A Tropical Mechanism for Northern Hemisphere Deglaciation
We investigate the role of the tropics in the melting and reforming of the Laurentide ice sheet on glacial timescales using an atmospheric general circulation model. It is found that warming of tropical sea surface temperatures (SST) from glacial boundary conditions, as observed at the end of glacia...
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ftawi:oai:epic.awi.de:11057 2023-09-05T13:20:16+02:00 A Tropical Mechanism for Northern Hemisphere Deglaciation Rodgers, K. Lohmann, Gerrit Lorenz, S. Schneider, Robert Henderson, G. 2003 application/pdf https://epic.awi.de/id/eprint/11057/ https://epic.awi.de/id/eprint/11057/1/Rod2003b.pdf https://doi.org/10.1029/2003GC0000508 https://hdl.handle.net/10013/epic.21517 https://hdl.handle.net/10013/epic.21517.d001 unknown https://epic.awi.de/id/eprint/11057/1/Rod2003b.pdf https://hdl.handle.net/10013/epic.21517.d001 Rodgers, K. , Lohmann, G. orcid:0000-0003-2089-733X , Lorenz, S. , Schneider, R. and Henderson, G. (2003) A Tropical Mechanism for Northern Hemisphere Deglaciation , Geochem., Geophys., Geosyst, 4 (5) . doi:10.1029/2003GC0000508 <https://doi.org/10.1029/2003GC0000508> , hdl:10013/epic.21517 EPIC3Geochem., Geophys., Geosyst, 4(5), 1046 p. Article isiRev 2003 ftawi https://doi.org/10.1029/2003GC0000508 2023-08-22T19:49:05Z We investigate the role of the tropics in the melting and reforming of the Laurentide ice sheet on glacial timescales using an atmospheric general circulation model. It is found that warming of tropical sea surface temperatures (SST) from glacial boundary conditions, as observed at the end of glacial periods [Bard et al., 1997 (Somali Basin records); Lea et al., 2000; Nürnberg et al., 2000; Seltzer et al., 2002], causes a large increase in summer temperatures centered over the ice-sheet-forming regions of Canada. This high latitude response to tropical change is due to relatively small changes in the circulation of the extratropical atmosphere which lead to changes in the vertical profiles of temperature and moisture in the extratropical atmosphere. These changes via an atmospheric bridge between the tropics and extratropics represent a mechanism for deglaciations which is consistent with timing constraints. In contrast, a cold perturbation to tropical SST for interglacial boundary conditions results in very little change in circulation and almost no cooling over the Canadian region. This implies that tropical SSTs could play a more important role in melting ice sheets in the northern hemisphere than in reforming them, possibly providing a mechanism which could help to explain the relative rapidity of deglaciation. Article in Journal/Newspaper Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Canada |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
We investigate the role of the tropics in the melting and reforming of the Laurentide ice sheet on glacial timescales using an atmospheric general circulation model. It is found that warming of tropical sea surface temperatures (SST) from glacial boundary conditions, as observed at the end of glacial periods [Bard et al., 1997 (Somali Basin records); Lea et al., 2000; Nürnberg et al., 2000; Seltzer et al., 2002], causes a large increase in summer temperatures centered over the ice-sheet-forming regions of Canada. This high latitude response to tropical change is due to relatively small changes in the circulation of the extratropical atmosphere which lead to changes in the vertical profiles of temperature and moisture in the extratropical atmosphere. These changes via an atmospheric bridge between the tropics and extratropics represent a mechanism for deglaciations which is consistent with timing constraints. In contrast, a cold perturbation to tropical SST for interglacial boundary conditions results in very little change in circulation and almost no cooling over the Canadian region. This implies that tropical SSTs could play a more important role in melting ice sheets in the northern hemisphere than in reforming them, possibly providing a mechanism which could help to explain the relative rapidity of deglaciation. |
format |
Article in Journal/Newspaper |
author |
Rodgers, K. Lohmann, Gerrit Lorenz, S. Schneider, Robert Henderson, G. |
spellingShingle |
Rodgers, K. Lohmann, Gerrit Lorenz, S. Schneider, Robert Henderson, G. A Tropical Mechanism for Northern Hemisphere Deglaciation |
author_facet |
Rodgers, K. Lohmann, Gerrit Lorenz, S. Schneider, Robert Henderson, G. |
author_sort |
Rodgers, K. |
title |
A Tropical Mechanism for Northern Hemisphere Deglaciation |
title_short |
A Tropical Mechanism for Northern Hemisphere Deglaciation |
title_full |
A Tropical Mechanism for Northern Hemisphere Deglaciation |
title_fullStr |
A Tropical Mechanism for Northern Hemisphere Deglaciation |
title_full_unstemmed |
A Tropical Mechanism for Northern Hemisphere Deglaciation |
title_sort |
tropical mechanism for northern hemisphere deglaciation |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/11057/ https://epic.awi.de/id/eprint/11057/1/Rod2003b.pdf https://doi.org/10.1029/2003GC0000508 https://hdl.handle.net/10013/epic.21517 https://hdl.handle.net/10013/epic.21517.d001 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
EPIC3Geochem., Geophys., Geosyst, 4(5), 1046 p. |
op_relation |
https://epic.awi.de/id/eprint/11057/1/Rod2003b.pdf https://hdl.handle.net/10013/epic.21517.d001 Rodgers, K. , Lohmann, G. orcid:0000-0003-2089-733X , Lorenz, S. , Schneider, R. and Henderson, G. (2003) A Tropical Mechanism for Northern Hemisphere Deglaciation , Geochem., Geophys., Geosyst, 4 (5) . doi:10.1029/2003GC0000508 <https://doi.org/10.1029/2003GC0000508> , hdl:10013/epic.21517 |
op_doi |
https://doi.org/10.1029/2003GC0000508 |
_version_ |
1776200972656181248 |