Atlantic surface water inflow to the Nordic seas during the Pleistocene-Holocene transition (mid-late Younger Dryas and Pre-Boreal periods, 12 450-10 000 a BP)

Tine L. Rasmussen, Erik Thomsen, Tove Nielsen, Stefan Wastegård

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

19 Citationer (Scopus)

Abstrakt

The inflow of Atlantic Water to the Nordic seas from mid-late Younger Dryas to earliest Holocene (12 450-10 000 a BP) is reconstructed on the basis of a high-resolution core (LINK14) from 346m water depth on the east Faroe shelf. We have analysed the distribution of planktic and benthic foraminifera, stable isotopes and ice-rafted debris (IRD), and calculated absolute temperatures and salinities by transfer functions. During the investigated time period there was almost continuous inflow of Atlantic Water to the Nordic seas. Deposition of IRD during the mid-late Younger Dryas and Pre-Boreal coolings indicates the presence of melting icebergs and that summer sea surface temperatures were low. The east-west temperature gradient across the Faroe-Shetland Channel was much steeper than today. The cold conditions around the Faroe Islands are attributed to stronger East Greenland and East Icelandic currents than at present. The near-continuous inflow of Atlantic Water is consistent with published evidence suggesting that deep convection took place in the Nordic seas, although the convection sites probably had shifted to a more easterly position than at present. Around the time of deposition of the Saksunarvatn Tephra c. 10 350 a BP, sea surface temperatures increased to the present level.

OriginalsprogEngelsk
Sider (fra-til)723-733
Antal sider11
TidsskriftJournal of Quaternary Science
Vol/bind26
Udgave nummer7
DOI
StatusUdgivet - okt. 2011

Programområde

  • Programområde 5: Natur og klima

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