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

• Published in: Quaternary Research
• Main Authors: Magny, Michel, Joannin, Sébastien, Galop, Didier, Vannière, Boris, Haas, Jean Nicolas, Bassetti, M., Bellintani, Paolo, Scandolari, Romana, Desmet, Marc
• Other Authors: Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC), Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124) (MSHE), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Géographie de l'environnement (GEODE), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Universität Innsbruck Innsbruck, Universita “La Sapienza” Roma (Istituto CNR), Università degli Studi di Roma "La Sapienza" = Sapienza University Rome (UNIROMA), Soprintendenza per i Beni Archeologici di trento, Museo delle Palafitte del Lago di Ledro, Musée de Ledro, Transferts continentaux : forçages anthropiques, climatiques et géodynamiques, Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), ANR-05-BLAN-0140,JCLAMA,Méthodes mixtes, visualisation et optimisation(2005)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: Mediterranean Lake-level fluctuations Lacustrine sediments Palaeohydrology Holocene; Mediterranean; Lake-level fluctuations; Lacustrine sediments; Palaeohydrology; Holocene; [SHS.ENVIR]Humanities and Social Sciences/Environmental studies; North Atlantic
• Online Access: https://hal.science/hal-00669616; https://hal.science/hal-00669616/document; https://hal.science/hal-00669616/file/Magny%20et%20al_%202012_cor.pdf; https://doi.org/10.1016/j.yqres.2012.01.005

International audience A lake-level record of Lake Ledro (northern Italy) spans the entire Holocenewith a chronology derived from51 radiocarbon dates. It is based on a specific sedimentological approach that combines data fromfive 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 Holocenewas punctuated by successive centennial-scale highstands. Correlations with the Preboreal oscillation and the 8.2 ka event, and comparisonwith 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.