A5009381986- Geology and Paleoclimatology Research
- Coral and Marine Ecosystems Studies
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies
- Pacific and Southeast Asian Studies
- Oceanographic and Atmospheric Processes
- Ocean Acidification Effects and Responses
- Marine animal studies overview
- Marine Bivalve and Aquaculture Studies
- Marine and coastal plant biology
- Isotope Analysis in Ecology
- Climate variability and models
- Marine and fisheries research
- Pleistocene-Era Hominins and Archaeology
- Geological Formations and Processes Exploration
- Hydrocarbon exploration and reservoir analysis
- earthquake and tectonic studies
- Heavy metals in environment
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Water Quality and Pollution Assessment
- Therapeutic Uses of Natural Elements
- Calcium Carbonate Crystallization and Inhibition
- Paleontology and Evolutionary Biology
- Archaeological and Geological Studies
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2010-2024
Institut de Recherche pour le Développement
2001-2024
Centre National de la Recherche Scientifique
2012-2024
CEA Valduc
2021-2022
Sorbonne Université
2015-2018
Institute of Paleoprimatology Human Paleontology Evolution and Paleoenvironments
2012-2015
Université Paris Cité
2015
Universidade Federal Fluminense
2007
Institut de Recherche pour le Développement
2004-2006
Institut de Recherche pour le Développement
2001
The Sr/Ca ratio of coral aragonite is used to reconstruct past sea surface temperature (SST). Twenty‐one laboratories took part in an interlaboratory study measurements. Results show bias can be significant, and the extreme case could result a range SST estimates 7°C. However, most data fall within narrower Porites reference material JCp‐1 now characterized well enough have certified value 8.838 mmol/mol with expanded uncertainty 0.089 following International Association Geoanalysts (IAG)...
We present a 47‐year‐long record of sea surface temperature (SST) derived from Sr/Ca and U/Ca analysis massive Porites coral which grew at ∼ 4150 calendar years before (B.P.) in Vanuatu (southwest tropical Pacific Ocean). Mean SST is similar both the modern instrumental paleorecord, exhibit El Niño‐Southern Oscillation (ENSO) frequency oscillations. However, several strong decadal‐frequency cooling events marked modulation seasonal cycle, with power ENSO decadal frequencies, are observed...
The natural river water certified reference material SLRS‐4 (NRC‐CNRC, National Research Council‐Conseil de Recherches Canada) has been routinely analysed for major and trace elements by six French laboratories. Most measurements were made using inductively coupled plasma‐mass spectrometry. For silicon thirty one (rare earth elements, Ag, B, Br, Cs, Ga, Ge, Li, P, Pd, Rb, Se, Th, Ti, Tl, W, Y Zr), no values are assigned NRC‐CNRC. We propose some compilation related uncertainties according to...
Abstract Increasing atmospheric CO 2 from man-made climate change is reducing surface ocean pH. Due to limited instrumental measurements and historical pH records in the world’s oceans, seawater variability at decadal centennial scale remains largely unknown requires documentation. Here we present evidence of striking secular trends decreasing since late nineteenth century with pronounced interannual decadal–interdecadal South Pacific Ocean 1689 2011 CE. High-amplitude oceanic changes,...
We present a high‐resolution study of five geochemical components New Caledonia coral core. Minor and trace elements (Sr/Ca, U/Ca, Mg/Ca, Ba/Ca), together with oxygen isotopes (δ 18 O), were investigated at near‐fortnightly resolution. Geochemical measurements compared to sea surface temperature (SST TSG ) salinity (SSS recorded by thermosalinograph (TSG) located less than 10 m from the coral. Results show that Sr/Ca, δ O are temperature‐dependent (correlation coefficient local SST between...
We present early mid‐Holocene records of Sr/Ca, δ 18 O and sw from marine archives collected in Vanuatu: two Porites sp. corals (6.7–6.5 ka BP) a Tridacna maxima giant clam (6.2–6.0 BP). O, were used as proxies for sea surface temperature (SST) salinity (SSS). The fossil geochemical compared to modern T. records. Reconstructed mean SSTs the coral are similar, implying that Western Pacific Warm Pool (WPWP)' southern edge had reached its location by 6.7–6.5 BP. post‐glacial SST rise Southwest...
