1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary?
Abstract. During the Paleocene-Eocene Thermal Maximum (PETM, ~55 Ma), marine and terrestrial carbon isotope values exhibit a negative shift of at least 2.5‰, indicative of massive destabilization of marine methane hydrates, releasing ~1100 gigatonnes of methane carbon. The cause of the hydrate desta...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.651.3169 2023-05-15T17:12:01+02:00 1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? Karen L. Bice Jochem Marotzke The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.651.3169 http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.651.3169 http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf text ftciteseerx 2016-01-08T16:24:27Z Abstract. During the Paleocene-Eocene Thermal Maximum (PETM, ~55 Ma), marine and terrestrial carbon isotope values exhibit a negative shift of at least 2.5‰, indicative of massive destabilization of marine methane hydrates, releasing ~1100 gigatonnes of methane carbon. The cause of the hydrate destabilization is unknown but has been speculated to be warming due to a change from high-latitude to low-latitude deepwater formation. Here, we present results from a numerical ocean model indicating that a sudden switch of deepwater formation from southern to northern high latitudes caused mid-depth and deep-ocean warming of 3-5 ° C. The switch is caused by a slow increase in the intensity of the atmospheric hydrologic cycle, as expected under increasing temperatures and consistent with PETM sedimentary evidence. Deepened subduction prior to the thermohaline circulation switch causes warming of 1-4 ° C in limited areas at thermocline through upper intermediate depths, which could destabilize methane hydrates gradually and at progressively greater depths. The switch itself occurs abruptly, with up to 5 ° C warming resulting everywhere in the deep ocean. 1. Text Methane hydrate Unknown |
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Abstract. During the Paleocene-Eocene Thermal Maximum (PETM, ~55 Ma), marine and terrestrial carbon isotope values exhibit a negative shift of at least 2.5‰, indicative of massive destabilization of marine methane hydrates, releasing ~1100 gigatonnes of methane carbon. The cause of the hydrate destabilization is unknown but has been speculated to be warming due to a change from high-latitude to low-latitude deepwater formation. Here, we present results from a numerical ocean model indicating that a sudden switch of deepwater formation from southern to northern high latitudes caused mid-depth and deep-ocean warming of 3-5 ° C. The switch is caused by a slow increase in the intensity of the atmospheric hydrologic cycle, as expected under increasing temperatures and consistent with PETM sedimentary evidence. Deepened subduction prior to the thermohaline circulation switch causes warming of 1-4 ° C in limited areas at thermocline through upper intermediate depths, which could destabilize methane hydrates gradually and at progressively greater depths. The switch itself occurs abruptly, with up to 5 ° C warming resulting everywhere in the deep ocean. 1. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Karen L. Bice Jochem Marotzke |
spellingShingle |
Karen L. Bice Jochem Marotzke 1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
author_facet |
Karen L. Bice Jochem Marotzke |
author_sort |
Karen L. Bice |
title |
1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
title_short |
1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
title_full |
1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
title_fullStr |
1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
title_full_unstemmed |
1Did changing ocean circulation destabilize methane hydrate at the Paleocene/ Eocene boundary? |
title_sort |
1did changing ocean circulation destabilize methane hydrate at the paleocene/ eocene boundary? |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.651.3169 http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.651.3169 http://eprints.soton.ac.uk/231/1/BICE_%26_MAROTZKE_paper_paleoce_figures.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766068776625766400 |