Volcanic impact on the Atlantic Ocean over the last millennium
The oceanic response to volcanic eruptions over the last 1000 years is investigated with a focus on the North Atlantic Ocean, using a fully coupled AOGCM forced by a realistic time series of volcanic eruptions, total solar irradiance (TSI) and atmospheric greenhouse gases concentration. The model si...
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ftcopernicus:oai:publications.copernicus.org:cp12247 2023-05-15T17:34:01+02:00 Volcanic impact on the Atlantic Ocean over the last millennium Mignot, J. Khodri, M. Frankignoul, C. Servonnat, J. 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/cp-7-1439-2011 https://cp.copernicus.org/articles/7/1439/2011/ eng eng info:eu-repo/grantAgreement/EC/FP7/212643 doi:10.5194/cp-7-1439-2011 https://cp.copernicus.org/articles/7/1439/2011/ info:eu-repo/semantics/openAccess eISSN: 1814-9332 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/cp-7-1439-2011 2020-07-20T16:25:57Z The oceanic response to volcanic eruptions over the last 1000 years is investigated with a focus on the North Atlantic Ocean, using a fully coupled AOGCM forced by a realistic time series of volcanic eruptions, total solar irradiance (TSI) and atmospheric greenhouse gases concentration. The model simulates little response to TSI variations but a strong and long-lasting thermal and dynamical oceanic adjustment to volcanic forcing, which is shown to be a function of the time period of the volcanic eruptions. The thermal response consists of a fast tropical cooling due to the radiative forcing by the volcanic eruptions, followed by a penetration of this cooling in the subtropical ocean interior one to five years after the eruption, and propagation of the anomalies toward the high latitudes. The oceanic circulation first adjusts rapidly to low latitude anomalous wind stress induced by the strong cooling. The Atlantic Meridional Overturning Circulation (AMOC) shows a significant intensification 5 to 10 years after the eruptions of the period post-1400 A.D., in response to anomalous atmospheric momentum forcing, and a slight weakening in the following decade. In response to the stronger eruptions occurring between 1100 and 1300, the AMOC shows no intensification and a stronger reduction after 10 years. This study thus stresses the diversity of AMOC response to volcanic eruptions in climate models and discusses possible explanations. Other/Unknown Material North Atlantic Copernicus Publications: E-Journals Climate of the Past 7 4 1439 1455 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The oceanic response to volcanic eruptions over the last 1000 years is investigated with a focus on the North Atlantic Ocean, using a fully coupled AOGCM forced by a realistic time series of volcanic eruptions, total solar irradiance (TSI) and atmospheric greenhouse gases concentration. The model simulates little response to TSI variations but a strong and long-lasting thermal and dynamical oceanic adjustment to volcanic forcing, which is shown to be a function of the time period of the volcanic eruptions. The thermal response consists of a fast tropical cooling due to the radiative forcing by the volcanic eruptions, followed by a penetration of this cooling in the subtropical ocean interior one to five years after the eruption, and propagation of the anomalies toward the high latitudes. The oceanic circulation first adjusts rapidly to low latitude anomalous wind stress induced by the strong cooling. The Atlantic Meridional Overturning Circulation (AMOC) shows a significant intensification 5 to 10 years after the eruptions of the period post-1400 A.D., in response to anomalous atmospheric momentum forcing, and a slight weakening in the following decade. In response to the stronger eruptions occurring between 1100 and 1300, the AMOC shows no intensification and a stronger reduction after 10 years. This study thus stresses the diversity of AMOC response to volcanic eruptions in climate models and discusses possible explanations. |
format |
Other/Unknown Material |
author |
Mignot, J. Khodri, M. Frankignoul, C. Servonnat, J. |
spellingShingle |
Mignot, J. Khodri, M. Frankignoul, C. Servonnat, J. Volcanic impact on the Atlantic Ocean over the last millennium |
author_facet |
Mignot, J. Khodri, M. Frankignoul, C. Servonnat, J. |
author_sort |
Mignot, J. |
title |
Volcanic impact on the Atlantic Ocean over the last millennium |
title_short |
Volcanic impact on the Atlantic Ocean over the last millennium |
title_full |
Volcanic impact on the Atlantic Ocean over the last millennium |
title_fullStr |
Volcanic impact on the Atlantic Ocean over the last millennium |
title_full_unstemmed |
Volcanic impact on the Atlantic Ocean over the last millennium |
title_sort |
volcanic impact on the atlantic ocean over the last millennium |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-7-1439-2011 https://cp.copernicus.org/articles/7/1439/2011/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1814-9332 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/212643 doi:10.5194/cp-7-1439-2011 https://cp.copernicus.org/articles/7/1439/2011/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-7-1439-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1439 |
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1455 |
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1766132703244058624 |