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  Functional relationships reveal differences in the water cycle representation of global water models

Gnann, S., Reinecke, R., Stein, L., Wada, Y., Thiery, W., Müller Schmied, H., Satoh, Y., Pokhrel, Y., Ostberg, S., Koutroulis, A., Hanasaki, N., Grillakis, M., Gosling, S. N., Burek, P., Bierkens, M. F. P., Wagener, T. (2023): Functional relationships reveal differences in the water cycle representation of global water models. - Nature Water, 1, 1079-1090.
https://doi.org/10.1038/s44221-023-00160-y

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 Creators:
Gnann, Sebastian1, Author
Reinecke, Robert1, Author
Stein, Lina1, Author
Wada, Yoshihide1, Author
Thiery, Wim1, Author
Müller Schmied, Hannes1, Author
Satoh, Yusuke1, Author
Pokhrel, Yadu1, Author
Ostberg, Sebastian2, Author              
Koutroulis, Aristeidis1, Author
Hanasaki, Naota1, Author
Grillakis, Manolis1, Author
Gosling, Simon N.1, Author
Burek, Peter1, Author
Bierkens, Marc F. P.1, Author
Wagener, Thorsten1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Global water models are increasingly used to understand past, present and future water cycles, but disagreements between simulated variables make model-based inferences uncertain. Although there is empirical evidence of different large-scale relationships in hydrology, these relationships are rarely considered in model evaluation. Here we evaluate global water models using functional relationships that capture the spatial co-variability of forcing variables (precipitation, net radiation) and key response variables (actual evapotranspiration, groundwater recharge, total runoff). Results show strong disagreement in both shape and strength of model-based functional relationships, especially for groundwater recharge. Empirical and theory-derived functional relationships show varying agreements with models, indicating that our process understanding is particularly uncertain for energy balance processes, groundwater recharge processes and in dry and/or cold regions. Functional relationships offer great potential for model evaluation and an opportunity for fundamental advances in global hydrology and Earth system research in general.

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Language(s): eng - English
 Dates: 2023-03-032023-11-012023-11-272023-12-01
 Publication Status: Finally published
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s44221-023-00160-y
Organisational keyword: RD2 - Climate Resilience
PIKDOMAIN: RD2 - Climate Resilience
Working Group: Land Use and Resilience
MDB-ID: No data to archive
Regional keyword: Global
Research topic keyword: Freshwater
Model / method: Model Intercomparison
Model / method: LPJmL
OATYPE: Hybrid Open Access
 Degree: -

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Title: Nature Water
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 1 Sequence Number: - Start / End Page: 1079 - 1090 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/2731-6084
Publisher: Nature