Sökning: "Si isotopes"
Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Si isotopes.
1. Isotope-based reconstruction of the biogeochemical Si cycle : Implications for climate change and human perturbation
Sammanfattning : The global silicon (Si) cycle is of fundamental importance for the global carbon cycle. Diatom growth in the oceans is a major sequestration pathway for carbon on a global scale (often referred to as the biological pump). LÄS MER
2. Diatom-rich sediment formation in lakes
Sammanfattning : Unicellular photosynthetic golden algae called diatoms are one of the most abundant silicifying organisms. Diatoms take up silicon and build their frustules, in the form of biogenic silica (BSi), which have high preservation potential, and thus are found in sediments. LÄS MER
3. Marine silicon cycle through the Cenozoic
Sammanfattning : Silicon (Si) cycle is one of Earth's major biogeochemical cycles. Furthermore, the dissolved form of Si (DSi) is an essential nutrient for both terrestrial and marine ecosystems. LÄS MER
4. Fractionation of the stable silicon isotopes : analytical method developments and selected applications in geochemistry
Sammanfattning : During the last few decades, variations in the 'natural' isotopic abundances of stable elements (termed 'fractionation') have received considerable interest from the scientific community. Though analytical methods and techniques for the measurement of isotopic abundances with adequate figures of merit have been available for light elements (e.g. LÄS MER
5. Integrating fluvial processes into the global Si cycle
Sammanfattning : Silicon (Si) is ubiqutious in natural waters as dissolved silica (DSi) and is used as a nutrient by many plant and animal species. DSi ultimately derives from the weathering of silicate minerals, a process which also consumes atmospheric CO2 and couples the silicon and carbon cycles. LÄS MER
