Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios
The variability of the Atlantic meridional overturning circulation (AMOC) is investigated in several climate simulations with the ECHO-G atmosphere-ocean general circulation model, including two forced integrations of the last millennium, one millennial-long control run, and two future scenario simu...
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ftird:oai:ird.fr:fdi:010055874 2024-09-09T19:43:30+00:00 Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios Ortega, P. Montoya, M. Gonzalez-Rouco, F. /Mignot, Juliette Legutke, S. 2012 https://www.documentation.ird.fr/hor/fdi:010055874 EN eng https://www.documentation.ird.fr/hor/fdi:010055874 oai:ird.fr:fdi:010055874 Ortega P., Montoya M., Gonzalez-Rouco F., Mignot Juliette, Legutke S. Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios. 2012, 38 (9-10), p. 1925-1947 Atlantic meridional overturning circulation Future climate change Multidecadal variability Forced millennial simulations text 2012 ftird 2024-08-15T05:57:42Z The variability of the Atlantic meridional overturning circulation (AMOC) is investigated in several climate simulations with the ECHO-G atmosphere-ocean general circulation model, including two forced integrations of the last millennium, one millennial-long control run, and two future scenario simulations of the twenty-first century. This constitutes a new framework in which the AMOC response to future climate change conditions is addressed in the context of both its past evolution and its natural variability. The main mechanisms responsible for the AMOC variability at interannual and multidecadal time scales are described. At high frequencies, the AMOC is directly responding to local changes in the Ekman transport, associated with three modes of climate variability: El Nio-Southern Oscillation (ENSO), the North Atlantic Oscillation (NAO), and the East Atlantic (EA) pattern. At low frequencies, the AMOC is largely controlled by convection activity south of Greenland. Again, the atmosphere is found to play a leading role in these variations. Positive anomalies of convection are preceded in 1 year by intensified zonal winds, associated in the forced runs to a positive NAO-like pattern. Finally, the sensitivity of the AMOC to three different forcing factors is investigated. The major impact is associated with increasing greenhouse gases, given their strong and persistent radiative forcing. Starting in the Industrial Era and continuing in the future scenarios, the AMOC experiences a final decrease of up to 40% with respect to the preindustrial average. Also, a weak but significant AMOC strengthening is found in response to the major volcanic eruptions, which produce colder and saltier surface conditions over the main convection regions. In contrast, no meaningful impact of the solar forcing on the AMOC is observed. Indeed, solar irradiance only affects convection in the Nordic Seas, with a marginal contribution to the AMOC variability in the ECHO-G runs. Text Greenland Nordic Seas North Atlantic North Atlantic oscillation IRD (Institute de recherche pour le développement): Horizon Greenland |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
Atlantic meridional overturning circulation Future climate change Multidecadal variability Forced millennial simulations |
spellingShingle |
Atlantic meridional overturning circulation Future climate change Multidecadal variability Forced millennial simulations Ortega, P. Montoya, M. Gonzalez-Rouco, F. /Mignot, Juliette Legutke, S. Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
topic_facet |
Atlantic meridional overturning circulation Future climate change Multidecadal variability Forced millennial simulations |
description |
The variability of the Atlantic meridional overturning circulation (AMOC) is investigated in several climate simulations with the ECHO-G atmosphere-ocean general circulation model, including two forced integrations of the last millennium, one millennial-long control run, and two future scenario simulations of the twenty-first century. This constitutes a new framework in which the AMOC response to future climate change conditions is addressed in the context of both its past evolution and its natural variability. The main mechanisms responsible for the AMOC variability at interannual and multidecadal time scales are described. At high frequencies, the AMOC is directly responding to local changes in the Ekman transport, associated with three modes of climate variability: El Nio-Southern Oscillation (ENSO), the North Atlantic Oscillation (NAO), and the East Atlantic (EA) pattern. At low frequencies, the AMOC is largely controlled by convection activity south of Greenland. Again, the atmosphere is found to play a leading role in these variations. Positive anomalies of convection are preceded in 1 year by intensified zonal winds, associated in the forced runs to a positive NAO-like pattern. Finally, the sensitivity of the AMOC to three different forcing factors is investigated. The major impact is associated with increasing greenhouse gases, given their strong and persistent radiative forcing. Starting in the Industrial Era and continuing in the future scenarios, the AMOC experiences a final decrease of up to 40% with respect to the preindustrial average. Also, a weak but significant AMOC strengthening is found in response to the major volcanic eruptions, which produce colder and saltier surface conditions over the main convection regions. In contrast, no meaningful impact of the solar forcing on the AMOC is observed. Indeed, solar irradiance only affects convection in the Nordic Seas, with a marginal contribution to the AMOC variability in the ECHO-G runs. |
format |
Text |
author |
Ortega, P. Montoya, M. Gonzalez-Rouco, F. /Mignot, Juliette Legutke, S. |
author_facet |
Ortega, P. Montoya, M. Gonzalez-Rouco, F. /Mignot, Juliette Legutke, S. |
author_sort |
Ortega, P. |
title |
Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
title_short |
Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
title_full |
Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
title_fullStr |
Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
title_full_unstemmed |
Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios |
title_sort |
variability of the atlantic meridional overturning circulation in the last millennium and two ipcc scenarios |
publishDate |
2012 |
url |
https://www.documentation.ird.fr/hor/fdi:010055874 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Nordic Seas North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Nordic Seas North Atlantic North Atlantic oscillation |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010055874 oai:ird.fr:fdi:010055874 Ortega P., Montoya M., Gonzalez-Rouco F., Mignot Juliette, Legutke S. Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios. 2012, 38 (9-10), p. 1925-1947 |
_version_ |
1809912956284043264 |