C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/aim_fields_load.F,v 1.4 2005/04/06 18:35:17 jmc Exp $
C $Name: $
#include "AIM_OPTIONS.h"
CStartOfInterface
SUBROUTINE AIM_FIELDS_LOAD(
I myTime, myIter, myThid )
C *==========================================================*
C | SUBROUTINE AIM_FIELDS_LOAD
C | o Control reading of AIM fields from external source.
C *==========================================================*
C | Loads surface boundary condition datasets for AIM.
C | The routine is called every timetep and periodically
C | loads a set of external fields.
C | Monthly climatology files are read either for
C | a) a direct use (useMMsurfFc):
C | Albedo, Soil moisture, Surface Temperature
C | b) time interpolation (useFMsurfBC):
C | Sea & Land surf. Temp, snow, sea-ice, soil-water (2-lev)
C | + (1rst.iter) ground albedo, vegetation, land-sea fraction
C | Most of the work is done by the master the thread while
C | the other threads spin.
C *==========================================================*
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"
#include "AIM_PARAMS.h"
c #include "AIM_GRID.h"
#include "AIM_FFIELDS.h"
C === Routine arguments ===
C myThid - Thread no. that called this routine.
C myTime - Simulation time
C myIter - Simulation timestep number
INTEGER myThid
_RL myTime
INTEGER myIter
CEndOfInterface
C === Functions ===
#ifdef ALLOW_AIM
C === Local variables ===
C bi,bj, i,j - Loop counters
C tYear - Fraction within year of myTime
C mnthIndex - Current time in whole months
C prevMnthIndex
C fNam - Strings used in constructing file names
C mnthNam
C pfact - used to convert Pot.Temp. to in-situ Temp.
INTEGER bi,bj, i, j
c _RL pfact
INTEGER prevMnthIndex
DATA prevMnthIndex / 0 /
SAVE prevMnthIndex
C-- for use with useMMsurfFc:
_RL tYear, yearLength
INTEGER mnthIndex
CHARACTER*(MAX_LEN_FNAM) fNam
CHARACTER*3 mnthNam(12)
DATA mnthNam /
& 'jan', 'feb', 'mar', 'apr', 'may', 'jun',
& 'jul', 'aug', 'sep', 'oct', 'nov', 'dec' /
SAVE mnthNam
C-- for use with useFMsurfBC:
INTEGER aim_surfForc_NppCycle, nm0, nm1, nm2, nm3
_RL aim_surfForc_TimePeriod, aim_surfForc_TransRatio
_RL t0prd, tNcyc, tmprd, dTprd
IF (aim_useMMsurfFc) THEN
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
C-- Use Monthly Mean surface forcing fields:
C- Calculate offset into a year
c tYear = myTime/(86400.*360.) -
c & FLOAT(INT(myTime/(86400.*360.)))
yearLength = 86400.*360.
tYear = MOD(myTime/yearLength, 1. _d 0)
mnthIndex = INT(tYear*12.)+1
IF ( mnthIndex .NE. prevMnthIndex .OR.
& myIter.EQ.nIter0 ) THEN
C- New month so load in data
C Prevent loading of new data before everyone has finished with it
CALL BAR2(myThid)
C Master thread coordinates loading of AIM datasets
_BEGIN_MASTER( myThid )
prevMnthIndex = mnthIndex
C o Albedo ( convert % to fraction )
WRITE(fNam,'(A,A,A)' ) 'salb.',
& mnthNam(mnthIndex), aim_MMsufx(1:aim_MMsufxLength)
CALL MDSREADFIELD(fNam,readBinaryPrec,'RS',1,
O aim_albedo,
I 1,myThid)
C o Surface temperature ( in kelvin )
IF (aim_surfPotTemp) THEN
WRITE(fNam,'(A,A,A)' ) 'stheta.',
& mnthNam(mnthIndex), aim_MMsufx(1:aim_MMsufxLength)
ELSE
WRITE(fNam,'(A,A,A)' ) 'sTemp.',
& mnthNam(mnthIndex), aim_MMsufx(1:aim_MMsufxLength)
ENDIF
CALL MDSREADFIELD(fNam,readBinaryPrec,'RS',1,
O aim_surftemp,
I 1,myThid)
C o Soil moisture
WRITE(fNam,'(A,A,A)' ) 'smoist.',
& mnthNam(mnthIndex), aim_MMsufx(1:aim_MMsufxLength)
CALL MDSREADFIELD(fNam,readBinaryPrec,'RS',1,
O aim_soilWater,
I 1,myThid)
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
C-- Converts fields for direct use in Atmos. Physics routine.
