Modelling Actual, Potential and Reference Crop Evapotranspiration

Uses data and constants to calculate potential evapotranspiration (PET) and actual evapotranspiration (AET) from 21 different formulations including Penman, Penman-Monteith FAO 56, Priestley-Taylor and Morton formulations.


CHANGES IN Evapotranspiration VERSION 1.13


SIGNIFICANT USER-VISIBLE CHANGES o Significant speed up for the feature to detect maximum missing data duration in function 'ReadInputs' - tested for a daily dataset over 100 years and achieved a 4-fold speed up than version 1.12.

BUG FIXES o Fixed previous bug that ReadInputs didn't interpolate missing data in 'vs' and 'va'

MINOR CHANGES o User manual 'ET.Penman' and 'ET.PenmanMonteith' - specify that 'as' and 'bs' are needed in 'constants' when argument 'solar' = 'cloud' o User manual 'ET.MortonCRAE' and 'ET.MortonCRWE' - does not require 'z' (wind instrument height) in 'constants' o User manual 'climatedata' - subdaily RH has the unit of % o User manual 'constants' - a total of 36 constants instead of 46 o Corrected inconsistency: user manual 'ReadInputs' states that the four temperature inputs must be > -50 degC but the code has > -20 degC (-50 degC now used for both)


Reference manual

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1.13 by Danlu Guo, 15 days ago

Browse source code at

Authors: Danlu Guo [aut, cre] <[email protected]> , Seth Westra [aut] <[email protected]> , Tim Peterson [ctb] <[email protected]>

Documentation:   PDF Manual  

Task views: Hydrological Data and Modeling

GPL (>= 2) license

Depends on zoo

See at CRAN