Multi‐proxy evidence for early to mid‐Holocene environmental and climatic changes in northeastern Poland |
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| Authors: | STEFAN LAUTERBACH ACHIM BRAUER NILS ANDERSEN DAN L DANIELOPOL PETER DULSKI MATTHIAS HÜLS KRYSTYNA MILECKA TADEUSZ NAMIOTKO BIRGIT PLESSEN ULRICH VON GRAFENSTEIN DECLAKES PARTICIPANTS |
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| Institution: | 1. Peter Dulski and Birgit Plessen, Deutsches GeoForschungsZentrum GFZ, Section 5.2 – Climate Dynamics and Landscape Evolution, Telegrafenberg, D‐14473 Potsdam, Germany;2. Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, University of Kiel, Max‐Eyth‐Strasse 11–13, D‐24118 Kiel, Germany;3. Austrian Academy of Sciences, Institute for Limnology, Mondseestrasse 9, A‐5310 Mondsee, Austria;4. Austrian Academy of Sciences, Commission for the Stratigraphical & Palaeontological Research of Austria, c/o Institute of Earth Sciences, Geology and Palaeontology, University of Graz, Heinrichstrasse 26, A‐8010 Graz, Austria;5. Adam Mickiewicz University, Faculty of Geographical and Geological Science, Department of Biogeography and Palaeoecology, ul. Dzi?gielowa 27, PL‐61‐680 Poznań, Poland;6. University of Gdańsk, Department of Genetics, Laboratory of Limnozoology, ul. K?adki 24, PL‐80‐822 Gdańsk, Poland;7. Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA‐CNRS, Orme des Merisiers, F‐91191 Gif‐sur‐Yvette, France;8. Soumaya Belmecheri (LSCE, Gif‐sur‐Yvette), Marc Desmet (ACCES‐INRP, Lyon), Helmut Erlenkeuser (Leibniz Laboratory, Kiel), Jér?me Nomade (LGCA, Grenoble) |
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| Abstract: | Lauterbach, S., Brauer, A., Andersen, N., Danielopol, D. L., Dulski, P., Hüls, M., Milecka, K., Namiotko, T., Plessen, B., von Grafenstein, U. & DecLakes participants 2010: Multi‐proxy evidence for early to mid‐Holocene environmental and climatic changes in northeastern Poland. Boreas, 10.1111/j.1502‐3885.2010.00159.x. ISSN 0300‐9483. We investigated the sedimentary record of Lake Hańcza (northeastern Poland) using a multi‐proxy approach, focusing on early to mid‐Holocene climatic and environmental changes. AMS 14C dating of terrestrial macrofossils and sedimentation rate estimates from occasional varve thickness measurements were used to establish a chronology. The onset of the Holocene at c. 11 600 cal. a BP is marked by the decline of Lateglacial shrub vegetation and a shift from clastic‐detrital deposition to an autochthonous sedimentation dominated by biochemical calcite precipitation. Between 10 000 and 9000 cal. a BP, a further environmental and climatic improvement is indicated by the spread of deciduous forests, an increase in lake organic matter and a 1.7‰ rise in the oxygen isotope ratios of both endogenic calcite and ostracod valves. Rising δ18O values were probably caused by a combination of hydrological and climatic factors. The persistence of relatively cold and dry climate conditions in northeastern Poland during the first one and a half millennia of the Holocene could be related to a regional eastern European atmospheric circulation pattern. Prevailing anticyclonic circulation linked to a high‐pressure cell above the retreating Scandinavian Ice Sheet might have blocked the influence of warm and moist Westerlies and attenuated the early Holocene climatic amelioration in the Lake Hańcza region until the final decay of the ice sheet. |
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