DISNAR , Jean-Robert

La séquence sédimentaire du lac Petit (Vallon des Millefonts, massif du Mercantour, France) a fourni un enregistrement sédimentaire et pollinique en continu sur les 5 derniers millénaires. Ce lac de surcreusement glaciaire (2200 m d'altitude) agit comme un piège naturel à sédiment et nous a permis d'étudier les différentes composantes...

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Edytem equipe 1 2003-2010

We report on the detection, in a sediment core drilled in Lake Le Bourget (French Alps), of a fossil molecule (miliacin) that was synthesized by broomcorn millet cultivated in the watershed, and then exported to the sediment. The variation in abundance of this molecule allows us reconstructing the history of millet cultivation around Lake Le...

High-resolution record of Holocene erosion patterns in a high altitude lake (Lake Anterne, NW French Alps): a witness of environmental changes, climatic variability and human activities

Prédire les impacts d'un probable Changement Global nécessite la compréhension des interactions passées entre le climat, les milieux et les sociétés. Les sédiments lacustres constituent de ce point de vue des archives de choix, à conditions de disposer de marqueurs univoques permettant de décrire l'évolution des variations du climat, des...

Numerous archaeological studies carried out in high-elevation areas of the Southern French Alps have documented ancient human occupation of mountains, mainly characterized by pastoral and mining activities. Besides, the area was affected by both continental and Mediterranean climate instability throughout the Holocene. Lake Petit, located in...

A high-resolution sedimentological and geochemical study was performed on a 20 m long core from the alpine Lake Anterne (2063 m a.s.l., NW French Alps) spanning the last 10 ka. Sedimentation is mainly of minerogenic origin. The organic matter quantity (TOC%) as well as its quality (hydrogen (HI) and oxygen (OI) indices) both indicate the...

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L'analyse multiproxies à haute résolution d'une séquence sédimentaire prélevée dans le Lac Petit (alt. 2 200 m, vallon des Millefonts, Mercantour, France) a permis d'étudier les interactions climat-environnement-Homme à l'Holocène récent en contexte de haute montagne dans les Alpes du Sud. Grâce aux analyses lithostratigraphiques, géochimiques...

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Mediterranean mountains are very sensitive geosystems to erosion processes. These environments combine three steep gradients: topographic, ecologic and climatic. They are extremely vulnerable to both anthropogenic and climate-driven global changes. We propose a multiproxy approach from sediments sequence of Petit Lake (2200m, Millefonts...