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C $Header: /u/gcmpack/MITgcm/pkg/fizhi/fizhi_rayleigh.F,v 1.8 2005/05/21 23:50:13 molod Exp $ |
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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,pkap,pekap,zsurf,u,v,t,s,im,jm,lm, |
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. bi,bj,rfu,rfv,rft) |
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C ********************************************************************** |
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C |
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C PURPOSE |
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C Rayleigh Friction -- Linear Drag (Strong Damping) Above 70 Km |
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C |
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C ARGUMENTS DESCRIPTION |
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C |
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C INPUT: |
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C MYID .... PROCESS(OR) NUMBER |
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C PRES .... MID-LEVEL PRESSURE IN MB |
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C PKAP .... MID-LEVEL PRESSURE ** KAPPA |
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C PEKAP ... EDGE-LEVEL PRESSURE ** KAPPA |
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C ZSURF ... SURFACE ELEVATION IN M |
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C U ....... U-WIND |
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C V ....... V-WIND |
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C TH ...... THETA (ACTUALLY REAL THETA * P0**KAPPA) IN K |
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C S ...... SPECIFIC HUMIDITY (KG/KG) |
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C IM ...... NUMBER OF LONGITUDE POINTS |
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C JM ...... NUMBER OF LATITUDE POINTS |
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C LM ...... NUMBER OF VERTICAL LEVELS |
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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 OUTPUT: |
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C RFU ..... U-WIND TENDENCY |
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C RFV ..... V-WIND TENDENCY |
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C RFT ..... 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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integer myid,im,jm,lm,bi,bj |
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_RL zsurf(im,jm),pres(im,jm,lm),pkap(im,jm,lm) |
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_RL pekap(im,jm,lm+1) |
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_RL u(im,jm,lm),v(im,jm,lm),t(im,jm,lm),s(im,jm,lm) |
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_RL rfu(im,jm,lm),rfv(im,jm,lm),rft(im,jm,lm) |
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|
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integer i,j,L |
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_RL rf(im,jm,lm) |
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_RL z(im,jm,lm) |
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_RL dz(im,jm,lm) |
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_RL cpog, cpinv, virtcon, getcon, dampcoef |
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#ifdef ALLOW_DIAGNOSTICS |
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logical diagnostics_is_on |
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external diagnostics_is_on |
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_RL tmpdiag(im,jm) |
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#endif |
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|
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C ********************************************************************** |
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C **** APPLY RAYLEIGH FRICTION TO WIND (INCLUDE HEATING) *** |
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C ********************************************************************** |
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|
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cpog = getcon('CP')/getcon('GRAVITY') |
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cpinv = 1.0/getcon('CP') |
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virtcon = getcon('VIRTCON') |
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dampcoef = 2./3. |
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|
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do L=1,lm |
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do j=1,jm |
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do i=1,im |
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dz(i,j,L) = cpog * (pekap(i,j,L+1)-pekap(i,j,L)) * t(i,j,L) * |
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. (1.+virtcon*s(i,j,L)) |
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enddo |
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enddo |
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enddo |
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|
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do j=1,jm |
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do i=1,im |
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z(i,j,lm) = zsurf(i,j) + 0.5 * dz(i,j,lm) |
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enddo |
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enddo |
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|
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do L=lm-1,1,-1 |
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do j=1,jm |
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do i=1,im |
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z(i,j,L) = z(i,j,L+1) + 0.5 * (dz(i,j,L)+dz(i,j,L+1)) |
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enddo |
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enddo |
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enddo |
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|
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do L=1,lm |
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do j=1,jm |
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do i=1,im |
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rf(i,j,L) = dampcoef*(1+tanh((z(i,j,L)-50000.)/5000.))/86400. |
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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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. /pkap(i,j,L) |
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enddo |
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enddo |
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enddo |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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do L=1,lm |
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|
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if(diagnostics_is_on('RFU ',myid) ) then |
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do j=1,jm |
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do i=1,im |
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tmpdiag(i,j) = rfu(i,j,L)*86400 |
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enddo |
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enddo |
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C call diagnostics_fill(tmpdiag,'RFU ',L,1,3,bi,bj,myid) |
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endif |
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|
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if(diagnostics_is_on('RFV ',myid) ) then |
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do j=1,jm |
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do i=1,im |
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tmpdiag(i,j) = rfv(i,j,L)*86400 |
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enddo |
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enddo |
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C call diagnostics_fill(tmpdiag,'RFV ',L,1,3,bi,bj,myid) |
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endif |
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|
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if(diagnostics_is_on('RFT ',myid) ) then |
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do j=1,jm |
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do i=1,im |
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tmpdiag(i,j) = rft(i,j,L)*86400 |
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enddo |
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enddo |
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C call diagnostics_fill(tmpdiag,'RFT ',L,1,3,bi,bj,myid) |
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endif |
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|
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enddo |
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#endif |
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|
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return |
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end |
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