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  Exploring the value of machine learning for weighted multi-model combination of an ensemble of global hydrological models

Zaherpour, J., Mount, N., Gosling, S. N., Dankers, R., Eisner, S., Gerten, D., Liu, X., Masaki, Y., Müller Schmied, H., Tang, Q., Wada, Y. (2019): Exploring the value of machine learning for weighted multi-model combination of an ensemble of global hydrological models. - Environmental Modelling and Software, 114, 112-128.
https://doi.org/10.1016/j.envsoft.2019.01.003

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 Creators:
Zaherpour, J.1, Author
Mount, N.1, Author
Gosling, S. N.1, Author
Dankers, R.1, Author
Eisner, S.1, Author
Gerten, Dieter2, Author              
Liu, X.1, Author
Masaki, Y.1, Author
Müller Schmied, H.1, Author
Tang, Q.1, Author
Wada, Y.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: This study presents a novel application of machine learning to deliver optimised, multi-model combinations (MMCs) of Global Hydrological Model (GHM) simulations. We exemplify the approach using runoff simulations from five GHMs across 40 large global catchments. The benchmarked, median performance gain of the MMC solutions is 45% compared to the best performing GHM and exceeds 100% when compared to the ensemble mean (EM). The performance gain offered by MMC suggests that future multi-model applications consider reporting MMCs, alongside the EM and intermodal range, to provide end-users of GHM ensembles with a better contextualised estimate of runoff. Importantly, the study highlights the difficulty of interpreting complex, non-linear MMC solutions in physical terms. This indicates that a pragmatic approach to future MMC studies based on machine learning methods is required, in which the allowable solution complexity is carefully constrained.

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 Dates: 2019
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.envsoft.2019.01.003
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8407
Research topic keyword: Freshwater
Model / method: LPJmL
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Terrestrial Safe Operating Space
 Degree: -

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Title: Environmental Modelling and Software
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 114 Sequence Number: - Start / End Page: 112 - 128 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals127