/[MITgcm]/MITgcm/pkg/aim_v23/phy_snow_precip.F
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Revision 1.1 - (hide annotations) (download)
Thu Mar 11 14:33:19 2004 UTC (20 years, 2 months ago) by jmc
Branch: MAIN
CVS Tags: checkpoint64y, checkpoint64x, checkpoint58l_post, checkpoint64z, checkpoint57t_post, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint64j, checkpoint64m, checkpoint64l, checkpoint64o, checkpoint64n, checkpoint64a, checkpoint57o_post, checkpoint64c, checkpoint64b, checkpoint64e, checkpoint64d, checkpoint64g, checkpoint64f, checkpoint58e_post, checkpoint57v_post, checkpoint52n_post, checkpoint53d_post, checkpoint58u_post, checkpoint58w_post, checkpoint54a_pre, checkpoint57m_post, checkpoint55c_post, checkpoint54e_post, checkpoint57s_post, checkpoint54a_post, checkpoint63p, checkpoint63q, checkpoint63r, checkpoint63s, checkpoint63l, checkpoint63m, checkpoint63n, checkpoint63o, checkpoint63h, checkpoint63i, checkpoint63j, checkpoint63k, checkpoint63d, checkpoint63e, checkpoint63f, checkpoint63g, checkpoint53c_post, checkpoint63a, checkpoint63b, checkpoint63c, checkpoint57k_post, checkpoint55d_pre, checkpoint57d_post, checkpoint57g_post, checkpoint64, checkpoint65, checkpoint60, checkpoint61, checkpoint62, checkpoint63, checkpoint57b_post, checkpoint57c_pre, checkpoint58r_post, checkpoint55j_post, checkpoint56b_post, checkpoint57i_post, checkpoint57y_post, checkpoint57e_post, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, checkpoint52l_post, checkpoint55h_post, checkpoint58n_post, checkpoint58x_post, checkpoint57g_pre, checkpoint54b_post, checkpoint53b_pre, checkpoint55b_post, checkpoint58t_post, checkpoint58h_post, checkpoint65z, checkpoint65x, checkpoint65y, checkpoint54d_post, checkpoint65r, checkpoint65s, checkpoint65p, checkpoint65q, checkpoint65v, checkpoint65w, checkpoint65t, checkpoint65u, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65o, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, checkpoint56c_post, checkpoint52m_post, checkpoint57y_pre, checkpoint55, checkpoint53a_post, checkpoint57f_pre, checkpoint57a_post, checkpoint54, checkpoint58q_post, checkpoint54f_post, checkpoint53b_post, checkpoint59q, checkpoint59p, checkpoint55g_post, checkpoint59r, checkpoint58j_post, checkpoint59e, checkpoint59d, checkpoint59g, checkpoint59f, checkpoint59a, checkpoint55f_post, checkpoint59c, checkpoint59b, checkpoint59m, checkpoint59l, checkpoint59o, checkpoint59n, checkpoint59i, checkpoint59h, checkpoint59k, checkpoint59j, checkpoint57r_post, checkpoint59, checkpoint58, checkpoint57a_pre, checkpoint55i_post, checkpoint57, checkpoint56, checkpoint53, eckpoint57e_pre, checkpoint57h_done, checkpoint58f_post, checkpoint53g_post, checkpoint57x_post, checkpoint57n_post, checkpoint58d_post, checkpoint58c_post, checkpoint57w_post, checkpoint57p_post, checkpint57u_post, checkpoint57f_post, checkpoint58a_post, checkpoint58i_post, checkpoint57q_post, checkpoint58g_post, checkpoint58o_post, checkpoint57z_post, checkpoint62c, checkpoint62b, checkpoint62a, checkpoint62g, checkpoint62f, checkpoint62e, checkpoint62d, checkpoint62k, checkpoint62j, checkpoint62i, checkpoint62h, checkpoint62o, checkpoint62n, checkpoint62m, checkpoint62l, checkpoint62s, checkpoint62r, checkpoint62q, checkpoint62p, checkpoint62w, checkpoint62v, checkpoint62u, checkpoint62t, checkpoint57c_post, checkpoint62z, checkpoint62y, checkpoint62x, checkpoint58y_post, checkpoint55e_post, checkpoint58k_post, checkpoint58v_post, checkpoint53f_post, checkpoint55a_post, checkpoint53d_pre, checkpoint54c_post, checkpoint58s_post, checkpoint61f, checkpoint61g, checkpoint61d, checkpoint61e, checkpoint61b, checkpoint61c, checkpoint58p_post, checkpoint61a, checkpoint61n, checkpoint61o, checkpoint61l, checkpoint61m, checkpoint61j, checkpoint61k, checkpoint61h, checkpoint61i, checkpoint61v, checkpoint61w, checkpoint61t, checkpoint61u, checkpoint61r, checkpoint61s, checkpoint61p, checkpoint61q, checkpoint57j_post, checkpoint61z, checkpoint61x, checkpoint61y, checkpoint58b_post, checkpoint57h_pre, checkpoint58m_post, checkpoint57l_post, checkpoint57h_post, checkpoint56a_post, checkpoint55d_post, HEAD 
a) Treat separately land / ocean / sea-ice surface fluxes
   to allow implicit computation of land & sea-ice surface temp.
b) add snow precipitation
c) other (little) modifications for new land formulation.