We present a 60‐year near‐monthly record of tropical sea surface temperature (SST) during the Little Ice Age derived from coupled Sr/Ca and U/Ca analysis massive coral New Caledonia (southwest Pacific). The indicates that, 1701 to 1761, temperatures were on average 1.4°C cooler than past 30 years. This cooling was accompanied by strong interannual interdecadal oscillations that changed background state. Correlations between SST changes Southern Oscillation Pacific Decadal are evolutive appear depend
Physicochemical simulation (pH, electrolytes and temperature) of three physiological media was carried out in order to follow the release trace elements contained seven edible clays (mainly kaolinite, illite, muscovite quartz) collected from West African countries Côte d'Ivoire, Guinée Sénégal. These are ingested by pregnant women for diverse reasons that related their condition. Simulated oral (6.5<pH<7), stomach (pH approximately 1.8) intestinal 8.3) were prepared separately compare...
Abstract Although relatively rare compared to similar latitudes in the Pacific or Indian Oceans, massive coral colonies are present Tropical/Equatorial Southwestern Atlantic Ocean. However, detailed geochemical compositions of these corals still largely unknown. In this work, we growth rates, Sr/Ca, and U/Ca ratios colony ( Siderastrea stellata ) sampled at Rocas Atoll, off Brazilian coast. These variables primarily affected by sea surface temperature (SST) seasonal scale, wind stress...
Plusieurs études paléoclimatiques et paléoenvironnementales (analyses de séries coralliennes sédimentaires) ont été menées à terre en mer au cours des deux dernières décennies, Nouvelle-Calédonie dans l'archipel du Vanuatu. Bien qu'encore inachevées, elles apportent informations majeures sur la variabilité environnements cette région sud-ouest Pacifique depuis le dernier maximum glaciaire : les importantes fluctuations niveau marin températures surface l'eau contribué mise place paysages...
Early-life stages of reef-building corals are vital to coral existence and reef maintenance. It is therefore crucial study juvenile response future climate change pressures. Moreover, known be reliable recorders environmental conditions in their skeletal materials. Aposymbiotic Acropora millepora larvae were cultured different seawater temperature (27 29ºC) pCO2 (390 750 µatm) understand the impacts 'end century' ocean acidification (OA) warming (OW) on morphology geochemistry. The...
Abstract. Porites coral-based sea surface temperature (SST) reconstructions are obtained from the measurement of skeleton Sr/Ca ratio. However, influence salinity in incorporation these trace elements aragonitic is still poorly documented. Laboratory experiments indicate that three different coral species (not including widely used genus), does not thermometer. In this study, we test effect on Sr/Ca-based SST at monthly and interannual timescales open-ocean environmental conditions. We use a...
Coral reefs are increasingly in jeopardy due to global changes affecting both reef accretion and bioerosion processes. Bioerosion processes dynamics dead carbonates under various environmental conditions relatively well understood but only over a short-term limiting projections of coral evolution by 2100. It is thus essential monitor understand the long term. Here we studied assemblage traces microborers core massive Diploastrea sp. from Mayotte, allowing us explore variability its specific...
Abstract. Recent Southern Hemisphere (SH) atmospheric circulation, predominantly driven by stratospheric ozone depletion over Antarctica, has caused changes in climate across the extratropics. Here, we present evidence that Brazilian coast (southwestern Atlantic) may have been impacted from both wind and sea-surface temperature derived this process. Skeleton analysis of massive coral species living shallow waters off Brazil are very sensitive to air–sea interactions, seem record impact....
Abstract. The south west Pacific is affected by climatic phenomena such as ENSO (El Niño Southern Oscillation) or the PDO (Pacific Decadal Oscillation). Near-monthly resolution calibrations of Sr/Ca, U/Ca and δ18Oc were made on corals taken from New Caledonia Wallis Island. These geochemical variations could be linked to SST (sea surface temperature) SSS salinity) over last two decades, itselves dependent occurrences. On other hand, near-half-yearly century smoothes seasonal interannual...