Early Holocene terrestrial climatic variability along a North Atlantic Island transect: palaeoceanographic implications |
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| Institution: | 1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Rosneft Company, Sofiyskaya Naberezhnaya 26/1, Moscow, 117997, Russia;1. Department of Geography, Université de Montréal, Montréal, 520 Chemin de la Côte-Sainte-Catherine, Outremont, QC H2V 2B8, Canada;2. Center for Northern Studies, Université Laval, 2405, rue de la Terrasse, Québec, QC G1V 0A6, Canada;3. Geotop Research Centre on the Dynamics of the Earth System, Université du Québec à Montréal, 201 Avenue du Président-Kennedy, Montréal, QC H2X 3Y7, Canada;4. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, 14471 Potsdam, Germany;5. Institute of Northern Engineering, University of Alaska Fairbanks, 306 Tanana Loop, Fairbanks, AK 99775-5910, USA;1. Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences Building, Stony Brook, NY 11794-2100 USA;2. Department of Earth, Planetary, and Space Sciences, University of Calilfornia, Los Angeles, CA 90095-1567 USA |
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| Abstract: | A synthesis of the early Holocene climatic development in the North Atlantic region is presented, based on three previously published lake records from southern Greenland (Lake N14), Iceland (Lake Torfadalsvatn) and the Faroe Islands (Lake Lykkjuvøtn). The interval 11 500–8500 cal BP has been divided into five phases with respect to the inferred strength of the North Atlantic Current (NAC) and Irminger Currents (IC). Phase 1 (11 500–10 750 cal BP) was characterised by the first establishment of the NAC and IC in the vicinity of the studied sites, interrupted by the Preboreal Oscillation around 11 200 cal BP. Phase 2 (10 750–10 100 cal BP) was marked by a further warming step in southern Greenland rather concordant with a change into colder and more variable winters on the Faroe Islands. It is proposed that this could partly be related to a series of melt water outbursts disturbing the thermohaline circulation in the eastern Atlantic Ocean, resulting in a warming trend in the western region. During Phase 3 (10 100–9400 cal BP) the strength of the IC reaching northwestern Iceland intensified. A more stable regime in surface circulation was established at the onset of Phase 4 (9400–8900 cal BP) in southern Greenland and was followed by a change towards further warm conditions on Iceland at the onset of Phase 5 (8900–8500 cal BP). |
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