Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes
Abstract
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.
- Authors:
-
- Southwest Watershed Research Center USDA Agricultural Research Service Tucson Arizona USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1390369
- Resource Type:
- Journal Article: Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 44 Journal Issue: 13; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Scott, Russell L., and Biederman, Joel A. Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes. United States: N. p., 2017.
Web. doi:10.1002/2017GL074324.
Scott, Russell L., & Biederman, Joel A. Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes. United States. https://doi.org/10.1002/2017GL074324
Scott, Russell L., and Biederman, Joel A. 2017.
"Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes". United States. https://doi.org/10.1002/2017GL074324.
@article{osti_1390369,
title = {Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes},
author = {Scott, Russell L. and Biederman, Joel A.},
abstractNote = {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.},
doi = {10.1002/2017GL074324},
url = {https://www.osti.gov/biblio/1390369},
journal = {Geophysical Research Letters},
issn = {0094-8276},
number = 13,
volume = 44,
place = {United States},
year = {Wed Jul 12 00:00:00 EDT 2017},
month = {Wed Jul 12 00:00:00 EDT 2017}
}
Web of Science
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