Did North Atlantic overturning halt 17,000 years ago?
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 23 (2008): PA1101, doi:10.1029/2007PA001500. Models indicate that a complete...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3455 2023-05-15T17:27:04+02:00 Did North Atlantic overturning halt 17,000 years ago? Keigwin, Lloyd D. Boyle, Edward A. 2008-01-31 application/pdf https://hdl.handle.net/1912/3455 en_US eng American Geophysical Union https://doi.org/10.1029/2007PA001500 Paleoceanography 23 (2008): PA1101 https://hdl.handle.net/1912/3455 doi:10.1029/2007PA001500 Paleoceanography 23 (2008): PA1101 doi:10.1029/2007PA001500 North Atlantic Ocean Meridional overturning Heinrich event Article 2008 ftwhoas https://doi.org/10.1029/2007PA001500 2022-05-28T22:57:58Z Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 23 (2008): PA1101, doi:10.1029/2007PA001500. Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda Rise is evidence that this might have happened ∼17 ka during Heinrich event 1 (H1). However, new radiocarbon data from bivalves that lived at ∼4.6 km on the Bermuda Rise during H1 lead to a different conclusion. The bivalve data do indeed indicate ventilation of the deep western North Atlantic was suppressed during H1 but not as much as it was during the last glacial maximum. We propose that high diatom flux to the Bermuda Rise during H1 is at least in part responsible for increased 231Pa/230Th at that time. Although we cannot say for sure why opal production was so high in a gyre center location at that time, increased leakage of silica rich waters from the Southern Ocean to the North Atlantic is one possibility. This work was funded by a grant from the Comer Foundation to WHOI’s Ocean and Climate Change Institute. Article in Journal/Newspaper North Atlantic Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Southern Ocean Paleoceanography 23 1 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
North Atlantic Ocean Meridional overturning Heinrich event |
spellingShingle |
North Atlantic Ocean Meridional overturning Heinrich event Keigwin, Lloyd D. Boyle, Edward A. Did North Atlantic overturning halt 17,000 years ago? |
topic_facet |
North Atlantic Ocean Meridional overturning Heinrich event |
description |
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 23 (2008): PA1101, doi:10.1029/2007PA001500. Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda Rise is evidence that this might have happened ∼17 ka during Heinrich event 1 (H1). However, new radiocarbon data from bivalves that lived at ∼4.6 km on the Bermuda Rise during H1 lead to a different conclusion. The bivalve data do indeed indicate ventilation of the deep western North Atlantic was suppressed during H1 but not as much as it was during the last glacial maximum. We propose that high diatom flux to the Bermuda Rise during H1 is at least in part responsible for increased 231Pa/230Th at that time. Although we cannot say for sure why opal production was so high in a gyre center location at that time, increased leakage of silica rich waters from the Southern Ocean to the North Atlantic is one possibility. This work was funded by a grant from the Comer Foundation to WHOI’s Ocean and Climate Change Institute. |
format |
Article in Journal/Newspaper |
author |
Keigwin, Lloyd D. Boyle, Edward A. |
author_facet |
Keigwin, Lloyd D. Boyle, Edward A. |
author_sort |
Keigwin, Lloyd D. |
title |
Did North Atlantic overturning halt 17,000 years ago? |
title_short |
Did North Atlantic overturning halt 17,000 years ago? |
title_full |
Did North Atlantic overturning halt 17,000 years ago? |
title_fullStr |
Did North Atlantic overturning halt 17,000 years ago? |
title_full_unstemmed |
Did North Atlantic overturning halt 17,000 years ago? |
title_sort |
did north atlantic overturning halt 17,000 years ago? |
publisher |
American Geophysical Union |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/3455 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Paleoceanography 23 (2008): PA1101 doi:10.1029/2007PA001500 |
op_relation |
https://doi.org/10.1029/2007PA001500 Paleoceanography 23 (2008): PA1101 https://hdl.handle.net/1912/3455 doi:10.1029/2007PA001500 |
op_doi |
https://doi.org/10.1029/2007PA001500 |
container_title |
Paleoceanography |
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23 |
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1 |
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n/a |
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n/a |
_version_ |
1766118982690013184 |