shrad
Author:
J. C. Coughlan
Date:
5/2/1989
Description:
this subroutine computes incident shortwave radiation and
net shortwave radiation for any given day based on surface
characteristics, 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 |
| asp | double | degrees | aspect |
| dslop | double | degrees | slope |
| slat | double | ENTER_UNITS | latitude |
| sehorz | double | ENTER_UNITS | ENTER_DESCRIPTION |
| swhorz | 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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