Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I
Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociatin...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | http://www.osti.gov/servlets/purl/1532977 https://www.osti.gov/biblio/1532977 https://doi.org/10.1002/2016gc006584 |
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ftosti:oai:osti.gov:1532977 2023-07-30T04:01:52+02:00 Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I Brothers, Laura L. Herman, Bruce M. Hart, Patrick E. Ruppel, Carolyn D. 2021-08-02 application/pdf http://www.osti.gov/servlets/purl/1532977 https://www.osti.gov/biblio/1532977 https://doi.org/10.1002/2016gc006584 unknown http://www.osti.gov/servlets/purl/1532977 https://www.osti.gov/biblio/1532977 https://doi.org/10.1002/2016gc006584 doi:10.1002/2016gc006584 58 GEOSCIENCES 2021 ftosti https://doi.org/10.1002/2016gc006584 2023-07-11T09:34:46Z Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies interpreted the distribution of subsea permafrost on the U.S. Beaufort continental shelf based on geographically sparse data sets and modeling of expected thermal history. The most cited work projects subsea permafrost to the shelf edge (~100 m isobath). This study uses a compilation of stacking velocity analyses from ~100,000 line-km of industry-collected multichannel seismic reflection data acquired over 57,000 km 2 of the U.S. Beaufort shelf to delineate continuous subsea IBPF. Gridded average velocities of the uppermost 750 ms two-way travel time range from 1475 to 3110 m s -1 . The monotonic, cross-shore pattern in velocity distribution suggests that the seaward extent of continuous IBPF is within 37 km of the modern shoreline at water depths < 25 m. These interpretations corroborate recent Beaufort seismic refraction studies and provide the best, margin-scale evidence that continuous subsea IBPF does not currently extend to the northern limits of the continental shelf. Other/Unknown Material Arctic Ice permafrost SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Geochemistry, Geophysics, Geosystems 17 11 4354 4365 |
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Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
spellingShingle |
58 GEOSCIENCES Brothers, Laura L. Herman, Bruce M. Hart, Patrick E. Ruppel, Carolyn D. Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
topic_facet |
58 GEOSCIENCES |
description |
Subsea ice-bearing permafrost (IBPF) and associated gas hydrate in the Arctic have been subject to a warming climate and saline intrusion since the last transgression at the end of the Pleistocene. The consequent degradation of IBPF is potentially associated with significant degassing of dissociating gas hydrate deposits. Previous studies interpreted the distribution of subsea permafrost on the U.S. Beaufort continental shelf based on geographically sparse data sets and modeling of expected thermal history. The most cited work projects subsea permafrost to the shelf edge (~100 m isobath). This study uses a compilation of stacking velocity analyses from ~100,000 line-km of industry-collected multichannel seismic reflection data acquired over 57,000 km 2 of the U.S. Beaufort shelf to delineate continuous subsea IBPF. Gridded average velocities of the uppermost 750 ms two-way travel time range from 1475 to 3110 m s -1 . The monotonic, cross-shore pattern in velocity distribution suggests that the seaward extent of continuous IBPF is within 37 km of the modern shoreline at water depths < 25 m. These interpretations corroborate recent Beaufort seismic refraction studies and provide the best, margin-scale evidence that continuous subsea IBPF does not currently extend to the northern limits of the continental shelf. |
author |
Brothers, Laura L. Herman, Bruce M. Hart, Patrick E. Ruppel, Carolyn D. |
author_facet |
Brothers, Laura L. Herman, Bruce M. Hart, Patrick E. Ruppel, Carolyn D. |
author_sort |
Brothers, Laura L. |
title |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
title_short |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
title_full |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
title_fullStr |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
title_full_unstemmed |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin: 1. Minimum seaward extent defined from multichannel seismic reflection data: SUBSEA PERMAFROST ON THE U.S. BEAUFORT I |
title_sort |
subsea ice-bearing permafrost on the u.s. beaufort margin: 1. minimum seaward extent defined from multichannel seismic reflection data: subsea permafrost on the u.s. beaufort i |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1532977 https://www.osti.gov/biblio/1532977 https://doi.org/10.1002/2016gc006584 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Beaufort Shelf |
geographic_facet |
Arctic Beaufort Shelf |
genre |
Arctic Ice permafrost |
genre_facet |
Arctic Ice permafrost |
op_relation |
http://www.osti.gov/servlets/purl/1532977 https://www.osti.gov/biblio/1532977 https://doi.org/10.1002/2016gc006584 doi:10.1002/2016gc006584 |
op_doi |
https://doi.org/10.1002/2016gc006584 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
11 |
container_start_page |
4354 |
op_container_end_page |
4365 |
_version_ |
1772812612196630528 |