Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials
International audience Abstract Circum-Arctic glacial ice is melting in an unprecedented mode, and release of currently trapped geological methane may act as a positive feedback on ice-sheet retreat during global warming. Evidence for methane release during the penultimate (Eemian, ca. 125 ka) inter...
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Online Access: | https://doi.org/10.1130/G48580.1 https://hal.univ-brest.fr/hal-03324926 |
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fttriple:oai:gotriple.eu:10670/1.w764b1 2023-05-15T14:59:13+02:00 Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials Dessandier, P.-A. Knies, J. Plaza-Faverola, A. Labrousse, C. Renoult, M. Panieri, G. Laboratoire Environnement Profond (LEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2021-03-22 https://doi.org/10.1130/G48580.1 https://hal.univ-brest.fr/hal-03324926 en eng HAL CCSD Geological Society of America hal-03324926 doi:10.1130/G48580.1 10670/1.w764b1 https://hal.univ-brest.fr/hal-03324926 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0091-7613 EISSN: 0091-7613 Geology Geology, Geological Society of America, 2021, 49 (7), pp.799-803. ⟨10.1130/G48580.1⟩ Feedback Glacial geology Glaciers Global warming Methane Offshore gas fields Offshore oil well production Petroleum reservoirs Sea ice geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.1130/G48580.1 2023-01-22T17:10:41Z International audience Abstract Circum-Arctic glacial ice is melting in an unprecedented mode, and release of currently trapped geological methane may act as a positive feedback on ice-sheet retreat during global warming. Evidence for methane release during the penultimate (Eemian, ca. 125 ka) interglacial, a period with less glacial sea ice and higher temperatures than today, is currently absent. Here, we argue that based on foraminiferal isotope studies on drill holes from offshore Svalbard, Norway, methane leakage occurred upon the abrupt Eurasian ice-sheet wastage during terminations of the last (Weichselian) and penultimate (Saalian) glaciations. Progressive increase of methane emissions seems to be first recorded by depleted benthic foraminiferal δ13C. This is quickly followed by the precipitation of methane-derived authigenic carbonate as overgrowth inside and outside foraminiferal shells, characterized by heavy δ18O and depleted δ13C of both benthic and planktonic foraminifera. The similarities between the events observed over both terminations advocate for a common driver for the episodic release of geological methane stocks. Our favored model is recurrent leakage of shallow gas reservoirs below the gas hydrate stability zone along the margin of western Svalbard that can be reactivated upon initial instability of the grounded, marine-based ice sheets. Analogous to this model, with the current acceleration of the Greenland ice melt, instabilities of existing methane reservoirs below and nearby the ice sheet are likely. Article in Journal/Newspaper Arctic Foraminifera* Global warming Greenland Ice Sheet Planktonic foraminifera Sea ice Svalbard Unknown Arctic Greenland Norway Svalbard Geology 49 7 799 803 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Feedback Glacial geology Glaciers Global warming Methane Offshore gas fields Offshore oil well production Petroleum reservoirs Sea ice geo envir |
spellingShingle |
Feedback Glacial geology Glaciers Global warming Methane Offshore gas fields Offshore oil well production Petroleum reservoirs Sea ice geo envir Dessandier, P.-A. Knies, J. Plaza-Faverola, A. Labrousse, C. Renoult, M. Panieri, G. Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
topic_facet |
Feedback Glacial geology Glaciers Global warming Methane Offshore gas fields Offshore oil well production Petroleum reservoirs Sea ice geo envir |
description |
International audience Abstract Circum-Arctic glacial ice is melting in an unprecedented mode, and release of currently trapped geological methane may act as a positive feedback on ice-sheet retreat during global warming. Evidence for methane release during the penultimate (Eemian, ca. 125 ka) interglacial, a period with less glacial sea ice and higher temperatures than today, is currently absent. Here, we argue that based on foraminiferal isotope studies on drill holes from offshore Svalbard, Norway, methane leakage occurred upon the abrupt Eurasian ice-sheet wastage during terminations of the last (Weichselian) and penultimate (Saalian) glaciations. Progressive increase of methane emissions seems to be first recorded by depleted benthic foraminiferal δ13C. This is quickly followed by the precipitation of methane-derived authigenic carbonate as overgrowth inside and outside foraminiferal shells, characterized by heavy δ18O and depleted δ13C of both benthic and planktonic foraminifera. The similarities between the events observed over both terminations advocate for a common driver for the episodic release of geological methane stocks. Our favored model is recurrent leakage of shallow gas reservoirs below the gas hydrate stability zone along the margin of western Svalbard that can be reactivated upon initial instability of the grounded, marine-based ice sheets. Analogous to this model, with the current acceleration of the Greenland ice melt, instabilities of existing methane reservoirs below and nearby the ice sheet are likely. |
author2 |
Laboratoire Environnement Profond (LEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Dessandier, P.-A. Knies, J. Plaza-Faverola, A. Labrousse, C. Renoult, M. Panieri, G. |
author_facet |
Dessandier, P.-A. Knies, J. Plaza-Faverola, A. Labrousse, C. Renoult, M. Panieri, G. |
author_sort |
Dessandier, P.-A. |
title |
Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
title_short |
Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
title_full |
Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
title_fullStr |
Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
title_full_unstemmed |
Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials |
title_sort |
ice-sheet melt drove methane emissions in the arctic during the last two interglacials |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://doi.org/10.1130/G48580.1 https://hal.univ-brest.fr/hal-03324926 |
geographic |
Arctic Greenland Norway Svalbard |
geographic_facet |
Arctic Greenland Norway Svalbard |
genre |
Arctic Foraminifera* Global warming Greenland Ice Sheet Planktonic foraminifera Sea ice Svalbard |
genre_facet |
Arctic Foraminifera* Global warming Greenland Ice Sheet Planktonic foraminifera Sea ice Svalbard |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0091-7613 EISSN: 0091-7613 Geology Geology, Geological Society of America, 2021, 49 (7), pp.799-803. ⟨10.1130/G48580.1⟩ |
op_relation |
hal-03324926 doi:10.1130/G48580.1 10670/1.w764b1 https://hal.univ-brest.fr/hal-03324926 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1130/G48580.1 |
container_title |
Geology |
container_volume |
49 |
container_issue |
7 |
container_start_page |
799 |
op_container_end_page |
803 |
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1766331349128445952 |