Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365, doi:10.1002/2016GC006584. Subsea ic...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8744 2023-05-15T15:00:40+02:00 Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data Brothers, Laura L. Herman, Bruce M. Hart, Patrick E. Ruppel, Carolyn D. 2016-11-04 https://hdl.handle.net/1912/8744 en_US eng John Wiley & Sons https://doi.org/10.1002/2016GC006584 Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365 https://hdl.handle.net/1912/8744 doi:10.1002/2016GC006584 Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365 doi:10.1002/2016GC006584 Subsea permafrost Gas hydrates Multichannel seismic data Arctic Ocean Article 2016 ftwhoas https://doi.org/10.1002/2016GC006584 2022-05-28T22:59:50Z Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365, doi:10.1002/2016GC006584. 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 km2 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. DOE NETL/NRC Methane Hydrate Fellowship Grant Number: DE-FC26-05NT42248; USGS–DOE Interagency Agreements Grant Number: DE-FE000291 and 0023495 2017-05-04 Article in Journal/Newspaper Arctic Arctic Ocean Ice Methane hydrate permafrost Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Geochemistry, Geophysics, Geosystems 17 11 4354 4365 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Subsea permafrost Gas hydrates Multichannel seismic data Arctic Ocean |
spellingShingle |
Subsea permafrost Gas hydrates Multichannel seismic data Arctic Ocean 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 |
topic_facet |
Subsea permafrost Gas hydrates Multichannel seismic data Arctic Ocean |
description |
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365, doi:10.1002/2016GC006584. 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 km2 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. DOE NETL/NRC Methane Hydrate Fellowship Grant Number: DE-FC26-05NT42248; USGS–DOE Interagency Agreements Grant Number: DE-FE000291 and 0023495 2017-05-04 |
format |
Article in Journal/Newspaper |
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 |
title_short |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data |
title_full |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data |
title_fullStr |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data |
title_full_unstemmed |
Subsea ice-bearing permafrost on the U.S. Beaufort Margin : 1. Minimum seaward extent defined from multichannel seismic reflection data |
title_sort |
subsea ice-bearing permafrost on the u.s. beaufort margin : 1. minimum seaward extent defined from multichannel seismic reflection data |
publisher |
John Wiley & Sons |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/8744 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Arctic Ocean Beaufort Shelf |
geographic_facet |
Arctic Arctic Ocean Beaufort Shelf |
genre |
Arctic Arctic Ocean Ice Methane hydrate permafrost |
genre_facet |
Arctic Arctic Ocean Ice Methane hydrate permafrost |
op_source |
Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365 doi:10.1002/2016GC006584 |
op_relation |
https://doi.org/10.1002/2016GC006584 Geochemistry, Geophysics, Geosystems 17 (2016): 4354–4365 https://hdl.handle.net/1912/8744 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 |
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1766332754372329472 |