Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation
The impact of climate change on Sahel precipitation is uncertain and has to be widely documented. Recently, it has been shown that Arctic sea ice loss leverages the global warming effects worldwide, suggesting a potential impact of Arctic sea ice decline on tropical regions. However, defining the sp...
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ftunivreading:oai:centaur.reading.ac.uk:79713 2024-06-23T07:48:42+00:00 Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation Monerie, Paul-Arthur Oudar, Thomas Sanchez-Gomez, Emilia 2019 text https://centaur.reading.ac.uk/79713/ https://centaur.reading.ac.uk/79713/2/Monerie2018_Article_RespectiveImpactsOfArcticSeaIc.pdf https://centaur.reading.ac.uk/79713/1/Monerie_orig.pdf en eng Springer https://centaur.reading.ac.uk/79713/2/Monerie2018_Article_RespectiveImpactsOfArcticSeaIc.pdf https://centaur.reading.ac.uk/79713/1/Monerie_orig.pdf Monerie, P.-A. <https://centaur.reading.ac.uk/view/creators/90007727.html> orcid:0000-0002-5304-9559 , Oudar, T. and Sanchez-Gomez, E. (2019) Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation. Climate Dynamics, 52 (9-10). pp. 5947-5964. ISSN 0930-7575 doi: https://doi.org/10.1007/s00382-018-4488-5 <https://doi.org/10.1007/s00382-018-4488-5> cc_by_4 Article PeerReviewed 2019 ftunivreading https://doi.org/10.1007/s00382-018-4488-5 2024-06-11T15:08:23Z The impact of climate change on Sahel precipitation is uncertain and has to be widely documented. Recently, it has been shown that Arctic sea ice loss leverages the global warming effects worldwide, suggesting a potential impact of Arctic sea ice decline on tropical regions. However, defining the specific roles of increasing greenhouse gases (GHG) concentration and declining Arctic sea ice extent on Sahel climate is not straightforward since the former impacts the latter. We avoid this dependency by analysing idealized experiments performed with the CNRM-CM5 coupled model. Results show that the increase in GHG concentration explains most of the Sahel precipitation change. We found that the impact due to Arctic sea ice loss depends on the level of atmospheric GHG concentration. When the GHG concentration is relatively low (values representative of 1980s), then the impact is moderate over the Sahel. However, when the concentration in GHG is levelled up, then Arctic sea ice loss leads to increased Sahel precipitation. In this particular case the ocean-land meridional gradient of temperature strengthens, allowing a more intense monsoon circulation. We linked the non-linearity of Arctic sea ice decline impact with differences in temperature and sea level pressure changes over the North Atlantic Ocean. We argue that the impact of the Arctic sea ice loss will become more relevant with time, in the context of climate change. Article in Journal/Newspaper Arctic Arctic Climate change Global warming North Atlantic Sea ice CentAUR: Central Archive at the University of Reading Arctic Climate Dynamics 52 9-10 5947 5964 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
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English |
description |
The impact of climate change on Sahel precipitation is uncertain and has to be widely documented. Recently, it has been shown that Arctic sea ice loss leverages the global warming effects worldwide, suggesting a potential impact of Arctic sea ice decline on tropical regions. However, defining the specific roles of increasing greenhouse gases (GHG) concentration and declining Arctic sea ice extent on Sahel climate is not straightforward since the former impacts the latter. We avoid this dependency by analysing idealized experiments performed with the CNRM-CM5 coupled model. Results show that the increase in GHG concentration explains most of the Sahel precipitation change. We found that the impact due to Arctic sea ice loss depends on the level of atmospheric GHG concentration. When the GHG concentration is relatively low (values representative of 1980s), then the impact is moderate over the Sahel. However, when the concentration in GHG is levelled up, then Arctic sea ice loss leads to increased Sahel precipitation. In this particular case the ocean-land meridional gradient of temperature strengthens, allowing a more intense monsoon circulation. We linked the non-linearity of Arctic sea ice decline impact with differences in temperature and sea level pressure changes over the North Atlantic Ocean. We argue that the impact of the Arctic sea ice loss will become more relevant with time, in the context of climate change. |
format |
Article in Journal/Newspaper |
author |
Monerie, Paul-Arthur Oudar, Thomas Sanchez-Gomez, Emilia |
spellingShingle |
Monerie, Paul-Arthur Oudar, Thomas Sanchez-Gomez, Emilia Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
author_facet |
Monerie, Paul-Arthur Oudar, Thomas Sanchez-Gomez, Emilia |
author_sort |
Monerie, Paul-Arthur |
title |
Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
title_short |
Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
title_full |
Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
title_fullStr |
Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
title_full_unstemmed |
Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation |
title_sort |
respective impacts of arctic sea ice decline and increasing greenhouse gases concentration on sahel precipitation |
publisher |
Springer |
publishDate |
2019 |
url |
https://centaur.reading.ac.uk/79713/ https://centaur.reading.ac.uk/79713/2/Monerie2018_Article_RespectiveImpactsOfArcticSeaIc.pdf https://centaur.reading.ac.uk/79713/1/Monerie_orig.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change Global warming North Atlantic Sea ice |
genre_facet |
Arctic Arctic Climate change Global warming North Atlantic Sea ice |
op_relation |
https://centaur.reading.ac.uk/79713/2/Monerie2018_Article_RespectiveImpactsOfArcticSeaIc.pdf https://centaur.reading.ac.uk/79713/1/Monerie_orig.pdf Monerie, P.-A. <https://centaur.reading.ac.uk/view/creators/90007727.html> orcid:0000-0002-5304-9559 , Oudar, T. and Sanchez-Gomez, E. (2019) Respective impacts of Arctic sea ice decline and increasing greenhouse gases concentration on Sahel precipitation. Climate Dynamics, 52 (9-10). pp. 5947-5964. ISSN 0930-7575 doi: https://doi.org/10.1007/s00382-018-4488-5 <https://doi.org/10.1007/s00382-018-4488-5> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1007/s00382-018-4488-5 |
container_title |
Climate Dynamics |
container_volume |
52 |
container_issue |
9-10 |
container_start_page |
5947 |
op_container_end_page |
5964 |
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1802639024240721920 |