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C $Header: $ |
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C $Name: $ |
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|
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#include "FIZHI_OPTIONS.h" |
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subroutine rayleigh(myid,pres,preskappa,psurf,u,v,im,jm,lm,bi,bj, |
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. rfu,rfv,rft) |
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C ********************************************************************** |
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C |
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C PURPOSE |
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C To implement Rayleigh Friction |
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C |
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C ARGUMENTS DESCRIPTION |
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C MYID .... PROCESS(OR) NUMBER |
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C PRES .... VALUE OF MID-LEVEL PRESSURE |
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C PZ ...... VALUE OF SURFACE PRESSURE - PTOP |
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C UZ ...... VALUE OF U-WIND IN MODEL FOR N-1 TIME STEP |
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C VZ ...... VALUE OF V-WIND IN MODEL FOR N-1 TIME STEP |
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C IM ...... NUMBER OF LONGITUDE POINTS IN MODEL |
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C JM ...... NUMBER OF LATITUDE POINTS IN MODEL |
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C LM ...... NUMBER OF VERTICAL LEVELS IN MODEL |
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C BI ...... X-DIRECTION PROCESSOR INDEX |
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C BJ ...... Y-DIRECTION PROCESSOR INDEX |
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C RFU ..... VALUE OF U-WIND TENDENCY |
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C RFV ..... VALUE OF V-WIND TENDENCY |
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C RFT ..... VALUE OF THETA TENDENCY |
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C |
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C ********************************************************************** |
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|
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implicit none |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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#include "SIZE.h" |
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#include "diagnostics_SIZE.h" |
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#include "diagnostics.h" |
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#endif |
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|
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integer myid,im,jm,lm,bi,bj |
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|
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real psurf(im,jm) |
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real pres(im,jm,lm) |
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real preskappa(im,jm,lm) |
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real u(im,jm,lm) |
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real v(im,jm,lm) |
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real rfu(im,jm,lm) |
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real rfv(im,jm,lm) |
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real rft(im,jm,lm) |
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|
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integer i,j,L |
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real rf(im,jm,lm) |
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real z(im,jm,lm) |
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real z1(im,jm,lm) |
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real z2(im,jm,lm) |
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real cpinv, getcon |
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|
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C ********************************************************************** |
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C **** APPLY RAYLEIGH FRICTION TO WIND TENDENCIES *** |
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C ********************************************************************** |
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|
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cpinv = 1.0/getcon('CP') |
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|
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do L=1,lm |
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|
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do j=1,jm |
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do i=1,im |
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|
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z1(i,j,L) = -7e2*log(pres(i,j,1)/psurf(i,j)) |
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z2(i,j,L) = -7e3*log(pres(i,j,2)/psurf(i,j)) |
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z(i,j,L) = -7e3*log(pres(i,j,L)/psurf(i,j)) |
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rf(i,j,L) = 0.40*(1+tanh((z(i,j,L)-z2(i,j,L))/z1(i,j,L)))/86400 |
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|
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rfu(i,j,L) = - rf(i,j,L) * u(i,j,L) |
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rfv(i,j,L) = - rf(i,j,L) * v(i,j,L) |
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rft(i,j,L) = -(u(i,j,L)*rfu(i,j,L) + v(i,j,L)*rfv(i,j,L) )*cpinv |
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. /preskappa(i,j,L) |
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|
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enddo |
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enddo |
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|
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if( irfu.ne.0 ) then |
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do j=1,jm |
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do i=1,im |
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qdiag(i,j,irfu+L-1,bi,bj) = qdiag(i,j,irfu+L-1,bi,bj) + |
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. rfu(i,j,L)*86400 |
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enddo |
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enddo |
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endif |
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|
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if( irfv.ne.0 ) then |
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do j=1,jm |
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do i=1,im |
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qdiag(i,j,irfv+L-1,bi,bj) = qdiag(i,j,irfv+L-1,bi,bj) + |
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. rfv(i,j,L)*86400 |
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enddo |
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enddo |
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endif |
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|
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if( irft.ne.0 ) then |
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do j=1,jm |
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do i=1,im |
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qdiag(i,j,irft+L-1,bi,bj) = qdiag(i,j,irft+L-1,bi,bj) + |
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. rft(i,j,L)*86400 |
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enddo |
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enddo |
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endif |
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|
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enddo |
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|
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nrfu = nrfu + 1 |
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nrfv = nrfv + 1 |
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nrft = nrft + 1 |
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|
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return |
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end |
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