Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia
West Antarctica is well known for its rapid and strong reaction to environmental change. Since the beginning of the recent warming trend in the 1980ies the West Antarctic Peninsula belongs to the fastest warming regions on Earth. In places temperatures increased by 2.5°K over 50 years (Faraday/Verna...
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ftawi:oai:epic.awi.de:30649 2024-09-15T17:44:58+00:00 Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia Kuhn, Gerhard Hass, Christian Wittenberg, Nina Wölfl, Anne-Cathrin Tosonotto, G. V. 2012-04-26 https://epic.awi.de/id/eprint/30649/ https://hdl.handle.net/10013/epic.39589 unknown National Research Council Canada Kuhn, G. orcid:0000-0001-6069-7485 , Hass, C. orcid:0000-0003-2649-6828 , Wittenberg, N. , Wölfl, A. C. and Tosonotto, G. V. (2012) Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia , International Polar Year 2012: From Knowledge to Action, Palais des Congres, Montreal, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39589 EPIC3International Polar Year 2012: From Knowledge to Action, Palais des Congres, Montreal, 2012-04-22-2012-04-27Montreal, National Research Council Canada Conference notRev 2012 ftawi 2024-06-24T04:05:07Z West Antarctica is well known for its rapid and strong reaction to environmental change. Since the beginning of the recent warming trend in the 1980ies the West Antarctic Peninsula belongs to the fastest warming regions on Earth. In places temperatures increased by 2.5°K over 50 years (Faraday/Vernadsky Station) thus leading to decreasing sea-ice formation and increasing glacier retreat. Situated in the sensitive latitudes between 62 and 63°S, Maxwell Bay and its tributary fjord Potter Cove are the focus of the international interdisciplinary research project IMCOAST. Here we present results of the sedimentology working group that is investigating modern and subrecent sedimentary processes in order to emphasize the climate signal in the sedimentary record. Five age-dated sediment cores (lengths between 126 and 980cm) from locations in Maxwell Bay, about 130 seafloor samples on a 200m grid in Potter Cove, shallow (high-resolution) seismic transects measured in Potter Cove and Maxwell Bay as well as areawide sidescan sonar images and single-beam bathymetric data from Potter Cove form the data base for the interpretations. Shallow seismics reveal more than 50m well-layered sediments within Maxwell Bay, but very low sound penetration in Potter cove at water depths < 200 m. The inner Potter Cove at water depths of < 60m shows strong traces of ploughing icebergs. These are most likely also responsible for the lack of sound penetration in the outer cove where large icebergs likely mixed up and compacted sediment in many places. Sediment core PS69/335 (980cm long, spanning the past 1700 years) taken between Potter and Marian coves (Maxwell Bay) reveals generally coarser grained sediments during colder climate phases such as the Little Ice Age (AD 1350-1900) and finer sediments during warm phases such as the Medieval Warm Period (AD 900-1350). This is interpreted to be a result of increased discharge of meltwater carrying fine-grained sediment during warmer phases and, contrary, reduced supply of finer sediment ... Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Maxwell Bay Sea ice West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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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 |
West Antarctica is well known for its rapid and strong reaction to environmental change. Since the beginning of the recent warming trend in the 1980ies the West Antarctic Peninsula belongs to the fastest warming regions on Earth. In places temperatures increased by 2.5°K over 50 years (Faraday/Vernadsky Station) thus leading to decreasing sea-ice formation and increasing glacier retreat. Situated in the sensitive latitudes between 62 and 63°S, Maxwell Bay and its tributary fjord Potter Cove are the focus of the international interdisciplinary research project IMCOAST. Here we present results of the sedimentology working group that is investigating modern and subrecent sedimentary processes in order to emphasize the climate signal in the sedimentary record. Five age-dated sediment cores (lengths between 126 and 980cm) from locations in Maxwell Bay, about 130 seafloor samples on a 200m grid in Potter Cove, shallow (high-resolution) seismic transects measured in Potter Cove and Maxwell Bay as well as areawide sidescan sonar images and single-beam bathymetric data from Potter Cove form the data base for the interpretations. Shallow seismics reveal more than 50m well-layered sediments within Maxwell Bay, but very low sound penetration in Potter cove at water depths < 200 m. The inner Potter Cove at water depths of < 60m shows strong traces of ploughing icebergs. These are most likely also responsible for the lack of sound penetration in the outer cove where large icebergs likely mixed up and compacted sediment in many places. Sediment core PS69/335 (980cm long, spanning the past 1700 years) taken between Potter and Marian coves (Maxwell Bay) reveals generally coarser grained sediments during colder climate phases such as the Little Ice Age (AD 1350-1900) and finer sediments during warm phases such as the Medieval Warm Period (AD 900-1350). This is interpreted to be a result of increased discharge of meltwater carrying fine-grained sediment during warmer phases and, contrary, reduced supply of finer sediment ... |
format |
Conference Object |
author |
Kuhn, Gerhard Hass, Christian Wittenberg, Nina Wölfl, Anne-Cathrin Tosonotto, G. V. |
spellingShingle |
Kuhn, Gerhard Hass, Christian Wittenberg, Nina Wölfl, Anne-Cathrin Tosonotto, G. V. Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
author_facet |
Kuhn, Gerhard Hass, Christian Wittenberg, Nina Wölfl, Anne-Cathrin Tosonotto, G. V. |
author_sort |
Kuhn, Gerhard |
title |
Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
title_short |
Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
title_full |
Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
title_fullStr |
Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
title_full_unstemmed |
Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia |
title_sort |
sediment distribution and depositional processes in maxwell bay and potter cove (king george island, antarctica) now and during the past millennia |
publisher |
National Research Council Canada |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30649/ https://hdl.handle.net/10013/epic.39589 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Maxwell Bay Sea ice West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Maxwell Bay Sea ice West Antarctica |
op_source |
EPIC3International Polar Year 2012: From Knowledge to Action, Palais des Congres, Montreal, 2012-04-22-2012-04-27Montreal, National Research Council Canada |
op_relation |
Kuhn, G. orcid:0000-0001-6069-7485 , Hass, C. orcid:0000-0003-2649-6828 , Wittenberg, N. , Wölfl, A. C. and Tosonotto, G. V. (2012) Sediment distribution and depositional processes in Maxwell Bay and Potter Cove (King George Island, Antarctica) now and during the past millennia , International Polar Year 2012: From Knowledge to Action, Palais des Congres, Montreal, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39589 |
_version_ |
1810492658665127936 |