| 1 |
adcroft |
1.1 |
C $Header: /u/gcmpack/models/MITgcmUV/model/src/ini_forcing.F,v 1.15 1998/12/15 00:20:34 adcroft Exp |
| 2 |
|
|
|
| 3 |
|
|
#include "CPP_OPTIONS.h" |
| 4 |
|
|
|
| 5 |
|
|
C I.Fukumori 8/24/98 |
| 6 |
|
|
CStartOfInterface |
| 7 |
|
|
SUBROUTINE SWFRAC( |
| 8 |
|
|
I imax, fact, z, jwtype, |
| 9 |
|
|
O swdk ) |
| 10 |
|
|
C /==========================================================\ |
| 11 |
|
|
C | SUBROUTINE SWFRAC | |
| 12 |
|
|
C | Compute fraction of solar short-wave flux penetrating to | |
| 13 |
|
|
C | specified depth, z, due to exponential decay in | |
| 14 |
|
|
C | Jerlov water type jwtype. | |
| 15 |
|
|
C | Reference : Two band solar absorption model of Paulson | |
| 16 |
|
|
C | and Simpson (1977, JPO, 7, 952-956) | |
| 17 |
|
|
C | Notes | |
| 18 |
|
|
C | ===== | |
| 19 |
|
|
C | Below 200m the solar penetration gets set to zero, | |
| 20 |
|
|
C | otherwise the limit for the exponent (+/- 5678) needs to | |
| 21 |
|
|
C | be taken care of. | |
| 22 |
|
|
C | Written by : Jan Morzel | |
| 23 |
|
|
C | Date : July 12, 1995 | |
| 24 |
|
|
C \==========================================================/ |
| 25 |
|
|
|
| 26 |
|
|
IMPLICIT NONE |
| 27 |
|
|
|
| 28 |
|
|
integer nwtype |
| 29 |
|
|
PARAMETER(nwtype=5) ! max number of different water types |
| 30 |
|
|
|
| 31 |
|
|
C === Routine arguments === |
| 32 |
|
|
|
| 33 |
|
|
C input arguments |
| 34 |
|
|
INTEGER imax ! number of vertical grid points |
| 35 |
|
|
_RS fact ! scale factor to apply to depth array |
| 36 |
|
|
_RS z(imax) ! vertical depth for desired sw fraction |
| 37 |
|
|
! (fact*z) is negative distance (m) from surface |
| 38 |
|
|
INTEGER jwtype ! index for jerlov water type |
| 39 |
|
|
|
| 40 |
|
|
C output arguments |
| 41 |
|
|
_RS swdk(imax) ! short wave (radiation) fractional decay |
| 42 |
|
|
|
| 43 |
|
|
C === Local variables === |
| 44 |
|
|
_RS facz |
| 45 |
|
|
REAL rfac(nwtype),a1(nwtype),a2(nwtype) |
| 46 |
|
|
INTEGER i |
| 47 |
|
|
C |
| 48 |
|
|
C Jerlov water type : I IA IB II III |
| 49 |
|
|
C jwtype 1 2 3 4 5 |
| 50 |
|
|
C |
| 51 |
|
|
DATA rfac / 0.58 , 0.62 , 0.67 , 0.77 , 0.78 / |
| 52 |
|
|
DATA a1 / 0.35 , 0.6 , 1.0 , 1.5 , 1.4 / |
| 53 |
|
|
DATA a2 / 23.0 , 20.0 , 17.0 , 14.0 , 7.9 / |
| 54 |
|
|
C |
| 55 |
|
|
DO i = 1,imax |
| 56 |
|
|
facz = fact*z(i) |
| 57 |
|
|
IF (facz .LT. (-200.)) THEN |
| 58 |
|
|
swdk(i) = 0. |
| 59 |
|
|
ELSE |
| 60 |
|
|
swdk(i) = rfac(jwtype) * exp(facz/a1(jwtype)) |
| 61 |
|
|
$ + (1.-rfac(jwtype)) * exp(facz/a2(jwtype)) |
| 62 |
|
|
ENDIF |
| 63 |
|
|
ENDDO |
| 64 |
|
|
|
| 65 |
|
|
RETURN |
| 66 |
|
|
END |
Parent Directory
| 
Revision Log
| 
Revision Graph