A5026212146- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Geological formations and processes
- Aeolian processes and effects
- Tree-ring climate responses
- Geological and Geophysical Studies Worldwide
- Archaeology and ancient environmental studies
- Soil erosion and sediment transport
- Landslides and related hazards
- Archaeological and Geological Studies
- Paleontology and Stratigraphy of Fossils
- Mediterranean and Iberian flora and fauna
- Isotope Analysis in Ecology
- Flood Risk Assessment and Management
- Cryospheric studies and observations
- Maritime and Coastal Archaeology
- Coastal wetland ecosystem dynamics
- Marine and coastal plant biology
- French Urban and Social Studies
- Psychoanalysis and Psychopathology Research
- Image Processing and 3D Reconstruction
- Marine and environmental studies
- Geological Modeling and Analysis
- Soil and Environmental Studies
- Archaeological and Historical Studies
Centre National de la Recherche Scientifique
2013-2025
Institut de Recherche pour le Développement
2015-2025
Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale
2013-2024
Aix-Marseille Université
2014-2024
University of Arizona
2020
Université d'Avignon et des Pays de Vaucluse
2015-2020
Institut de l'Information Scientifique et Technique
2020
Environnements et Paléoenvironnements Océaniques et Continentaux
2015
Laboratoire Méditerranéen de Préhistoire Europe Afrique
2010-2014
Sustainable Europe Research Institute
2013
A 144-cm-long core was obtained in Lake Petit (2200 m a.s.l., Mediterranean French Alps) order to reconstruct past interactions between humans, the environment and climate over last five millennia using a multidisciplinary approach involving sedimentological, geochemical botanical analyses. We show complex pattern of environmental transformation. From 4800 4200 cal. BP, podzol-type soils progressively developed under forest cover. This stable situation interrupted by major detrital pulse at...
We present new 14C results measured on subfossil Scots Pines recovered in the eroded banks of Drouzet watercourse Southern French Alps. About 400 ages have been analysed 15 trees sampled at annual resolution. The resulting Δ14C record exhibits an abrupt spike occurring a single year 14 300-14 299 cal yr BP and century-long event between 13.9 kyr BP. In order to identify causes these events, we compare with simulations based 10Be Greenland ice used as input carbon cycle model. correspondence...
Abstract The AixMICADAS facility is in part dedicated to research on radiocarbon ( 14 C) calibration by means of various archives. For this purpose, we are improving upon the capacity accurately date subfossil wood. In current study, nine chemical pretreatment protocols tested six wood samples known ages. optimization based C ages, 13 C/ 12 ratios, carbon % and overall mass yield leads us favor acid-base-acid-bleaching (ABA-B). This efficient method shown provide a residue holocellulose with...
Abstract Understanding the role of climate and humans in generating mountain slope instability is crucial because such influences downstream fluvial activity a major threat to societies. Here, we use sedimentary archive Lake Allos (southeastern France), lake European Alps, characterize flood deposits vegetation dynamics over past 7000 yr. Our results support interpretation critical threshold catchment sensitivity erosion at 1700 calibrated (cal.) yr B.P. (A.D. 250) probably resulting from...
ABSTRACT Subfossil trees with their annual rings constitute the most accurate and precise archive to calibrate radiocarbon ( 14 C) method. The Holocene part of IntCal curve is based on tree-ring chronologies, absolutely dated by dendrochronological matching. For Northern Hemisphere, absolute starts at 12,325 cal BP. early Younger Dryas (YD) climatic event (≈ 12,850–11,650 BP), there are only a few floating sequences, mainly from Switzerland France. We present new C results subfossil Pinus...
The longest absolute tree-ring chronology is extended by the Swiss Late Glacial back to about 14 000 BP (years before 1950) with an uncertainty of only 8 years (2-sig, Reinig 2020). Recently published chronologies from Southern France (Bard et al. 2023) extend throughout Older Dryas further 350 BP. However, accurate placement mid-resolution (1yr ever 3yr) French radiocarbon so far not available and purely base on low-resolution measurements.By performing stable isotope (δ18O...
