Search for dissertations about: "open ocean"

Showing result 1 - 5 of 30 swedish dissertations containing the words open ocean.

  1. 1. Significance of N2 fixing planktonic symbioses for open ocean ecosystems

    University dissertation from Stockholm : Department of ecology, environment and plant sciences, Stockholm University

    Author : Marcus Stenegren; Stockholms universitet.; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nitrogen fixation; diazotrophs; symbiosis; DDA; cyanobacteria; qPCR; piecewise SEM; microarray; tropics; subtropics; marine; open ocean; Richelia; Calothrix; marin ekologi; Marine Ecology;

    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

  2. 2. Digital technologies as support for learning about the marine environment: Steps toward ocean literacy Digital technologies and ocean literacy

    University dissertation from Göteborgs universitet

    Author : Geraldine Fauville; Göteborgs universitet.; Gothenburg University.; [2017]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; digital technologies; social media; ocean literacy; communication; science education; environmental education; sociocultural theory;

    Abstract : Over the last century the ocean has been negatively impacted by human activities. In order to continue benefitting from marine services and goods, and the qualities afforded to human life through the ocean, citizens need to be informed about their relationship to the ocean and their own impact on it, that is they need to be ocean literate. READ MORE

  3. 3. Anthropogenic Radionuclides in the Arctic Ocean: Distribution and Pathways

    University dissertation from The Jubileum Institute, Department of Radiation Physics, Lund University Hospital, S-221 85 Lund, Sweden

    Author : Dan Josefsson; Lund University.; Lunds universitet.; [1998]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; americium; plutonium; iodine; strontium; cesium; Sellafield; Chernobyl; global fallout; currents; shelf; ocean; radioactivity; Arctic; Ecology; Ekologi;

    Abstract : Anthropogenic radionuclide concentrations have been determined in seawater and sediment samples collected in 1991, 1994 and 1996 in the Eurasian Arctic shelf and interior. Global fallout, releases from European reprocessing plants and the Chernobyl accident are identified as the three main sources. READ MORE

  4. 4. Applications of ocean transport modelling

    University dissertation from Stockholm : Department of Meteorology, Stockholm University

    Author : Hanna Corell; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ocean transport modelling; connectivity; particle-tracking; sediment transport; Forsmark; marine protected areas; MPA; stream functions; heat flux; wind forcing; Carcinus maenas; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Abstract : The advective motion of seawater governs the transport of almost everything, animate or inanimate, present in the ocean and those lacking the ability to outswim the currents have to follow the flow. This makes modelling of advective ocean transports a powerful tool in various fields of science where a displacement of something over time is studied. READ MORE

  5. 5. Formation and Distribution of Marine Biogenic Halocarbons with Emphasis on Polar Regions

    University dissertation from Stockholm : Department of Meteorology, Stockholm University

    Author : Anders Karlsson; Göteborgs universitet.; Gothenburg University.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; volatile biogenic halocarbons; Arctic Ocean; Southern Ocean; sea ice; snow; air-sea exchange; cyanobacteria;

    Abstract : It is well-established that marine micro- and macroalgae form volatile halogenated compounds (halocarbons). Production occurs throughout the world ocean with strong regional sources in coastal areas. In the atmosphere, these compounds are converted to reactive inorganic halogen compounds, which degrade ozone. READ MORE