Geography

Observed timescales of evapotranspiration response to soil moisture

Document Type

Article

Abstract

The sensitivity of evapotranspiration (ET) to soil moisture storage plays an important role in the land-atmosphere system. Yet little is known about its magnitude, or its dependence on vegetation, soil, and/or climate characteristics. Here we relate the sensitivity to the timescale of ET decay in absence of rainfall, and show that it can thus be derived from time series of ET alone. We analyze ET observations-from 15 vegetated sites covering a range of climates conditions, yielding timescales of 15-35 days. Longer timescales (weaker ET sensitivity) are found in regions with seasonal droughts, or at sites with woody vegetation. We compare observed values with output of different land surface models (LSMs) from the Second Global Soil Wetness Project, revealing large inter-model differences and significant differences with observations. Our methodology can lead to improved representation of soil moisture effects on ET in LSMs. Copyright 2006 by the American Geophysical Union.

Publication Title

Geophysical Research Letters

Publication Date

12-16-2006

Volume

33

Issue

23

ISSN

0094-8276

DOI

10.1029/2006GL028178

Keywords

evapotranspiration, soil moisture

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