Twisted Transformation - circulation and interaction of water masses in the Weddell Sea
The Antarctic Bottom Water (AABW), which ventilates most of the deepest basins of the world ocean, has shown widespread warming in recent decades that contributes inter alia to the global thermosteric sea level rise. More than half of the AABW is supplied by outflow from the Weddell Sea where it att...
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ftawi:oai:epic.awi.de:41644 2024-09-15T17:44:36+00:00 Twisted Transformation - circulation and interaction of water masses in the Weddell Sea Strass, Volker Rohardt, Gerd Reeve, Krissy Boebel, Olaf Kanzow, Torsten 2016 application/pdf https://epic.awi.de/id/eprint/41644/ https://epic.awi.de/id/eprint/41644/1/SCAR2016_S03_274_StrassEtAl_ePIC.pdf https://hdl.handle.net/10013/epic.48523 https://hdl.handle.net/10013/epic.48523.d001 unknown https://epic.awi.de/id/eprint/41644/1/SCAR2016_S03_274_StrassEtAl_ePIC.pdf https://hdl.handle.net/10013/epic.48523.d001 Strass, V. orcid:0000-0002-7539-1400 , Rohardt, G. orcid:0000-0003-0479-7638 , Reeve, K. , Boebel, O. orcid:0000-0002-2259-0035 and Kanzow, T. , (1) Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), (2) Balearic Islands Coastal Ocean Observing and Forecast System (SOCIB) (2016) Twisted Transformation - circulation and interaction of water masses in the Weddell Sea , SCAR Open Science Conference, Kuala Lumpur, Malaysia, 20 August 2016 - 30 August 2016 . hdl:10013/epic.48523 EPIC3SCAR Open Science Conference, Kuala Lumpur, Malaysia, 2016-08-20-2016-08-30 Conference notRev 2016 ftawi 2024-06-24T04:15:36Z The Antarctic Bottom Water (AABW), which ventilates most of the deepest basins of the world ocean, has shown widespread warming in recent decades that contributes inter alia to the global thermosteric sea level rise. More than half of the AABW is supplied by outflow from the Weddell Sea where it attains its characteristics, in particular its high density, by heat loss of its source water masses to the atmosphere and to the fringing ice shelves and by influx of locally formed water masses such as the high-salinity shelf water shaped by brine release from freezing sea ice. Dense shelf waters cascade down the continental slope along the southern and western rim of the Weddell Sea, mix with the modified source waters and thus replenish the Weddell Sea Bottom (WSBW) and Deep Water (WSDW), precursor of the AABW. The major source water mass, hence conduit of heat for the interior Weddell Sea, is the Circumpolar Deep Water (CDW) advected from the Antarctic Circumpolar Current (ACC) with the southward oriented eastern limb of the Weddell Gyre. During its advection, the CDW is sucked upward by divergence in the large-scale mean wind-field to about 200 m in the central Weddell Sea, where it is termed Warm Deep Water (WDW). Progress in the understanding of this twisted transformation of water masses is obtained from a combination of three different observational approaches. First, a gridded data set of upper-ocean hydrographic properties in the Weddell Gyre derived by objective mapping of under-ice Argo float profiles; this data set reveals for instance the WDW inflow, its transport with the Weddell Gyre, and the erosion of its core thermohaline properties during circulation. Second, multi-annual time series obtained from repeat deep CTD stations, which demonstrate a significant, approximate linear warming trend in the Weddell Sea deep water masses below 700 m depth of roughly 2 mK per annum during the past 25 years. Third, long-term mooring records of velocity and temperature in the Weddell outflow regime on the ... Conference Object Antarc* Antarctic Ice Shelves Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Antarctic Bottom Water (AABW), which ventilates most of the deepest basins of the world ocean, has shown widespread warming in recent decades that contributes inter alia to the global thermosteric sea level rise. More than half of the AABW is supplied by outflow from the Weddell Sea where it attains its characteristics, in particular its high density, by heat loss of its source water masses to the atmosphere and to the fringing ice shelves and by influx of locally formed water masses such as the high-salinity shelf water shaped by brine release from freezing sea ice. Dense shelf waters cascade down the continental slope along the southern and western rim of the Weddell Sea, mix with the modified source waters and thus replenish the Weddell Sea Bottom (WSBW) and Deep Water (WSDW), precursor of the AABW. The major source water mass, hence conduit of heat for the interior Weddell Sea, is the Circumpolar Deep Water (CDW) advected from the Antarctic Circumpolar Current (ACC) with the southward oriented eastern limb of the Weddell Gyre. During its advection, the CDW is sucked upward by divergence in the large-scale mean wind-field to about 200 m in the central Weddell Sea, where it is termed Warm Deep Water (WDW). Progress in the understanding of this twisted transformation of water masses is obtained from a combination of three different observational approaches. First, a gridded data set of upper-ocean hydrographic properties in the Weddell Gyre derived by objective mapping of under-ice Argo float profiles; this data set reveals for instance the WDW inflow, its transport with the Weddell Gyre, and the erosion of its core thermohaline properties during circulation. Second, multi-annual time series obtained from repeat deep CTD stations, which demonstrate a significant, approximate linear warming trend in the Weddell Sea deep water masses below 700 m depth of roughly 2 mK per annum during the past 25 years. Third, long-term mooring records of velocity and temperature in the Weddell outflow regime on the ... |
format |
Conference Object |
author |
Strass, Volker Rohardt, Gerd Reeve, Krissy Boebel, Olaf Kanzow, Torsten |
spellingShingle |
Strass, Volker Rohardt, Gerd Reeve, Krissy Boebel, Olaf Kanzow, Torsten Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
author_facet |
Strass, Volker Rohardt, Gerd Reeve, Krissy Boebel, Olaf Kanzow, Torsten |
author_sort |
Strass, Volker |
title |
Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
title_short |
Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
title_full |
Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
title_fullStr |
Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
title_full_unstemmed |
Twisted Transformation - circulation and interaction of water masses in the Weddell Sea |
title_sort |
twisted transformation - circulation and interaction of water masses in the weddell sea |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41644/ https://epic.awi.de/id/eprint/41644/1/SCAR2016_S03_274_StrassEtAl_ePIC.pdf https://hdl.handle.net/10013/epic.48523 https://hdl.handle.net/10013/epic.48523.d001 |
genre |
Antarc* Antarctic Ice Shelves Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelves Sea ice Weddell Sea |
op_source |
EPIC3SCAR Open Science Conference, Kuala Lumpur, Malaysia, 2016-08-20-2016-08-30 |
op_relation |
https://epic.awi.de/id/eprint/41644/1/SCAR2016_S03_274_StrassEtAl_ePIC.pdf https://hdl.handle.net/10013/epic.48523.d001 Strass, V. orcid:0000-0002-7539-1400 , Rohardt, G. orcid:0000-0003-0479-7638 , Reeve, K. , Boebel, O. orcid:0000-0002-2259-0035 and Kanzow, T. , (1) Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), (2) Balearic Islands Coastal Ocean Observing and Forecast System (SOCIB) (2016) Twisted Transformation - circulation and interaction of water masses in the Weddell Sea , SCAR Open Science Conference, Kuala Lumpur, Malaysia, 20 August 2016 - 30 August 2016 . hdl:10013/epic.48523 |
_version_ |
1810492253544644608 |