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C $Header: /u/gcmpack/MITgcm/pkg/ebm/ebm_wind_perturb.F,v 1.1 2004/05/14 21:10:34 heimbach Exp $ |
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heimbach |
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C $Name: $ |
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#include "EBM_OPTIONS.h" |
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CStartOfInterface |
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SUBROUTINE EBM_WIND_PERTURB( myTime, myIter, myThid ) |
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C |==========================================================| |
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C | S/R EBM_WIND_PERTURB | |
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C | o Calculated random wind perturbations. | |
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C |==========================================================| |
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IMPLICIT NONE |
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C == Global data == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "DYNVARS.h" |
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#include "FFIELDS.h" |
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#ifdef ALLOW_EBM |
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# include "EBM.h" |
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#endif |
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C == Routine arguments == |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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CEndOfInterface |
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#ifdef ALLOW_EBM |
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# ifdef EBM_WIND_PERT |
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C == Local variables == |
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C Loop counters |
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INTEGER i, j, bi, bj |
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_RS ya(1-OLy:sNy+OLy), ya2(1-OLy:sNy+OLy) |
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_RS xa(1-OLx:sNx+OLx), xa2(1-OLx:sNx+OLx) |
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_RS y(1-OLy:sNy+OLy), x(1-OLx:sNx+OLx) |
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_RS temp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS temp2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS stdev(1-OLy:sNy+OLy) |
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_RS std(1:40) |
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data std /0.030, 0.035, 0.045, 0.053, 0.059, 0.060, 0.056, |
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& 0.048, 0.041, 0.038, 0.034, 0.029, 0.023, 0.018, |
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& 0.016, 0.015, 0.013, 0.011, 0.008, 0.005, 0.005, |
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& 0.005, 0.008, 0.011, 0.014, 0.014, 0.017, 0.019, |
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& 0.023, 0.029, 0.032, 0.038, 0.048, 0.058, 0.065, |
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& 0.067, 0.063, 0.060, 0.062, 0.064 / |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j = 1-OLy, sNy+OLy |
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y(j) = 0.0 |
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ya(j) = 0.0 |
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ya2(j) = 0.0 |
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stdev(j) = 0.0 |
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ENDDO |
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DO i = 1-OLx, sNx+OLx |
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x(i) = 0.0 |
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xa(i) = 0.0 |
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xa2(i) = 0.0 |
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ENDDO |
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DO i = 1-OLx, sNx+OLx |
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DO j = 1-OLy, sNy+OLy |
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temp(i,j) = 0.0 |
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temp2(i,j) = 0.0 |
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ENDDO |
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ENDDO |
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DO j = 1, sNy |
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stdev(j) = std(j) |
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ENDDO |
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cph Generate random numbers |
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cph Need to get this from somewhere! |
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call random_number (temp) |
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C interpolation in first dimension |
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C scaling to get a process with a standard deviation of 1 |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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temp(i,j) = 1.73*(2.0*temp(i,j) - 1.0) |
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ENDDO |
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ENDDO |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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x(i) = i |
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xa(i) = x(i) - MOD(x(i),10.0) |
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xa2(i) = xa(i)+10.0 |
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if ( xa2(i) .gt. sNx+Olx ) then |
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xa2(i) = 0.0 |
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endif |
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temp2(i,j) = 0.1*( (x(i)-xa(i))*temp(INT(xa2(i)),j)+ |
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& (10.0-x(i)+xa(i))*temp(INT(xa(i)),j) ) |
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ENDDO |
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ENDDO |
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C interpolation in second dimension |
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C multiplication with observation zonal wind stress standard deviation |
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C add AR1 process |
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DO i = iMin, iMax |
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DO j = jMin, jMax |
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y(j) = j |
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ya(j) = y(j) - MOD(y(j),6.0) |
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ya2(j) = ya(j)+6.0 |
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if ( ya2(j) .gt. sNy+Oly ) then |
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ya2(j) = 0.0 |
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endif |
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c time lag correlation coefficient, use 0.75 for temperature timescale, |
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c 0.98 for the momentum timescale. |
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winPert(i,j,bi,bj) = maskW(i,j,k,bi,bj)* |
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& (1.0/1.66)*(0.75*winPert(i,j,bi,bj) + |
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& stdev(j)*(1.0/6.0)* |
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& ((y(j)-ya(j))*temp2(i,INT(ya2(j)))+ |
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& (6.0-y(j)+ya(j))*temp2(i,INT(ya(j))))) |
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heimbach |
1.2 |
ENDDO |
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ENDDO |
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heimbach |
1.1 |
ENDDO |
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ENDDO |
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C CALL PLOT_FIELD_XYRS( winPert, 'winPert',1,myThid) |
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_EXCH_XY_R4(winPert , myThid ) |
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# endif /* EBM_WIND_PERT */ |
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#endif /* ALLOW_EBM */ |
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end |
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