Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier)
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7648–7654, doi:10.1002/2015GL064944. The mass loss at...
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Language: | English |
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Online Access: | https://hdl.handle.net/1912/7641 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7641 2023-05-15T17:23:45+02:00 Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) Wilson, Nathaniel J. Straneo, Fiamma 2015-09-22 application/pdf https://hdl.handle.net/1912/7641 en_US eng John Wiley & Sons https://doi.org/10.1002/2015GL064944 Geophysical Research Letters 42 (2015): 7648–7654 https://hdl.handle.net/1912/7641 doi:10.1002/2015GL064944 Geophysical Research Letters 42 (2015): 7648–7654 doi:10.1002/2015GL064944 79North Ice tongue NEGIS Nioghalvfjerdsfjorden Circulation Ice-ocean Article 2015 ftwhoas https://doi.org/10.1002/2015GL064944 2022-05-28T22:59:27Z Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7648–7654, doi:10.1002/2015GL064944. The mass loss at Nioghalvfjerdsbræ is primarily due to rapid submarine melting. Ocean data obtained from beneath the Nioghalvfjerdsbræ ice tongue show that melting is driven by the presence of warm (1°C) Atlantic Intermediate Water (AIW). A sill prevents AIW from entering the cavity from Dijmphna Sund, requiring that it flow into the cavity via bathymetric channels to the south at a pinned ice front. Comparison of water properties from the cavity, Dijmphna Sund, and the continental shelf support this conclusion. Overturning circulation rates inferred from observed melt rates and cavity stratification suggest an exchange flow between the cavity and the continental shelf of 38mSv, sufficient to flush cavity waters in under 1 year. These results place upper bounds on the timescales of external variability that can be transmitted to the glacier via the ice tongue cavity. NASA Grant Number: NNX13AK88G, NSF Grant Number: OCE-1434041 2016-03-22 Article in Journal/Newspaper Nioghalvfjerdsfjorden Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Sund ENVELOPE(13.644,13.644,66.207,66.207) Nioghalvfjerdsfjorden ENVELOPE(-21.500,-21.500,79.500,79.500) Dijmphna Sund ENVELOPE(-20.000,-20.000,80.033,80.033) Geophysical Research Letters 42 18 7648 7654 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
79North Ice tongue NEGIS Nioghalvfjerdsfjorden Circulation Ice-ocean |
spellingShingle |
79North Ice tongue NEGIS Nioghalvfjerdsfjorden Circulation Ice-ocean Wilson, Nathaniel J. Straneo, Fiamma Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
topic_facet |
79North Ice tongue NEGIS Nioghalvfjerdsfjorden Circulation Ice-ocean |
description |
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7648–7654, doi:10.1002/2015GL064944. The mass loss at Nioghalvfjerdsbræ is primarily due to rapid submarine melting. Ocean data obtained from beneath the Nioghalvfjerdsbræ ice tongue show that melting is driven by the presence of warm (1°C) Atlantic Intermediate Water (AIW). A sill prevents AIW from entering the cavity from Dijmphna Sund, requiring that it flow into the cavity via bathymetric channels to the south at a pinned ice front. Comparison of water properties from the cavity, Dijmphna Sund, and the continental shelf support this conclusion. Overturning circulation rates inferred from observed melt rates and cavity stratification suggest an exchange flow between the cavity and the continental shelf of 38mSv, sufficient to flush cavity waters in under 1 year. These results place upper bounds on the timescales of external variability that can be transmitted to the glacier via the ice tongue cavity. NASA Grant Number: NNX13AK88G, NSF Grant Number: OCE-1434041 2016-03-22 |
format |
Article in Journal/Newspaper |
author |
Wilson, Nathaniel J. Straneo, Fiamma |
author_facet |
Wilson, Nathaniel J. Straneo, Fiamma |
author_sort |
Wilson, Nathaniel J. |
title |
Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
title_short |
Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
title_full |
Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
title_fullStr |
Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
title_full_unstemmed |
Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbræ (79 North Glacier) |
title_sort |
water exchange between the continental shelf and the cavity beneath nioghalvfjerdsbræ (79 north glacier) |
publisher |
John Wiley & Sons |
publishDate |
2015 |
url |
https://hdl.handle.net/1912/7641 |
long_lat |
ENVELOPE(13.644,13.644,66.207,66.207) ENVELOPE(-21.500,-21.500,79.500,79.500) ENVELOPE(-20.000,-20.000,80.033,80.033) |
geographic |
Sund Nioghalvfjerdsfjorden Dijmphna Sund |
geographic_facet |
Sund Nioghalvfjerdsfjorden Dijmphna Sund |
genre |
Nioghalvfjerdsfjorden |
genre_facet |
Nioghalvfjerdsfjorden |
op_source |
Geophysical Research Letters 42 (2015): 7648–7654 doi:10.1002/2015GL064944 |
op_relation |
https://doi.org/10.1002/2015GL064944 Geophysical Research Letters 42 (2015): 7648–7654 https://hdl.handle.net/1912/7641 doi:10.1002/2015GL064944 |
op_doi |
https://doi.org/10.1002/2015GL064944 |
container_title |
Geophysical Research Letters |
container_volume |
42 |
container_issue |
18 |
container_start_page |
7648 |
op_container_end_page |
7654 |
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1766114177361903616 |