The Postglacial response of Arctic Ocean gas hydrates to climatic amelioration

Pavel Serov, Sunil Vadakkepuliyambatta, Jürgen Mienert, Henry Patton, Alexey Portnov, Anna Silyakova, Giuliana Panieri, JoLynn Carroll, Karin Andreassen, Alun Hubbard

Research output: Contribution to journalArticlepeer-review

88 Citations (SciVal)
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Abstract

Seafloor methane release due to the thermal dissociation of gas hydrates is pervasive across the continental margins of the Arctic Ocean. Furthermore, there is increasing awareness that shallow hydrate-related methane seeps have appeared due to enhanced warming of Arctic Ocean bottom water during the last century. Although it has been argued that a gas hydrate gun could trigger abrupt climate change, the processes and rates of subsurface/atmospheric natural gas exchange remain uncertain. Here we investigate the dynamics between gas hydrate stability and environmental changes from the height of the last glaciation through to the present day. Using geophysical observations from offshore Svalbard to constrain a coupled ice sheet/gas hydrate model, we identify distinct phases of subglacial methane sequestration and subsequent release on ice sheet retreat that led to the formation of a suite of seafloor domes. Reconstructing the evolution of this dome field, we find that incursions of warm Atlantic bottom water forced rapid gas hydrate dissociation and enhanced methane emissions during the penultimate Heinrich event, the Bølling and Allerød interstadials, and the Holocene optimum. Our results highlight the complex interplay between the cryosphere, geosphere, and atmosphere over the last 30,000 y that led to extensive changes in subseafloor carbon storage that forced distinct episodes of methane release due to natural climate variability well before recent anthropogenic warming
Original languageEnglish
Pages (from-to)6215-6220
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number24
Early online date05 Jun 2017
DOIs
Publication statusPublished - 13 Jun 2017

Keywords

  • Arctic Ocean
  • gas hydrate
  • methane release
  • climate change

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