rad_and_vpd.c

Author:

Kevin Czajkowski

Date:

June 19, 1997

Description:

This subroutine calculates net radation and the vapor pressure deficit at the current time step for the current grid cell. The vapor pressure subroutine uses a regression curve and subroutine developed by John Kimball 1995 (references noted in aurad.c).

References

Input Variables:

Variable	Type	Units	Description
tmax	atmos_data_struct*	K	maximum temperature for the day.
tmin	atmos_data_struct*	K	minimum temperature for the day.
A1_TRANS	float	NA	Maximum clear sky transmittance, defined in rad_and_vpd.h
A2_TRANS	float	NA	lapse rate per meter of max. clear sky transmisttance, defined in rad_and_vpd.h

Output Variables:

Variable	Type	Units	Description
vpd	atmos_data_struct*	Pascals	vapor pressure deficit
shorwave	atmos_data_struct*	W m-2	net shortwave radiation
longwave	atmos_data_struct*	W m-2	net longwave radiation
rad	atmos_data_struct*	W m-2	net radiation

Subroutines Called:

svp
long_shortwave

Modifications and Limitations

Since this method derives questionable shortwave values, a different method to calculate the incoming shortwave is used for calculations of net radiation.

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Page Last Modified on 7/2/97