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    Subpolar North Atlantic sea surface temperature since 6 ka BP: Indications of anomalous ocean-atmosphere interactions at 4-2 ka BP

    Orme, Lisa C. and Miettinen, Arto and Divine, Dmitry and Husum, Katrine and Pearce, Christof and Van Nieuwenhove, Nicolas and Born, Andreas and Mohan, Rahul and Seidenkrantz, Marit-Solveig (2018) Subpolar North Atlantic sea surface temperature since 6 ka BP: Indications of anomalous ocean-atmosphere interactions at 4-2 ka BP. Quaternary Science Reviews, 194. pp. 128-142. ISSN 0277-3791

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    Atmospheric circulation may change with future climate change in response to modification of meridional temperature gradients, but the potential influence on ocean circulation is as yet unclear. Over the mid-late Holocene, atmospheric circulation in the North Atlantic region has fluctuated on millennial timescales; therefore, the ocean response to these changes can be investigated using the paleoceanographic records that have been developed in the north-eastern subpolar North Atlantic. Here, we present a diatom-based sea surface temperature reconstruction from the Iceland Basin, south of Iceland; the reconstruction shows the warmest temperatures of the record at 6.1e4 ka BP, cooler temperatures at 4-2 ka BP and warmer temperatures thereafter. Inter-record comparisons indicate that the cold period at c. 4- 2 ka BP may have resulted from a strengthened East Greenland Current and/or melting of the Greenland ice sheet, in response to a negative North Atlantic Oscillation. The findings highlight that atmospheric circulation changes are likely to cause pronounced variations in the latitudinal exchange of heat, which may have consequences for deep-water formation and global ocean circulation.

    Item Type: Article
    Keywords: Holocene; Paleoceanography; Paleoclimatology; North Atlantic; Micropaleontology; Diatoms; Sedimentology-marine cores; North Atlantic oscillation; East Greenland current; Sea surface temperature;
    Academic Unit: Faculty of Social Sciences > Geography
    Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
    Item ID: 13151
    Identification Number:
    Depositing User: Lisa Orme
    Date Deposited: 31 Jul 2020 15:44
    Journal or Publication Title: Quaternary Science Reviews
    Publisher: Elsevier
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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