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

QUATERNARY SCIENCE REVIEWS

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Article

Orme, Lisa Claire¹  Miettinen, Arto¹  Divine, Dmitry^1,2  Husum, Katrine¹  Pearce, Christof^3,4  Van Nieuwenhove, Nicolas⁵  Born, Andreas^6,7  Mohan, Rahul⁸  Seidenkrantz, Marit-Solveig^3,4 

[1] Norwegian Polar Res Inst, Fram Ctr, POB 6606 Langnes, N-9296 Tromso, Norway

[2] Arctic Univ Norway, Fac Sci & Technol, Dept Math & Stat, N-9037 Tromso, Norway

[3] Aarhus Univ, Arctic Res Ctr, Ctr Past Climate Studies, Hoegh Guldbergs Gade 2,Bldg 1672,213, DK-8000 Aarhus C, Denmark

[4] Aarhus Univ, Dept Geosci, IClimate, Hoegh Guldbergs Gade 2,Bldg 1672,213, DK-8000 Aarhus C, Denmark

[5] Univ New Brunswick, Dept Earth Sci, 2 Bailey Dr, Fredericton, NB E3B 5A3, Canada

[6] Univ Bergen, Dept Earth Sci, Postboks 7803, N-5020 Bergen, Norway

[7] Univ Bergen, Bjerknes Ctr Climate Res, Postboks 7803, N-5020 Bergen, Norway

[8] Govt India, Natl Ctr Antarctic & Ocean Res, Minist Earth Sci, Vasco Da Gama 403804, Goa, India

关键词: Holocene;    Paleoceanography;    Paleoclimatology;    North Atlantic;    Micropaleontology;    Diatoms;    Sedimentology-marine cores;    North Atlantic oscillation;    East Greenland current;    Sea surface temperature;   

DOI  :  10.1016/j.quascirev.2018.07.007

来源: Elsevier

【 摘 要 】

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 paleoceano-graphic 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 6.1-4 ka BP, cooler temperatures at 4-2 ka BP and warmer temperatures thereafter. Inter-record comparisons indicate that the cold period at c. 42 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. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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