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Concerning the relationship between evapotranspiration and soil moistureThe relationship between the evapotranspiration and soil moisture during the drying, supply-limited phase is studied. A second scaling parameter, based on the evapotranspirational supply and demand concept of Federer (1982), is defined; the parameter, referred to as the threshold evapotranspiration, occurs in vegetation-covered surfaces just before leaf stomata close and when surface tension restricts moisture release from bare soil pores. A simple model for evapotranspiration is proposed. The effects of natural soil heterogeneities on evapotranspiration computed from the model are investigated. It is observed that the natural variability in soil moisture, caused by the heterogeneities, alters the relationship between regional evapotranspiration and the area average soil moisture.
Document ID
19870052970
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wetzel, Peter J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chang, Jy-Tai
(SASC Technologies, Inc. Hyattsville, MD, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Journal of Climate and Applied Meteorology
Volume: 26
ISSN: 0733-3021
Subject Category
Earth Resources And Remote Sensing
Accession Number
87A40244
Distribution Limits
Public
Copyright
Other

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