NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage
The absence of the Drake Passage (DP) gateway in coupled models generally leads to vigorous Antarctic bottom water (AABW) formation, Antarctic warming, and the absence of North Atlantic deep-water (NADW) formation. Here the authors show that this result depends critically on atmospheric moisture tra...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.684.3134 2023-05-15T13:39:33+02:00 NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage Willem P. Sijp Matthew H. England The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.3134 http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.3134 http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf text 2008 ftciteseerx 2016-01-08T18:02:50Z The absence of the Drake Passage (DP) gateway in coupled models generally leads to vigorous Antarctic bottom water (AABW) formation, Antarctic warming, and the absence of North Atlantic deep-water (NADW) formation. Here the authors show that this result depends critically on atmospheric moisture transport by midlatitude storms. The authors use coupled model simulations employing geometries different only at the location of DP to show that oceanic circulation similar to that of the present day is possible when DP is closed and atmospheric moisture transport values enhanced by SouthernOcean storm activity are used. In this case, no Antarctic warming occurs in conjunction with DP closure. The authors also find that the changes in poleward heat transport in response to the establishment of the Antarctic Circumpolar Current (ACC) are small. This result arises from enhanced atmospheric moisture transport at the midlatitudes of the Southern Hemisphere (SH), although the values used remain within a range appropriate to the present day. In contrast, homogeneous or (near) symmetric moisture diffusivity leads to strong SH sinking and the ab-sence of a stable Northern Hemisphere (NH) overturning state, a feature familiar from previous studies. The authors ’ results show that the formation of NADW, or its precursor, may have been possible before the opening of the DP at the Eocene/Oligocene boundary, and that its presence depends on an interplay between the existence of the DP gap and the hydrological cycle across the midlatitude storm tracks. 1. Text Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic Unknown Antarctic Drake Passage The Antarctic |
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English |
description |
The absence of the Drake Passage (DP) gateway in coupled models generally leads to vigorous Antarctic bottom water (AABW) formation, Antarctic warming, and the absence of North Atlantic deep-water (NADW) formation. Here the authors show that this result depends critically on atmospheric moisture transport by midlatitude storms. The authors use coupled model simulations employing geometries different only at the location of DP to show that oceanic circulation similar to that of the present day is possible when DP is closed and atmospheric moisture transport values enhanced by SouthernOcean storm activity are used. In this case, no Antarctic warming occurs in conjunction with DP closure. The authors also find that the changes in poleward heat transport in response to the establishment of the Antarctic Circumpolar Current (ACC) are small. This result arises from enhanced atmospheric moisture transport at the midlatitudes of the Southern Hemisphere (SH), although the values used remain within a range appropriate to the present day. In contrast, homogeneous or (near) symmetric moisture diffusivity leads to strong SH sinking and the ab-sence of a stable Northern Hemisphere (NH) overturning state, a feature familiar from previous studies. The authors ’ results show that the formation of NADW, or its precursor, may have been possible before the opening of the DP at the Eocene/Oligocene boundary, and that its presence depends on an interplay between the existence of the DP gap and the hydrological cycle across the midlatitude storm tracks. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Willem P. Sijp Matthew H. England |
spellingShingle |
Willem P. Sijp Matthew H. England NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
author_facet |
Willem P. Sijp Matthew H. England |
author_sort |
Willem P. Sijp |
title |
NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
title_short |
NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
title_full |
NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
title_fullStr |
NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
title_full_unstemmed |
NOTES AND CORRESPONDENCE Atmospheric Moisture Transport Moderates Climatic Response to the Opening of Drake Passage |
title_sort |
notes and correspondence atmospheric moisture transport moderates climatic response to the opening of drake passage |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.3134 http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf |
geographic |
Antarctic Drake Passage The Antarctic |
geographic_facet |
Antarctic Drake Passage The Antarctic |
genre |
Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic |
op_source |
http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.3134 http://web.science.unsw.edu.au/%7Ematthew/Sijp_England_DP3.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766120232582119424 |