Grain size analysis of ODP Site 162-984
Past changes in the freshwater balance of the surface North Atlantic Ocean are thought to have influenced the rate of deep-water formation, and consequently climate (Broecker and Denton, 1989, doi:10.1016/0016-7037(89)90123-3; Manabe and Stouffer, 1996; doi:10.1038/378165a0). Although water-mass pro...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.769648 2023-05-15T16:29:43+02:00 Grain size analysis of ODP Site 162-984 Praetorius, Summer K McManus, Jerry F Oppo, Delia W Curry, William B LATITUDE: 61.425317 * LONGITUDE: -24.082417 * DATE/TIME START: 1995-07-24T00:00:00 * DATE/TIME END: 1995-07-29T00:00:00 2008-09-06 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.769648 https://doi.org/10.1594/PANGAEA.769648 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.769648 https://doi.org/10.1594/PANGAEA.769648 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Praetorius, Summer K; McManus, Jerry F; Oppo, Delia W; Curry, William B (2008): Episodic reductions in bottom-water currents since the last ice age. Nature Geoscience, 1, 449-452, https://doi.org/10.1038/ngeo227 162-984 COMPCORE Composite Core Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.769648 https://doi.org/10.1038/ngeo227 2023-01-20T07:32:18Z Past changes in the freshwater balance of the surface North Atlantic Ocean are thought to have influenced the rate of deep-water formation, and consequently climate (Broecker and Denton, 1989, doi:10.1016/0016-7037(89)90123-3; Manabe and Stouffer, 1996; doi:10.1038/378165a0). Although water-mass proxies are generally consistent with an impact of freshwater input on meridional overturning circulation (Boyle and Keigwin, 1987, doi:10.1038/330035a0), there has been little dynamic evidence to support this linkage. Here we present a 25,000 year record of variations in sediment grain size from south of Iceland, which indicates vigorous bottom-water currents during both the last glacial maximum and the Holocene period. Together with reconstructions of North Atlantic water-mass distribution, vigorous bottom currents suggest a shorter residence time of northern-source waters during the last glacial maximum, relative to the Holocene period. The most significant reductions in flow strength occur during periods that have been associated with freshening of the surface North Atlantic. The short-term deglacial oscillations in bottom current strength are closely coupled to changes in Greenland air temperature, with a minimum during the Younger Dryas cold reversal and a maximum at the time of rapid warming at the onset of the Holocene. Our results support a strong connection between ocean circulation and rapid climate change. Dataset Greenland Iceland North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(-24.082417,-24.082417,61.425317,61.425317) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
162-984 COMPCORE Composite Core Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
162-984 COMPCORE Composite Core Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP Praetorius, Summer K McManus, Jerry F Oppo, Delia W Curry, William B Grain size analysis of ODP Site 162-984 |
topic_facet |
162-984 COMPCORE Composite Core Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Past changes in the freshwater balance of the surface North Atlantic Ocean are thought to have influenced the rate of deep-water formation, and consequently climate (Broecker and Denton, 1989, doi:10.1016/0016-7037(89)90123-3; Manabe and Stouffer, 1996; doi:10.1038/378165a0). Although water-mass proxies are generally consistent with an impact of freshwater input on meridional overturning circulation (Boyle and Keigwin, 1987, doi:10.1038/330035a0), there has been little dynamic evidence to support this linkage. Here we present a 25,000 year record of variations in sediment grain size from south of Iceland, which indicates vigorous bottom-water currents during both the last glacial maximum and the Holocene period. Together with reconstructions of North Atlantic water-mass distribution, vigorous bottom currents suggest a shorter residence time of northern-source waters during the last glacial maximum, relative to the Holocene period. The most significant reductions in flow strength occur during periods that have been associated with freshening of the surface North Atlantic. The short-term deglacial oscillations in bottom current strength are closely coupled to changes in Greenland air temperature, with a minimum during the Younger Dryas cold reversal and a maximum at the time of rapid warming at the onset of the Holocene. Our results support a strong connection between ocean circulation and rapid climate change. |
format |
Dataset |
author |
Praetorius, Summer K McManus, Jerry F Oppo, Delia W Curry, William B |
author_facet |
Praetorius, Summer K McManus, Jerry F Oppo, Delia W Curry, William B |
author_sort |
Praetorius, Summer K |
title |
Grain size analysis of ODP Site 162-984 |
title_short |
Grain size analysis of ODP Site 162-984 |
title_full |
Grain size analysis of ODP Site 162-984 |
title_fullStr |
Grain size analysis of ODP Site 162-984 |
title_full_unstemmed |
Grain size analysis of ODP Site 162-984 |
title_sort |
grain size analysis of odp site 162-984 |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.769648 https://doi.org/10.1594/PANGAEA.769648 |
op_coverage |
LATITUDE: 61.425317 * LONGITUDE: -24.082417 * DATE/TIME START: 1995-07-24T00:00:00 * DATE/TIME END: 1995-07-29T00:00:00 |
long_lat |
ENVELOPE(-24.082417,-24.082417,61.425317,61.425317) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_source |
Supplement to: Praetorius, Summer K; McManus, Jerry F; Oppo, Delia W; Curry, William B (2008): Episodic reductions in bottom-water currents since the last ice age. Nature Geoscience, 1, 449-452, https://doi.org/10.1038/ngeo227 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.769648 https://doi.org/10.1594/PANGAEA.769648 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.769648 https://doi.org/10.1038/ngeo227 |
_version_ |
1766019420307587072 |