Ocean interactions with the base of Amery Ice Shelf, Antarctica
Using a two-dimensional ocean themohaline circulation model, we varied the cavity shape beneath Amery Ice Shelf in an attempt to reproduce the 150-m-thick marine ice layer observed at the 'G1' ice core site. Most simulations caused melting rates which decrease the ice thickness by as much...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19930037350 2023-05-15T13:22:01+02:00 Ocean interactions with the base of Amery Ice Shelf, Antarctica Hellmer, Hartmut H. Jacobs, Stanley S. Unclassified, Unlimited, Publicly available Dec. 15, 1992 http://ntrs.nasa.gov/search.jsp?R=19930037350 unknown http://ntrs.nasa.gov/search.jsp?R=19930037350 Accession ID: 93A21347 Copyright Other Sources 48 Journal of Geophysical Research; 97; C12; p. 20,305-20,317. 1992 ftnasantrs 2012-02-15T20:00:54Z Using a two-dimensional ocean themohaline circulation model, we varied the cavity shape beneath Amery Ice Shelf in an attempt to reproduce the 150-m-thick marine ice layer observed at the 'G1' ice core site. Most simulations caused melting rates which decrease the ice thickness by as much as 400 m between grounding line and G1, but produce only minor accumulation at the ice core site and closer to the ice front. Changes in the sea floor and ice topographies revealed a high sensitivity of the basal mass balance to water column thickness near the grounding line, to submarine sills, and to discontinuities in ice thickness. Model results showed temperature/salinity gradients similar to observations from beneath other ice shelves where ice is melting into seawater. Modeled outflow characteristics at the ice front are in general agreement with oceanographic data from Prydz Bay. We concur with Morgan's inference that the G1 core may have been taken in a basal crevasse filled with marine ice. This ice is formed from water cooled by ocean/ice shelf interactions along the interior ice shelf base. Other/Unknown Material Amery Ice Shelf Antarc* Antarctica ice core Ice Shelf Ice Shelves Prydz Bay NASA Technical Reports Server (NTRS) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Prydz Bay |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
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48 |
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48 Hellmer, Hartmut H. Jacobs, Stanley S. Ocean interactions with the base of Amery Ice Shelf, Antarctica |
topic_facet |
48 |
description |
Using a two-dimensional ocean themohaline circulation model, we varied the cavity shape beneath Amery Ice Shelf in an attempt to reproduce the 150-m-thick marine ice layer observed at the 'G1' ice core site. Most simulations caused melting rates which decrease the ice thickness by as much as 400 m between grounding line and G1, but produce only minor accumulation at the ice core site and closer to the ice front. Changes in the sea floor and ice topographies revealed a high sensitivity of the basal mass balance to water column thickness near the grounding line, to submarine sills, and to discontinuities in ice thickness. Model results showed temperature/salinity gradients similar to observations from beneath other ice shelves where ice is melting into seawater. Modeled outflow characteristics at the ice front are in general agreement with oceanographic data from Prydz Bay. We concur with Morgan's inference that the G1 core may have been taken in a basal crevasse filled with marine ice. This ice is formed from water cooled by ocean/ice shelf interactions along the interior ice shelf base. |
format |
Other/Unknown Material |
author |
Hellmer, Hartmut H. Jacobs, Stanley S. |
author_facet |
Hellmer, Hartmut H. Jacobs, Stanley S. |
author_sort |
Hellmer, Hartmut H. |
title |
Ocean interactions with the base of Amery Ice Shelf, Antarctica |
title_short |
Ocean interactions with the base of Amery Ice Shelf, Antarctica |
title_full |
Ocean interactions with the base of Amery Ice Shelf, Antarctica |
title_fullStr |
Ocean interactions with the base of Amery Ice Shelf, Antarctica |
title_full_unstemmed |
Ocean interactions with the base of Amery Ice Shelf, Antarctica |
title_sort |
ocean interactions with the base of amery ice shelf, antarctica |
publishDate |
1992 |
url |
http://ntrs.nasa.gov/search.jsp?R=19930037350 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Prydz Bay |
geographic_facet |
Amery Amery Ice Shelf Prydz Bay |
genre |
Amery Ice Shelf Antarc* Antarctica ice core Ice Shelf Ice Shelves Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctica ice core Ice Shelf Ice Shelves Prydz Bay |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19930037350 Accession ID: 93A21347 |
op_rights |
Copyright |
_version_ |
1766362872666914816 |