Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming
Source at: http://doi.org/10.1038/s41467-017-02550-9 Methane seepage from the upper continental slopes of Western Svalbard has previously been attributed to gas hydrate dissociation induced by anthropogenic warming of ambient bottom waters. Here we show that sediment cores drilled off Prins Karls Fo...
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ftunivtroemsoe:oai:munin.uit.no:10037/12571 2023-05-15T14:27:18+02:00 Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming Wallmann, Klaus Riedel, M. Hong, Wei-Li Patton, Henry Hubbard, Alun Lloyd Pape, T. Hsu, C.W. Schmidt, C. Johnson, Joel E. Torres, M.E. Andreassen, Karin Berndt, C. Bohrmann, G 2018-01-08 https://hdl.handle.net/10037/12571 https://doi.org/10.1038/s41467-017-02550-9 eng eng Nature Publishing Group Nature Communications info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Wallmann, K., Riedel, M., Hong, W-L., Patton, H., Hubbard, A. L., Pape, T., . Bohrmann, G. (2018). Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming. Nature Communications, 9(83), 1-9. http://doi.org/10.1038/s41467-017-02550-9 FRIDAID 1539649 doi:10.1038/s41467-017-02550-9 2041-1723 https://hdl.handle.net/10037/12571 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1038/s41467-017-02550-9 2021-06-25T17:55:39Z Source at: http://doi.org/10.1038/s41467-017-02550-9 Methane seepage from the upper continental slopes of Western Svalbard has previously been attributed to gas hydrate dissociation induced by anthropogenic warming of ambient bottom waters. Here we show that sediment cores drilled off Prins Karls Foreland contain freshwater from dissociating hydrates. However, our modeling indicates that the observed pore water freshening began around 8 ka BP when the rate of isostatic uplift outpaced eustatic sea-level rise. The resultant local shallowing and lowering of hydrostatic pressure forced gas hydrate dissociation and dissolved chloride depletions consistent with our geochemical analysis. Hence, we propose that hydrate dissociation was triggered by postglacial isostatic rebound rather than anthropogenic warming. Furthermore, we show that methane fluxes from dissociating hydrates were considerably smaller than present methane seepage rates implying that gas hydrates were not a major source of methane to the oceans, but rather acted as a dynamic seal, regulating methane release from deep geological reservoirs. Article in Journal/Newspaper Arctic Svalbard University of Tromsø: Munin Open Research Archive Svalbard Nature Communications 9 1 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 Wallmann, Klaus Riedel, M. Hong, Wei-Li Patton, Henry Hubbard, Alun Lloyd Pape, T. Hsu, C.W. Schmidt, C. Johnson, Joel E. Torres, M.E. Andreassen, Karin Berndt, C. Bohrmann, G Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 |
description |
Source at: http://doi.org/10.1038/s41467-017-02550-9 Methane seepage from the upper continental slopes of Western Svalbard has previously been attributed to gas hydrate dissociation induced by anthropogenic warming of ambient bottom waters. Here we show that sediment cores drilled off Prins Karls Foreland contain freshwater from dissociating hydrates. However, our modeling indicates that the observed pore water freshening began around 8 ka BP when the rate of isostatic uplift outpaced eustatic sea-level rise. The resultant local shallowing and lowering of hydrostatic pressure forced gas hydrate dissociation and dissolved chloride depletions consistent with our geochemical analysis. Hence, we propose that hydrate dissociation was triggered by postglacial isostatic rebound rather than anthropogenic warming. Furthermore, we show that methane fluxes from dissociating hydrates were considerably smaller than present methane seepage rates implying that gas hydrates were not a major source of methane to the oceans, but rather acted as a dynamic seal, regulating methane release from deep geological reservoirs. |
format |
Article in Journal/Newspaper |
author |
Wallmann, Klaus Riedel, M. Hong, Wei-Li Patton, Henry Hubbard, Alun Lloyd Pape, T. Hsu, C.W. Schmidt, C. Johnson, Joel E. Torres, M.E. Andreassen, Karin Berndt, C. Bohrmann, G |
author_facet |
Wallmann, Klaus Riedel, M. Hong, Wei-Li Patton, Henry Hubbard, Alun Lloyd Pape, T. Hsu, C.W. Schmidt, C. Johnson, Joel E. Torres, M.E. Andreassen, Karin Berndt, C. Bohrmann, G |
author_sort |
Wallmann, Klaus |
title |
Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
title_short |
Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
title_full |
Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
title_fullStr |
Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
title_full_unstemmed |
Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming |
title_sort |
gas hydrate dissociation off svalbard induced by isostatic rebound rather than global warming |
publisher |
Nature Publishing Group |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/12571 https://doi.org/10.1038/s41467-017-02550-9 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_relation |
Nature Communications info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Wallmann, K., Riedel, M., Hong, W-L., Patton, H., Hubbard, A. L., Pape, T., . Bohrmann, G. (2018). Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming. Nature Communications, 9(83), 1-9. http://doi.org/10.1038/s41467-017-02550-9 FRIDAID 1539649 doi:10.1038/s41467-017-02550-9 2041-1723 https://hdl.handle.net/10037/12571 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1038/s41467-017-02550-9 |
container_title |
Nature Communications |
container_volume |
9 |
container_issue |
1 |
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1766300987555840000 |