MIDDLE PLEISTOCENE SEA-SURFACE PALAEOOCEANOLOGICAL CONDITIONS ON THE NORTHERN SEGMENT OF THE MOHN RIDGE (NORWEGIAN SEA) BASED ON DINOFLAGELLATE CYST ASSEMBLAGES

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Resumo

New paleoceanological data for the northern Norwegian Sea were obtained for the marine oxygen isotope stages (MIS) 8–6. Dinocyst analysis performed on the sediment core AMK-5536 showed local environments were formed in harsh conditions with probable presence of sea ice during cold MIS 8 and 6. In the warm MIS 7, a sharp increase in dinocyst concentrations, high species diversity, and the appearance of warm-water species with the presence of the typical species Spiniferites septentrionalis were noted. The optimum of MIS 7 corresponds to the time of 240–236 ka. The warming was short-lived and pronounced, with a greater influence of warm and saline surface North Atlantic waters than at present and a northward shift of the Arctic Front. The reconstructed surface water temperature was approximately 2.9–3.6°C higher than the modern one.

Sobre autores

T. Klyuvitkina

Lomonosov Moscow State University

Email: t.klyuvitkina@mail.ru
Moscow, Russia

E. Novichkova

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

A. Matul

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

R. Mohan

National Centre for Polar and Ocean Research

Vasco-da-Gama, India

M. Tiwari

National Centre for Polar and Ocean Research

Vasco-da-Gama, India

L. Lozinskaia

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

M. Kravchishina

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

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