A surface energy balance method for partitioning evapotranspiration data into plant and soil components for a surface with partial canopy cover

A surface energy balance method for partitioning evapotranspiration data into plant and soil... An objective, data‐based method for partitioning evapotranspiration (ET) measurements into soil and plant contributions is proposed and applied to a semiarid shortgrass steppe site in northeastern Colorado. This method requires fairly standard micrometeorological/surface energy balance measurements and relies on a two‐source Penman‐Monteith model of ET and a submodel (proposed and developed in this study) that relates the soil evaporation resistance to the soil Bowen ratio. Assuming that these soil parameters do not vary much during any given day, their daily values are determined by an optimization procedure which exploits the diurnal change in the meteorological data. Once the soil resistance and soil Bowen ratio are determined, the available energy and the ET data are partitioned into soil and plant components and then the canopy resistance and the within‐canopy aerodynamic resistance (herein referred to as the subcanopy resistance) are determined. Comparisons between the present results and other observations made in the shortgrass steppe ecosystem provide support for the validity of the present methods. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

A surface energy balance method for partitioning evapotranspiration data into plant and soil components for a surface with partial canopy cover

Water Resources Research, Volume 28 (6) – Jun 1, 1992

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Publisher
Wiley
Copyright
This paper is not subject to U.S.Copyright © 1992 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
DOI
10.1029/92WR00217
Publisher site
See Article on Publisher Site

Abstract

An objective, data‐based method for partitioning evapotranspiration (ET) measurements into soil and plant contributions is proposed and applied to a semiarid shortgrass steppe site in northeastern Colorado. This method requires fairly standard micrometeorological/surface energy balance measurements and relies on a two‐source Penman‐Monteith model of ET and a submodel (proposed and developed in this study) that relates the soil evaporation resistance to the soil Bowen ratio. Assuming that these soil parameters do not vary much during any given day, their daily values are determined by an optimization procedure which exploits the diurnal change in the meteorological data. Once the soil resistance and soil Bowen ratio are determined, the available energy and the ET data are partitioned into soil and plant components and then the canopy resistance and the within‐canopy aerodynamic resistance (herein referred to as the subcanopy resistance) are determined. Comparisons between the present results and other observations made in the shortgrass steppe ecosystem provide support for the validity of the present methods.

Journal

Water Resources ResearchWiley

Published: Jun 1, 1992

References

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