1 jmc 1.1 C $Header: $
2     C $Name: $
3    
4     #include "AIM_OPTIONS.h"
5    
6     CBOP
7     C !ROUTINE: SNOW_PRECIP
8     C !INTERFACE:
9     SUBROUTINE SNOW_PRECIP (
10     I PSA, dpFac, ThA,
11     I IDEPTH,PRECNV,DQCNV,PRECLS,DQLSC,
12     U DTCNV,DTLSC,
13     O EnPrec,
14     I kGrd,bi,bj,myThid)
15    
16     C !DESCRIPTION: \bv
17     C *==========================================================*
18     C | S/R SNOW_PRECIP
19     C | o Diagnose snow precipitation according to near surface
20     C | air temperature.
21     C *==========================================================*
22     C | Correct condensation heating for energy (rain Temp, snow)
23     C | of precipication (L.S. cond & convect. precip)
24     C *==========================================================*
25     C \ev
26    
27     C !USES:
28     IMPLICIT NONE
29    
30     C == Global variables ===
31    
32     C Resolution parameters
33     C-- size for MITgcm & Physics package :
34     #include "AIM_SIZE.h"
35     #include "EEPARAMS.h"
36    
37     C Physical constants + functions of sigma and latitude
38     #include "com_physcon.h"
39    
40     C == Routine Arguments ==
41     C !INPUT PARAMETERS:
42     C kGrd :: Ground level index (2-dim)
43     C bi,bj :: tile index
44     C myThid :: Thread number for this instance of the routine
45     C PSA :: norm. surface pressure [p/p0] (2-dim)
46     C dpFac :: cell delta_P fraction (3-dim)
47     C ThA :: Pot.temperature [K] (3-dim)
48     C IDEPTH :: convection depth in layers (2-dim)
49     C PRECNV :: convective precipitation [g/(m^2 s)] (2-dim)
50     C DQCNV :: hum. tendency [g/(kg s)] from convection (3-dim)
51     C PRECLS :: large-scale precipitation [g/(m^2 s)] (2-dim)
52     C DQLSC :: hum. tendency [g/(kg s)] from l.s. cond (3-dim)
53     C !MODIFIED PARAMETERS:
54     C DTCNV :: temperature tendency from convection (3-dim)
55     C DTLSC :: temperature tendency from l.s. cond (3-dim)
56     C !OUTPUT PARAMETERS:
57     C EnPrec :: energy of precipitation (snow, rain temp) [J/g]
58     C--
59     _RL PSA(NGP), dpFac(NGP,NLEV), ThA(NGP,NLEV)
60     _RL PRECLS(NGP), DTLSC(NGP,NLEV), DQLSC(NGP,NLEV)
61     _RL PRECNV(NGP), DTCNV(NGP,NLEV), DQCNV(NGP,NLEV)
62     _RL EnPrec(NGP)
63     INTEGER IDEPTH(NGP)
64     INTEGER kGrd(NGP)
65     INTEGER bi,bj,myThid
66     CEOP
67    
68     #ifdef ALLOW_AIM
69    
70     C-- Local variables:
71     INTEGER J, K, Ktop
72     _RL kappa
73     _RL T1(NGP)
74    
75     C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
76    
77     C-- 1. Initialization
78     kappa = RD/CP
79    
80     C-- 2. Compute energy of precip, based on near-surface Air temperature:
81     C note: EnPrec units are J/g since precip is in g/m2 and spec.hum. in g/Kg
82     DO J=1,NGP
83     IF ( kGrd(J).NE.0 ) THEN
84     T1(J) = ThA(J,kGrd(J))*(PSA(J)**kappa)
85     IF ( T1(J) .GE. tFreeze ) THEN
86     EnPrec(J) = rainCP*(T1(J)-tFreeze)
87     ELSE
88     EnPrec(J) = -ALHF
89     ENDIF
90     ELSE
91     EnPrec(J) = 0.
92     ENDIF
93     ENDDO
94    
95     C-- 3. Large-scale precipitation: correct condensation Heating
96    
97     DO J=1,NGP
98     DO K=2,kGrd(J)
99     DTLSC(J,K) = DTLSC(J,K) + EnPrec(J)*DQLSC(J,K)/CP
100     ENDDO
101     ENDDO
102    
103     C-- 4. Convective precipitation: correct condensation Heating
104    
105     DO J=1,NGP
106     IF (kGrd(J).NE.0 .AND. IDEPTH(J).NE.0 ) THEN
107     Ktop = kGrd(J) - IDEPTH(J)
108     DTCNV(J,Ktop) = DTCNV(J,Ktop)
109     & - EnPrec(J)*PRECNV(J)*GRDSCP(Ktop)
110     ENDIF
111     ENDDO
112    
113     #endif /* ALLOW_AIM */
114    
115     RETURN
116     END
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