Abstract Aim Previous studies have failed to reconstruct the regional post‐glacial migration pattern of Abies alba in southern France. Based on first exhaustive compilation palaeoecological data this region, we present state‐of‐the‐art and attempt synthesize available information concerning glacial refugia migration, analyse with regard climate orography. Location South‐western Alps adjacent areas, Methods The work compiles south‐western (52 sites, 290 radiocarbon dates). is reconstructed...
Abstract. In the Mediterranean area, 4.2 ka BP event is recorded with contrasting expressions between regions. southern Alps, high-altitude Lake Petit (Mercantour Massif, France; 2200 m a.s.l.) offers pollen and diatom-rich sediments covering last 4800 years. A multi-proxy analysis recently revealed a detrital pulse around 4200 cal due to increasing erosion in lake catchment. The involvement of rapid climate change leading runoff soil was proposed. Here, order clarify this hypothesis, we...
The purpose of this paper is to analyze the numerous holocene subfossil trees ( Pinus silvestris ) buried in alluvial deposits Southern French Alps. These lived between Allerød and Subboreal periods, according 14 C dates. Our dendochronological studies explain trees' sudden death as due morphological crisis brought on by climatic oscillations. Tree-ring series could be used identify variability early Holocene atmospheric levels.
L'évolution historique des lits fluviaux de la moyenne Durance (Sud-Est France) est étudiée à partir documents d'archives (textes et cartes anciennes), séries diachroniques photographies aériennes d'analyses sédimentologiques dépôts plaine alluviale. La richesse l'information recueillie a permis retracer l'évolution rivière au XIX e XX siècle : diminution fréquence crues, contraction fluviaux, incision. Lors périodes antérieures, il semble que phases forte activité morphodynamique...
The Roman and early medieval Richeaume XIII necropolis in Provence (France) was systematically studied using magnetic prospection electrical resistivity tomography (ERT). Remains of a limestone-made building are embedded reddish clay formation bearing iron oxides. This produces an interesting negative anomaly, whereas the wall itself is resistive. Other dipolar anomalies correlated with location sepulchres, either covered by roman, strongly magnetized tegulae, or corresponding to burnt...
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 l'Holocène récent en contexte de montagne Alpes du Sud. Grâce aux analyses lithostratigraphiques, géochimiques et palynologiques, trois grandes phases ont pu être reconstituées : (1) une période stabilité relative l'écosystème 4 750 350 cal. BP, caractérisée par sédimentation...
Sediments from Lake Petit (2200 m a.s.l., Southern Alps) are particularly relevant for analysis of coupled landscape palaeoecology and palaeolimnology. Diatom assemblages, organic matter composition sediments (total nitrogen carbon) Pediastrum boryanum concentrations were obtained a 144-cm-long core, enabling the reconstruction aquatic ecosystem over nearly last 5000 cal. BP. From 4800 to 4300 BP, was stable diatom-productive water body dominated by alkaliphilous diatoms ( Staurosirella...
Abstract Nearly 13,000 years ago, the warming trend into Holocene was sharply interrupted by a reversal to near glacial conditions. Climatic causes and ecological consequences of Younger Dryas (YD) have been extensively studied, however proxy archives from Mediterranean basin capturing this period are scarce do not provide annual resolution. Here, we report hydroclimatic reconstruction stable isotopes (δ 18 O, δ 13 C) in subfossil pines southern France. Growing before during transition YD...
Résumé L'étude de l'évolution historique des lits fluviaux réalisée à l'aide documents cartographiques et photographiques ainsi que le recensement la fréquence crues rivière, permettent reconstituer du système fluvial Moyenne Durance depuis fin Moyen Age. Des phases « crise » morphodynamique (fin XIVe siècle, XVP-XIXe siècles) d'accalmie s'individualisent, commandées avant tout par variable climatique, paramètre anthropique ne jouant semble-t-il qu'un rôle subsidiaire.