LATE PLEISTOCENE TO HOLOCENE CHANGES OF SURFACE WATER CIRCULATION IN THE CENTRAL NORTH ATLANTIC
Abstract
Distribution of ice-rafted debris (IRD) and calcium carbonate (CaCO3), as well as the data on dissolution of foraminiferal shells were studied in the AMK-4515 marine sediment core (central North Atlantic, Charlie-Gibbs Fracture Zone). The multiproxy approach made it possible to identify three intervals of surface circulation strengthening and weakening for the study area, corresponding to marine isotope stages (MIS) 1–3. The shift of the North Atlantic Polar front (PF) was also reconstructed. During the first climatic interval (78–64 cm, referred to MIS 3) the increased advection of North Atlantic water masses was recorded. The PF was located north of the study area. The second climatic interval (64–6 cm, MIS 2) is characterized by the southward migration of the PF and also includes two Heinrich events, accompanied by weakening surface circulation activity. During the Last Glacial Maximum (36–12 cm interval) the PF was located
south of the study area. The third climatic interval (6–0 cm, MIS 1) corresponds to the warm period: the PF was shifted far northward of the Charlie-Gibbs Fracture Zone; the Atlantic Meridional Overturning Circulation (AMOC) enhanced at that time; and the situation became similar to modern conditions.
About the Author
L. A. Kuleshova
Atlantic Branch of the P.P. Shirshov Institute of Oceanology of the Russian Academy of Sciences
Russian Federation
Russian Federation
Laboratory for Geology of Atlantic, Research Engineer
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Review
For citations:
Kuleshova L.A. LATE PLEISTOCENE TO HOLOCENE CHANGES OF SURFACE WATER CIRCULATION IN THE CENTRAL NORTH ATLANTIC. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2017;(3):80-86. (In Russ.)
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