!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer
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!
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!See the above mentioned License/Disclaimer for more details.
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***S/P RAYSOL
*
SUBROUTINE RAYSOL(RSOL,AL,LAT,LON,TAU,DATE,KOUNT,N)
*
#include "impnone.cdk"
INTEGER N
REAL RSOL(N),AL(N),LAT(N),LON(N),TAU
INTEGER DATE(14),KOUNT
*
*Author
* J. Cote RPN (August 83)
*
*Revision
* 001 J. Cote RPN(Nov 1984)SEF version documentation
* 002 M. Lepine - RFE model code revision project (Feb 87)
* 003 MJ L'Heureux (Mar89) Initialization at KOUNT=0
* 004 N. Brunet (May91)
* New version of thermodynamic functions
* and file of constants
*
*Object
* to calculate the radiation at the ground
*
*Arguments
*
* - Output -
* RSOL radiation at the ground
*
* - Input -
* AL surface albedo
* LAT latitude in radians
* LON longitude in radians
* TAU timestep
* DATE array for date
* KOUNT timestep counter
* N horizontal dimension
*
*Notes
* RSOL = (1-ALBEDO)*S0*(1-ATENU)*COS(zenith angle of sun)
* where S0 = solar constant (WATT/M**2) and ATENU=absorption
* due to the atmosphere
*
*
*IMPLICITES
*
#include "consphy.cdk"
#include "clefcon.cdk"
*
**
*
REAL ATENU
SAVE ATENU
REAL HEURE,AJOUR,DGRD,DECLIN,CTE,HRRD,CD,SD
INTEGER J
*
DATA ATENU / 0.35 /
*
*
* DECLIN=DECLINAISON SOLAIRE AU-DESSUS DE EQUATEUR
* HEURE=G.M.T.
* CALCULEES AU MOYEN DE DATE FORMULES TIREES DE S/R CONRAD (V8)
*
* FORMULES PRISES DANS S/R
* CONRAD (V8)
*
HEURE=AMOD(FLOAT(DATE(5))+FLOAT(KOUNT)*TAU/3600.0,24.0)
AJOUR=30.4*FLOAT(DATE(2)-1)+FLOAT(DATE(3))
DGRD=ACOS(-1.0)/180.0
DECLIN=23.61*COS(DGRD*(360.0*((AJOUR+10.0)/365.25-0.5)))
CTE = CONSOL*(1.0-ATENU)
HRRD=DGRD*15.0*(HEURE-12.0)
CD=CTE*COS(DECLIN*DGRD)
SD=CTE*SIN(DECLIN*DGRD)
DO 1 J=1,N
*
RSOL(J)=(1.0-AL(J))*(SIN(LAT(J))*SD+COS(LAT(J))*CD*
X COS(LON(J)+HRRD))
1 RSOL(J)=MAX(0.0,RSOL(J))
*
RETURN
END