A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf
We present a new, high resolution (300 m) bathymetric grid of the continental shelf surrounding the South Orkney Islands, northeast of the Antarctic Peninsula. The new grid, derived from a compilation of marine echo-sounding data, improves previous regional bathymetric representations and helps to v...
Published in: | Geochemistry, Geophysics, Geosystems |
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Language: | English |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/506995/ https://nora.nerc.ac.uk/id/eprint/506995/1/ggge20484.pdf |
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ftnerc:oai:nora.nerc.ac.uk:506995 2023-05-15T13:48:08+02:00 A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf Dickens, William A. Graham, Alastair G. C. Smith, James A. Dowdeswell, Julian A. Larter, Robert D. Hillenbrand, Claus-Dieter Trathan, Phil N. Arndt, Jan Erik Kuhn, Gerard 2014-06-24 text http://nora.nerc.ac.uk/id/eprint/506995/ https://nora.nerc.ac.uk/id/eprint/506995/1/ggge20484.pdf en eng Wiley https://nora.nerc.ac.uk/id/eprint/506995/1/ggge20484.pdf Dickens, William A.; Graham, Alastair G. C.; Smith, James A. orcid:0000-0002-1333-2544 Dowdeswell, Julian A.; Larter, Robert D. orcid:0000-0002-8414-7389 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Trathan, Phil N. orcid:0000-0001-6673-9930 Arndt, Jan Erik; Kuhn, Gerard. 2014 A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf. Geochemistry, Geophysics, Geosystems, 15 (6). 2494-2514. https://doi.org/10.1002/2014GC005323 <https://doi.org/10.1002/2014GC005323> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1002/2014GC005323 2023-02-04T19:39:34Z We present a new, high resolution (300 m) bathymetric grid of the continental shelf surrounding the South Orkney Islands, northeast of the Antarctic Peninsula. The new grid, derived from a compilation of marine echo-sounding data, improves previous regional bathymetric representations and helps to visualize the morphology of the shelf in unrivalled detail. The compilation forms important baseline information for a range of scientific applications and end users including oceanographers, glacial modelers, biologists, and geologists. In particular, due to the limited understanding of glacial history in this region, the bathymetry provides the first detailed insights into past glacial regimes. The continental shelf is dominated by seven glacially eroded troughs, marking the pathways of glacial outlets that once drained a former ice cap centered on the South Orkney Islands. During previous glacial periods, grounded ice extended to the shelf edge north of the islands. A large, ∼250 km long sediment depocenter, interpreted as a maximum former ice limit of one or more Cenozoic glaciations, suggests that ice was only grounded to the ∼300–350 m contour in the south. Hypsometric analyses support this interpretation, indicating that a significant proportion of the shelf has been unaffected by glacial erosion. Using these observations, we propose a preliminary ice cap reconstruction for maximum glaciation of the South Orkney plateau, suggesting an ice coverage of about ∼19,000 km2. The timing of maximum ice extent, number of past advances and pattern of subsequent deglaciation(s) remain uncertain and will require further targeted marine geological and geophysical investigations to resolve. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice cap South Orkney Islands Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) South Orkney Plateau ENVELOPE(-44.157,-44.157,-60.690,-60.690) Geochemistry, Geophysics, Geosystems 15 6 2494 2514 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
We present a new, high resolution (300 m) bathymetric grid of the continental shelf surrounding the South Orkney Islands, northeast of the Antarctic Peninsula. The new grid, derived from a compilation of marine echo-sounding data, improves previous regional bathymetric representations and helps to visualize the morphology of the shelf in unrivalled detail. The compilation forms important baseline information for a range of scientific applications and end users including oceanographers, glacial modelers, biologists, and geologists. In particular, due to the limited understanding of glacial history in this region, the bathymetry provides the first detailed insights into past glacial regimes. The continental shelf is dominated by seven glacially eroded troughs, marking the pathways of glacial outlets that once drained a former ice cap centered on the South Orkney Islands. During previous glacial periods, grounded ice extended to the shelf edge north of the islands. A large, ∼250 km long sediment depocenter, interpreted as a maximum former ice limit of one or more Cenozoic glaciations, suggests that ice was only grounded to the ∼300–350 m contour in the south. Hypsometric analyses support this interpretation, indicating that a significant proportion of the shelf has been unaffected by glacial erosion. Using these observations, we propose a preliminary ice cap reconstruction for maximum glaciation of the South Orkney plateau, suggesting an ice coverage of about ∼19,000 km2. The timing of maximum ice extent, number of past advances and pattern of subsequent deglaciation(s) remain uncertain and will require further targeted marine geological and geophysical investigations to resolve. |
format |
Article in Journal/Newspaper |
author |
Dickens, William A. Graham, Alastair G. C. Smith, James A. Dowdeswell, Julian A. Larter, Robert D. Hillenbrand, Claus-Dieter Trathan, Phil N. Arndt, Jan Erik Kuhn, Gerard |
spellingShingle |
Dickens, William A. Graham, Alastair G. C. Smith, James A. Dowdeswell, Julian A. Larter, Robert D. Hillenbrand, Claus-Dieter Trathan, Phil N. Arndt, Jan Erik Kuhn, Gerard A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
author_facet |
Dickens, William A. Graham, Alastair G. C. Smith, James A. Dowdeswell, Julian A. Larter, Robert D. Hillenbrand, Claus-Dieter Trathan, Phil N. Arndt, Jan Erik Kuhn, Gerard |
author_sort |
Dickens, William A. |
title |
A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
title_short |
A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
title_full |
A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
title_fullStr |
A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
title_full_unstemmed |
A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf |
title_sort |
new bathymetric compilation for the south orkney islands, antarctic peninsula (49°-39°w to 64°-59°s): insights into the glacial development of the continental shelf |
publisher |
Wiley |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/506995/ https://nora.nerc.ac.uk/id/eprint/506995/1/ggge20484.pdf |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-44.157,-44.157,-60.690,-60.690) |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Orkney Islands South Orkney Plateau |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Orkney Islands South Orkney Plateau |
genre |
Antarc* Antarctic Antarctic Peninsula Ice cap South Orkney Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice cap South Orkney Islands |
op_relation |
https://nora.nerc.ac.uk/id/eprint/506995/1/ggge20484.pdf Dickens, William A.; Graham, Alastair G. C.; Smith, James A. orcid:0000-0002-1333-2544 Dowdeswell, Julian A.; Larter, Robert D. orcid:0000-0002-8414-7389 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Trathan, Phil N. orcid:0000-0001-6673-9930 Arndt, Jan Erik; Kuhn, Gerard. 2014 A new bathymetric compilation for the South Orkney Islands, Antarctic Peninsula (49°-39°W to 64°-59°S): insights into the glacial development of the continental shelf. Geochemistry, Geophysics, Geosystems, 15 (6). 2494-2514. https://doi.org/10.1002/2014GC005323 <https://doi.org/10.1002/2014GC005323> |
op_doi |
https://doi.org/10.1002/2014GC005323 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
15 |
container_issue |
6 |
container_start_page |
2494 |
op_container_end_page |
2514 |
_version_ |
1766248754551193600 |