fltrad

Author:

J. C. Coughlan

Date:

5/2/1989

Description:

flat surface radiation computation.

slope = 0 aspect = 0

This subroutine computes incident shortwave radiation and net shortwave radiation for any given day based on sun-earth geometry, transmissivity;

References

Buffo, J., L. Fritschen, and J. Murphy, Direct solar radiation on various slopes from 0 to 60 north latitude. USDA Forest Service Paper Research Paper PNW-142, 1972.

Swift, L. W. Jr., Algortihm for solar radiation on mountain slopes. Water Resources Research, v.12, p.108-112, 1976.

Input Variables:

Variable	Type	Units	Description
sehorz	double	ENTER_UNITS	ENTER_DESCRIPTION
swhorz	double	ENTER_UNITS	ENTER_DESCRIPTION
slat	double	ENTER_UNITS	ENTER_DESCRIPTION
jday	int	day	Day of year
tranday	double	ENTER_UNITS	ENTER_DESCRIPTION

Output Variables:

Variable	Type	Units	Description
radn	double	W/m^2	Incident shortwave radiation

Subroutines Called:

Modifications and Limitations

modified - 5/ /1990 r nemani jp patterson

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