Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes
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 edd...
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| Format: | Article |
| Language: | English |
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Wiley
2017-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL074324 |
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| author | Russell L. Scott Joel A. Biederman |
| author_facet | Russell L. Scott Joel A. Biederman |
| author_sort | Russell L. Scott |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c4239f78acfb4a6cb7995f47aa0c7b71 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-c4239f78acfb4a6cb7995f47aa0c7b712025-08-20T01:51:46ZengWileyGeophysical Research Letters0094-82761944-80072017-07-0144136833684010.1002/2017GL074324Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxesRussell L. Scott0Joel A. Biederman1Southwest Watershed Research Center USDA Agricultural Research Service Tucson Arizona USASouthwest Watershed Research Center USDA Agricultural Research Service Tucson Arizona USAAbstract 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.https://doi.org/10.1002/2017GL074324evapotranspirationtranspirationevaporationeddy covariancewatercarbon |
| spellingShingle | Russell L. Scott Joel A. Biederman Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes Geophysical Research Letters evapotranspiration transpiration evaporation eddy covariance water carbon |
| title | Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes |
| title_full | Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes |
| title_fullStr | Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes |
| title_full_unstemmed | Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes |
| title_short | Partitioning evapotranspiration using long‐term carbon dioxide and water vapor fluxes |
| title_sort | partitioning evapotranspiration using long term carbon dioxide and water vapor fluxes |
| topic | evapotranspiration transpiration evaporation eddy covariance water carbon |
| url | https://doi.org/10.1002/2017GL074324 |
| work_keys_str_mv | AT russelllscott partitioningevapotranspirationusinglongtermcarbondioxideandwatervaporfluxes AT joelabiederman partitioningevapotranspirationusinglongtermcarbondioxideandwatervaporfluxes |