Search for dissertations about: "low-level jets"

Showing result 1 - 5 of 12 swedish dissertations containing the words low-level jets.

2. 1. Global Climatology and Regional Modeling of Coastal Low-Level Jets

   Author : Muhammad Raza Ranjha; Michael Tjernström; Gunilla Svensson; Branko Grisogono; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; coastal low-level jets; climatology; regional modeling; boundary layer; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

   Abstract : Localized coast-parallel wind-speed maxima at low altitude, known as coastal low-level jets (CLLJs) have important ramifications to the coastal climate and a number of human activities. This thesis documents the existence of the CLLJs around the globe including their mesoscale structure, dynamics and spatio-temporal variability. READ MORE

4. 2. Mesoscale dynamics and boundary-layer structure in topographically forced low-level jets

   Author : Stefan Söderberg; Michael Tjernström; Branko Grisogono; Douw G. Steyn; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; low-level jets; boundary layer; turbulence structure; Meteorology; Meteorologi;

   Abstract : Two types of mesoscale wind-speed jet and their effects on boundary-layer structure were studied. The first is a coastal jet off the northern California coast, and the second is a katabatic jet over Vatnajökull, Iceland. READ MORE

5. 3. Near surface atmospheric flow over high latitude glaciers

   Author : Oskar Parmhed; Erland Källén; Branko Grisogono; Haraldur Ólafsson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Stable boundary layer; Ekman layer; Katabatic flow; gravity wave; low-level jets; Meteorology; Meteorologi;

   Abstract : In this thesis various descriptions of the near surface atmospheric flow over a high latitude glacier is used in an effort to increase our understanding of the basic flow dynamics there. Through their contribution to sea-level change, mountain glaciers play a significant role in Earth’s climate system. READ MORE

6. 4. Mesoscale Processes over the Baltic Sea

   Author : Nina Svensson; Erik Sahlée; Hans Bergström; Anna Rutgersson; Søren Larsen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Boundary layer; Baltic Sea; stable conditions; low-level jet; sea breeze; boundary layer rolls; mesoscale effects; WRF; LIDAR;

   Abstract : The objective of this thesis is to study mesoscale processes above the Baltic Sea, which is a small, semi-enclosed sea where land-sea interaction may have a large impact on the offshore conditions. It is only the last tens of years that offshore research has become more popular, and one reason for this is the increasing offshore wind energy, which poses the need for accurate estimates of wind speed and turbulence conditions in the marine environment. READ MORE

7. 5. Thermally driven wind modification in coastal areas and its influence on sound propagation with application to wind power

   Author : Karin Törnblom; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Wind power; sound propagation; thermally driven; coastal areas; temperature gradient; low level jet; Earth sciences; Geovetenskap;

   Abstract : The objective of the current study is to investigate the wind modifications in coastal areas and also to see the impact of atmospheric conditions on long-range sound propagation over sea. This is important when planning where to place wind turbines. READ MORE