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Ecosystem transpiration and evaporation: Insights from three water flux partitioning methods across FLUXNET sites

Nelson, Jacob A.; Pérez‐Priego, Oscar; Zhou, Sha; Poyatos, Rafael; Zhang, Yao; Blanken, Peter D.; Gimeno, Teresa E.; Wohlfahrt, Georg; Desai, Ankur R.; Gioli, Beniamino; Limousin, Jean‐Marc; Bonal, Damien; Paul‐Limoges, Eugénie; Scott, Russell L.; Varlagin, Andrej; Fuchs, Kathrin; Montagnani, Leonardo; Wolf, Sebastian; Delpierre, Nicolas; Berveiller, Daniel; ... mehr

Abstract:
We apply and compare three widely applicable methods for estimating ecosystem transpiration (T) from eddy covariance (EC) data across 251 FLUXNET sites globally. All three methods are based on the coupled water and carbon relationship, but they differ in assumptions and parameterizations. Intercomparison of the three daily T estimates shows high correlation among methods (R between .89 and .94), but a spread in magnitudes of T/ET (evapotranspiration) from 45% to 77%. When compared at six sites with concurrent EC and sap flow measurements, all three EC‐based T estimates show higher correlation to sap flow‐based T than EC‐based ET. The partitioning methods show expected tendencies of T/ET increasing with dryness (vapor pressure deficit and days since rain) and with leaf area index (LAI). Analysis of 140 sites with high‐quality estimates for at least two continuous years shows that T/ET variability was 1.6 times higher across sites than across years. Spatial variability of T/ET was primarily driven by vegetation and soil characteristics (e.g., crop or grass designation, minimum annual LAI, soil coarse fragment volume) rather than climatic variables such as mean/standard deviation of temperature or precipitation. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126770
Veröffentlicht am 24.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 1354-1013, 1365-2486
KITopen-ID: 1000126770
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Global change biology
Band 26
Heft 12
Seiten 6916–6930
Vorab online veröffentlicht am 06.10.2020
Schlagwörter ecohydrology, eddy covariance, evaporation, evapotranspiration, FLUXNET, transpiration
Nachgewiesen in Web of Science
Scopus
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