1 |
C $Header: /u/gcmpack/MITgcm/pkg/fizhi/slprs.F,v 1.1 2006/05/18 19:38:32 molod Exp $ |
2 |
C $Name: $ |
3 |
|
4 |
#include "FIZHI_OPTIONS.h" |
5 |
subroutine slprs (PHIS,PLE,THZ,lwmask,im,jm,lm,SLP) |
6 |
C*********************************************************************** |
7 |
C INPUT |
8 |
C PHIS .... SURFACE GEOPOTENTIAL (M2/S2) |
9 |
C THZ ..... POTENTIAL TEMPERATURE (K) ON Model LEVELS |
10 |
C grid .... Dynamics Grid Structure |
11 |
C lwmask .. Land:(0.0) Water:(1.0) Mask |
12 |
C |
13 |
C OUTPUT |
14 |
C SLP ..... SEA LEVEL PRESSURE (MB) |
15 |
C |
16 |
C NOTE: Level counting here for thz and ple is top down (thz(1) is top) |
17 |
C*********************************************************************** |
18 |
|
19 |
implicit none |
20 |
|
21 |
integer im,jm,lm |
22 |
_RL SLP (im*jm) |
23 |
_RL PHIS (im*jm), THZ (im*jm,lm) |
24 |
_RL lwmask(im*jm) |
25 |
_RL ple(im*jm,lm+1) |
26 |
|
27 |
_RL TWO, BETA |
28 |
PARAMETER(TWO = 2.0) |
29 |
PARAMETER(BETA = 0.0065) |
30 |
|
31 |
_RL getcon,g,r,ak |
32 |
integer i,L |
33 |
_RL tm (im*jm) |
34 |
integer Ltop (im*jm) |
35 |
|
36 |
G = GETCON('GRAVITY') |
37 |
R = GETCON('RGAS') |
38 |
AK = GETCON('KAPPA') |
39 |
C*********************************************************************** |
40 |
C* COMPUTE MEAN THETA IN PBL (100 MB) * |
41 |
C*********************************************************************** |
42 |
|
43 |
do i=1,im*jm |
44 |
tm(i) = 0.0 |
45 |
Ltop(i) = lm |
46 |
enddo |
47 |
|
48 |
do L = lm,1,-1 |
49 |
do i=1,im*jm |
50 |
if ( ple(i,L+1).ge.(ple(i,lm+1)-100.) ) then |
51 |
Ltop(i) = L |
52 |
tm(i) = tm(i) + thz(i,L)*(ple(i,L+1)-ple(i,L)) |
53 |
endif |
54 |
enddo |
55 |
enddo |
56 |
|
57 |
do i=1,im*jm |
58 |
tm(i) = tm(i)/(ple(i,lm+1)-ple(i,Ltop(i))) |
59 |
enddo |
60 |
|
61 |
C*********************************************************************** |
62 |
C* COMPUTE SEA LEVEL PRESSURE * |
63 |
C*********************************************************************** |
64 |
|
65 |
do i=1,im*jm |
66 |
if( lwmask(i).eq.0.0 ) then |
67 |
TM(I) = TM(I) * (PLE(I,LM+1)/1000.)**AK + BETA*PHIS(I)/(TWO*G) |
68 |
else |
69 |
TM(I) = THZ(I,LM)*(PLE(I,LM+1)/1000.)**AK + BETA*PHIS(I)/(TWO*G) |
70 |
endif |
71 |
|
72 |
SLP(I) = PHIS(I) / ( R*TM(I) ) |
73 |
SLP(I) = PLE(I,LM+1) * EXP( SLP(I) ) |
74 |
enddo |
75 |
|
76 |
RETURN |
77 |
END |