How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean
We investigate how the ocean response to CO 2 forcing affects hemispheric asymmetries in polar climate sensitivity. Intermodel comparison of Phase 5 of the Coupled Model Intercomparison Project CO 2 quadrupling experiments shows that even in models where hemispheric ocean heat uptake differences are...
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Online Access: | http://www.osti.gov/servlets/purl/1490383 https://www.osti.gov/biblio/1490383 https://doi.org/10.1029/2018GL079023 |
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ftosti:oai:osti.gov:1490383 2023-07-30T03:55:40+02:00 How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean Singh, H. A. Garuba, O. A. Rasch, P. J. 2021-08-30 application/pdf http://www.osti.gov/servlets/purl/1490383 https://www.osti.gov/biblio/1490383 https://doi.org/10.1029/2018GL079023 unknown http://www.osti.gov/servlets/purl/1490383 https://www.osti.gov/biblio/1490383 https://doi.org/10.1029/2018GL079023 doi:10.1029/2018GL079023 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1029/2018GL079023 2023-07-11T09:30:54Z We investigate how the ocean response to CO 2 forcing affects hemispheric asymmetries in polar climate sensitivity. Intermodel comparison of Phase 5 of the Coupled Model Intercomparison Project CO 2 quadrupling experiments shows that even in models where hemispheric ocean heat uptake differences are small, Arctic warming still exceeds Antarctic warming. The polar climate impact of this evolving ocean response to CO 2 forcing is then isolated using slab ocean experiments in a state-of-the-art climate model. Overall, feedbacks over the Southern Hemisphere more effectively dissipate top-of-atmosphere anomalies than those over the Northern Hemisphere. Furthermore, a poleward shift in ocean heat convergence in both hemispheres amplifies destabilizing ice albedo and lapse rate feedbacks over the Arctic much more so than over the Antarctic. These results suggest that the Arctic is intrinsically more sensitive to both CO 2 and oceanic forcings than the Antarctic and that ocean-driven climate sensitivity asymmetry arises from feedback destabilization over the Arctic rather than feedback stabilization over the Antarctic. Other/Unknown Material albedo Antarc* Antarctic Arctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Antarctic The Antarctic Geophysical Research Letters 45 23 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Singh, H. A. Garuba, O. A. Rasch, P. J. How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
We investigate how the ocean response to CO 2 forcing affects hemispheric asymmetries in polar climate sensitivity. Intermodel comparison of Phase 5 of the Coupled Model Intercomparison Project CO 2 quadrupling experiments shows that even in models where hemispheric ocean heat uptake differences are small, Arctic warming still exceeds Antarctic warming. The polar climate impact of this evolving ocean response to CO 2 forcing is then isolated using slab ocean experiments in a state-of-the-art climate model. Overall, feedbacks over the Southern Hemisphere more effectively dissipate top-of-atmosphere anomalies than those over the Northern Hemisphere. Furthermore, a poleward shift in ocean heat convergence in both hemispheres amplifies destabilizing ice albedo and lapse rate feedbacks over the Arctic much more so than over the Antarctic. These results suggest that the Arctic is intrinsically more sensitive to both CO 2 and oceanic forcings than the Antarctic and that ocean-driven climate sensitivity asymmetry arises from feedback destabilization over the Arctic rather than feedback stabilization over the Antarctic. |
author |
Singh, H. A. Garuba, O. A. Rasch, P. J. |
author_facet |
Singh, H. A. Garuba, O. A. Rasch, P. J. |
author_sort |
Singh, H. A. |
title |
How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
title_short |
How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
title_full |
How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
title_fullStr |
How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
title_full_unstemmed |
How Asymmetries Between Arctic and Antarctic Climate Sensitivity Are Modified by the Ocean |
title_sort |
how asymmetries between arctic and antarctic climate sensitivity are modified by the ocean |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1490383 https://www.osti.gov/biblio/1490383 https://doi.org/10.1029/2018GL079023 |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
albedo Antarc* Antarctic Arctic |
genre_facet |
albedo Antarc* Antarctic Arctic |
op_relation |
http://www.osti.gov/servlets/purl/1490383 https://www.osti.gov/biblio/1490383 https://doi.org/10.1029/2018GL079023 doi:10.1029/2018GL079023 |
op_doi |
https://doi.org/10.1029/2018GL079023 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
23 |
_version_ |
1772821152509460480 |