Late Pleistocene spread of (cool-)temperate forests in Northeast China and climate changes synchronous with the North Atlantic region |
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| Authors: | Martina Stebich Jens Mingram Jingtai Han Jiaqi Liu |
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| Institution: | 1. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China;2. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;3. MOE Key Laboratory of Western China''s Environmental System, College of Earth Environmental Sciences, Lanzhou University, Lanzhou 730000, China;4. GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker Weg 20, 24105 Kiel, Germany;5. Institut für Geowissenschaften, Universität Kiel, Ludewig-Meyn-Str. 10, D-24118 Kiel, Germany;6. Universität Kiel, 24118 Kiel, Germany;1. Department of Geography, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany;2. Lower Saxony Institute for Historical Coastal Research, Viktoriastraße 26/28, 26382 Wilhelmshaven, Germany;3. Department of Palynology and Climate Dynamics, Georg-August-Universität Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany;4. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany;5. Faculty of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland;6. Department of Geography, Johannes Gutenberg-Universität Mainz, Becherweg 21, 55128 Mainz, Germany;7. Department of Botany, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan;8. Energy and Climate Change Division, Global Energy Interconnection Development and Cooperation Organization, 8 Inner Xuanwumen Str., 100031 Beijing, China;9. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, 73 East Beijing Rd., 210008 Nanjing, China |
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| Abstract: | The results presented here from the annually laminated sedimentary sequence of Sihailongwan lake provide the first comprehensive palaeoecological record covering the Late Pleniglacial to the Early Holocene (16,700–10,600 cal yrs. BP) from Northeast China. High-resolution pollen analyses have enabled the vegetational and climatic changes of the last glacial-interglacial transition to be reconstructed in more detail than has been previously possible. Moreover, a reliable chronology has been provided by both varve counting and 40 calibrated AMS 14C age determinations.Palaeobotanical evidence indicates predominantly steppe and open taiga-like woodland communities, with abundant Betula, Larix, Alnus fruticosa, Artemisia, grasses and sedges, which are typical of cold and dry conditions between 16,700 and 14,450 cal yrs. BP. The beginning expansion of Ulmus and Fraxinus marks the onset of the Late-glacial climatic amelioration at 14,450 cal yrs. BP. Dense deciduous forests, predominantly consisting of thermophilous broadleaf taxa, become established and widespread during the Early Holocene.Two short-term climatic reversals to colder and/or dryer conditions are recorded in the proxy data between 13,900 and 13,800 cal yrs. BP and 13,100 and 12,900 cal yrs. BP, correlating with the Oldest Dryas/Greenland Interstadial (GI) 1d event and the Gerzensee/Killarney/GI-1b oscillation, respectively. The prominent reappearance of Picea and Larix, coupled with a marked decrease in broadleaved trees, prior to the start of the Holocene, implies a climatic reversal compatible with the Younger Dryas event in the circum-Atlantic region. The evident synchroneity of climate changes in the North Atlantic region and East Asia supports the theory of strong atmospheric coupling between both regions. |
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