/[MITgcm]/MITgcm/model/src/swfrac.F
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Contents of /MITgcm/model/src/swfrac.F

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Revision 1.9 - (show annotations) (download)
Wed Sep 26 18:09:16 2001 UTC (22 years, 7 months ago) by cnh
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint47e_post, checkpoint44e_post, checkpoint46l_post, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint50c_post, checkpoint46f_post, checkpoint48e_post, checkpoint50c_pre, checkpoint44f_post, checkpoint46b_post, checkpoint43a-release1mods, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint48i_post, checkpoint46l_pre, chkpt44d_post, checkpoint51, checkpoint50, release1_p8, release1_p9, checkpoint50d_post, release1_p1, release1_p2, release1_p3, release1_p4, release1_p5, release1_p6, release1_p7, checkpoint50b_pre, checkpoint44e_pre, checkpoint51f_post, release1_b1, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint48b_post, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint47d_pre, release1_chkpt44d_post, checkpoint47a_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, release1_p11, checkpoint47d_post, icebear5, icebear4, icebear3, icebear2, checkpoint46d_pre, checkpoint48d_post, release1-branch_tutorials, checkpoint48f_post, checkpoint45d_post, checkpoint46j_pre, chkpt44a_post, checkpoint44h_pre, checkpoint48h_post, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, ecco_c50_e28, chkpt44c_pre, checkpoint48a_post, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47j_post, ecco_c50_e33a, checkpoint44g_post, branchpoint-genmake2, checkpoint46e_pre, checkpoint48c_post, checkpoint45b_post, checkpoint46b_pre, release1-branch-end, release1_final_v1, checkpoint51b_post, checkpoint51c_post, checkpoint46c_pre, checkpoint46, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint46m_post, checkpoint46a_pre, checkpoint50g_post, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, release1_p12_pre, ecco_c44_e22, checkpoint50h_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, checkpoint46i_post, ecco_c44_e23, ecco_c44_e20, ecco_c44_e21, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, checkpoint46c_post, ecco-branch-mod1, ecco-branch-mod2, ecco-branch-mod3, ecco-branch-mod4, ecco-branch-mod5, checkpoint50d_pre, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint41, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51f_pre, chkpt44c_post, checkpoint48g_post, checkpoint47h_post, checkpoint44f_pre, checkpoint51g_post, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint51a_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_final, release1-branch, branch-genmake2, release1, ecco-branch, release1_50yr, icebear, release1_coupled
Changes since 1.8: +37 -33 lines 
Bringing comments up to data and formatting for document extraction.
1 C $Header: /u/gcmpack/models/MITgcmUV/model/src/swfrac.F,v 1.8 2001/02/04 14:38:48 cnh Exp $
2 C $Name: $
3
4 #include "CPP_OPTIONS.h"
5
6 CBOP
7 C !ROUTINE: SWFRAC
8 C !INTERFACE:
9 SUBROUTINE SWFRAC(
10 I imax, fact,
11 I mytime, mythid,
12 U swdk )
13 C !DESCRIPTION: \bv
14 C *==========================================================*
15 C | SUBROUTINE SWFRAC
16 C | o Compute solar short-wave flux penetration.
17 C *==========================================================*
18 C | Compute fraction of solar short-wave flux penetrating to
19 C | specified depth, swdk, due to exponential decay in
20 C | Jerlov water type jwtype.
21 C | Reference : Two band solar absorption model of Paulson
22 C | and Simpson (1977, JPO, 7, 952-956)
23 C | Notes
24 C | =====
25 C | Parameter jwtype is hardcoded to 3 for time being.
26 C | Below 200m the solar penetration gets set to zero,
27 C | otherwise the limit for the exponent (+/- 5678) needs to
28 C | be taken care of.
29 C | Written by : Jan Morzel
30 C | Date : July 12, 1995
31 C *==========================================================*
32 C \ev
33
34 C !USES:
35 IMPLICIT NONE
36
37 C !INPUT/OUTPUT PARAMETERS:
38 C === Routine arguments ===
39 C input arguments
40 C imax :: number of vertical grid points
41 C fact :: scale factor to apply to depth array
42 C myTime :: current time in simulation
43 C myThid :: thread number for this instance of the routine.
44 INTEGER imax
45 _RL fact
46 _RL mytime
47 integer mythid
48 C input/output arguments
49 C swdk :: on input: vertical depth for desired sw fraction
50 C (fact*swdk) is negative distance (m) from surface
51 C swdk :: on output: short wave (radiation) fractional decay
52 _RL swdk(imax)
53
54 C !LOCAL VARIABLES:
55 C === Local variables ===
56 C max number of different water types
57 integer nwtype , jwtype
58 PARAMETER(nwtype=5)
59 _RL facz
60 _RL rfac(nwtype),a1(nwtype),a2(nwtype)
61 INTEGER i
62 #ifdef ALLOW_CALENDAR
63 _RL fac
64 logical first, changed
65 integer count0, count1
66 integer myiter
67 integer jerl(12)
68 data jerl / 2 , 2 , 2 , 3 , 3 , 3 , 4 , 4 , 4 , 4 , 3 , 2 /
69 #endif /* ALLOW_CALENDAR */
70 C
71 C Jerlov water type : I IA IB II III
72 C jwtype 1 2 3 4 5
73 C
74 DATA rfac / 0.58 , 0.62 , 0.67 , 0.77 , 0.78 /
75 DATA a1 / 0.35 , 0.6 , 1.0 , 1.5 , 1.4 /
76 DATA a2 / 23.0 , 20.0 , 17.0 , 14.0 , 7.9 /
77 CEOP
78
79 #ifdef ALLOW_CALENDAR
80 myiter=0
81 call cal_GetMonthsRec(
82 O fac, first, changed, count0, count1,
83 I mytime, myiter, mythid )
84 jwtype=jerl(count0)
85 #else /* ALLOW_CALENDAR undef */
86 jwtype=2
87 #endif /* ALLOW_CALENDAR */
88
89 DO i = 1,imax
90 facz = fact*swdk(i)
91 IF (facz .LT. (-200.)) THEN
92 swdk(i) = 0.
93 ELSE
94 swdk(i) = rfac(jwtype) * exp(facz/a1(jwtype))
95 $ + (1.-rfac(jwtype)) * exp(facz/a2(jwtype))
96 ENDIF
97 ENDDO
98
99 RETURN
100 END
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