penman

Author:

Bart Nijssen

Date:

August 7, 1995

Description:

Calculate daily evapotranspiration using the Penman combination equation.

References

'Evaporation', Shuttleworth W.J. p4.16 in Maidment, E.R.[ed.](1993), Handbook of Hydrology.

Input Variables:

Variable

Type

Units

Description

raddoubleW/m2net radiation
vpddoublePavapor pressure deficit
radoubles/maerodynamic resistance
rsdoubles/mminimum stomatal resistance
rarcdoubles/marchitectural resistance
raddoubleleaf area to ground areaLAI
gsm_invdoubleNAsoil moisture stress factor (O:1)
tairdoubledeg Cair temperature
tsurfdoubledeg Csurface temperature
elevationfloatmmean grid elevation

Output Variables:

Variable

Type

Units

Description

evapdoublemm/daydaily potential evaporation

Subroutines Called:

svp_slope

Modifications and Limitations


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