The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity
The mechanism triggering centennial-to-millennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the earth system model of intermediate complexity LOVECLIM is investigated. It is found that for several climate boundary conditions such as low obliquity values (~22.1°)...
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ftcopernicus:oai:publications.copernicus.org:gmd2951 2023-05-15T16:35:20+02:00 The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity Friedrich, T. Timmermann, A. Menviel, L. Elison Timm, O. Mouchet, A. Roche, D. M. 2018-09-27 application/pdf https://doi.org/10.5194/gmd-3-377-2010 https://gmd.copernicus.org/articles/3/377/2010/ eng eng doi:10.5194/gmd-3-377-2010 https://gmd.copernicus.org/articles/3/377/2010/ eISSN: 1991-9603 Text 2018 ftcopernicus https://doi.org/10.5194/gmd-3-377-2010 2020-07-20T16:26:21Z The mechanism triggering centennial-to-millennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the earth system model of intermediate complexity LOVECLIM is investigated. It is found that for several climate boundary conditions such as low obliquity values (~22.1°) or LGM-albedo, internally generated centennial-to-millennial-scale variability occurs in the North Atlantic region. Stochastic excitations of the density-driven overturning circulation in the Nordic Seas can create regional sea-ice anomalies and a subsequent reorganization of the atmospheric circulation. The resulting remote atmospheric anomalies over the Hudson Bay can release freshwater pulses into the Labrador Sea and significantly increase snow fall in this region leading to a subsequent reduction of convective activity. The millennial-scale AMOC oscillations disappear if LGM bathymetry (with closed Hudson Bay) is prescribed or if freshwater pulses are suppressed artificially. Furthermore, our study documents the process of the AMOC recovery as well as the global marine and terrestrial carbon cycle response to centennial-to-millennial-scale AMOC variability. Text Hudson Bay Labrador Sea Nordic Seas North Atlantic Sea ice Copernicus Publications: E-Journals Hudson Hudson Bay Geoscientific Model Development 3 2 377 389 |
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Copernicus Publications: E-Journals |
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English |
description |
The mechanism triggering centennial-to-millennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the earth system model of intermediate complexity LOVECLIM is investigated. It is found that for several climate boundary conditions such as low obliquity values (~22.1°) or LGM-albedo, internally generated centennial-to-millennial-scale variability occurs in the North Atlantic region. Stochastic excitations of the density-driven overturning circulation in the Nordic Seas can create regional sea-ice anomalies and a subsequent reorganization of the atmospheric circulation. The resulting remote atmospheric anomalies over the Hudson Bay can release freshwater pulses into the Labrador Sea and significantly increase snow fall in this region leading to a subsequent reduction of convective activity. The millennial-scale AMOC oscillations disappear if LGM bathymetry (with closed Hudson Bay) is prescribed or if freshwater pulses are suppressed artificially. Furthermore, our study documents the process of the AMOC recovery as well as the global marine and terrestrial carbon cycle response to centennial-to-millennial-scale AMOC variability. |
format |
Text |
author |
Friedrich, T. Timmermann, A. Menviel, L. Elison Timm, O. Mouchet, A. Roche, D. M. |
spellingShingle |
Friedrich, T. Timmermann, A. Menviel, L. Elison Timm, O. Mouchet, A. Roche, D. M. The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
author_facet |
Friedrich, T. Timmermann, A. Menviel, L. Elison Timm, O. Mouchet, A. Roche, D. M. |
author_sort |
Friedrich, T. |
title |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
title_short |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
title_full |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
title_fullStr |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
title_full_unstemmed |
The mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
title_sort |
mechanism behind internally generated centennial-to-millennial scale climate variability in an earth system model of intermediate complexity |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-3-377-2010 https://gmd.copernicus.org/articles/3/377/2010/ |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay Labrador Sea Nordic Seas North Atlantic Sea ice |
genre_facet |
Hudson Bay Labrador Sea Nordic Seas North Atlantic Sea ice |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-3-377-2010 https://gmd.copernicus.org/articles/3/377/2010/ |
op_doi |
https://doi.org/10.5194/gmd-3-377-2010 |
container_title |
Geoscientific Model Development |
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3 |
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2 |
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377 |
op_container_end_page |
389 |
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1766025560388009984 |