Evidence map›Paper›PMID 38425750›Full record

ArticleClimate dynamics2024

Orbitally forced and internal changes in West African rainfall interannual-to-decadal variability for the last 6000 years.

Julien Crétat, Sandy P Harrison, Pascale Braconnot, Roberta d'Agostino, Johann Jungclaus, Gerrit Lohmann, Xiaoxu Shi, Olivier Marti

Abstract read
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Article in Climate dynamics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

8 authors.

Julien CrétatScience Partners, Paris, France.ORCID 0000-0002-2315-0672
Sandy P HarrisonDepartment of Geography and Environmental Science, University of Reading, Reading, RG6 6AB UK.
Pascale BraconnotLaboratoire des Sciences du Climat et de l'Environnement-IPSL, Unité Mixte CEA-CNRS-UVSQ, Université Paris-Saclay, Orme des Merisiers, Gif-sur-Yvette, France.
Roberta d'AgostinoMax Planck Institute for Meteorology, Hamburg, Germany.
Johann JungclausMax Planck Institute for Meteorology, Hamburg, Germany.
Gerrit LohmannAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
Xiaoxu ShiAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
Olivier MartiLaboratoire des Sciences du Climat et de l'Environnement-IPSL, Unité Mixte CEA-CNRS-UVSQ, Université Paris-Saclay, Orme des Merisiers, Gif-sur-Yvette, France.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Recent variability in West African monsoon rainfall (WAMR) has been shown to be influenced by multiple ocean-atmosphere modes, including the El Niño Southern Oscillation, Atlantic Multidecadal Oscillation and the Interdecadal Pacific Oscillation. How these modes will change in response to long term forcing is less well understood. Here we use four transient simulations driven by changes in orbital forcing and greenhouse gas concentrations over the past 6000 years to examine the relationship between West African monsoon rainfall multiscale variability and changes in the modes associated with this variability. All four models show a near linear decline in monsoon rainfall over the past 6000 years in response to the gradual weakening of the interhemispheric gradient in sea surface temperatures. The only indices that show a long-term trend are those associated with the strengthening of the El Niño Southern Oscillation from the mid-Holocene onwards. At the interannual-to-decadal timescale, WAMR variability is largely influenced by Pacific-Atlantic - Mediterranean Sea teleconnections in all simulations; the exact configurations are model sensitive. The WAMR interannual-to-decadal variability depicts marked multi-centennial oscillations, with La Niña/negative Pacific Decadal Oscillation and a weakening and/or poleward shift of subtropical high-pressure systems over the Atlantic favoring wet WAMR anomalies. The WAMR interannual-to-decadal variability also depicts an overall decreasing trend throughout the Holocene that is consistent among the simulations. This decreasing trend relates to changes in the North Atlantic and Gulf of Guinea Sea Surface Temperature variability. Supplementary Information: The online version contains supplementary material available at 10.1007/s00382-023-07023-y.

Indexed as

HoloceneInterannual-to-decadal rainfall variabilityMulti-centennial rainfall variabilityOcean–atmosphere climate modesTransient climate model simulationsWest African monsoon

Identifiers

PMID38425750
PMCPMC10899366

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