Search for dissertations about: "ocean interaction"

Showing result 11 - 15 of 52 swedish dissertations containing the words ocean interaction.

2. 11. Significance of N2 fixing planktonic symbioses for open ocean ecosystems

   Author : Marcus Stenegren; Rachel A. Foster; Agneta Andersson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nitrogen fixation; diazotrophs; symbiosis; DDA; cyanobacteria; qPCR; piecewise SEM; microarray; tropics; subtropics; marine; open ocean; Richelia; Calothrix; Marine Ecology; marin ekologi;

   Abstract : Di-nitrogen (N2) fixers, also called diazotrophs, are able to reduce atmospheric N2 into bioavailable nitrogen, giving them an advantage in open ocean regions with low dissolved inorganic nitrogen concentrations. The focus of this thesis are three lineages of symbiotic heterocystous filamentous types (het-1, het-2 and het-3), that associate with several genera of microalgae called diatoms (collectively referred to as Diatom Diazotroph Associations, DDAs). READ MORE

4. 12. Atmosphere-ocean Interactions in Swell Dominated Wave Fields

   Author : Alvaro Semedo; Anna Rutgersson; Oyvind Saetra; Piero Lionello; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Waves; Wind sea; Swell; Swell propagation; MABL; Air-sea interaction; Momentum flux; Wave climate; Coupling; Wave age; Empirical Orthogonal functions; Wave model; Climate model; WAM; RCA; wave heights; Meteorology; Meteorologi; Meteorologi; Meteorology;

   Abstract : Ocean wind waves represent the atmosphere-ocean boundary, playing a central role in the air-sea exchanging processes. Heat, mass and momentum are transferred across this boundary, with waves mediating the exchange of principally the momentum between the winds and the ocean surface. During the generation process waves are called wind sea. READ MORE

5. 13. Primary Marine Aerosol Production : An experimental study based on Arctic Ocean water and a sea water proxy

   Author : Julia Zábori; Margareta Hansson; Gordon McFiggans; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; primary marine aerosol; climate change; sea water physical properties; Applied Environmental Science; tillämpad miljövetenskap;

   Abstract : This thesis focuses on the interplay between the physical properties of ocean water and primary marine aerosol (PMA) emissions in the context of a rapidly changing Arctic climate. PMAs are an important part of the climate system due to their ability to interact with incoming solar radiation and to influence cloud properties. READ MORE

6. 14. Spiritum sidus : The star of our life – On internal tides in the ocean

   Author : Gaspard Geoffroy; Jonas Nycander; Christian Stranne; Aurélien Ponte; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Internal waves; Tides; Argo floats; Time series analysis; Flow-topography interaction; Atmospheric Sciences and Oceanography; atmosfärvetenskap och oceanografi;

   Abstract : Tidal currents flowing over rough bathymetry generate internal tides. These internal waves with tidal frequency can be decomposed into vertical modes. Low modes generally travel thousands of kilometers, until they break due to shear flow instabilities, while high modes are believed to break close to the generation site. READ MORE

7. 15. Introducing Surface Gravity Waves into Earth System Models

   Author : Lichuan Wu; Anna Rutgersson; Erik Sahlée; Peter Janssen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Surface gravity waves; Air-sea interaction; Earth-System Model; Atmospheric mixing; Upper-ocean turbulence; Meteorologi; Meteorology;

   Abstract : Surface gravity waves alter the turbulence of the bottom atmosphere and the upper ocean. Accordingly, they can affect momentum flux, heat fluxes, gas exchange and atmospheric mixing. However, in most state-of-the-art Earth System Models (ESMs), surface wave influences are not fully considered or even included. READ MORE