Modified Advection-Aridity Model of Evapotranspiration
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 6
Abstract
The original and modified versions of the advection-aridity (AA) model of regional evapotranspiration are tested with data from the Solar and Meteorological Surface Observation Network (SAMSON). The resulting long-term mean annual evapotranspiration estimates are validated against water balances of 25 watersheds that are minimally affected by human activity and contain at least one SAMSON station, as well as with similar closures of SAMSON-station/gridded precipitation and runoff. In general, model performance is very similar among the two versions, explaining at least 80% of the spatial variance in the long-term means, simultaneously remaining well within 10% of the water balance-based values in their station-averaged long-term mean annual evapotranspiration estimates. The modified AA model, however, can be used in humid as well as in arid regions with the same set of calibrated parameters, whereas the original AA model may require a recalibration.
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Acknowledgments
This work has partially been supported by the European Union’s Climate Change and Variability: Impact on Central and Eastern Europe (CLAVIER) FP6 project. The writers are grateful to the anonymous reviewers whose comments greatly improved the original version of the manuscript.
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Information
Published In
Journal of Hydrologic Engineering
Volume 14 • Issue 6 • June 2009
Pages: 569 - 574
Copyright
© 2009 ASCE.
History
Received: May 15, 2008
Accepted: Sep 15, 2008
Published online: May 15, 2009
Published in print: Jun 2009
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