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Oceanology

, Volume 54, Issue 6, pp 798–807 | Cite as

Migrations of the North Atlantic Polar front during the last 300 ka: Evidence from planktic foraminiferal data

  • L. D. BashirovaEmail author
  • E. S. Kandiano
  • V. V. Sivkov
  • H. A. Bauch
Marine Geology
  • 156 Downloads

Abstract

The main migrations of the Polar front (PF) during the last 300 ka were identified using planktic foraminiferal census data and derived from them sea surface paleotemperature (SST) estimates in two synchronized AMK-4438 and M23414 cores recovered directly beneath the main stream of the North Atlantic Current (NAC) south of Iceland. During the summer seasons, the cold waters adjacent to the PF did not reach the studied sites. These waters occurred here only during the winter seasons of MIS 2, 6, and 8. The northern part of the study area was influenced by the arctic waters more often than its southern part. During MIS 8 and 6 isotherms in the North Atlantic had mainly the subzonal orientation, while during MIS 2–4 they had the submeridional orientation. During the interglacials, the PF was located northward and westward from the study area. During MIS 7, the front was presumably situated closer to the study area in comparison with its modern position, and the isotherms were oriented mainly subzonal. For the MIS 5e period, we observed the most distant retreat of PF from the investigated area in the western and northwestern direction in relation to the anomalous deflection of the NAC to the north-west (intensification of the Irminger current) and the predominance of the submeridional orientation of the isotherms in the study area. During MIS 1, as well as MIS 7, the isotherms in the study area had mainly the subzonal orientation.

Keywords

Polar Front Marine Isotope Stage North Atlantic Current Modern Analog Technique M23414 Core 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Inc. 2014

Authors and Affiliations

  • L. D. Bashirova
    • 1
    • 2
    Email author
  • E. S. Kandiano
    • 3
  • V. V. Sivkov
    • 1
    • 2
  • H. A. Bauch
    • 4
  1. 1.P.P. Shirshov Institute of Oceanology, Atlantic BranchRussian Academy of SciencesKaliningradRussia
  2. 2.Immanuel Kant Baltic Federal UniversityKaliningradRussia
  3. 3.Research Center for Marine GeosciencesGEOMAR-University of KielKielGermany
  4. 4.Mainz Academy of Sciences, Humanities, and LiteratureMainzGermany

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