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Discussion papers | Copyright
https://doi.org/10.5194/cp-2018-127
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Oct 2018

Research article | 10 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

The 4.2 ka BP event in the Central Mediterranean: New data from Corchia speleothems (Apuan Alps, central Italy)

Ilaria Isola1, Giovanni Zanchetta1,2, Russell N. Drysdale3, Eleonora Regattieri2,3, Monica Bini1,2, Petra Bajo4, John C. Hellstrom4, Ilaria Baneschi5, Piero Lionello6, Jon Woodhead4, and Alan Greig4 Ilaria Isola et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Pisa and Rome, Italy
  • 2Dipartimento di Scienze della Terra, University of Pisa, Italy
  • 3School of Geography, University of Melbourne, Australia
  • 4School of Earth Sciences, University of Melbourne, Australia
  • 5Istituto di Geoscience e Georisorse-CNR, Pisa, Italy
  • 6Dipartimento Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, Lecce, Italy

Abstract. We present new data on the 4.2ka BP event in the central Mediterranean from Corchia Cave (Tuscany, central Italy) stalagmite CC27. The stalagmite was analysed for stable isotopes (δ13C δ18O) and trace elements (Mg, U, P, Y), with all proxies showing a coherent phase of reduced cave recharge between ca. 4.5 and 4.1ka. Based on the current climatological data on cyclogenesis, the reduction in cave recharge is considered associated to weakening of the cyclone centre located in the Gulf of Genoa in response to reduced advection of air masses from Atlantic during winter. These conditions, which closely resemble a positive North Atlantic Oscillation (NAO)-like 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.

Ilaria Isola et al.
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To understand the natural variability in the climate system, the hydrological aspect (dry/wet conditions) is particularly important for its impact on our societies. The reconstruction of past precipitation regimes can provide a useful tool for forecast of future climate changes. We use multi-proxy time series (oxygen and carbon isotopes and trace-elements) from speleothems to investigate the circulation pattern variations and seasonality effects during the dry 4.2 ka BP event in central Italy.
To understand the natural variability in the climate system, the hydrological aspect (dry/wet...
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