A subtropical fate awaited freshwater discharged from glacial
[1] The 8.2 kyr event is the largest abrupt climatic change recorded in the last 10,000 years, and is widely hypothesized to have been triggered by the release of thousands of kilometers cubed of freshwater into the North Atlantic Ocean. Using a high‐resolution (1/6°) global, ocean‐ice circulation m...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.211.235 2023-05-15T13:40:41+02:00 A subtropical fate awaited freshwater discharged from glacial Lake Agassiz Alan Condron Peter Winsor The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.235 http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.235 http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf text ftciteseerx 2016-01-07T17:52:04Z [1] The 8.2 kyr event is the largest abrupt climatic change recorded in the last 10,000 years, and is widely hypothesized to have been triggered by the release of thousands of kilometers cubed of freshwater into the North Atlantic Ocean. Using a high‐resolution (1/6°) global, ocean‐ice circulation model we present an alternative view that freshwater discharged from glacial Lake Agassiz would have remained on the continental shelf as a narrow, buoyant, coastal current, and would have been transported south into the subtropical North Atlantic. The pathway we describe is in contrast to the conceptual idea that freshwater from this lake outburst spread over most of the sub‐polar North Atlantic, and covered the deep, open‐ocean, convection regions. This coastally confined freshwater pathway is consistent with the present‐day routing of freshwater from Hudson Bay, as well as paleoceanographic evidence of this event. Using a coarse‐resolution (2.6°) version of the same model, we demonstrate that the previously reported spreading of freshwater across the sub‐polar North Atlantic results from the inability of numerical models of this resolution to accurately resolve narrow coastal flows, producing instead a diffuse circulation that advects freshwater away from the boundaries. To understand the climatic impact of freshwater released in the past or future (e.g. Greenland and Antarctica), the ocean needs to be modeled at a resolution sufficient to resolve the dynamics of narrow, coastal buoyant flows. Text Antarc* Antarctica Greenland Hudson Bay North Atlantic Unknown Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Greenland Hudson Hudson Bay |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
[1] The 8.2 kyr event is the largest abrupt climatic change recorded in the last 10,000 years, and is widely hypothesized to have been triggered by the release of thousands of kilometers cubed of freshwater into the North Atlantic Ocean. Using a high‐resolution (1/6°) global, ocean‐ice circulation model we present an alternative view that freshwater discharged from glacial Lake Agassiz would have remained on the continental shelf as a narrow, buoyant, coastal current, and would have been transported south into the subtropical North Atlantic. The pathway we describe is in contrast to the conceptual idea that freshwater from this lake outburst spread over most of the sub‐polar North Atlantic, and covered the deep, open‐ocean, convection regions. This coastally confined freshwater pathway is consistent with the present‐day routing of freshwater from Hudson Bay, as well as paleoceanographic evidence of this event. Using a coarse‐resolution (2.6°) version of the same model, we demonstrate that the previously reported spreading of freshwater across the sub‐polar North Atlantic results from the inability of numerical models of this resolution to accurately resolve narrow coastal flows, producing instead a diffuse circulation that advects freshwater away from the boundaries. To understand the climatic impact of freshwater released in the past or future (e.g. Greenland and Antarctica), the ocean needs to be modeled at a resolution sufficient to resolve the dynamics of narrow, coastal buoyant flows. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Lake Agassiz Alan Condron Peter Winsor |
spellingShingle |
Lake Agassiz Alan Condron Peter Winsor A subtropical fate awaited freshwater discharged from glacial |
author_facet |
Lake Agassiz Alan Condron Peter Winsor |
author_sort |
Lake Agassiz |
title |
A subtropical fate awaited freshwater discharged from glacial |
title_short |
A subtropical fate awaited freshwater discharged from glacial |
title_full |
A subtropical fate awaited freshwater discharged from glacial |
title_fullStr |
A subtropical fate awaited freshwater discharged from glacial |
title_full_unstemmed |
A subtropical fate awaited freshwater discharged from glacial |
title_sort |
subtropical fate awaited freshwater discharged from glacial |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.235 http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake Greenland Hudson Hudson Bay |
geographic_facet |
Glacial Lake Greenland Hudson Hudson Bay |
genre |
Antarc* Antarctica Greenland Hudson Bay North Atlantic |
genre_facet |
Antarc* Antarctica Greenland Hudson Bay North Atlantic |
op_source |
http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.235 http://www.geo.umass.edu/climate/papers2/Condron_GRL_2011.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766138442280861696 |