Multi-proxy evidence for early to mid-Holocene environmental and climatic changes in northeastern Poland

• Published in: Boreas
• Main Authors: Lauterbach, Stefan, Brauer, Achim, Andersen, Nils, Danielopol, Dan L., Dulski, Peter, Hüls, Matthias, Milecka, Krystyna, Namiotko, Tadeusz, Plessen, Birgit, von Grafenstein, Ulrich, Belmecheri, Soumaya, Desmet, Marc, Erlenkeuser, Helmut, Nomade, Jérôme
• Other Authors: German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-University, Commission for the Stratigraphical and Palaeontological Research of Austria (CPSA), Austrian Academy of Sciences (OeAW), Institute for Limnology, Department of Biogeography and Palaeoecology, Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań (UAM), Laboratory of Limnozoology, Department of Genetics, University of Gdańsk (UG), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Géochrononologie Traceurs Archéométrie (GEOTRAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Erté Acces, INRP, Tectonique reliefs et bassins, Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), Funded by DFG (Germany, project no. BR2208/2-2, AN554/1-2), FWF (Austria, project no. I35-B06) and CNRS (France)., European Project:
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2011
• Subjects: [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology; Ice Sheet
• Online Access: https://insu.hal.science/insu-00680882; https://doi.org/10.1111/j.1502-3885.2010.00159.x

Declakes participants : Soumaya Belmecheri, Marc Desmet, Helmut Erlenkeuser, Jérôme Nomade. International audience 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.