Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery
We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-s...
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ftdoajarticles:oai:doaj.org/article:51abc47cedf24a15a80199ac716d99f4 2023-05-15T14:02:12+02:00 Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery C. Lavoie E. W. Domack E. C. Pettit T. A. Scambos R. D. Larter H.-W. Schenke K. C. Yoo J. Gutt J. Wellner M. Canals J. B. Anderson D. Amblas 2015-04-01T00:00:00Z https://doi.org/10.5194/tc-9-613-2015 https://doaj.org/article/51abc47cedf24a15a80199ac716d99f4 EN eng Copernicus Publications http://www.the-cryosphere.net/9/613/2015/tc-9-613-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-613-2015 https://doaj.org/article/51abc47cedf24a15a80199ac716d99f4 The Cryosphere, Vol 9, Iss 2, Pp 613-629 (2015) Environmental sciences GE1-350 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/tc-9-613-2015 2022-12-31T12:54:16Z We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger "streaming flow" is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-ice-stream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Robertson Island The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Jason Peninsula ENVELOPE(-61.667,-61.667,-66.250,-66.250) Robertson Island ENVELOPE(-59.667,-59.667,-65.167,-65.167) Seal Nunataks ENVELOPE(-60.255,-60.255,-65.049,-65.049) The Cryosphere 9 2 613 629 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 C. Lavoie E. W. Domack E. C. Pettit T. A. Scambos R. D. Larter H.-W. Schenke K. C. Yoo J. Gutt J. Wellner M. Canals J. B. Anderson D. Amblas Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger "streaming flow" is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-ice-stream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel. |
format |
Article in Journal/Newspaper |
author |
C. Lavoie E. W. Domack E. C. Pettit T. A. Scambos R. D. Larter H.-W. Schenke K. C. Yoo J. Gutt J. Wellner M. Canals J. B. Anderson D. Amblas |
author_facet |
C. Lavoie E. W. Domack E. C. Pettit T. A. Scambos R. D. Larter H.-W. Schenke K. C. Yoo J. Gutt J. Wellner M. Canals J. B. Anderson D. Amblas |
author_sort |
C. Lavoie |
title |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
title_short |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
title_full |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
title_fullStr |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
title_full_unstemmed |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
title_sort |
configuration of the northern antarctic peninsula ice sheet at lgm based on a new synthesis of seabed imagery |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-613-2015 https://doaj.org/article/51abc47cedf24a15a80199ac716d99f4 |
long_lat |
ENVELOPE(-61.667,-61.667,-66.250,-66.250) ENVELOPE(-59.667,-59.667,-65.167,-65.167) ENVELOPE(-60.255,-60.255,-65.049,-65.049) |
geographic |
Antarctic Antarctic Peninsula Jason Peninsula Robertson Island Seal Nunataks |
geographic_facet |
Antarctic Antarctic Peninsula Jason Peninsula Robertson Island Seal Nunataks |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Robertson Island The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Robertson Island The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 2, Pp 613-629 (2015) |
op_relation |
http://www.the-cryosphere.net/9/613/2015/tc-9-613-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-613-2015 https://doaj.org/article/51abc47cedf24a15a80199ac716d99f4 |
op_doi |
https://doi.org/10.5194/tc-9-613-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
2 |
container_start_page |
613 |
op_container_end_page |
629 |
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1766272329183133696 |