Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation
We analyze the multi-earth system model responses of ocean temperatures and the Atlantic Meridional Overturning Circulation (AMOC) under an idealized solar radiation management scenario (G1) from the Geoengineering Model Intercomparison Project. All models simulate warming of the northern North Atla...
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ftnerc:oai:nora.nerc.ac.uk:517668 2023-05-15T15:08:34+02:00 Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation Hong, Yu Moore, John C Jevrejeva, Svetlana Ji, Duoying Phipps, Steven J Lenton, Andrew Tilmes, Simone Watanabe, Shingo Zhao, Liyun 2017-03 text http://nora.nerc.ac.uk/id/eprint/517668/ https://nora.nerc.ac.uk/id/eprint/517668/1/EnvResLett_Hong.pdf https://doi.org/10.1088/1748-9326/aa5fb8 en eng https://nora.nerc.ac.uk/id/eprint/517668/1/EnvResLett_Hong.pdf Hong, Yu; Moore, John C; Jevrejeva, Svetlana orcid:0000-0001-9490-4665 Ji, Duoying; Phipps, Steven J; Lenton, Andrew; Tilmes, Simone; Watanabe, Shingo; Zhao, Liyun. 2017 Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation. Environmental Research Letters, 12 (3). 034009. https://doi.org/10.1088/1748-9326/aa5fb8 <https://doi.org/10.1088/1748-9326/aa5fb8> cc_by CC-BY Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1088/1748-9326/aa5fb8 2023-02-04T19:45:17Z We analyze the multi-earth system model responses of ocean temperatures and the Atlantic Meridional Overturning Circulation (AMOC) under an idealized solar radiation management scenario (G1) from the Geoengineering Model Intercomparison Project. All models simulate warming of the northern North Atlantic relative to no geoengineering, despite geoengineering substantially offsetting the increases in mean global ocean temperatures. Increases in the temperature of the North Atlantic Ocean at the surface (~0.25 K) and at a depth of 500 m (~0.10 K) are mainly due to a 10 Wm−2 reduction of total heat flux from ocean to atmosphere. Although the AMOC is slightly reduced under the solar dimming scenario, G1, relative to piControl, it is about 37% stronger than under abrupt4 × CO2 . The reduction of the AMOC under G1 is mainly a response to the heat flux change at the northern North Atlantic rather than to changes in the water flux and the wind stress. The AMOC transfers heat from tropics to high latitudes, helping to warm the high latitudes, and its strength is maintained under solar dimming rather than weakened by greenhouse gas forcing acting alone. Hence the relative reduction in high latitude ocean temperatures provided by solar radiation geoengineering, would tend to be counteracted by the correspondingly active AMOC circulation which furthermore transports warm surface waters towards the Greenland ice sheet, warming Arctic sea ice and permafrost. Article in Journal/Newspaper Arctic Greenland Ice Ice Sheet North Atlantic permafrost Sea ice Natural Environment Research Council: NERC Open Research Archive Arctic Greenland Environmental Research Letters 12 3 034009 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
We analyze the multi-earth system model responses of ocean temperatures and the Atlantic Meridional Overturning Circulation (AMOC) under an idealized solar radiation management scenario (G1) from the Geoengineering Model Intercomparison Project. All models simulate warming of the northern North Atlantic relative to no geoengineering, despite geoengineering substantially offsetting the increases in mean global ocean temperatures. Increases in the temperature of the North Atlantic Ocean at the surface (~0.25 K) and at a depth of 500 m (~0.10 K) are mainly due to a 10 Wm−2 reduction of total heat flux from ocean to atmosphere. Although the AMOC is slightly reduced under the solar dimming scenario, G1, relative to piControl, it is about 37% stronger than under abrupt4 × CO2 . The reduction of the AMOC under G1 is mainly a response to the heat flux change at the northern North Atlantic rather than to changes in the water flux and the wind stress. The AMOC transfers heat from tropics to high latitudes, helping to warm the high latitudes, and its strength is maintained under solar dimming rather than weakened by greenhouse gas forcing acting alone. Hence the relative reduction in high latitude ocean temperatures provided by solar radiation geoengineering, would tend to be counteracted by the correspondingly active AMOC circulation which furthermore transports warm surface waters towards the Greenland ice sheet, warming Arctic sea ice and permafrost. |
format |
Article in Journal/Newspaper |
author |
Hong, Yu Moore, John C Jevrejeva, Svetlana Ji, Duoying Phipps, Steven J Lenton, Andrew Tilmes, Simone Watanabe, Shingo Zhao, Liyun |
spellingShingle |
Hong, Yu Moore, John C Jevrejeva, Svetlana Ji, Duoying Phipps, Steven J Lenton, Andrew Tilmes, Simone Watanabe, Shingo Zhao, Liyun Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
author_facet |
Hong, Yu Moore, John C Jevrejeva, Svetlana Ji, Duoying Phipps, Steven J Lenton, Andrew Tilmes, Simone Watanabe, Shingo Zhao, Liyun |
author_sort |
Hong, Yu |
title |
Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
title_short |
Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
title_full |
Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
title_fullStr |
Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
title_full_unstemmed |
Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation |
title_sort |
impact of the geomip g1 sunshade geoengineering experiment on the atlantic meridional overturning circulation |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/517668/ https://nora.nerc.ac.uk/id/eprint/517668/1/EnvResLett_Hong.pdf https://doi.org/10.1088/1748-9326/aa5fb8 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Ice Sheet North Atlantic permafrost Sea ice |
genre_facet |
Arctic Greenland Ice Ice Sheet North Atlantic permafrost Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/517668/1/EnvResLett_Hong.pdf Hong, Yu; Moore, John C; Jevrejeva, Svetlana orcid:0000-0001-9490-4665 Ji, Duoying; Phipps, Steven J; Lenton, Andrew; Tilmes, Simone; Watanabe, Shingo; Zhao, Liyun. 2017 Impact of the GeoMIP G1 sunshade geoengineering experiment on the Atlantic meridional overturning circulation. Environmental Research Letters, 12 (3). 034009. https://doi.org/10.1088/1748-9326/aa5fb8 <https://doi.org/10.1088/1748-9326/aa5fb8> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1088/1748-9326/aa5fb8 |
container_title |
Environmental Research Letters |
container_volume |
12 |
container_issue |
3 |
container_start_page |
034009 |
_version_ |
1766339898702299136 |