Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of Lake Ledro, northeastern Italy
Michel Magny
(1)
,
Sébastien Joannin
(1, 2, 3)
,
Didier Galop
(4)
,
Boris Vannière
(1)
,
Jean Nicolas Haas
(5)
,
M. Bassetti
(6)
,
Paolo Bellintani
(7)
,
Romana Scandolari
(8)
,
Marc Desmet
(9)
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
2 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
3 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
4 GEODE - Géographie de l'environnement
5 Universität Innsbruck [Innsbruck]
6 Istituto CNR - Universita “La Sapienza” Roma
7 Soprintendenza per i Beni Archeologici di trento
8 Museo delle Palafitte del Lago di Ledro
9 Transferts continentaux : forçages anthropiques, climatiques et géodynamiques
2 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
3 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
4 GEODE - Géographie de l'environnement
5 Universität Innsbruck [Innsbruck]
6 Istituto CNR - Universita “La Sapienza” Roma
7 Soprintendenza per i Beni Archeologici di trento
8 Museo delle Palafitte del Lago di Ledro
9 Transferts continentaux : forçages anthropiques, climatiques et géodynamiques
Michel Magny
- Fonction : Auteur
- PersonId : 5658
- IdHAL : michel-magny
- IdRef : 027001652
Sébastien Joannin
- Fonction : Auteur
- PersonId : 19986
- IdHAL : sebastien-joannin
- ORCID : 0000-0001-8345-9252
- IdRef : 11417038X
Didier Galop
- Fonction : Auteur
- PersonId : 13698
- IdHAL : didier-galop
- ORCID : 0000-0003-1746-4760
- IdRef : 035586850
Boris Vannière
- Fonction : Auteur
- PersonId : 170991
- IdHAL : boris-vanniere
- ORCID : 0000-0002-6779-6053
- IdRef : 22094850X
Marc Desmet
- Fonction : Auteur
- PersonId : 938023
- ORCID : 0000-0002-7580-1406
Résumé
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.
Domaines
Etudes de l'environnementFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of Lake Ledro, northeastern Italy
|
Résumé |
en
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.
|
Auteur(s) |
Michel Magny
1
, Sébastien Joannin
1, 2, 3
, Didier Galop
4
, Boris Vannière
1
, Jean Nicolas Haas
5
, M. Bassetti
6
, Paolo Bellintani
7
, Romana Scandolari
8
, Marc Desmet
9
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
( 57629 )
- 16, route de Gray - 25030 Besançon Cedex
- France
2
MSHE -
Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
( 2228 )
- 32-36, rue Mégevand 25030 BESANCON CEDEX
- France
3
LGL-TPE -
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
( 153787 )
- Université Claude Bernard, Lyon1 - Campus de la Doua, bâtiment Géode - 2, rue Raphaël Dubois - 69622 Villeurbanne Cedex
École Normale Supérieure de Lyon - 46, Allée d'Italie - 69364 Lyon cedex 07
Université Jean Monnet - Faculté des Sciences et Techniques - 23 rue du Dr Paul Michalon - 42023 Saint Étienne Cedex 02
UMR CNRS 5276
- France
4
GEODE -
Géographie de l'environnement
( 742 )
- 5 Allée Antonio Machado 31058 TOULOUSE CEDEX 1
- France
5
Universität Innsbruck [Innsbruck]
( 226037 )
- Innrain 52, 6020 Innsbruck
- Autriche
6
Istituto CNR -
Universita “La Sapienza” Roma
( 130464 )
- Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, Dipartimento di Chimica, Universita “La Sapienza”, P.le A. Moro 5, I-00185 Roma,
- Italie
7
Soprintendenza per i Beni Archeologici di trento
( 494731 )
- Italie
8
Museo delle Palafitte del Lago di Ledro
( 97258 )
- Italie
9
Transferts continentaux : forçages anthropiques, climatiques et géodynamiques
( 573104 )
- Faculté des Sciences et Techniques, Université François-Rabelais, Parc de Grandmont, 37200 Tours, France
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2012
|
Volume |
77
|
Numéro |
3
|
Page/Identifiant |
382-396
|
Domaine(s) |
|
Projet(s) ANR |
|
Mots-clés |
en
Mediterranean Lake-level fluctuations Lacustrine sediments Palaeohydrology Holocene, Mediterranean, Lake-level fluctuations, Lacustrine sediments, Palaeohydrology, Holocene
|
DOI | 10.1016/j.yqres.2012.01.005 |
Origine :
Accord explicite pour ce dépôt
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