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C $Header: /u/gcmpack/MITgcm/pkg/fizhi/slprs.F,v 1.3 2006/06/19 23:37:34 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 slprs (PHIS,PLE,THZ,lwmask,im,jm,lm,SLP) |
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C********************************************************************** |
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C INPUT |
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C PHIS .... SURFACE GEOPOTENTIAL (M2/S2) |
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C THZ ..... POTENTIAL TEMPERATURE (K) ON Model LEVELS |
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C grid .... Dynamics Grid Structure |
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C lwmask .. Land:(0.0) Water:(1.0) Mask |
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C |
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C OUTPUT |
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C SLP ..... SEA LEVEL PRESSURE (MB) |
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C |
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C NOTE: Level counting here for thz and ple is top down (thz(1) is top) |
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C*********************************************************************** |
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|
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implicit none |
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|
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integer im,jm,lm |
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_RL SLP (im*jm) |
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_RL PHIS (im*jm), THZ (im*jm,lm) |
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_RL lwmask(im*jm) |
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_RL ple(im*jm,lm+1) |
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|
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_RL TWO, BETA |
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PARAMETER(TWO = 2.0) |
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PARAMETER(BETA = 0.0065) |
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|
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_RL getcon,g,r,ak |
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integer i,L |
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_RL tm (im*jm) |
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integer Ltop (im*jm) |
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|
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G = GETCON('GRAVITY') |
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R = GETCON('RGAS') |
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AK = GETCON('KAPPA') |
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C*********************************************************************** |
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C* COMPUTE MEAN THETA IN PBL (100 MB) * |
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C*********************************************************************** |
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|
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do i=1,im*jm |
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tm(i) = 0.0 |
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Ltop(i) = lm |
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enddo |
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|
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do L = lm,1,-1 |
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do i=1,im*jm |
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if ( ple(i,L+1).ge.(ple(i,lm+1)-100.) ) then |
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Ltop(i) = L |
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tm(i) = tm(i) + thz(i,L)*(ple(i,L+1)-ple(i,L)) |
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endif |
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enddo |
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enddo |
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|
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do i=1,im*jm |
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tm(i) = tm(i)/(ple(i,lm+1)-ple(i,Ltop(i))) |
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enddo |
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|
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C*********************************************************************** |
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C* COMPUTE SEA LEVEL PRESSURE * |
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C*********************************************************************** |
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|
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do i=1,im*jm |
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if( lwmask(i).ne.0.0 ) then |
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TM(I) = TM(I) * (PLE(I,LM+1)/1000.)**AK + BETA*PHIS(I)/(TWO*G) |
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else |
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TM(I) = THZ(I,LM)*(PLE(I,LM+1)/1000.)**AK + BETA*PHIS(I)/(TWO*G) |
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endif |
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|
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SLP(I) = PHIS(I) / ( R*TM(I) ) |
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SLP(I) = PLE(I,LM+1) * EXP( SLP(I) ) |
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enddo |
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|
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RETURN |
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END |
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