Sökning: "Marine boundary layer"

Visar resultat 11 - 15 av 32 avhandlingar innehållade orden Marine boundary layer.

  1. 11. Changes in ocean geochemistry across the K-Pg boundary interval

    Författare :Tjördis Störling; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; K-Pg boundary; Paleocene; stable silicon isotopes; sponge spicules; radiolaria; Cerithium Limestone;

    Sammanfattning : The Cretaceous - Paleogene boundary (K-Pg, 66 Ma) was a time interval with dramatic changes in the Earth’s climate and the ocean environment. It was characterized by severe disruptions of marine biogeochemical cycles due to a meteorite impact during a time of active volcanism. LÄS MER

  3. 12. Modeling of new particle formation and growth in the atmospheric boundary layer

    Författare :Emilie Öström; Centrum för miljö- och klimatvetenskap (CEC); []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; New particle formation; Secondary organic aerosols; Process-based modeling; Climate;

    Sammanfattning : Atmospheric aerosols affect climate, but to what degree still remains one of the largest uncertainties in global climate models. To improve the representation of aerosols in future climate models we need a greater understanding of aerosol processes. LÄS MER

  4. 13. Influence of External Factors on the Turbulence Structure in the Atmospheric Boundary Layer

    Författare :Cecilia Johansson; Søren Larsen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Meteorology; Meteorologi; Meteorology; Meteorologi; Meteorology; meteorologi;

    Sammanfattning : The theory used in today’s weather- and climate models to describe processes near the earth’s surface, i.e. transport of heat, moisture and momentum between the ground and the atmosphere, is based on the idea that only local factors are important, such as temperature and wind speed near the ground. LÄS MER

  5. 14. Wind and atmospheric stability characteristics over the Baltic Sea

    Författare :Nina Svensson; Erik Sahlée; Hans Bergström; Anna Rutgersson; Xiaoli Guo Larsén; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; coastal transition; stable conditions; boundary layer rolls; low level jet; WRF; Baltic Sea; Meteorology; Meteorologi;

    Sammanfattning : In recent years there has been an increase in offshore wind energy, which poses the need for accurate wind speed estimates in the marine environment, especially in coastal areas where most wind turbines will be placed. This thesis is focused on the Baltic Sea, which is a small, semi-enclosed sea where land-sea interaction play an important role in explaining the wind patterns. LÄS MER

  7. 15. The Enemy Below - Adhesion and Friction of Ship Hull Fouling

    Författare :Dinis Oliveira; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ship resistance; in-water hull cleaning; roughness; biofouling; hull grooming; frictional resistance; adhesion strength; turbulent boundary layer; hull form factor;

    Sammanfattning : Below the waterline, commercial ships are good targets for marine organisms to attach and proliferate, a problem commonly known as biofouling. A fouled hull means higher hydrodynamic resistance, which can result in significant fuel penalties. LÄS MER