Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea
A survey of the southern Amundsen and Bellingshausen seas in early 1994 included the first deepoceanographic measurements along the calving front of Pine Island Glacier, which drains~2x10^5 km^2 of the marine-based West Antarctic Ice Sheet. The measurements reveal a cycloniccirculation in Pine Islan...
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ftawi:oai:epic.awi.de:1254 2023-09-05T13:11:46+02:00 Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea Hellmer, Hartmut Jacobs, S. S. Jenkins, A. 1998 https://epic.awi.de/id/eprint/1254/ https://hdl.handle.net/10013/epic.11843 unknown Hellmer, H. orcid:0000-0002-9357-9853 , Jacobs, S. S. and Jenkins, A. (1998) Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea , Ocean, Ice, and Atmosphere: Interactions at the Antarctic continental margin (S Jacobs, R Weiss, eds ) Antarctic Research Series, AGU, Washington DC, USA, 75 , pp. 319-339 . hdl:10013/epic.11843 EPIC3Ocean, Ice, and Atmosphere: Interactions at the Antarctic continental margin (S Jacobs, R Weiss, eds ) Antarctic Research Series, AGU, Washington DC, USA, 75, pp. 319-339, ISBN: 0-87590-910-8 Article peerRev 1998 ftawi 2023-08-22T19:42:32Z A survey of the southern Amundsen and Bellingshausen seas in early 1994 included the first deepoceanographic measurements along the calving front of Pine Island Glacier, which drains~2x10^5 km^2 of the marine-based West Antarctic Ice Sheet. The measurements reveal a cycloniccirculation in Pine Island Bay and >1 degC Circumpolar Deep Water flowing beneath and rapidlymelting the floating base of this deep-rooted glacier. Dissolved oxygen measurements show asubsurface oxygenation of the water column resulting from air bubbles in the melting ice. Seawateroxygen isotope analyses imply average delta18O values of -29 permil for precipitation on thecatchment basin that subsequently melts at the glacier base. Application of a two-dimensionalthermohaline circulation model to the sub-ice shelf cavity supports average basal melt rates inexcess of 10 m/a calculated by two other methods. This melt rate is more than 5 times the averagereported for any Antarctic ice shelf, drives Circumploar Deep Water upwelling on the continentalshelf, and generates melt-laden outflows that are well above surface freezing temperature. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Bay Pine Island Glacier Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Sea Antarctic Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) West Antarctic Ice Sheet |
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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 |
A survey of the southern Amundsen and Bellingshausen seas in early 1994 included the first deepoceanographic measurements along the calving front of Pine Island Glacier, which drains~2x10^5 km^2 of the marine-based West Antarctic Ice Sheet. The measurements reveal a cycloniccirculation in Pine Island Bay and >1 degC Circumpolar Deep Water flowing beneath and rapidlymelting the floating base of this deep-rooted glacier. Dissolved oxygen measurements show asubsurface oxygenation of the water column resulting from air bubbles in the melting ice. Seawateroxygen isotope analyses imply average delta18O values of -29 permil for precipitation on thecatchment basin that subsequently melts at the glacier base. Application of a two-dimensionalthermohaline circulation model to the sub-ice shelf cavity supports average basal melt rates inexcess of 10 m/a calculated by two other methods. This melt rate is more than 5 times the averagereported for any Antarctic ice shelf, drives Circumploar Deep Water upwelling on the continentalshelf, and generates melt-laden outflows that are well above surface freezing temperature. |
format |
Article in Journal/Newspaper |
author |
Hellmer, Hartmut Jacobs, S. S. Jenkins, A. |
spellingShingle |
Hellmer, Hartmut Jacobs, S. S. Jenkins, A. Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
author_facet |
Hellmer, Hartmut Jacobs, S. S. Jenkins, A. |
author_sort |
Hellmer, Hartmut |
title |
Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
title_short |
Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
title_full |
Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
title_fullStr |
Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
title_full_unstemmed |
Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea |
title_sort |
oceanic erosion of a floating antarctic glacier in the amundsen sea |
publishDate |
1998 |
url |
https://epic.awi.de/id/eprint/1254/ https://hdl.handle.net/10013/epic.11843 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Amundsen Sea Antarctic Island Bay Pine Island Bay Pine Island Glacier West Antarctic Ice Sheet |
geographic_facet |
Amundsen Sea Antarctic Island Bay Pine Island Bay Pine Island Glacier West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Bay Pine Island Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Bay Pine Island Glacier |
op_source |
EPIC3Ocean, Ice, and Atmosphere: Interactions at the Antarctic continental margin (S Jacobs, R Weiss, eds ) Antarctic Research Series, AGU, Washington DC, USA, 75, pp. 319-339, ISBN: 0-87590-910-8 |
op_relation |
Hellmer, H. orcid:0000-0002-9357-9853 , Jacobs, S. S. and Jenkins, A. (1998) Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea , Ocean, Ice, and Atmosphere: Interactions at the Antarctic continental margin (S Jacobs, R Weiss, eds ) Antarctic Research Series, AGU, Washington DC, USA, 75 , pp. 319-339 . hdl:10013/epic.11843 |
_version_ |
1776196977532338176 |