A5053509796- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Amazonian Archaeology and Ethnohistory
- Marine Biology and Ecology Research
- Fish biology, ecology, and behavior
- Geography and Environmental Studies
- Geological and Geophysical Studies Worldwide
- Marine and coastal ecosystems
- Environmental and Cultural Studies in Latin America and Beyond
- Aeolian processes and effects
- Pleistocene-Era Hominins and Archaeology
- Oceanographic and Atmospheric Processes
- Geological and Tectonic Studies in Latin America
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Aquatic Ecosystems and Phytoplankton Dynamics
- Methane Hydrates and Related Phenomena
- Coastal and Marine Dynamics
- Heavy metals in environment
- Tree-ring climate responses
- Mercury impact and mitigation studies
- Ocean Acidification Effects and Responses
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2015-2024
Sorbonne Université
2015-2024
Institut de Recherche pour le Développement
2015-2024
Centre National de la Recherche Scientifique
2015-2024
CEA Valduc
2017-2024
Quisqueya University
2021-2023
University of Haiti
2023
Institut de Recherche pour le Développement
2006-2023
Universidade Federal Fluminense
2009-2020
University of Antofagasta
2010-2018
In semi-arid areas, many ecosystems and activities depend essentially on water availability. Morocco, the increase of demands combined to climate change induced decrease precipitation put a lot pressure groundwater. This paper reports results updating evaluation groundwater datasets with regards scenarios institutional choices. The continuous imbalance between extraction recharge caused dramatic decline in levels (20 65 m past 30 years). Additionally, Morocco suffers from degradation quality...
de niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.
Abstract Recent paleoclimatic studies suggest that changes in the tropical rainbelt across Atlantic Ocean during past two millennia are linked to a latitudinal shift of Intertropical Convergence Zone (ITCZ) driven by Northern Hemisphere (NH) climate. However, little is known regarding other potential drivers can affect rainfall, mainly due scarcity adequate and high-resolution records. In this study, we fill gap reconstructing precipitation Northeastern Brazil last 2,300 years from lake...
Abstract. In this paper we explore a speleothem δ18O record from Palestina cave, northwestern Peru, at site on the eastern side of Andes cordillera, in upper Amazon Basin. The is interpreted as proxy for South American Summer Monsoon (SASM) intensity and allows reconstruction its variability during last 1600 years. Two periods anomalous changes climate mean state corresponding to Medieval Climate Anomaly (MCA) Little Ice Age (LIA) identified Northern Hemisphere are recognized record, which...
Environmental conditions of the lowland tropical forests during last glacial maximum (LGM) between ca 20,000 and 18,000 14 C yr B.P., are reevaluated in terms dating control lithology analyzed seven pollen records from South America. The reevaluation shows that probably none published LGM sediments present or abundant. This conclusion is based on occurrence abrupt lithologic changes coupled with sedimentation rate interpolated radiocarbon dates. These findings suggest was represented by a...
Abstract Today, precipitation over tropical South America is largely controlled by the seasonal movements of Inter-Tropical Convergence Zone (ITCZ). During summer, ITCZ shifted southward due to warming continent. Paleoclimate data from southeastern Amazonia and central Andes indicate that these two areas evolved similarly during last 30,000 yr. However, between 12,400 8800 cal yr B.P., eastern received substantial moisture whereas Bolivian Altiplano was arid. This suggests summer then...
Abstract. Climate and ocean ecosystem variability has been well recognized during the twentieth century but it is unclear if modern biogeochemistry susceptible to large, abrupt shifts that characterized Late Quaternary. Time series from marine sediments off Peru show an centennial-scale biogeochemical regime shift in early nineteenth century, of much greater magnitude duration than present day multi-decadal variability. A rapid expansion subsurface nutrient-rich, oxygen-depleted waters...
Abstract In this study, we present a Holocene rainfall index based on three high‐resolution speleothem records from the Western Mediterranean, region under influence of westerly winds belt modulated by North Atlantic Oscillation (NAO). On centennial to millennial timescales, show that ice‐rafting events were likely associated with negative NAO‐like conditions during Early and Late Holocene. However, our data reveal is not clearly case for mid‐Holocene events, which also evidence positive...
Abstract In the Amazon basin, intense precipitation recycling across forest significantly modifies isotopic composition of rainfall (δ 18 O, δD). tropical hydrologic cycle, such an effect can be identified through deuterium excess (dxs), yet it remains unclear what environmental factors control dxs, increasing uncertainty dxs‐based paleoclimate reconstructions. Here we present a 4‐year record rainfall, monitored in northwestern basin. We analyze variations as function air mass history, based...
Abstract New pollen data from a core at Lagoa do Caçó, Maranhão state, Brazil (2°58′S 43°25′W; 120 m elevation), show higher frequencies of Podocarpus the end Pleistocene than today. The increase in , which follows successive various pioneer species such as Didymopanax Melastomataceae/Combretaceae, and Cecropia implies progressive late-glacial moist cool climatic conditions. A comparable is found other lowland records Amazonia. review published Amazonia suggests that moisture source was...
Abstract. The tropical Pacific ocean–atmosphere system influences global climate on interannual, decadal, as well longer timescales. Given the uncertainties in response of to increasing greenhouse gasses, it is important assess role variability past changes. Peruvian Upwelling Ecosystem (PUE) represents an ideal area reconstruct changes eastern region because productivity and subsurface oxygenation are strongly linked strength Walker circulation. Throughout last 2000 years, warmer (the Roman...
Abstract The Humboldt Current System ( HCS ) has the highest production of forage fish in world, although it is highly variable and future primary component, anchovy, uncertain context global warming. Paradigms based on late 20th century observations suggest that large‐scale forcing controls decadal‐scale fluctuations anchovy sardine across different boundary currents Pacific. We develop records since 1860 AD using scales from multiple sites containing laminated sediments compare them with...