Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica
Around most of Antarctica, the Circumpolar Deep Water (CDW) shows a warming trend. At the same time, the thermocline is shoaling, thereby increasing the potential for CDW to enter the shallow continental shelves and ultimately increase basal melt in the ice shelf cavities that line the coast. Simila...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00064219 2023-05-15T13:49:22+02:00 Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica Darelius, Elin Dundas, Vår Janout, Markus Tippenhauer, Sandra 2023-01 electronic https://doi.org/10.5194/egusphere-2022-1477 https://noa.gwlb.de/receive/cop_mods_00064219 https://egusphere.copernicus.org/preprints/egusphere-2022-1477/egusphere-2022-1477.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-1477 https://noa.gwlb.de/receive/cop_mods_00064219 https://egusphere.copernicus.org/preprints/egusphere-2022-1477/egusphere-2022-1477.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-1477 2023-01-09T00:13:12Z Around most of Antarctica, the Circumpolar Deep Water (CDW) shows a warming trend. At the same time, the thermocline is shoaling, thereby increasing the potential for CDW to enter the shallow continental shelves and ultimately increase basal melt in the ice shelf cavities that line the coast. Similar trends, on the order of 0.05 °C and 30 m per decade, have been observed in the Warm Deep Water (WDW), the slightly cooled CDW derivative found at depth in the Weddell Sea. Here we report on a sudden, local increase in the temperature maximum of the WDW above the continental slope north of the Filchner Trough (25–40° W), a region identified as a hotspot for potential changes in the flow of WDW towards the large Filchner-Ronne Ice Shelf. A combination of new and historical Conductivity-Temperature-Depth profiles and mooring records show that, starting in late 2019, the temperature of the warm water core increased by about 0.1 °C over the upper part of the slope (700–2750 m depth). The increased temperature of the WDW is accompanied by an unprecedented (in observations) freshening of about 0.1 g kg-1 in the overlying Winter Water. Mooring records from the continental shelf further south, in the inflow pathway, do not show increased temperatures during the same period, suggesting that factors other than the WDW core temperature over the slope determine the variability in the heat content on the shelf. Article in Journal/Newspaper Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea Niedersächsisches Online-Archiv NOA Filchner Trough ENVELOPE(-36.000,-36.000,-77.000,-77.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Weddell Weddell Sea |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Darelius, Elin Dundas, Vår Janout, Markus Tippenhauer, Sandra Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Around most of Antarctica, the Circumpolar Deep Water (CDW) shows a warming trend. At the same time, the thermocline is shoaling, thereby increasing the potential for CDW to enter the shallow continental shelves and ultimately increase basal melt in the ice shelf cavities that line the coast. Similar trends, on the order of 0.05 °C and 30 m per decade, have been observed in the Warm Deep Water (WDW), the slightly cooled CDW derivative found at depth in the Weddell Sea. Here we report on a sudden, local increase in the temperature maximum of the WDW above the continental slope north of the Filchner Trough (25–40° W), a region identified as a hotspot for potential changes in the flow of WDW towards the large Filchner-Ronne Ice Shelf. A combination of new and historical Conductivity-Temperature-Depth profiles and mooring records show that, starting in late 2019, the temperature of the warm water core increased by about 0.1 °C over the upper part of the slope (700–2750 m depth). The increased temperature of the WDW is accompanied by an unprecedented (in observations) freshening of about 0.1 g kg-1 in the overlying Winter Water. Mooring records from the continental shelf further south, in the inflow pathway, do not show increased temperatures during the same period, suggesting that factors other than the WDW core temperature over the slope determine the variability in the heat content on the shelf. |
format |
Article in Journal/Newspaper |
author |
Darelius, Elin Dundas, Vår Janout, Markus Tippenhauer, Sandra |
author_facet |
Darelius, Elin Dundas, Vår Janout, Markus Tippenhauer, Sandra |
author_sort |
Darelius, Elin |
title |
Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
title_short |
Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
title_full |
Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
title_fullStr |
Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
title_full_unstemmed |
Sudden, local temperature increase above the continental slope in the Southern Weddell Sea, Antarctica |
title_sort |
sudden, local temperature increase above the continental slope in the southern weddell sea, antarctica |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-1477 https://noa.gwlb.de/receive/cop_mods_00064219 https://egusphere.copernicus.org/preprints/egusphere-2022-1477/egusphere-2022-1477.pdf |
long_lat |
ENVELOPE(-36.000,-36.000,-77.000,-77.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Filchner Trough Ronne Ice Shelf Weddell Weddell Sea |
geographic_facet |
Filchner Trough Ronne Ice Shelf Weddell Weddell Sea |
genre |
Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
op_relation |
https://doi.org/10.5194/egusphere-2022-1477 https://noa.gwlb.de/receive/cop_mods_00064219 https://egusphere.copernicus.org/preprints/egusphere-2022-1477/egusphere-2022-1477.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-1477 |
_version_ |
1766251250494472192 |