Climatic bisection of the last interglacial warm period in the Polar North Atlantic |
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| Authors: | Henning A Bauch Evguenia S Kandiano Jan Helmke Nils Andersen Antoni Rosell-Mele Helmut Erlenkeuser |
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| Institution: | 1. Department of Environmental Physics and Meteorology, National and Kapodistrian University of Athens, Athens, Greece;2. Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, Moscow, Russia;1. Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Córdoba, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de Investigaciones en Ciencias de la Tierra, (CICTERRA). Av. Vélez Sársfield 1611, Edificio CICTERRA, X5016CGA, Ciudad Universitaria, Córdoba, Argentina;3. Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, Comodoro Rivadavia, Argentina |
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| Abstract: | New multiproxy marine data of the Eemian interglacial (MIS5e) from the Norwegian Sea manifest a cold event with near-glacial surface ocean summer temperatures (3–4 °C). This mid-Eemian cooling divided the otherwise relatively warm interglacial climate and was associated with widespread expansions of winter sea-ice and polar water masses due to changes in atmospheric circulation and ocean stability. While the data also verify a late rather than early last interglacial warm peak, which is in general disharmony with northern hemisphere insolation maximum and the regional climatic progression of the early Holocene, the cold event itself was likely instrumental for delaying the last interglacial climate development in the Polar North when compared with regions farther south. Such a ‘climatic decoupling’ of the Polar region may bear profound implications for the employment of Eemian conditions to help evaluate the present and future state of the Arctic cryosphere during a warming interglacial. |
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