Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57
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....
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.890469 2023-05-15T18:29:42+02:00 Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 Pape, Thomas Malnati, Janice Bohrmann, Gerhard LATITUDE: 78.552200 * LONGITUDE: 9.494200 * DATE/TIME START: 2016-08-20T07:46:00 * DATE/TIME END: 2016-09-02T07:11:00 2018-05-29 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.890469 https://doi.org/10.1594/PANGAEA.890469 en eng PANGAEA Riedel, Michael; Wallmann, Klaus; Berndt, Christian; Pape, Thomas; Freudenthal, Tim; Bergenthal, Markus; Bünz, Stefan; Bohrmann, Gerhard (2018): In situ temperature measurements at the Svalbard continental margin: Implications for gas hydrate dynamics. Geochemistry, Geophysics, Geosystems, 19(4), 1165-1177, https://doi.org/10.1002/2017GC007288 https://doi.pangaea.de/10.1594/PANGAEA.890469 https://doi.org/10.1594/PANGAEA.890469 CC-BY-NC-SA-3.0: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY-NC-SA Supplement to: Wallmann, Klaus; Riedel, Michael; Hong, W L; Patton, H; Hubbard, Alun L; Pape, Thomas; Hsu, Chieh-Wei; Schmidt, Christiane; Johnson, J E; Torres, Marta E; Andreassen, Karin; Berndt, Christian; Bohrmann, Gerhard (2018): Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming. Nature Communications, 9(1), https://doi.org/10.1038/s41467-017-02550-9 Center for Marine Environmental Sciences MARUM Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.890469 https://doi.org/10.1038/s41467-017-02550-9 https://doi.org/10.1002/2017GC007288 2023-01-20T07:34:09Z 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. Dataset Svalbard PANGAEA - Data Publisher for Earth & Environmental Science Svalbard ENVELOPE(9.494200,9.494200,78.552200,78.552200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Pape, Thomas Malnati, Janice Bohrmann, Gerhard Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
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 |
Dataset |
author |
Pape, Thomas Malnati, Janice Bohrmann, Gerhard |
author_facet |
Pape, Thomas Malnati, Janice Bohrmann, Gerhard |
author_sort |
Pape, Thomas |
title |
Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
title_short |
Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
title_full |
Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
title_fullStr |
Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
title_full_unstemmed |
Porosity and methane stable carbon isotope values of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57 |
title_sort |
porosity and methane stable carbon isotope values of mebo sediment cores from the continental margin off svalbard - cruise msm57 |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.890469 https://doi.org/10.1594/PANGAEA.890469 |
op_coverage |
LATITUDE: 78.552200 * LONGITUDE: 9.494200 * DATE/TIME START: 2016-08-20T07:46:00 * DATE/TIME END: 2016-09-02T07:11:00 |
long_lat |
ENVELOPE(9.494200,9.494200,78.552200,78.552200) |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Supplement to: Wallmann, Klaus; Riedel, Michael; Hong, W L; Patton, H; Hubbard, Alun L; Pape, Thomas; Hsu, Chieh-Wei; Schmidt, Christiane; Johnson, J E; Torres, Marta E; Andreassen, Karin; Berndt, Christian; Bohrmann, Gerhard (2018): Gas hydrate dissociation off Svalbard induced by isostatic rebound rather than global warming. Nature Communications, 9(1), https://doi.org/10.1038/s41467-017-02550-9 |
op_relation |
Riedel, Michael; Wallmann, Klaus; Berndt, Christian; Pape, Thomas; Freudenthal, Tim; Bergenthal, Markus; Bünz, Stefan; Bohrmann, Gerhard (2018): In situ temperature measurements at the Svalbard continental margin: Implications for gas hydrate dynamics. Geochemistry, Geophysics, Geosystems, 19(4), 1165-1177, https://doi.org/10.1002/2017GC007288 https://doi.pangaea.de/10.1594/PANGAEA.890469 https://doi.org/10.1594/PANGAEA.890469 |
op_rights |
CC-BY-NC-SA-3.0: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.1594/PANGAEA.890469 https://doi.org/10.1038/s41467-017-02550-9 https://doi.org/10.1002/2017GC007288 |
_version_ |
1766212997476253696 |