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! $Id: ugeostr.F90 2597 2016-07-22 06:44:47Z emillour $ |
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subroutine ugeostr(phi,ucov) |
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! Calcul du vent covariant geostrophique a partir du champ de |
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! geopotentiel. |
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! We actually compute: (1 - cos^8 \phi) u_g |
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! to have a wind going smoothly to 0 at the equator. |
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! We assume that the surface pressure is uniform so that model |
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! levels are pressure levels. |
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use comconst_mod, only: omeg, rad |
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implicit none |
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include "dimensions.h" |
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include "paramet.h" |
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include "comgeom2.h" |
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real ucov(iip1,jjp1,llm),phi(iip1,jjp1,llm) |
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real um(jjm,llm),fact,u(iip1,jjm,llm) |
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integer i,j,l |
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real zlat |
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um(:,:)=0 ! initialize um() |
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DO j=1,jjm |
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if (abs(sin(rlatv(j))).lt.1.e-4) then |
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zlat=1.e-4 |
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else |
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zlat=rlatv(j) |
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endif |
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fact=cos(zlat) |
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fact=fact*fact |
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fact=fact*fact |
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fact=fact*fact |
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fact=(1.-fact)/ & |
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(2.*omeg*sin(zlat)*(rlatu(j+1)-rlatu(j))) |
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fact=-fact/rad |
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DO l=1,llm |
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DO i=1,iim |
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u(i,j,l)=fact*(phi(i,j+1,l)-phi(i,j,l)) |
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um(j,l)=um(j,l)+u(i,j,l)/REAL(iim) |
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ENDDO |
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ENDDO |
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ENDDO |
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call dump2d(jjm,llm,um,'Vent-u geostrophique') |
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! calcul des champ de vent: |
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DO l=1,llm |
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DO i=1,iip1 |
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ucov(i,1,l)=0. |
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ucov(i,jjp1,l)=0. |
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end DO |
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DO j=2,jjm |
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DO i=1,iim |
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ucov(i,j,l) = 0.5*(u(i,j,l)+u(i,j-1,l))*cu(i,j) |
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end DO |
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ucov(iip1,j,l)=ucov(1,j,l) |
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end DO |
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end DO |
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print *, 301 |
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end subroutine ugeostr |