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  The importance of radiation for semiempirical water-use efficiency models

Boese, S., Jung, M., Carvalhais, N., & Reichstein, M. (2017). The importance of radiation for semiempirical water-use efficiency models. Biogeosciences, 14(12), 3015-3026. doi:10.5194/bg-14-3015-2017.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-34C7-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-8399-C
Genre: Journal Article

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http://dx.doi.org/10.5194/bg-14-3015-2017 (Publisher version)
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 Creators:
Boese, Sven1, 2, Author              
Jung, Martin3, Author              
Carvalhais, Nuno1, Author              
Reichstein, Markus4, Author              
Affiliations:
1Model-Data Integration, Dr. Nuno Carvalhais, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938310              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              
3Global Diagnostic Modelling, Dr. Martin Jung, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938311              
4Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1688139              

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 Abstract: Water-use efficiency (WUE) is a fundamental property for the coupling of carbon and water cycles in plants and ecosystems. Existing model formulations predicting this variable differ in the type of response of WUE to the atmospheric vapor pressure deficit of water (VPD). We tested a representative WUE model on ecosystem scale at 110 eddy-covariance sites of the FLUXNET initiative by predicting evapotranspiration (ET) based on gross primary productivity (GPP) and VPD. We found that introducing an intercept term in the formulation increases model performance considerably, indicating that an additional factor needs to be considered. We demonstrate that this intercept term varies seasonally and we subsequently associate it with radiation. Replacing the constant intercept term with a linear function of global radiation was found to further improve model predictions of ET. Our new semi-empirical ecosystem WUE formulation indicates that, averaged over all sites, this radiation term accounts for up to half (40–49 %) of transpiration. These empirical findings challenge the current understanding of water-use efficiency on ecosystem-scale.

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 Dates: 2017-04-302017-06-22
 Publication Status: Published online
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 Identifiers: Other: BGC2574
DOI: 10.5194/bg-14-3015-2017
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Title: Biogeosciences
  Other : Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 14 (12) Sequence Number: - Start / End Page: 3015 - 3026 Identifier: ISSN: 1726-4170
CoNE: /journals/resource/111087929276006