A5013690079- Silicon Effects in Agriculture
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Marine Biology and Ecology Research
- Geomagnetism and Paleomagnetism Studies
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Aluminum toxicity and tolerance in plants and animals
- Microbial Community Ecology and Physiology
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Geological Studies and Exploration
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Diatoms and Algae Research
- Hydrocarbon exploration and reservoir analysis
- Arsenic contamination and mitigation
- Astro and Planetary Science
- Arctic and Russian Policy Studies
- Geological and Geophysical Studies
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2015-2025
Centre National de la Recherche Scientifique
2015-2025
Sorbonne Université
2015-2025
Institut de Recherche pour le Développement
2015-2025
Laboratoire de Biologie Intégrative des Modèles Marins
2018-2024
Institut Pierre-Simon Laplace
2021
Sorbonne University Abu Dhabi
2020-2021
Délégation Ile-de-France Villejuif
2016
Royal Museum for Central Africa
2006-2015
Université Paris Cité
2015
The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of international programme, and contains measured quality controlled before end 2016. IDP2017 includes from Atlantic, Pacific, Arctic, Southern Indian oceans, with about twice volume previous IDP2014. For first time, for a large suite biogeochemical parameters as well aerosol rain characterising atmospheric trace element isotope (TEI) sources. TEI in are by careful assessment intercalibration...
Three Si isotope materials have been used for an inter-laboratory comparison exercise to ensure reproducibility between international laboratories investigating natural variations using a variety of chemical preparation methods and mass spectrometric techniques. These proposed standard reference are (i) IRMM-018 (a SiO2 standard), (ii) Big-Batch fractionated material prepared at the University California Santa Barbara), (iii) Diatomite diatomite sample originally deposited as marine biogenic...
Precise Si isotopic fractionation in silica (quartz), opal (diatomite, sponges) and standards have been determined employing a Nu Instruments Plasma multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS) dry mode, using Cetac Aridus desolvating nebulization system. Variations sample 28Si/29Si ratios are expressed as δ29Si units, which represent deviations ‰ from the same ratio of NBS28 standard measured standard-sample bracketing technique. We Mg isotopes dynamic mode for...
The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of international programme, and contains measured quality controlled before end 2013. It consists two parts: (1) a compilation digital for more than 200 trace elements isotopes (TEIs) as well classical hydrographic parameters, (2) eGEOTRACES Electronic Atlas providing strongly inter-linked on-line atlas including 300 section plots 90 animated 3D scenes. IDP2014 covers Atlantic, Arctic, Indian...
We analyzed δ 29 Si of dissolved silicate for eight water column profiles across the Southern Ocean (south Australia in spring 2001) from Seasonal Ice Zone (SIZ) north to Subantarctic (SAZ), including first isotopic compositions measured Si‐depleted seawaters. All display mixed layer enrichments heavy isotopes relative deep accordance with preferential uptake light isotope by diatoms. As levels decrease SIZ northward Polar Front (PFZ) SAZ, surface and mesopelagic signatures generally become...
We report silicon isotopic determinations for USGS rock reference materials BHVO‐1 and BHVO‐2 using a Nu Plasma multi‐collector (MC)‐ICP‐MS, upgraded with new adjustable entrance slit, to obtain medium resolution, as well stronger primary pump newly designed sampler skimmer cones (“B” cones). These settings, combined the use of collector slits, allowed resolution be reached that was sufficient overcome 14 N 16 O 2 interferences overlying 30 Si 28 peaks, respectively, in an earlier set‐up....
We investigate the dissolved δ 30 Si of Congo River, world's second largest riverine source to ocean. Small tributaries rich in organic carbon running through wetlands (“Black Rivers”) exhibit lowest ever measured surface waters (+0.02 ± 0.15‰), whilst main branch and have higher values (+0.98 0.13‰), well within average what has been so far. Our data suggest that contribution Black Rivers total discharge basin is 22 10% mostly controlled by weathering intensity rather than fluxes. propose...
One of the most widely used sample preparation methods for Si isotopic analyses (δ30Si and δ29Si) is based on cationic chromatography, which does not remove anions from samples. Although it was first thought that presence in natural concentrations distort analyses, has recently been shown sulfate can induce a significant shift ratio measurements above SO42−/Si ratios (wt) 0.02. Here, we show dissolved organic matter also major bias when analysing river waters. To overcome these non-spectral...
Abstract. Silicon isotopic signatures (δ30Si) of water column silicic acid (Si(OH)4) were measured in the Southern Ocean, along a meridional transect from South Africa (Subtropical Zone) down to 57° S (northern Weddell Gyre). This provides first reported data summer across whole Antarctic Circumpolar Current (ACC). δ30Si variations are large upper 1000 m, reflecting effect silica pump superimposed upon transfer ACC: transport surface waters northward by net Ekman drift and their convergence...