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dc.contributor.author
Müller, Omar Vicente
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dc.contributor.author
Vidale, Pier Luigi
dc.contributor.author
Vannière, Benoît
dc.contributor.author
Schiemann, Reinhard
dc.contributor.author
Senan, Retish
dc.contributor.author
Haarsma, Reindert J.
dc.contributor.author
Jungclaus, Johann H.
dc.date.available
2022-09-19T20:23:24Z
dc.date.issued
2020-11
dc.identifier.citation
Müller, Omar Vicente; Vidale, Pier Luigi; Vannière, Benoît; Schiemann, Reinhard; Senan, Retish; et al.; Land-Atmosphere Coupling Sensitivity to GCMs Resolution: A Multimodel Assessment of Local and Remote Processes in the Sahel Hot Spot; Amer Meteorological Soc; Journal Of Climate; 34; 3; 11-2020; 967-985
dc.identifier.issn
0894-8755
dc.identifier.uri
http://hdl.handle.net/11336/169386
dc.description.abstract
Land–atmosphere interactions are often interpreted as local effects, whereby the soil state drives local atmospheric conditions and feedbacks originate. However, nonlocal mechanisms can significantly modulate land–atmosphere exchanges and coupling. We make use of GCMs at different resolutions (low;18 and high;0.258) to separate the two contributions to coupling: better represented local processes versus the influence of improved large-scale circulation. We use a two-legged metric, complemented by a process-based assessment of four CMIP6 GCMs. Our results show that weakening, strengthening, and relocation of coupling hot spots occur at high resolution globally. The northward expansion of the Sahel hot spot, driven by nonlocal mechanisms, is the most notable change. The African easterly jet’s horizontal wind shear is enhanced in JJA due to better resolved orography at high resolution. This effect, combined with enhanced easterly moisture flux, favors the development of African easterly waves over the Sahel. More precipitation and soil moisture recharge produce strengthening of the coupling, where evapotranspiration remains controlled by soil moisture, and weakening where evapotranspiration depends on atmospheric demand. In SON, the atmospheric influence is weaker, but soil memory helps to maintain the coupling between soil moisture and evapotranspiration and the relocation of the hot spot at high resolution. The multimodel agreement provides robust evidence that atmospheric dynamics determines the onset of land–atmosphere interactions, while the soil state modulates their duration. Comparison of precipitation, soil moisture, and evapotranspiration against satellite data reveals that the enhanced moistening at high resolution significantly reduces model biases, supporting the realism of the hot-spot relocation.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Amer Meteorological Soc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
AFRICA
dc.subject
ATMOSPHERE-LAND INTERACTION
dc.subject
GENERAL CIRCULATION MODELS
dc.subject
MODEL EVALUATION/PERFORMANCE
dc.subject.classification
Investigación Climatológica
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Land-Atmosphere Coupling Sensitivity to GCMs Resolution: A Multimodel Assessment of Local and Remote Processes in the Sahel Hot Spot
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-03-14T21:08:17Z
dc.journal.volume
34
dc.journal.number
3
dc.journal.pagination
967-985
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Boston
dc.description.fil
Fil: Müller, Omar Vicente. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas. Centro de Estudios de Variabilidad y Cambio Climático; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Vidale, Pier Luigi. University of Reading. Departament of Meteorology; Reino Unido
dc.description.fil
Fil: Vannière, Benoît. University of Reading. Departament of Meteorology; Reino Unido
dc.description.fil
Fil: Schiemann, Reinhard. University of Reading. Departament of Meteorology; Reino Unido
dc.description.fil
Fil: Senan, Retish. European Centre For Medium-range Weather Forecasts; Reino Unido
dc.description.fil
Fil: Haarsma, Reindert J.. Royal Netherlands Meteorological Institute; Países Bajos
dc.description.fil
Fil: Jungclaus, Johann H.. Max Planck Institute For Meteorology; Alemania
dc.journal.title
Journal Of Climate
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.ametsoc.org/jcli/article/355558/Landatmosphere-Coupling-Sensitivity-to-GCMs
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1175/JCLI-D-20-0303.1
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