Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic
We present results from a sediment core collected from a pockmark field on the Vestnesa Ridge (~ 80° N) in the eastern Fram Strait. This is the only deep-water gateway to the Arctic, and one of the northernmost marine gas hydrate provinces in the world. Eight 14C AMS dates reveal a detailed chronolo...
Published in: | Climate of the Past |
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Copernicus Publications
2015
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Online Access: | https://doi.org/10.5194/cp-11-669-2015 http://www.clim-past.net/11/669/2015/cp-11-669-2015.pdf https://doaj.org/article/4558dda9d3c14cfabae5a0dd3e079dfe |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:4558dda9d3c14cfabae5a0dd3e079dfe 2023-05-15T15:00:47+02:00 Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic C. Consolaro T. L. Rasmussen G. Panieri J. Mienert S. Bünz K. Sztybor 2015-04-01 https://doi.org/10.5194/cp-11-669-2015 http://www.clim-past.net/11/669/2015/cp-11-669-2015.pdf https://doaj.org/article/4558dda9d3c14cfabae5a0dd3e079dfe en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-11-669-2015 http://www.clim-past.net/11/669/2015/cp-11-669-2015.pdf https://doaj.org/article/4558dda9d3c14cfabae5a0dd3e079dfe undefined Climate of the Past, Vol 11, Iss 4, Pp 669-685 (2015) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/cp-11-669-2015 2023-01-22T17:53:29Z We present results from a sediment core collected from a pockmark field on the Vestnesa Ridge (~ 80° N) in the eastern Fram Strait. This is the only deep-water gateway to the Arctic, and one of the northernmost marine gas hydrate provinces in the world. Eight 14C AMS dates reveal a detailed chronology for the last 14 ka BP. The δ 13C record measured on the benthonic foraminiferal species Cassidulina neoteretis shows two distinct intervals with negative values termed carbon isotope excursion (CIE I and CIE II, respectively). The values were as low as −4.37‰ in CIE I, correlating with the Bølling–Allerød interstadials, and as low as −3.41‰ in CIE II, correlating with the early Holocene. In the Bølling–Allerød interstadials, the planktonic foraminifera also show negative values, probably indicating secondary methane-derived authigenic precipitation affecting the foraminiferal shells. After a cleaning procedure designed to remove authigenic carbonate coatings on benthonic foraminiferal tests from this event, the 13C values are still negative (as low as −2.75‰). The CIE I and CIE II occurred during periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere. CIEs with similar timing have been reported from other areas in the North Atlantic, suggesting a regional event. The trigger mechanisms for such regional events remain to be determined. We speculate that sea-level rise and seabed loading due to high sediment supply in combination with increased seismic activity as a result of rapid deglaciation may have triggered the escape of significant amounts of methane to the seafloor and the water column above. Article in Journal/Newspaper Arctic Foraminifera* Fram Strait North Atlantic Planktonic foraminifera Unknown Arctic Climate of the Past 11 4 669 685 |
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Open Polar |
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language |
English |
topic |
envir geo |
spellingShingle |
envir geo C. Consolaro T. L. Rasmussen G. Panieri J. Mienert S. Bünz K. Sztybor Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
topic_facet |
envir geo |
description |
We present results from a sediment core collected from a pockmark field on the Vestnesa Ridge (~ 80° N) in the eastern Fram Strait. This is the only deep-water gateway to the Arctic, and one of the northernmost marine gas hydrate provinces in the world. Eight 14C AMS dates reveal a detailed chronology for the last 14 ka BP. The δ 13C record measured on the benthonic foraminiferal species Cassidulina neoteretis shows two distinct intervals with negative values termed carbon isotope excursion (CIE I and CIE II, respectively). The values were as low as −4.37‰ in CIE I, correlating with the Bølling–Allerød interstadials, and as low as −3.41‰ in CIE II, correlating with the early Holocene. In the Bølling–Allerød interstadials, the planktonic foraminifera also show negative values, probably indicating secondary methane-derived authigenic precipitation affecting the foraminiferal shells. After a cleaning procedure designed to remove authigenic carbonate coatings on benthonic foraminiferal tests from this event, the 13C values are still negative (as low as −2.75‰). The CIE I and CIE II occurred during periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere. CIEs with similar timing have been reported from other areas in the North Atlantic, suggesting a regional event. The trigger mechanisms for such regional events remain to be determined. We speculate that sea-level rise and seabed loading due to high sediment supply in combination with increased seismic activity as a result of rapid deglaciation may have triggered the escape of significant amounts of methane to the seafloor and the water column above. |
format |
Article in Journal/Newspaper |
author |
C. Consolaro T. L. Rasmussen G. Panieri J. Mienert S. Bünz K. Sztybor |
author_facet |
C. Consolaro T. L. Rasmussen G. Panieri J. Mienert S. Bünz K. Sztybor |
author_sort |
C. Consolaro |
title |
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
title_short |
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
title_full |
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
title_fullStr |
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
title_full_unstemmed |
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic |
title_sort |
carbon isotope (δ13c) excursions suggest times of major methane release during the last 14 kyr in fram strait, the deep-water gateway to the arctic |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/cp-11-669-2015 http://www.clim-past.net/11/669/2015/cp-11-669-2015.pdf https://doaj.org/article/4558dda9d3c14cfabae5a0dd3e079dfe |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* Fram Strait North Atlantic Planktonic foraminifera |
genre_facet |
Arctic Foraminifera* Fram Strait North Atlantic Planktonic foraminifera |
op_source |
Climate of the Past, Vol 11, Iss 4, Pp 669-685 (2015) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-11-669-2015 http://www.clim-past.net/11/669/2015/cp-11-669-2015.pdf https://doaj.org/article/4558dda9d3c14cfabae5a0dd3e079dfe |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-11-669-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
4 |
container_start_page |
669 |
op_container_end_page |
685 |
_version_ |
1766332843218173952 |