Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes

Scott, Russell L.; Biederman, Joel A.

doi:10.1002/2017GL074324

Title: Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes

Journal Article · Wed Jul 12 00:00:00 EDT 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL074324· OSTI ID:1390369

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Southwest Watershed Research Center USDA Agricultural Research Service Tucson Arizona USA

Abstract The separate components of evapotranspiration (ET) elucidate the pathways and time scales over which water is returned to the atmosphere, but ecosystem‐scale measurements of transpiration ( T ) and evaporation ( E ) remain elusive. We propose a novel determination of E and T using multiyear eddy covariance estimates of ET and gross ecosystem photosynthesis (GEP). The method is applicable at water‐limited sites over time periods during which a linear regression between GEP (abscissa) and ET (ordinate) yields a positive ET axis intercept, an estimate of E . At four summer‐rainfall semiarid sites, T /ET increases to a peak coincident with maximum GEP and remains elevated as the growing season progresses, consistent with previous, direct measurements. The seasonal course of T /ET is related to increasing leaf area index and declining frequency of rainy days—an index of the wet surface conditions that promote E —suggesting both surface and climatic controls on ET partitioning.

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Sponsoring Organization:: USDOE

OSTI ID:: 1390369

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 44 Journal Issue: 13; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 85 works

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