Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles

Abstract Regional climate models (RCMs) are indispensable in climate research, albeit often characterized by biased terrestrial precipitation and water budgets. This study identifies excess oceanic evaporation, in conjunction with the RCMs’ boundary conditions, as drivers contributing to these biase...

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Autores principales:	Klaus Goergen, Stefan Kollet
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/83651ab8549145dba9653bee2c572098
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spelling	oai:doaj.org-article:83651ab8549145dba9653bee2c5720982021-12-02T11:39:43ZBoundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles10.1038/s41598-021-85744-y2045-2322https://doaj.org/article/83651ab8549145dba9653bee2c5720982021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85744-yhttps://doaj.org/toc/2045-2322Abstract Regional climate models (RCMs) are indispensable in climate research, albeit often characterized by biased terrestrial precipitation and water budgets. This study identifies excess oceanic evaporation, in conjunction with the RCMs’ boundary conditions, as drivers contributing to these biases in RCMs with forced sea surface temperatures in a CORDEX RCM ensemble over Europe. The RCMs are relaxed to the prescribed lateral boundary conditions originating from a global model, effectively matching the driving model's overall atmospheric moisture flux divergence. As a consequence, excess oceanic evaporation results in positive precipitation biases over land due to forced internal recycling of moisture to maintain the overall flux divergence prescribed by the boundary conditions. This systematic behaviour is shown through an analysis of long-term atmospheric water budgets and atmospheric moisture exchange between oceanic and continental areas in a multi-model ensemble.Klaus GoergenStefan KolletNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Klaus Goergen Stefan Kollet Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
description	Abstract Regional climate models (RCMs) are indispensable in climate research, albeit often characterized by biased terrestrial precipitation and water budgets. This study identifies excess oceanic evaporation, in conjunction with the RCMs’ boundary conditions, as drivers contributing to these biases in RCMs with forced sea surface temperatures in a CORDEX RCM ensemble over Europe. The RCMs are relaxed to the prescribed lateral boundary conditions originating from a global model, effectively matching the driving model's overall atmospheric moisture flux divergence. As a consequence, excess oceanic evaporation results in positive precipitation biases over land due to forced internal recycling of moisture to maintain the overall flux divergence prescribed by the boundary conditions. This systematic behaviour is shown through an analysis of long-term atmospheric water budgets and atmospheric moisture exchange between oceanic and continental areas in a multi-model ensemble.
format	article
author	Klaus Goergen Stefan Kollet
author_facet	Klaus Goergen Stefan Kollet
author_sort	Klaus Goergen
title	Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
title_short	Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
title_full	Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
title_fullStr	Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
title_full_unstemmed	Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
title_sort	boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/83651ab8549145dba9653bee2c572098
work_keys_str_mv	AT klausgoergen boundaryconditionandoceanicimpactsontheatmosphericwaterbalanceinlimitedareaclimatemodelensembles AT stefankollet boundaryconditionandoceanicimpactsontheatmosphericwaterbalanceinlimitedareaclimatemodelensembles
_version_	1718395710237310976

Boundary condition and oceanic impacts on the atmospheric water balance in limited area climate model ensembles

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