C better here rather than in "aim_do_atmos" since:
C a) change together conversion factor and input file name.
C b) conversion applied only 1 time / month ;
C c) easy to check here (variable in common).
DO bj=1,nSy
DO bi=1,nSx
C- Converts surface albedo : input data is in % 0-100
C and Franco s package needs a fraction between 0-1
DO j=1,sNy
DO i=1,sNx
aim_albedo(I,J,bi,bj) = aim_albedo(I,J,bi,bj)/100.
ENDDO
ENDDO
C- Converts soil moisture (case input is in cm in bucket of depth 20cm.)
c DO j=1,sNy
c DO i=1,sNx
c aim_soilWater(I,J,bi,bj) = aim_soilWater(I,J,bi,bj)
c & /20.
c ENDDO
c ENDDO
C-- Correct for truncation (because of hFacMin) of surface reference
C pressure Ro_surf that affects Surf.Temp. :
DO j=1,sNy
DO i=1,sNx
c pfact = (Ro_surf(i,j,bi,bj)/atm_Po)**atm_kappa
aim_surftemp(i,j,bi,bj) = aim_surftemp(i,j,bi,bj)
& * truncSurfP(i,j,bi,bj)
ENDDO
ENDDO
C-- end bi,bj loops
ENDDO
ENDDO
IF (myIter.EQ.nIter0)
& CALL WRITE_FLD_XY_RL('aim_Tsurf',' ',aim_surfTemp,0,myThid)
_END_MASTER( myThid )
C Stop anyone leaving until all data is read
CALL BAR2(myThid)
C- endif New month - load in data
ENDIF
ELSEIF (aim_useFMsurfBC) THEN
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
C-- Use Franco Molteni surface BC:
C take part of S/R INFORC + part of S/R FORDATE (albedo)
C of the F.Molteni SPEEDY code (ver23)
IF ( myIter.EQ.nIter0 ) THEN
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-Oly,sNy+Oly
DO i=1-Olx,sNx+Olx
c aim_landFr(i,j,bi,bj)= 0.
aim_albedo(i,j,bi,bj)= 0.
aim_veget(i,j,bi,bj) = 0.
aim_sst0(i,j,bi,bj) =300.
aim_lst0(i,j,bi,bj) =300.
aim_oic0(i,j,bi,bj) = 0.
aim_snw0(i,j,bi,bj) = 0.
aim_sw10(i,j,bi,bj) = 0.
aim_sw20(i,j,bi,bj) = 0.
aim_sst1(i,j,bi,bj) =300.
aim_lst1(i,j,bi,bj) =300.
aim_oic1(i,j,bi,bj) = 0.
aim_snw1(i,j,bi,bj) = 0.
aim_sw11(i,j,bi,bj) = 0.
aim_sw21(i,j,bi,bj) = 0.
ENDDO
ENDDO
ENDDO
ENDDO
ENDIF
C- Length (s) of one time period:
aim_surfForc_TimePeriod = 30.*86400.
C- Number of time period per Cycle:
aim_surfForc_NppCycle = 12
C- define how fast the (linear) transition is from one month to the next
C = 1 -> linear between 2 midle month
C > TimePeriod/deltaT -> jump from one month to the next one
aim_surfForc_TransRatio = 1.
