !USES: |
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implicit none |
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|
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#include "EEPARAMS.h" |
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#include "SIZE.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "exf_param.h" |
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#include "exf_fields.h" |
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#include "exf_constants.h" |
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|
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c == global variables == |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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c == routine arguments == |
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integer mythid |
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integer myiter |
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_RL mytime |
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|
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C !LOCAL VARIABLES: |
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c == local variables == |
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|
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integer bi,bj |
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integer i,j,k |
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c == end of interface == |
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CEOP |
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c Get values of climatological fields. |
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call exf_getclim( mytime, myiter, mythid ) |
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c Get the surface forcing fields. |
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call exf_getffields( mytime, myiter, mythid ) |
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c Compute bulk formulae |
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#ifdef ALLOW_BULKFORMULAE |
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call exf_bulkformulae( mytime, myiter, mythid ) |
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#endif |
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|
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c Apply runoff, masks and exchanges |
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do bj = mybylo(mythid),mybyhi(mythid) |
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do bi = mybxlo(mythid),mybxhi(mythid) |
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k = 1 |
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do j = 1,sny |
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do i = 1,snx |
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#ifdef ALLOW_RUNOFF |
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sflux(i,j,bi,bj) = sflux(i,j,bi,bj) - runoff(i,j,bi,bj) |
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#endif |
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hflux(i,j,bi,bj) = hflux(i,j,bi,bj)*maskc(i,j,1,bi,bj) |
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sflux(i,j,bi,bj) = sflux(i,j,bi,bj)*maskc(i,j,1,bi,bj) |
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enddo |
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enddo |
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enddo |
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enddo |
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|
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c Update the tile edges. |
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_EXCH_XY_R8(hflux, mythid) |
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_EXCH_XY_R8(sflux, mythid) |
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CALL EXCH_UV_XY_RL(ustress, vstress, .TRUE., myThid) |
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#ifdef SHORTWAVE_HEATING |
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_EXCH_XY_R8(swflux, mythid) |
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#endif |
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#ifdef ATMOSPHERIC_LOADING |
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_EXCH_XY_R8(apressure, mythid) |
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#endif |
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c Get values of the surface flux anomalies. |
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call exf_getsurfacefluxes( mytime, myiter, mythid ) |
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c Map the forcing fields onto the corresponding model fields. |
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call exf_mapfields( mythid ) |
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|
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end |
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