Journal article
The 4.2 ka event in the central Mediterranean: New data from a Corchia speleothem (Apuan Alps, central Italy)
I Isola, G Zanchetta, RN Drysdale, E Regattieri, M Bini, P Bajo, JC Hellstrom, I Baneschi, P Lionello, J Woodhead, A Greig
Climate of the Past | COPERNICUS GESELLSCHAFT MBH | Published : 2019
Abstract
We present new data on the 4.2 ka event in the central Mediterranean from Corchia Cave (Tuscany, central Italy) stalagmite CC27. The stalagmite was analyzed for stable isotopes (δ 13 C and δ 18 O) and trace elements (Mg, U, P, Y), with all proxies showing a coherent phase of reduced cave recharge between ca. 4.5 and 4.1 ka BP. Based on the current climatological data on cyclogenesis, the reduction in cave recharge is considered to be associated with the weakening of the cyclone center located in the Gulf of Genoa in response to reduced advection of air masses from the Atlantic during winter. These conditions, which closely resemble a positive North Atlantic Oscillation (NAO) type of configur..
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Grants
Awarded by Fondazione Cassa di Risparmio di Lucca
Funding Acknowledgements
We would like to thank two anonymous reviewers for their comments on this paper and helpful suggestions for improvements. We thank the Federazione Speleologica Toscana and Parco Regionale delle Alpi Apuane for supporting our work on Apuane speleothems. The analytical work presented here has been funded by the Australian Research Council Discovery Project DP160102969 awarded to Russell N. Drysdale, Giovanni Zanchetta, Eleonora Regattieri and John C. Hellstrom, and it is part of the ARCA project "Arctic: present climatic change and past extreme events" funded by the Italian Ministry of Education, Universities and Research (MIUR) awarded to Ilaria Isola. Part of this study has been developed within the framework of the project "Climate and alluvial event in Versilia: integration of Geoarcheological, Geomorphological, Geochemical data and numerical simulations" awarded to MB and funded by the Fondazione Cassa di Risparmio di Lucca. It is also part of "PRA-2018-41 Georisorse e Ambiente" funded by the University of Pisa.