Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation
Climate fluctuations during the last deglaciation have been linked to changes in the North Atlantic Meridional Overturning Circulation (MOC) through its modulation of northward marine heat transport. Consequently, much research into the causes of rapid climate change has focused on the northern Nort...
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/30490/ https://doi.org/10.1016/j.gloplacha.2010.12.001 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:30490 2023-05-15T17:25:26+02:00 Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation Hall, Ian Robert Evans, Helena Kay Thornalley, David J. R. 2011 https://orca.cardiff.ac.uk/id/eprint/30490/ https://doi.org/10.1016/j.gloplacha.2010.12.001 unknown Elsevier Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419, Evans, Helena Kay https://orca.cardiff.ac.uk/view/cardiffauthors/A0643287.html and Thornalley, David J. R. https://orca.cardiff.ac.uk/view/cardiffauthors/A131861Z.html 2011. Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation. Global and Planetary Change 79 (3-4) , pp. 255-263. 10.1016/j.gloplacha.2010.12.001 https://doi.org/10.1016/j.gloplacha.2010.12.001 doi:10.1016/j.gloplacha.2010.12.001 GC Oceanography Article PeerReviewed 2011 ftunivcardiff https://doi.org/10.1016/j.gloplacha.2010.12.001 2022-11-10T23:32:18Z Climate fluctuations during the last deglaciation have been linked to changes in the North Atlantic Meridional Overturning Circulation (MOC) through its modulation of northward marine heat transport. Consequently, much research into the causes of rapid climate change has focused on the northern North Atlantic as a key component of global ocean circulation. The production of cold, deep waters in the Southern Ocean is an important factor in the Earth's heat budget, but the involvement of deep Southern Sourced Water (SSW) in deglacial climate change has yet to be fully established. Here we use terrigenous silt grain size data from two ocean sediment cores retrieved from the western subtropical North Atlantic to reconstruct past changes in the speed of deepwater flow. The first core site is located under the influence of Lower North Atlantic Deep Water (LNADW), and is representative of changes in the MOC. The second core site is close to the modern boundary between LNADW/SSW and is therefore ideally positioned to detect changes in SSW delivery to the North Atlantic. We find evidence for a broad-scale difference in flow speed changes at the two sites, with the presence of a vigorous, but poorly ventilated SSW mass at ~ 4200 m water depth during the cold episodes of the last deglaciation when shallower (2975 m water depth) grain size and geochemical data suggest that Northern Sourced Water (NSW) was suppressed. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Southern Ocean Cardiff University: ORCA (Online Research @ Cardiff) Southern Ocean Global and Planetary Change 79 3-4 255 263 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
GC Oceanography |
spellingShingle |
GC Oceanography Hall, Ian Robert Evans, Helena Kay Thornalley, David J. R. Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
topic_facet |
GC Oceanography |
description |
Climate fluctuations during the last deglaciation have been linked to changes in the North Atlantic Meridional Overturning Circulation (MOC) through its modulation of northward marine heat transport. Consequently, much research into the causes of rapid climate change has focused on the northern North Atlantic as a key component of global ocean circulation. The production of cold, deep waters in the Southern Ocean is an important factor in the Earth's heat budget, but the involvement of deep Southern Sourced Water (SSW) in deglacial climate change has yet to be fully established. Here we use terrigenous silt grain size data from two ocean sediment cores retrieved from the western subtropical North Atlantic to reconstruct past changes in the speed of deepwater flow. The first core site is located under the influence of Lower North Atlantic Deep Water (LNADW), and is representative of changes in the MOC. The second core site is close to the modern boundary between LNADW/SSW and is therefore ideally positioned to detect changes in SSW delivery to the North Atlantic. We find evidence for a broad-scale difference in flow speed changes at the two sites, with the presence of a vigorous, but poorly ventilated SSW mass at ~ 4200 m water depth during the cold episodes of the last deglaciation when shallower (2975 m water depth) grain size and geochemical data suggest that Northern Sourced Water (NSW) was suppressed. |
format |
Article in Journal/Newspaper |
author |
Hall, Ian Robert Evans, Helena Kay Thornalley, David J. R. |
author_facet |
Hall, Ian Robert Evans, Helena Kay Thornalley, David J. R. |
author_sort |
Hall, Ian Robert |
title |
Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
title_short |
Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
title_full |
Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
title_fullStr |
Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
title_full_unstemmed |
Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation |
title_sort |
deep water flow speed and surface ocean changes in the subtropical north atlantic during the last deglaciation |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://orca.cardiff.ac.uk/id/eprint/30490/ https://doi.org/10.1016/j.gloplacha.2010.12.001 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic Southern Ocean |
op_relation |
Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419, Evans, Helena Kay https://orca.cardiff.ac.uk/view/cardiffauthors/A0643287.html and Thornalley, David J. R. https://orca.cardiff.ac.uk/view/cardiffauthors/A131861Z.html 2011. Deep water flow speed and surface ocean changes in the subtropical North Atlantic during the last deglaciation. Global and Planetary Change 79 (3-4) , pp. 255-263. 10.1016/j.gloplacha.2010.12.001 https://doi.org/10.1016/j.gloplacha.2010.12.001 doi:10.1016/j.gloplacha.2010.12.001 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2010.12.001 |
container_title |
Global and Planetary Change |
container_volume |
79 |
container_issue |
3-4 |
container_start_page |
255 |
op_container_end_page |
263 |
_version_ |
1766116866731802624 |