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

Jacob Nelson 1, * Oscar Pérez‐priego 2 Sha Zhou 3, 4 Rafael Poyatos 5, 6 Yao Zhang 3 Peter Blanken 7 Teresa Gimeno 8, 9 Georg Wohlfahrt 10 Ankur Desai 11 Beniamino Gioli 12 Jean‐marc Limousin 13 Damien Bonal 14 Eugénie Paul‐limoges 15 Russell Scott 16 Andrej Varlagin Kathrin Fuchs 17 Leonardo Montagnani Sebastian Wolf 18 Nicolas Delpierre 19 Daniel Berveiller 19 Mana Gharun 18 Luca Belelli Marchesini 20, 21 Damiano Gianelle 20 Ladislav Šigut 22 Ivan Mammarella 23 Lukas Siebicke T. Andrew Black 24 Alexander Knohl Lukas Hörtnagl 18 Vincenzo Magliulo 25 Simon Besnard 26, 1, 27 Ulrich Weber 1, 26 Nuno Carvalhais 1, 26, 28 Mirco Migliavacca 1, 26 Markus Reichstein 1, 26 Martin Jung 1, 26 
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. Overall, T and T/ET patterns are plausible and qualitatively consistent among the different water flux partitioning methods implying a significant advance made for estimating and understanding T globally, while the magnitudes remain uncertain. Our results represent the first extensive EC data‐based estimates of ecosystem T permitting a data‐driven perspective on the role of plants’ water use for global water and carbon cycling in a changing climate.
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https://hal.univ-lorraine.fr/hal-02995533
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Jacob Nelson, Oscar Pérez‐priego, Sha Zhou, Rafael Poyatos, Yao Zhang, et al.. Ecosystem transpiration and evaporation: Insights from three water flux partitioning methods across FLUXNET sites. Global Change Biology, 2020, 26 (12), pp.6916-6930. ⟨10.1111/gcb.15314⟩. ⟨hal-02995533⟩

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