A5004791923- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Silicon Effects in Agriculture
- Diatoms and Algae Research
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Marine Biology and Environmental Chemistry
- Marine Sponges and Natural Products
- Protist diversity and phylogeny
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Planetary Science and Exploration
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Botany, Ecology, and Taxonomy Studies
- Ionosphere and magnetosphere dynamics
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Ocean Acidification Effects and Responses
- Coral and Marine Ecosystems Studies
- Aluminum toxicity and tolerance in plants and animals
- Coal and Its By-products
- Modular Robots and Swarm Intelligence
- Oceanographic and Atmospheric Processes
Université de Bretagne Occidentale
2024
Laboratoire des Sciences de l'Environnement Marin
2016-2024
Lund University
2024
GEOMAR Helmholtz Centre for Ocean Research Kiel
2024
Carl von Ossietzky Universität Oldenburg
2024
Institut Universitaire Européen de la Mer
2014-2024
Finnish Meteorological Institute
2023
University of California, Santa Barbara
2023
University of Bristol
2016-2021
Abstract Many studies use sedimentary biogenic silica (bSiO 2 ) stable isotopes (e.g., δ 30 Si) as paleoproxies but neglect signals from other reactive SiO phases. We quantified Si for multiple pools in coastal river‐plume sediments, revealing up to −5‰ difference between acid‐leachable and alkaline‐digestible amorphous . Thus, previous have missed valuable information on early diagenetic products and, cases where sediments were not cleaned, potentially biased bSiO values. Acid‐leachable Si,...
Abstract. The silicon isotopic composition (δ30Si) of deep sea sponges' skeletal element – spicules reflects the silicic acid (DSi) concentration their surrounding water and can be used as natural archives bottom nutrients. In order to reconstruct past silica cycle robustly, it is essential better constrain mechanisms biosilicification, which are not yet well understood. Here, we show that apparent fractionation during spicule formation in sponges from equatorial Atlantic ranges −6.74 ‰...
In this study we evaluate the benthic fluxes of silicic acid along West Antarctic Peninsula (WAP). Silicic (DSi) is one macronutrients essential in fuelling biological hot spots diatom‐dominated primary production WAP. Here measure concentration and stable silicon isotopic composition DSi porewater profiles, biogenic silica content (BSi), diatom abundance from sediment cores collected We couple these measurements with reaction‐transport modeling, to assess flux processes that release key...
Abstract. The silicon isotope composition of deep-sea sponges skeletal element – spicules reflects the silicic acid (DSi) concentration their surrounding water, and can be used as natural archives bottom water nutrients. In order to reconstruct past silica cycle robustly, it is essential better constrain mechanisms biosilicification, which are not yet well understood. Here, we show that apparent isotopic fractionation (∆30Si) during spicule formation in deep–sea from equatorial Atlantic...
Abstract. The marine silicon cycle is intrinsically linked with carbon cycling in the oceans via biological production of silica by a wide range organisms. stable isotopic composition (denoted δ30Si) siliceous microfossils extracted from sediment cores can be used as an archive past oceanic cycling. However, biogenic has only been measured diatoms, sponges and radiolarians, fractionation relative to seawater entirely unknown for many other silicifiers. Furthermore, biochemical pathways...
The element silicon is everywhere! In fact, the second most abundant in Earth’s crust. Silicon rocks and minerals breaks down transported from rivers streams into world’s oceans. Many marine organisms need as it a crucial nutrient to build their skeletons. eventually reaches seafloor, but its journey abyss not straightforward due biological, physical, chemical processes. All these processes transport transform silicon, creating cycle that we call cycle. directly connected carbon cycle,...
Abstract. The three most abundant stable isotopes of Silicon (Si), 28Si, 29Si, and 30Si, all occur in plants. Isotope studies are a potential tool to explore uptake function plant Si, it is developing field. However, there lack from natural environments, species the African continent, parts including reproductive structures. In this study, naturally grown papyrus plants were sampled Okavango Delta divided into five organs, i.e. umbel, culm, scales, rhizome, roots. Samples analysed for TN,...
Abstract The stable isotopic composition of diatom silica is used as a proxy for nutrient utilisation in natural waters. This approach provides essential insight into the current and historic links between biological production, carbon cycling climate. However, estimates fractionation during production from both laboratory field studies are variable, biochemical pathways responsible remain unknown. Here, we investigate silicon through series chemical precipitation experiments that analogous...
The Southern Ocean, the ocean encircling Antarctica, has been described by explorers as cold, empty, and dangerous. Despite this, it is a paradise for tiny algae called diatoms that are crucial players in regulation of our climate. Why these organisms so happy this cold far away ocean? Diatoms have solid shell made glass-like material silica, they need to find silicon surface waters build it. Ocean perfect place because full compared other oceans. This due special phenomenon pump, which...
polymerisation."Has been added.