Observed relation between evapotranspiration and soil moisture in the North American monsoon region

Enrique R. Vivoni, Hernan A. Moreno, Giuseppe Mascaro, Julio C. Rodriguez, Christopher J. Watts, Jaime Garatuza-Payan, Russell L. Scott

Research output: Contribution to journalArticle

100 Scopus citations

Abstract

Soil moisture control on evapotranspiration is poorly understood in ecosystems experiencing seasonal greening. In this study, we utilize a set of multi-year observations at four eddy covariance sites along a latitudinal gradient in vegetation greening to infer the ET-θ relation during the North American monsoon. Results reveal significant seasonal, interannual and ecosystem variations in the observed ET-θ relation directly linked to vegetation greening. In particular, monsoon-dominated ecosystems adjust their ET-θ relation, through changes in unstressed ET and plant stress threshold, to cope with differences in water availability. Comparisons of the observed relations to the North American Regional Reanalysis dataset reveal large biases that increase where vegetation greening is more significant. The analysis presented here can be used to guide improvements in land surface model parameterization in water-limited ecosystems.

Original languageEnglish (US)
Article numberL22403
JournalGeophysical Research Letters
Volume35
Issue number22
DOIs
StatePublished - Nov 28 2008
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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