Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials
Large (about 5 per mil) millennial-scale benthic foraminiferal carbon isotopic oscillations in the Santa Barbara Basin during the last 60,000 years reflect widespread shoaling of sedimentary methane gradients and increased outgassing from gas hydrate dissociation during interstadials. Furthermore, s...
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Online Access: | http://dx.doi.org/10.1126/science.288.5463.128 https://www.science.org/doi/pdf/10.1126/science.288.5463.128 |
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craaas:10.1126/science.288.5463.128 2024-06-23T07:54:37+00:00 Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials Kennett, James P. Cannariato, Kevin G. Hendy, Ingrid L. Behl, Richard J. 2000 http://dx.doi.org/10.1126/science.288.5463.128 https://www.science.org/doi/pdf/10.1126/science.288.5463.128 en eng American Association for the Advancement of Science (AAAS) Science volume 288, issue 5463, page 128-133 ISSN 0036-8075 1095-9203 journal-article 2000 craaas https://doi.org/10.1126/science.288.5463.128 2024-06-13T04:01:39Z Large (about 5 per mil) millennial-scale benthic foraminiferal carbon isotopic oscillations in the Santa Barbara Basin during the last 60,000 years reflect widespread shoaling of sedimentary methane gradients and increased outgassing from gas hydrate dissociation during interstadials. Furthermore, several large, brief, negative excursions (up to –6 per mil) coinciding with smaller shifts (up to –3 per mil) in depth-stratified planktonic foraminiferal species indicate massive releases of methane from basin sediments. Gas hydrate stability was modulated by intermediate-water temperature changes induced by switches in thermohaline circulation. These oscillations were likely widespread along the California margin and elsewhere, affecting gas hydrate instability and contributing to millennial-scale atmospheric methane oscillations. Article in Journal/Newspaper Methane hydrate AAAS Resource Center (American Association for the Advancement of Science) Science 288 5463 128 133 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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English |
description |
Large (about 5 per mil) millennial-scale benthic foraminiferal carbon isotopic oscillations in the Santa Barbara Basin during the last 60,000 years reflect widespread shoaling of sedimentary methane gradients and increased outgassing from gas hydrate dissociation during interstadials. Furthermore, several large, brief, negative excursions (up to –6 per mil) coinciding with smaller shifts (up to –3 per mil) in depth-stratified planktonic foraminiferal species indicate massive releases of methane from basin sediments. Gas hydrate stability was modulated by intermediate-water temperature changes induced by switches in thermohaline circulation. These oscillations were likely widespread along the California margin and elsewhere, affecting gas hydrate instability and contributing to millennial-scale atmospheric methane oscillations. |
format |
Article in Journal/Newspaper |
author |
Kennett, James P. Cannariato, Kevin G. Hendy, Ingrid L. Behl, Richard J. |
spellingShingle |
Kennett, James P. Cannariato, Kevin G. Hendy, Ingrid L. Behl, Richard J. Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
author_facet |
Kennett, James P. Cannariato, Kevin G. Hendy, Ingrid L. Behl, Richard J. |
author_sort |
Kennett, James P. |
title |
Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
title_short |
Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
title_full |
Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
title_fullStr |
Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
title_full_unstemmed |
Carbon Isotopic Evidence for Methane Hydrate Instability During Quaternary Interstadials |
title_sort |
carbon isotopic evidence for methane hydrate instability during quaternary interstadials |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1126/science.288.5463.128 https://www.science.org/doi/pdf/10.1126/science.288.5463.128 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Science volume 288, issue 5463, page 128-133 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.288.5463.128 |
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Science |
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288 |
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5463 |
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128 |
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133 |
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1802646823660158976 |