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

Abstract : 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.
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Submitted on : Wednesday, May 27, 2009 - 4:41:34 PM
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Michel Magny, Jacques-Louis de Beaulieu, Ruth Drescher-Schneider, Boris Vannière, Anne-Véronique Walter-Simonnet, et al.. Climatic oscillation in central Italy during the Last Glacial-Holocene transition : the record from Lake Accesa.. Journal of Quaternary Science, Wiley, 2006, 21 (4), pp.311-320. ⟨10.1002/jqs.999⟩. ⟨hal-00388889⟩

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