Sökning: "Oceans"
Visar resultat 11 - 15 av 144 avhandlingar innehållade ordet Oceans.
11. Phosphate and Arsenic Cycling under Experimental Early Proterozoic Marine Conditions
Sammanfattning : Nutrient dynamics in the Archean-Paleoproterozoic oceans strongly influenced primary productivity and the rise of atmospheric O2. Reconstructing the cycling of key nutrients such as dissolved inorganic phosphate (DIP) at this time is important for our understanding of the timing, rate and extent of atmospheric oxygenation at this time. LÄS MER
12. A contribution to modelling the global carbon dioxide cycle with emphasis on fluxes to and within the ocean
Sammanfattning : This thesis deals with the biogeochemical cycle of carbon. The focus is on the global aspects of the cycle, especially on processes that operate with characteristic times between one and one thousand years. LÄS MER
13. Seabirds as food for thought : An integrative study on seabird ecology and ecosystem services in changing marine systems
Sammanfattning : The importance of the benefits that humans obtain from the oceans is increasingly recognized, along with the rapid decline in marine resources that threatens these benefits. Studying seabirds – top predators in marine ecosystems, can provide insights about multiple pressures and the state of the oceans. LÄS MER
14. On mechanisms controlling air-sea gas exchange
Sammanfattning : Carbon is essential to the Earth’s system functioning, playing a major role in physical and biogeochemical processes in the atmosphere, the terrestrial biosphere, and the oceans. The concentration of carbon-based greenhouse gases in the atmosphere, such as carbon dioxide (CO2) and methane (CH4), has been increasing since the industrial era. LÄS MER
15. Towards the compilation of a new Digital Bathymetric Model of the North Atlantic Ocean
Sammanfattning : Topography on land and bathymetry, its underwater depth equivalent, belong to the most fundamental attributes of the solid earth's surface. Over two thirds of the earth is covered by water, with about 90% of this area lying more than 1000m below the sea surface. LÄS MER