Climatic oscillation in central Italy during the Last Glacial-Holocene transition : the record from Lake Accesa.

• Published in: Journal of Quaternary Science
• Main Authors: Magny, Michel, de Beaulieu, Jacques-Louis, Drescher-Schneider, Ruth, Vannière, Boris, Walter-Simonnet, Anne-Véronique, Millet, Laurent, Bossuet, Gilles, Peyron, Odile
• Other Authors: Laboratoire de chrono-écologie - CNRS (UMR6565) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC), Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS), Institut für Pflanzenwissenschaften, Karl-Franzens-Universität Graz, ECLIPSE
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2006
• Subjects: Lateglacial; early Holocene; central Italy; vegetation history; fire frequency; lake-level fluctuations; [SDE.MCG]Environmental Sciences/Global Changes; ice core; North Atlantic
• Online Access: https://hal.science/hal-00388889; https://doi.org/10.1002/jqs.999

International audience This paper presents an event stratigraphy based on data documenting the history of vegetation cover, lake-level changes and fire frequency, as well as volcanic eruptions, over the Last Glacial-early Holocene transition from a terrestrial sediment sequence recovered at Lake Accesa in Tuscany (north-central Italy). On the basis of an age-depth model inferred from 13 radiocarbon dates and six tephra horizons, the Oldest Dryas-Bølling warming event was dated to ca. 14 560 cal. yr BP and the Younger Dryas event to ca. 12 700-11 650 cal. yr BP. Four sub-millennial scale cooling phases were recognised from pollen data at ca. 14 300-14 200, 13 900-13 700, 13 400-13 100 and 11 350-11 150 cal.yrBP. The last three may be Mediterranean equivalents to the Older Dryas (GI-1d), Intra-Allerød (GI-1b) and Preboreal Oscillation (PBO) cooling events defined from the GRIP ice-core and indicate strong climatic linkages between the North Atlantic and Mediterranean areas during the last Termination. The first may correspond to Intra-Bølling cold oscillations registered by various palaeoclimatic records in the North Atlantic region. The lake-level record shows that the sub-millennial scale climatic oscillations which punctuated the last deglaciation were associated in central Italy with different successive patterns of hydrological changes from the Bølling warming to the 8.2ka cold reversal.