Preboreal climate oscillations in Europe: Wiggle-match dating and synthesis of Dutch high-resolution multi-proxy records |
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| Institution: | 1. Adam Mickiewicz University, Institute of Geology, Faculty of Geographical and Geological Sciences, Maków Polnych 16, 61-606 Poznań, Poland;2. Department of Invertebrate Zoology and Hydrobiology, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland;3. Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom;4. University of Helsinki, Department of Geosciences and Geography, P.O. Box 64, FI-00014 Finland;5. University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40014 Jyväskylä, Finland;6. Adam Mickiewicz University, Department of Biogeography and Paleoecology, Faculty of Geographical and Geological Sciences, Dzi?gielowa 27, 61-606 Poznań, Poland;7. Institut des Sciences de l''Evolution, Université de Montpellier, CNRS, IRD, EPHE, Place Eugène Bataillon, 34095 Montpellier cedex 05, France;1. GEOTOP, Université du Québec à Montréal, CP 8888, Montréal, Québec H3C 3P8, Canada;2. Université de Bordeaux, EPOC, UMR 5805, F-33400 Talence, France |
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| Abstract: | In order to compare environmental and inferred climatic change during the Preboreal in The Netherlands, five terrestrial records were analysed. Detailed multi-proxy analyses including microfossils (e.g., pollen, spores, algae, and fungal spores), macroremains (e.g., seeds, fruits, wood, mosses, etc.), and loss on ignition measurements were carried out with high temporal resolution. To link the five Preboreal records, accurate chronologies were produced by AMS 14C wiggle-match dating. The Dutch records show that following the Lateglacial/Holocene climate warming, birch woodlands expanded between 11,530 and 11,500 cal BP during the Friesland Phase of the Preboreal. After the Friesland Phase, two distinct climatic shifts could be inferred: (1) around 11,430–11,350 cal BP the expansion of birch forests was interrupted by a dry continental phase with open grassland vegetation, the Rammelbeek Phase. This phase was coeval with the coldest part of the Preboreal oscillation (PBO) as observed in the δ18O record of the Greenland ice-core records and has been attributed to a large meltwater flux that resulted in a temporary decrease of the thermohaline circulation in the North Atlantic. (2) At the start of the Late Preboreal, between 11,270 and 11,210 cal BP, a sudden shift to a more humid climate occurred and birch forests expanded again. A simultaneous increase in the cosmogenic nuclides 14C and 10Be suggests that these changes in climate and vegetation were forced by a sudden decline in solar activity. Expansion of pine occurred during the later part of the Late Preboreal. At the onset of the Boreal, between 10,770 and 10,700 cal BP, dense woodlands with hazel, oak, elm and pine started to develop in The Netherlands. |
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