Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica
The dynamics of ice-sheets in response to climate changes becomes increasingly a focus of research. In this regard the glacial history of the Amundsen Sea sector of the West Antarctic Ice-Sheet (WAIS) is of particular interest. A potential deglaciation and collapse of the Thwaites and Pine Island gl...
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ftawi:oai:epic.awi.de:18484 2023-05-15T13:23:49+02:00 Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. 2008 https://epic.awi.de/id/eprint/18484/ https://hdl.handle.net/10013/epic.30139 unknown Weigelt, E. orcid:0000-0003-1598-456X , Gohl, K. orcid:0000-0002-9558-2116 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Larter, R. (2008) Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica , Internationale Polartagung 2008, 10. - 14. Mar, Münster. . hdl:10013/epic.30139 EPIC3Internationale Polartagung 2008, 10. - 14. Mar, Münster. Conference notRev 2008 ftawi 2021-12-24T15:32:36Z The dynamics of ice-sheets in response to climate changes becomes increasingly a focus of research. In this regard the glacial history of the Amundsen Sea sector of the West Antarctic Ice-Sheet (WAIS) is of particular interest. A potential deglaciation and collapse of the Thwaites and Pine Island glacier drainage basins alone would result in a global sea level rise of approximately 1.5 m. New multichannel seismic reflection data of high-resolution offer a record of the glacial development and processes in this area. We present a first interpretation of five seismic profiles collected in the western Amundsen Sea Embayment as part of the RV Polarstern cruise ANT-XXIII/4 (2006). The sea-floor morphology of the observed area is highly variable. Close to the present coast, a rough topography includes several troughs with a depth of almost 2000 m which were probably formed by paleo-icestreams cut through the shelf. Here, the seismic lines reveal hardly any sediments. Only a thin sedimentary cover or some sediment pockets (< 80 ms TWT ~ 60 m) on and in between these steep and rugged structures can be identified. On the northern shelf and outside the troughs, the topography is generally smooth and shows only small surface undulations. Northwest-dipping reflectors are striking features in the seismic lines and indicate well pronounced sedimentary sequences of more than 1 s TWT thickness (> 800 m). We suggest for this region a much quieter deposition realm, which was not much affected by melt water streams. These older and dipping layers form an unconformity with the young sedimentary cover running parallel to the seafloor. Only this uppermost cover is interrupted by small scale roughness features of a few meters height. At some locations, shallow and about 10 km wide channel-like structures cut through the upper sedimentary cover. They may be an indication for the activity of recent melt-water streams. Conference Object Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Sea Antarctic Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) West Antarctic Ice Sheet West Antarctica |
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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 |
The dynamics of ice-sheets in response to climate changes becomes increasingly a focus of research. In this regard the glacial history of the Amundsen Sea sector of the West Antarctic Ice-Sheet (WAIS) is of particular interest. A potential deglaciation and collapse of the Thwaites and Pine Island glacier drainage basins alone would result in a global sea level rise of approximately 1.5 m. New multichannel seismic reflection data of high-resolution offer a record of the glacial development and processes in this area. We present a first interpretation of five seismic profiles collected in the western Amundsen Sea Embayment as part of the RV Polarstern cruise ANT-XXIII/4 (2006). The sea-floor morphology of the observed area is highly variable. Close to the present coast, a rough topography includes several troughs with a depth of almost 2000 m which were probably formed by paleo-icestreams cut through the shelf. Here, the seismic lines reveal hardly any sediments. Only a thin sedimentary cover or some sediment pockets (< 80 ms TWT ~ 60 m) on and in between these steep and rugged structures can be identified. On the northern shelf and outside the troughs, the topography is generally smooth and shows only small surface undulations. Northwest-dipping reflectors are striking features in the seismic lines and indicate well pronounced sedimentary sequences of more than 1 s TWT thickness (> 800 m). We suggest for this region a much quieter deposition realm, which was not much affected by melt water streams. These older and dipping layers form an unconformity with the young sedimentary cover running parallel to the seafloor. Only this uppermost cover is interrupted by small scale roughness features of a few meters height. At some locations, shallow and about 10 km wide channel-like structures cut through the upper sedimentary cover. They may be an indication for the activity of recent melt-water streams. |
format |
Conference Object |
author |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. |
spellingShingle |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
author_facet |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. |
author_sort |
Weigelt, Estella |
title |
Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
title_short |
Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
title_full |
Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
title_fullStr |
Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
title_full_unstemmed |
Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica |
title_sort |
ice-sheet variations as depicted in seismic records of the amundsen sea embayment, west antarctica |
publishDate |
2008 |
url |
https://epic.awi.de/id/eprint/18484/ https://hdl.handle.net/10013/epic.30139 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Amundsen Sea Antarctic Pine Island Glacier West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Amundsen Sea Antarctic Pine Island Glacier West Antarctic Ice Sheet West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
op_source |
EPIC3Internationale Polartagung 2008, 10. - 14. Mar, Münster. |
op_relation |
Weigelt, E. orcid:0000-0003-1598-456X , Gohl, K. orcid:0000-0002-9558-2116 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Larter, R. (2008) Ice-sheet variations as depicted in seismic records of the Amundsen Sea Embayment, West Antarctica , Internationale Polartagung 2008, 10. - 14. Mar, Münster. . hdl:10013/epic.30139 |
_version_ |
1766375568233725952 |