Modern sedimentation patterns in Potter Cove, King George Island, Antarctica
IMCOAST among a number of other initiatives investigates the modern and the late Holocene environmental de- velopment of south King George Island with a strong emphasis on Maxwell Bay and its tributary fjord Potter Cove (maximum water depth: about 200 m). In this part of the project we aim at recons...
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ftawi:oai:epic.awi.de:32131 2023-05-15T13:45:22+02:00 Modern sedimentation patterns in Potter Cove, King George Island, Antarctica Hass, H. Christian Kuhn, Gerhard Wölfl, Anne-Cathrin Wittenberg, Nina Betzler, Christian 2013 https://epic.awi.de/id/eprint/32131/ https://hdl.handle.net/10013/epic.40780 unknown Geophysical Research Abstracts Hass, H. C. orcid:0000-0003-2649-6828 , Kuhn, G. orcid:0000-0001-6069-7485 , Wölfl, A. C. , Wittenberg, N. and Betzler, C. (2013) Modern sedimentation patterns in Potter Cove, King George Island, Antarctica , EGU General Assembly 2013, Vienna, 7 April 2013 - 12 April 2013 . hdl:10013/epic.40780 EPIC3EGU General Assembly 2013, Vienna, 2013-04-07-2013-04-12Geophysical Research Abstracts Conference notRev 2013 ftawi 2022-10-02T23:12:31Z IMCOAST among a number of other initiatives investigates the modern and the late Holocene environmental de- velopment of south King George Island with a strong emphasis on Maxwell Bay and its tributary fjord Potter Cove (maximum water depth: about 200 m). In this part of the project we aim at reconstructing the modern sediment distribution in the inner part of Potter Cove using an acoustic ground discrimination system (RoxAnn) and more than136 ground-truth samples. Over the past 20 years the air temperatures in the immediate working area increased by more than 0.6 K (Schloss et al. 2012) which is less than in other parts of the West Antarctic Peninsula (WAP) but it is still in the range of the recovery of temperatures from the Little Ice Age maximum to the beginning of the 20th century. Potter Cove is a small fjord characterized by a series of moraine ridges produced by a tidewater glacier (Fourcade Glacier). Presumably, the farthest moraine is not much older than about 500 years (LIA maxi- mum), hence the sediment cover is rather thin as evidenced by high resolution seismic data. Since a few years at least the better part of the tidewater glacier retreated onto the island’s mainland. It is suggested that such a fun- damental change in the fjord’s physiography has also changed sedimentation patterns in the area. Potter Cove is characterized by silty-clayey sediments in the deeper inner parts of the cove. Sediments are coarser (fine to coarse sands and boulders) in the shallower areas; they also coarsen from the innermost basin to the mouth of the fjord. Textural structures follow the seabed morphology, i.e. small v-shaped passages through the moraine ridges. The glacier still produces large amounts of turbid melt waters that enter the cove at various places. We presume that very fine-grained sediments fall out from the meltwater plumes and are distributed by mid-depth or even bottom currents, thus suggesting an anti-estuarine circulation pattern. Older sediments that are more distal to the glacier front and ... Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica King George Island Maxwell Bay Tidewater Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Antarctic Peninsula King George Island Potter Cove Maxwell Bay ENVELOPE(-58.859,-58.859,-62.223,-62.223) Fourcade ENVELOPE(-62.490,-62.490,-64.612,-64.612) Fourcade Glacier ENVELOPE(-58.666,-58.666,-62.216,-62.216) |
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 |
IMCOAST among a number of other initiatives investigates the modern and the late Holocene environmental de- velopment of south King George Island with a strong emphasis on Maxwell Bay and its tributary fjord Potter Cove (maximum water depth: about 200 m). In this part of the project we aim at reconstructing the modern sediment distribution in the inner part of Potter Cove using an acoustic ground discrimination system (RoxAnn) and more than136 ground-truth samples. Over the past 20 years the air temperatures in the immediate working area increased by more than 0.6 K (Schloss et al. 2012) which is less than in other parts of the West Antarctic Peninsula (WAP) but it is still in the range of the recovery of temperatures from the Little Ice Age maximum to the beginning of the 20th century. Potter Cove is a small fjord characterized by a series of moraine ridges produced by a tidewater glacier (Fourcade Glacier). Presumably, the farthest moraine is not much older than about 500 years (LIA maxi- mum), hence the sediment cover is rather thin as evidenced by high resolution seismic data. Since a few years at least the better part of the tidewater glacier retreated onto the island’s mainland. It is suggested that such a fun- damental change in the fjord’s physiography has also changed sedimentation patterns in the area. Potter Cove is characterized by silty-clayey sediments in the deeper inner parts of the cove. Sediments are coarser (fine to coarse sands and boulders) in the shallower areas; they also coarsen from the innermost basin to the mouth of the fjord. Textural structures follow the seabed morphology, i.e. small v-shaped passages through the moraine ridges. The glacier still produces large amounts of turbid melt waters that enter the cove at various places. We presume that very fine-grained sediments fall out from the meltwater plumes and are distributed by mid-depth or even bottom currents, thus suggesting an anti-estuarine circulation pattern. Older sediments that are more distal to the glacier front and ... |
format |
Conference Object |
author |
Hass, H. Christian Kuhn, Gerhard Wölfl, Anne-Cathrin Wittenberg, Nina Betzler, Christian |
spellingShingle |
Hass, H. Christian Kuhn, Gerhard Wölfl, Anne-Cathrin Wittenberg, Nina Betzler, Christian Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
author_facet |
Hass, H. Christian Kuhn, Gerhard Wölfl, Anne-Cathrin Wittenberg, Nina Betzler, Christian |
author_sort |
Hass, H. Christian |
title |
Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
title_short |
Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
title_full |
Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
title_fullStr |
Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
title_full_unstemmed |
Modern sedimentation patterns in Potter Cove, King George Island, Antarctica |
title_sort |
modern sedimentation patterns in potter cove, king george island, antarctica |
publisher |
Geophysical Research Abstracts |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/32131/ https://hdl.handle.net/10013/epic.40780 |
long_lat |
ENVELOPE(-58.859,-58.859,-62.223,-62.223) ENVELOPE(-62.490,-62.490,-64.612,-64.612) ENVELOPE(-58.666,-58.666,-62.216,-62.216) |
geographic |
Antarctic Antarctic Peninsula King George Island Potter Cove Maxwell Bay Fourcade Fourcade Glacier |
geographic_facet |
Antarctic Antarctic Peninsula King George Island Potter Cove Maxwell Bay Fourcade Fourcade Glacier |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island Maxwell Bay Tidewater |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica King George Island Maxwell Bay Tidewater |
op_source |
EPIC3EGU General Assembly 2013, Vienna, 2013-04-07-2013-04-12Geophysical Research Abstracts |
op_relation |
Hass, H. C. orcid:0000-0003-2649-6828 , Kuhn, G. orcid:0000-0001-6069-7485 , Wölfl, A. C. , Wittenberg, N. and Betzler, C. (2013) Modern sedimentation patterns in Potter Cove, King George Island, Antarctica , EGU General Assembly 2013, Vienna, 7 April 2013 - 12 April 2013 . hdl:10013/epic.40780 |
_version_ |
1766223018732814336 |