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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Abstract

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.

About the authors

T. S Klyuvitkina

Lomonosov Moscow State University

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

E. A Novichkova

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

A. G 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. A Lozinskaia

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

M. D Kravchishina

Shirshov Institute of Oceanology of Russian Academy of Sciences

Moscow, Russia

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