SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA
The Bear Island Strait between Crosson and Dotson Ice Shelves in the Amundsen Sea Embayment sector of West Antarctica is an important junction for seawater exchange in the region. This work establishes that two previously distinct masses of seawater beneath the ice shelves now interact due to the th...
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ftdatacite:10.34944/dspace/4718 2023-05-15T13:23:47+02:00 SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA Unkn Unknown 2020 https://dx.doi.org/10.34944/dspace/4718 https://scholarshare.temple.edu/handle/20.500.12613/4736 en eng Temple University. Libraries IN COPYRIGHT- This Rights Statement can be used for an Item that is in copyright. Using this statement implies that the organization making this Item available has determined that the Item is in copyright and either is the rights-holder, has obtained permission from the rights-holder(s) to make their Work(s) available, or makes the Item available under an exception or limitation to copyright (including Fair Use) that entitles it to make the Item available. http://rightsstatements.org/vocab/InC/1.0/ Geophysics FOS Earth and related environmental sciences Geology Geography Amundsen Sea Embayment Bathymetry Crosson Dotson Ice Shelf Seismic Collection article Text 2020 ftdatacite https://doi.org/10.34944/dspace/4718 2021-11-05T12:55:41Z The Bear Island Strait between Crosson and Dotson Ice Shelves in the Amundsen Sea Embayment sector of West Antarctica is an important junction for seawater exchange in the region. This work establishes that two previously distinct masses of seawater beneath the ice shelves now interact due to the thinning of the ice that separated them. A pathway connecting the water masses is revealed using reflection-seismic spot soundings to measure the bathymetry and water-column thickness beneath the ice in the Bear Island Strait. The spot soundings reveal a seafloor that is deep (> 800 m below sea level) and continuous to allow circulation of a layer of deep, warm and salty sub-ice water mass into the strait. However, the geometry of the water column through the strait may only allow one-way circulation of this layer from the Crosson side to the Dotson side, with Dotson to Crosson circulation constricted to upper, cooler water. Crosson to Dotson circulation could account for the observed high melt rates (~10 m/yr) at the grounding line of a Dotson pinning point, consistent with an inverted channel previously imaged on the underside of the Dotson Ice Shelf. By extension, the pathway through the Bear Island Strait allows water exchange between two large bathymetric troughs on the continental shelf. These results indicate previously unaccounted for avenues of regional ocean circulation and heat exchange likely to the influence the future deglaciation rate of the Amundsen Sea Embayment and West Antarctica. Text Amundsen Sea Antarc* Antarctica Bear Island Dotson Ice Shelf Ice Shelf Ice Shelves West Antarctica DataCite Metadata Store (German National Library of Science and Technology) West Antarctica Amundsen Sea Bear Island ENVELOPE(-67.250,-67.250,-68.151,-68.151) Dotson Ice Shelf ENVELOPE(-112.367,-112.367,-74.400,-74.400) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Geophysics FOS Earth and related environmental sciences Geology Geography Amundsen Sea Embayment Bathymetry Crosson Dotson Ice Shelf Seismic |
spellingShingle |
Geophysics FOS Earth and related environmental sciences Geology Geography Amundsen Sea Embayment Bathymetry Crosson Dotson Ice Shelf Seismic Unkn Unknown SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
topic_facet |
Geophysics FOS Earth and related environmental sciences Geology Geography Amundsen Sea Embayment Bathymetry Crosson Dotson Ice Shelf Seismic |
description |
The Bear Island Strait between Crosson and Dotson Ice Shelves in the Amundsen Sea Embayment sector of West Antarctica is an important junction for seawater exchange in the region. This work establishes that two previously distinct masses of seawater beneath the ice shelves now interact due to the thinning of the ice that separated them. A pathway connecting the water masses is revealed using reflection-seismic spot soundings to measure the bathymetry and water-column thickness beneath the ice in the Bear Island Strait. The spot soundings reveal a seafloor that is deep (> 800 m below sea level) and continuous to allow circulation of a layer of deep, warm and salty sub-ice water mass into the strait. However, the geometry of the water column through the strait may only allow one-way circulation of this layer from the Crosson side to the Dotson side, with Dotson to Crosson circulation constricted to upper, cooler water. Crosson to Dotson circulation could account for the observed high melt rates (~10 m/yr) at the grounding line of a Dotson pinning point, consistent with an inverted channel previously imaged on the underside of the Dotson Ice Shelf. By extension, the pathway through the Bear Island Strait allows water exchange between two large bathymetric troughs on the continental shelf. These results indicate previously unaccounted for avenues of regional ocean circulation and heat exchange likely to the influence the future deglaciation rate of the Amundsen Sea Embayment and West Antarctica. |
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Text |
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Unkn Unknown |
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title |
SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
title_short |
SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
title_full |
SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
title_fullStr |
SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
title_full_unstemmed |
SEISMIC SPOT SOUNDINGS REVEAL DEEP BATHYMETRY AND THICK WATER COLUMN BETWEEN CROSSON AND DOTSON ICE SHELVES, WEST ANTARCTICA |
title_sort |
seismic spot soundings reveal deep bathymetry and thick water column between crosson and dotson ice shelves, west antarctica |
publisher |
Temple University. Libraries |
publishDate |
2020 |
url |
https://dx.doi.org/10.34944/dspace/4718 https://scholarshare.temple.edu/handle/20.500.12613/4736 |
long_lat |
ENVELOPE(-67.250,-67.250,-68.151,-68.151) ENVELOPE(-112.367,-112.367,-74.400,-74.400) |
geographic |
West Antarctica Amundsen Sea Bear Island Dotson Ice Shelf |
geographic_facet |
West Antarctica Amundsen Sea Bear Island Dotson Ice Shelf |
genre |
Amundsen Sea Antarc* Antarctica Bear Island Dotson Ice Shelf Ice Shelf Ice Shelves West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica Bear Island Dotson Ice Shelf Ice Shelf Ice Shelves West Antarctica |
op_rights |
IN COPYRIGHT- This Rights Statement can be used for an Item that is in copyright. Using this statement implies that the organization making this Item available has determined that the Item is in copyright and either is the rights-holder, has obtained permission from the rights-holder(s) to make their Work(s) available, or makes the Item available under an exception or limitation to copyright (including Fair Use) that entitles it to make the Item available. http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.34944/dspace/4718 |
_version_ |
1766375262794022912 |