The 4.2 ka event in the central Mediterranean: new data from a Corchia speleothem (Apuan Alps, central Italy)

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 (delta13C and delta18O) and trace elements (Mg, U, P, Y), with all proxies showing a coherent phase of reduced cave recharg...

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Bibliographic Details
Published in:Climate of the Past
Main Authors: Isola, Ilaria, Zanchetta, Giovanni, Drysdale, Russell, Regattieri, Eleonora, Bini, Monica, Bajo, Petra, Hellstrom, John C., Baneschi, Ilaria, Lionello, Piero, Woodhead, Jon, Greig, Alan
Other Authors: Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia, #PLACEHOLDER_PARENT_METADATA_VALUE#
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
speleothem
4.2 ka BP event
isotopes
trace elements
Paleoclima
Arctic
North Atlantic
North Atlantic oscillation
Online Access:http://hdl.handle.net/2122/12144
https://doi.org/10.5194/cp-15-135-2019
Description
Summary: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 (delta13C and delta18O) 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 configuration, are associated with cooler and wetter summers with reduced sea warming, which reduced the western Mediterranean evaporation during autumn–early winter, further reducing precipitation. ARCA project “Arctic: present climatic change and past extreme events” funded by the Italian Ministry of Education Universities and Research (MIUR); Australian Research Council Discovery Project DP160102969; Climate and alluvial event in Versilia: integration of Geoarcheological, Geomorphological, Geochemical data and numerical simulations Fondazione Cassa di Risparmio di Lucca; PRA-2018-41 Georisorse e Ambiente” funded by the University of Pisa Published 135-151 5A. Paleoclima e ricerche polari JCR Journal

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