Thickness of the Berkner Island fast-ice tongue: Implications for ISW
Landfast sea ice (fast ice) attached to the Antarctic coast is a key component of the regional atmosphere-ice-ocean- and eco-systems. Through its direct coupling with the atmosphere and ocean, changes of fast ice and its snow cover are also potential indicators of climate change. Some Antarctic fast...
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ftawi:oai:epic.awi.de:52679 2023-05-15T13:45:22+02:00 Thickness of the Berkner Island fast-ice tongue: Implications for ISW Arndt, Stefanie Haas, Christian 2019 https://epic.awi.de/id/eprint/52679/ https://hdl.handle.net/10013/epic.e836ace0-4698-4199-81df-f0ea57ec5a1c unknown Arndt, S. orcid:0000-0001-9782-3844 and Haas, C. orcid:0000-0002-7674-3500 (2019) Thickness of the Berkner Island fast-ice tongue: Implications for ISW , FRISP 2019, Oxford, UK, 15 September 2019 - 18 September 2019 . hdl:10013/epic.e836ace0-4698-4199-81df-f0ea57ec5a1c EPIC3FRISP 2019, Oxford, UK, 2019-09-15-2019-09-18 Conference notRev 2019 ftawi 2021-12-24T15:45:47Z Landfast sea ice (fast ice) attached to the Antarctic coast is a key component of the regional atmosphere-ice-ocean- and eco-systems. Through its direct coupling with the atmosphere and ocean, changes of fast ice and its snow cover are also potential indicators of climate change. Some Antarctic fast ice survives several summers and, therefore, contributes to reductions of iceberg calving and stabilization of glaciers. Also, large amounts of platelet ice can accumulate under fast ice, indicating the presence of Ice Shelf Water (ISW) and therefore of nearby ice shelf bottom melt. During the R/V Polarstern expedition FROST (Filchner Ronne Outflow System Tomorrow, PS111) in February 2018 to the southern Weddell Sea we investigated the thickness of the Berkner Island fast-ice tongue and the platelet ice accumulation beneath. We carried out five helicopter electromagnetic induction (HEM) surveys to measure sea-ice and sub-ice platelet layer thicknesses of this prominent fast ice region off the Filcher and Ronne Ice Shelves. Results showed that the Berkner fast ice tongue consisted primarily of very thick, highly deformed first-year ice. The central part of the ice tongue was strongly ridged with ice thicknesses of up to 18 meters. However, there was much thinner ice between 1 and 2 meters thick immediately adjacent and north of the Filchner Ice Shelf, indicating the presence of open water and polynyas earlier in the winter, and a highly dynamic ice regime leading to the formation of the fast ice tongue. In contrast to fast ice along the eastern Weddell Sea shelf and elsewhere in Antarctica, we hardly found any evidence of the presence of platelet ice below the fast ice. This result has important implications for oceanographic conditions in the region off the Filchner Ronne Ice Shelves as it indicates the absence of Ice Shelf water near the ocean surface. Conference Object Antarc* Antarctic Antarctica Berkner Island Ice Shelf Ice Shelves Iceberg* Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Antarctic Weddell Sea Weddell Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Landfast sea ice (fast ice) attached to the Antarctic coast is a key component of the regional atmosphere-ice-ocean- and eco-systems. Through its direct coupling with the atmosphere and ocean, changes of fast ice and its snow cover are also potential indicators of climate change. Some Antarctic fast ice survives several summers and, therefore, contributes to reductions of iceberg calving and stabilization of glaciers. Also, large amounts of platelet ice can accumulate under fast ice, indicating the presence of Ice Shelf Water (ISW) and therefore of nearby ice shelf bottom melt. During the R/V Polarstern expedition FROST (Filchner Ronne Outflow System Tomorrow, PS111) in February 2018 to the southern Weddell Sea we investigated the thickness of the Berkner Island fast-ice tongue and the platelet ice accumulation beneath. We carried out five helicopter electromagnetic induction (HEM) surveys to measure sea-ice and sub-ice platelet layer thicknesses of this prominent fast ice region off the Filcher and Ronne Ice Shelves. Results showed that the Berkner fast ice tongue consisted primarily of very thick, highly deformed first-year ice. The central part of the ice tongue was strongly ridged with ice thicknesses of up to 18 meters. However, there was much thinner ice between 1 and 2 meters thick immediately adjacent and north of the Filchner Ice Shelf, indicating the presence of open water and polynyas earlier in the winter, and a highly dynamic ice regime leading to the formation of the fast ice tongue. In contrast to fast ice along the eastern Weddell Sea shelf and elsewhere in Antarctica, we hardly found any evidence of the presence of platelet ice below the fast ice. This result has important implications for oceanographic conditions in the region off the Filchner Ronne Ice Shelves as it indicates the absence of Ice Shelf water near the ocean surface. |
format |
Conference Object |
author |
Arndt, Stefanie Haas, Christian |
spellingShingle |
Arndt, Stefanie Haas, Christian Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
author_facet |
Arndt, Stefanie Haas, Christian |
author_sort |
Arndt, Stefanie |
title |
Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
title_short |
Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
title_full |
Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
title_fullStr |
Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
title_full_unstemmed |
Thickness of the Berkner Island fast-ice tongue: Implications for ISW |
title_sort |
thickness of the berkner island fast-ice tongue: implications for isw |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/52679/ https://hdl.handle.net/10013/epic.e836ace0-4698-4199-81df-f0ea57ec5a1c |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
geographic |
Antarctic The Antarctic Weddell Sea Weddell Berkner Island Filchner Ice Shelf |
geographic_facet |
Antarctic The Antarctic Weddell Sea Weddell Berkner Island Filchner Ice Shelf |
genre |
Antarc* Antarctic Antarctica Berkner Island Ice Shelf Ice Shelves Iceberg* Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Berkner Island Ice Shelf Ice Shelves Iceberg* Sea ice Weddell Sea |
op_source |
EPIC3FRISP 2019, Oxford, UK, 2019-09-15-2019-09-18 |
op_relation |
Arndt, S. orcid:0000-0001-9782-3844 and Haas, C. orcid:0000-0002-7674-3500 (2019) Thickness of the Berkner Island fast-ice tongue: Implications for ISW , FRISP 2019, Oxford, UK, 15 September 2019 - 18 September 2019 . hdl:10013/epic.e836ace0-4698-4199-81df-f0ea57ec5a1c |
_version_ |
1766222155464310784 |