dc.contributor.author | Rasmussen, Tine Lander | |
dc.contributor.author | el Bani Altuna, Naima | |
dc.contributor.author | Thomsen, Erik | |
dc.date.accessioned | 2024-10-08T06:52:55Z | |
dc.date.available | 2024-10-08T06:52:55Z | |
dc.date.issued | 2024-09-27 | |
dc.description.abstract | During the last glaciation, the northern hemisphere experienced profound millennial-scale changes
(termed Dansgaard-Oeschger (DO) events) in atmospheric and oceanic temperatures. In the North
Atlantic, the fluctuations resulted in extremely unstable bottom water conditions with bottom water
temperatures (BWT) varying up to > 5 °C. We have studied these changes in a core from 1,300 m water
depth atVestnesa Ridge, northwestern Svalbard margin to investigate a possible connection between
BWT and seepage of methane from the seafloor covering the period ~ 50–6 ka. BeneathVestnesa
Ridge, gas hydrates containing vast amounts of methane are kept stable due to the high pressure and
low temperatures. Release of gas is shown by numerous pockmarks on the seafloor.The pockmarks at
1,300 m water depth are presently inactive, but they bear witness of earlier activity. Our study shows
that from ~ 50–6 ka, the core site experienced repeated increases in BWT and in the emissions of gas,
both following the pattern of the DO events.This correspondence in time scale indicates that BWT was
the primary forcing factor for the variability in methane release. However, the releases were delayed
by up to > 1,000 years compared to the initial increase in BWT. | en_US |
dc.identifier.citation | Rasmussen TLR, el Bani Altuna N, Thomsen E. Variations in deep-sea methane seepage linked to millennial-scale changes in bottom water temperatures ~ 50–6 ka, NW Svalbard margin. Scientific Reports. 2024;24 | en_US |
dc.identifier.cristinID | FRIDAID 2307512 | |
dc.identifier.doi | 10.1038/s41598-024-72865-3 | |
dc.identifier.issn | 2045-2322 | |
dc.identifier.uri | https://hdl.handle.net/10037/35104 | |
dc.language.iso | eng | en_US |
dc.publisher | Springer Nature | en_US |
dc.relation.journal | Scientific Reports | |
dc.rights.accessRights | openAccess | en_US |
dc.rights.holder | Copyright 2024 The Author(s) | en_US |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0 | en_US |
dc.rights | Attribution 4.0 International (CC BY 4.0) | en_US |
dc.title | Variations in deep-sea methane seepage linked to millennial-scale changes in bottom water temperatures ~ 50–6 ka, NW Svalbard margin | en_US |
dc.type.version | publishedVersion | en_US |
dc.type | Journal article | en_US |
dc.type | Tidsskriftartikkel | en_US |
dc.type | Peer reviewed | en_US |