Stable isotope and geochemical record of sediments from the Bering Sea
here is controversy over the role of marine methane hydrates in atmospheric methane concentrations and climate change during the last glacial period. In this study of two sediment cores from the southeast Bering Sea (700 m and 1467 m water depth), we identify multiple episodes during the last glacia...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.830695 2023-05-15T15:43:41+02:00 Stable isotope and geochemical record of sediments from the Bering Sea Cook, Mea S Keigwin, Lloyd D Birgel, Daniel Hinrichs, Kai-Uwe MEDIAN LATITUDE: 54.541550 * MEDIAN LONGITUDE: -168.106850 * SOUTH-BOUND LATITUDE: 54.530000 * WEST-BOUND LONGITUDE: -168.666900 * NORTH-BOUND LATITUDE: 54.553100 * EAST-BOUND LONGITUDE: -167.546800 * DATE/TIME START: 2002-07-03T00:00:00 * DATE/TIME END: 2002-07-05T00:00:00 2011-03-18 application/zip, 11 datasets https://doi.pangaea.de/10.1594/PANGAEA.830695 https://doi.org/10.1594/PANGAEA.830695 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.830695 https://doi.org/10.1594/PANGAEA.830695 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Cook, Mea S; Keigwin, Lloyd D; Birgel, Daniel; Hinrichs, Kai-Uwe (2011): Repeated pulses of vertical methane flux recorded in glacial sediments from the southeast Bering Sea. Paleoceanography, 26(2), PA2210, https://doi.org/10.1029/2010PA001993 Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.830695 https://doi.org/10.1029/2010PA001993 2023-01-20T07:33:15Z here is controversy over the role of marine methane hydrates in atmospheric methane concentrations and climate change during the last glacial period. In this study of two sediment cores from the southeast Bering Sea (700 m and 1467 m water depth), we identify multiple episodes during the last glacial period of intense methane flux reaching the seafloor. Within the uncertainty of the radiocarbon age model, the episodes are contemporaneous in the two cores and have similar timing and duration as Dansgaard-Oeschger events. The episodes are marked by horizons of sediment containing 13C-depleted authigenic carbonate minerals; 13C-depleted archaeal and bacterial lipids, which resemble those found in ANME-1 type anaerobic methane oxidizing microbial consortia; and changes in the abundance and species distribution of benthic foraminifera. The similar timing and isotopic composition of the authigenic carbonates in the two cores is consistent with a region-wide increase in the upward flux of methane bearing fluids. This study is the first observation outside Santa Barbara Basin of pervasive, repeated methane flux in glacial sediments. However, contrary to the "Clathrate Gun Hypothesis" (Kennett et al., 2003), these coring sites are too deep for methane hydrate destabilization to be the cause, implying that a much larger part of the ocean's sedimentary methane may participate in climate or carbon cycle feedback at millennial timescales. We speculate that pulses of methane in these opal-rich sediments could be caused by the sudden release of overpressure in pore fluids that builds up gradually with silica diagenesis. The release could be triggered by seismic shaking on the Aleutian subduction zone caused by hydrostatic pressure increase associated with sea level rise at the start of interstadials. Dataset Bering Sea Dansgaard-Oeschger events Methane hydrate PANGAEA - Data Publisher for Earth & Environmental Science Bering Sea Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(-168.666900,-167.546800,54.553100,54.530000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
here is controversy over the role of marine methane hydrates in atmospheric methane concentrations and climate change during the last glacial period. In this study of two sediment cores from the southeast Bering Sea (700 m and 1467 m water depth), we identify multiple episodes during the last glacial period of intense methane flux reaching the seafloor. Within the uncertainty of the radiocarbon age model, the episodes are contemporaneous in the two cores and have similar timing and duration as Dansgaard-Oeschger events. The episodes are marked by horizons of sediment containing 13C-depleted authigenic carbonate minerals; 13C-depleted archaeal and bacterial lipids, which resemble those found in ANME-1 type anaerobic methane oxidizing microbial consortia; and changes in the abundance and species distribution of benthic foraminifera. The similar timing and isotopic composition of the authigenic carbonates in the two cores is consistent with a region-wide increase in the upward flux of methane bearing fluids. This study is the first observation outside Santa Barbara Basin of pervasive, repeated methane flux in glacial sediments. However, contrary to the "Clathrate Gun Hypothesis" (Kennett et al., 2003), these coring sites are too deep for methane hydrate destabilization to be the cause, implying that a much larger part of the ocean's sedimentary methane may participate in climate or carbon cycle feedback at millennial timescales. We speculate that pulses of methane in these opal-rich sediments could be caused by the sudden release of overpressure in pore fluids that builds up gradually with silica diagenesis. The release could be triggered by seismic shaking on the Aleutian subduction zone caused by hydrostatic pressure increase associated with sea level rise at the start of interstadials. |
format |
Dataset |
author |
Cook, Mea S Keigwin, Lloyd D Birgel, Daniel Hinrichs, Kai-Uwe |
spellingShingle |
Cook, Mea S Keigwin, Lloyd D Birgel, Daniel Hinrichs, Kai-Uwe Stable isotope and geochemical record of sediments from the Bering Sea |
author_facet |
Cook, Mea S Keigwin, Lloyd D Birgel, Daniel Hinrichs, Kai-Uwe |
author_sort |
Cook, Mea S |
title |
Stable isotope and geochemical record of sediments from the Bering Sea |
title_short |
Stable isotope and geochemical record of sediments from the Bering Sea |
title_full |
Stable isotope and geochemical record of sediments from the Bering Sea |
title_fullStr |
Stable isotope and geochemical record of sediments from the Bering Sea |
title_full_unstemmed |
Stable isotope and geochemical record of sediments from the Bering Sea |
title_sort |
stable isotope and geochemical record of sediments from the bering sea |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.830695 https://doi.org/10.1594/PANGAEA.830695 |
op_coverage |
MEDIAN LATITUDE: 54.541550 * MEDIAN LONGITUDE: -168.106850 * SOUTH-BOUND LATITUDE: 54.530000 * WEST-BOUND LONGITUDE: -168.666900 * NORTH-BOUND LATITUDE: 54.553100 * EAST-BOUND LONGITUDE: -167.546800 * DATE/TIME START: 2002-07-03T00:00:00 * DATE/TIME END: 2002-07-05T00:00:00 |
long_lat |
ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(-168.666900,-167.546800,54.553100,54.530000) |
geographic |
Bering Sea Kennett |
geographic_facet |
Bering Sea Kennett |
genre |
Bering Sea Dansgaard-Oeschger events Methane hydrate |
genre_facet |
Bering Sea Dansgaard-Oeschger events Methane hydrate |
op_source |
Supplement to: Cook, Mea S; Keigwin, Lloyd D; Birgel, Daniel; Hinrichs, Kai-Uwe (2011): Repeated pulses of vertical methane flux recorded in glacial sediments from the southeast Bering Sea. Paleoceanography, 26(2), PA2210, https://doi.org/10.1029/2010PA001993 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.830695 https://doi.org/10.1594/PANGAEA.830695 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.830695 https://doi.org/10.1029/2010PA001993 |
_version_ |
1766377866589634560 |