Publication Date:
2019-01-29
Description:
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.
Description:
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
Description:
Published
Description:
135-151
Description:
5A. Paleoclima e ricerche polari
Description:
JCR Journal
Keywords:
speleothem
;
4.2 ka BP event
;
isotopes
;
trace elements
;
Paleoclima
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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