Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic
The densest waters in the deep limb of the Atlantic meridional overturning circulation (AMOC) consist of overflow waters from the Nordic Seas: Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW). These overflow waters are then substantially modified along their pathways b...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017402 2023-08-20T04:06:07+02:00 Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic Worthington, E. Johns, W. Bower, A. de Jong, F. Karstensen, J. Pickart, R. Dilmahamod, F. Fried, N. Koman, G. Pacini, A. Hiang, J. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1233 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1233 2023-07-30T23:40:44Z The densest waters in the deep limb of the Atlantic meridional overturning circulation (AMOC) consist of overflow waters from the Nordic Seas: Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW). These overflow waters are then substantially modified along their pathways by the entrainment of overlying intermediate waters and are eventually exported from the sub-polar gyre as Lower North Atlantic Deep Water. Since 2014, the OSNAP array has provided new insights into the sub-polar overturning circulation, including key boundary current arrays deployed across the Reykjanes Ridge, off East and West Greenland, and along the western side of the Labrador Sea. Here, using the OSNAP array data between 2014 and 2020, we quantify the mean transports of overflow waters along the deep boundary pathways, as well as recirculation within the Labrador Sea and Irminger Basin. Changes in the water properties of ISOW and DSOW as they advect around the deep subpolar gyre are also assessed. We further examine the traditional use of potential density of 27.88 kg/m 3 as the interface between ISOW and DSOW, and assess whether water mass boundary definitions need to change with increasing distance and entrainment along the deep circulation pathways. Conference Object Denmark Strait Greenland Iceland Labrador Sea Nordic Seas North Atlantic Deep Water North Atlantic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The densest waters in the deep limb of the Atlantic meridional overturning circulation (AMOC) consist of overflow waters from the Nordic Seas: Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW). These overflow waters are then substantially modified along their pathways by the entrainment of overlying intermediate waters and are eventually exported from the sub-polar gyre as Lower North Atlantic Deep Water. Since 2014, the OSNAP array has provided new insights into the sub-polar overturning circulation, including key boundary current arrays deployed across the Reykjanes Ridge, off East and West Greenland, and along the western side of the Labrador Sea. Here, using the OSNAP array data between 2014 and 2020, we quantify the mean transports of overflow waters along the deep boundary pathways, as well as recirculation within the Labrador Sea and Irminger Basin. Changes in the water properties of ISOW and DSOW as they advect around the deep subpolar gyre are also assessed. We further examine the traditional use of potential density of 27.88 kg/m 3 as the interface between ISOW and DSOW, and assess whether water mass boundary definitions need to change with increasing distance and entrainment along the deep circulation pathways. |
format |
Conference Object |
author |
Worthington, E. Johns, W. Bower, A. de Jong, F. Karstensen, J. Pickart, R. Dilmahamod, F. Fried, N. Koman, G. Pacini, A. Hiang, J. |
spellingShingle |
Worthington, E. Johns, W. Bower, A. de Jong, F. Karstensen, J. Pickart, R. Dilmahamod, F. Fried, N. Koman, G. Pacini, A. Hiang, J. Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
author_facet |
Worthington, E. Johns, W. Bower, A. de Jong, F. Karstensen, J. Pickart, R. Dilmahamod, F. Fried, N. Koman, G. Pacini, A. Hiang, J. |
author_sort |
Worthington, E. |
title |
Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
title_short |
Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
title_full |
Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
title_fullStr |
Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
title_full_unstemmed |
Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic |
title_sort |
updating lower north atlantic deep water transports in the sub-polar north atlantic |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Irminger Basin Reykjanes |
geographic_facet |
Greenland Irminger Basin Reykjanes |
genre |
Denmark Strait Greenland Iceland Labrador Sea Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
Denmark Strait Greenland Iceland Labrador Sea Nordic Seas North Atlantic Deep Water North Atlantic |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1233 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402 |
op_doi |
https://doi.org/10.57757/IUGG23-1233 |
_version_ |
1774717054378573824 |