t0prd = myTime / aim_surfForc_TimePeriod
tNcyc = aim_surfForc_NppCycle
tmprd = t0prd - 0.5 _d 0 + tNcyc
tmprd = MOD(tmprd,tNcyc)
C- indices of previous month and next month:
nm0 = 1 + INT(tmprd)
nm1 = 1 + MOD(nm0,aim_surfForc_NppCycle)
C- interpolation weight:
dTprd = tmprd - (nm0 - 1)
aim_sWght1 = 0.5 _d 0+(dTprd-0.5 _d 0)*aim_surfForc_TransRatio
aim_sWght1 = MAX( 0. _d 0, MIN(1. _d 0, aim_sWght1) )
aim_sWght0 = 1. _d 0 - aim_sWght1
IF (myIter.EQ.nIter0 .OR. nm0.NE.prevMnthIndex) THEN
C- Load new data:
C Prevent loading of new data before everyone has finished with it
CALL BAR2(myThid)
C Master thread coordinates loading of AIM datasets
_BEGIN_MASTER( myThid )
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
prevMnthIndex = nm0
IF ( myIter.EQ.nIter0 ) THEN
C-- Load Fixed Forcing only at the 1rst iter:
c IF ( aim_LandFile .NE. ' ' ) THEN
c CALL READ_REC_XY_RS(aim_LandFile,aim_landFr,1,myIter,myThid)
c ENDIF
IF ( aim_albFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_albFile,aim_albedo, 1,myIter,myThid)
ENDIF
c alb0(i,j) = 0.01*r4inp(i,j)
IF ( aim_vegFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_vegFile,aim_veget,1,myIter,myThid)
ENDIF
DO bj=1,nSy
DO bi=1,nSx
C- Converts surface albedo : from % (input data) to a fraction [0-1}
c alb0(i,j) = 0.01*r4inp(i,j)
DO j=1,sNy
DO i=1,sNx
aim_albedo(i,j,bi,bj) = aim_albedo(I,J,bi,bj)/100. _d 0
ENDDO
ENDDO
C- Converts vegetation fraction: from % (input data) to a fraction [0-1]
c veg(i,j)=max(0.,0.01*veg(i,j))
DO j=1,sNy
DO i=1,sNx
aim_veget(i,j,bi,bj) =
& MAX(0. _d 0, aim_veget(i,j,bi,bj)/100. _d 0)
ENDDO
ENDDO
ENDDO
ENDDO
C-- endif 1rst iter.
ENDIF
IF ( aim_sstFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_sstFile,aim_sst0,nm0,myIter,myThid)
CALL READ_REC_XY_RS(aim_sstFile,aim_sst1,nm1,myIter,myThid)
ENDIF
IF ( aim_lstFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_lstFile,aim_lst0,nm0,myIter,myThid)
CALL READ_REC_XY_RS(aim_lstFile,aim_lst1,nm1,myIter,myThid)
ENDIF
IF ( aim_oiceFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_oiceFile,aim_oic0,nm0,myIter,myThid)
CALL READ_REC_XY_RS(aim_oiceFile,aim_oic1,nm1,myIter,myThid)
ENDIF
IF ( aim_snowFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_snowFile,aim_snw0,nm0,myIter,myThid)
CALL READ_REC_XY_RS(aim_snowFile,aim_snw1,nm1,myIter,myThid)
ENDIF
IF ( aim_swcFile .NE. ' ' ) THEN
CALL READ_REC_XY_RS(aim_swcFile,aim_sw10,nm0,myIter,myThid)
CALL READ_REC_XY_RS(aim_swcFile,aim_sw11,nm1,myIter,myThid)
nm2 = nm0 + aim_surfForc_NppCycle
nm3 = nm1 + aim_surfForc_NppCycle
CALL READ_REC_XY_RS(aim_swcFile,aim_sw20,nm2,myIter,myThid)
CALL READ_REC_XY_RS(aim_swcFile,aim_sw21,nm3,myIter,myThid)
ENDIF
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
_END_MASTER( myThid )
C Stop anyone leaving until all data is read
CALL BAR2(myThid)
C-- Correct for truncation (because of hFacMin) of surface reference
C pressure Ro_surf that affects Surf.Temp. :
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
c pfact = (Ro_surf(i,j,bi,bj)/atm_Po)**atm_kappa
aim_lst0(i,j,bi,bj) = aim_lst0(i,j,bi,bj)
& * truncSurfP(i,j,bi,bj)
aim_lst1(i,j,bi,bj) = aim_lst1(i,j,bi,bj)
& * truncSurfP(i,j,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
C- endif load new data.
ENDIF
ENDIF
#endif /* ALLOW_AIM */
RETURN
END