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Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of lake ledro, northeastern Italy

Published online by Cambridge University Press:  20 January 2017

Michel Magny ,
Sébastien Joannin ,
Didier Galop ,
Boris Vannière ,
Jean Nicolas Haas ,
Michele Bassetti ,
Paolo Bellintani ,
Romana Scandolari  and
Marc Desmet
Michel Magny*
Affiliation:
Laboratoire de Chrono-Environnement, UMR 6249 du CNRS, UFR des Sciences et Techniques, 16 route de Gray, 25 030 Besançon, France
Sébastien Joannin
Affiliation:
Laboratoire de Chrono-Environnement, UMR 6249 du CNRS, UFR des Sciences et Techniques, 16 route de Gray, 25 030 Besançon, France
Didier Galop
Affiliation:
GEODE, UMR 5602 (CNRS), University of Toulouse 2, 5, Allées A. Machado, Allées A. Machado, 31058 Toulouse, France
Boris Vannière
Affiliation:
Laboratoire de Chrono-Environnement, UMR 6249 du CNRS, UFR des Sciences et Techniques, 16 route de Gray, 25 030 Besançon, France
Jean Nicolas Haas
Affiliation:
Department of Botany, University of Innsbruck, Sternwartestrasse 15, 6020 Innsbruck, Austria
Michele Bassetti
Affiliation:
CORA Ricerche Archeologiche, via Salisburgo 16, I-38100 Trento, Italy
Paolo Bellintani
Affiliation:
Soprintendenza per i Beni Archeologici, Provincia Autonoma di Trento, via Aosta 1, 38100 Trento, Italy
Romana Scandolari
Affiliation:
Museo delle Palafitte del Lago di Ledro, Via Lungolago 1, 38060 Molina di Ledro, Italy
Marc Desmet
Affiliation:
CNRS-UMR 6113, ISTO Orléans/Tours, UFR Sciences & Techniques, Université François Rabelais, Parc de Grandmont, F-37200 Tours, France
*
*Corresponding author. E-mail address:michel.magny@univ-fcomte.fr (M. Magny).
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Abstract

A lake-level record of Lake Ledro (northern Italy) spans the entire Holocene with a chronology derived from 51 radiocarbon dates. It is based on a specific sedimentological approach that combines data from five sediment profiles sampled in distinct locations in the littoral zone. On a millennial scale, the lake-level record shows two successive periods from 11,700 to 4500 cal yr BP and from 4500 cal yr BP to the present, characterized by lower and higher average lake levels, respectively. In addition to key seasonal and inter-hemispherical changes in insolation, the major hydrological change around 4500 cal yr BP may be related to a non-linear response of the climate system to orbitally-driven gradual decrease in insolation. The Ledro record questions the notion of an accentuated summer rain regime in the northern Mediterranean borderlands during the boreal insolation maximum. Moreover, the Ledro record highlights that the Holocene was punctuated by successive centennial-scale highstands. Correlations with the Preboreal oscillation and the 8.2 ka event, and comparison with the atmospheric 14C residual record, suggest that short-lived lake-level fluctuations developed at Ledro in response to (1) final steps of the deglaciation in the North Atlantic area and (2) variations in solar activity.

Keywords

MediterraneanLake-level fluctuationsLacustrine sedimentsPalaeohydrologyHolocene
Type
Original Articles
Information
Quaternary Research , Volume 77 , Issue 3 , May 2012 , pp. 382 - 396
Copyright
University of Washington

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