Show simple item record

dc.contributor.authorRasmussen, Tine Lander
dc.contributor.authorThomsen, Erik
dc.contributor.authorNielsen, Tove
dc.date.accessioned2018-02-09T09:31:09Z
dc.date.available2018-02-09T09:31:09Z
dc.date.issued2014
dc.description.abstractThe climate of the last glaciation circa 65,000–25,000 years ago was interrupted by about 15 abrupt temperature fluctuations, the so-called Dansgaard-Oeschger events consisting of warm interstadials and cold stadials recorded in Greenland ice cores. The largest fluctuations occur in the North Atlantic region, but they have been registered over the most of the world. The events are linked to changes in deep water formation in the Nordic seas and North Atlantic, disrupting the thermo haline circulation. Yet, Dansgaard-Oeschger events have so far not been recorded north of the convection areas in the central Nordic seas, and it is not known if they affected the water exchange between the Nordic seas and the Arctic Ocean. In this study, we analyze core JM05-31GC from the northern Fram Strait at the very entrance to the Arctic Ocean. The core contains sediments from marine isotope stages (MISs) 4–2. The results show millennial timescale shifts in all the investigated proxies including the distribution of planktonic and benthic foraminifera, planktonic and benthic oxygen and carbon isotopes, and several sedimentological parameters. In JM05-31GC, the interstadials are characterized by relatively high surface and low bottom water temperatures, low content of ice-rafted debris, and well-ventilated bottom water. Stadials are characterized by the presence of icebergs and decreasing surface water and increasing bottom water temperatures due to increased inflow of Atlantic subsurface water. Ventilation decreased during Heinrich events and mo st stadials. The results show that the Dansgaard- Oeschger events strongly affected the water exchange between the Nordic seas and the Arctic Ocean.en_US
dc.identifier.citationRasmussen, T.L.R., Thomsen, E., Nielsen, T. Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2. Geochemistry Geophysics Geosystems. 2014;15:530-544en_US
dc.identifier.cristinIDFRIDAID 1097485
dc.identifier.doi10.1002/2013GC005020
dc.identifier.issn1525-2027
dc.identifier.urihttps://hdl.handle.net/10037/12110
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.journalGeochemistry Geophysics Geosystems
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGEen_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.titleWater mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2en_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record