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Thermally driven mesoscale flows - simulations and measurements
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science. (Vindenergi)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science. (Vindenergi)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science. (Vindenergi)
2007 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 12, no 6, 623-641 p.Article in journal (Refereed) Published
Abstract [en]

The wind climate shows often large local variations in coastal areas. The present study was based on measurements at several sites on the island of Gotland in the Baltic Sea and on simulations with a numerical meso-gamma-scale atmosphere model (the MIUU model). It is common for thermally driven flows, e.g. sea breezes and low level jets, to evolve resulting in supergeostrophic winds. The most important parameters affecting these flows were found to be temperature and roughness differences between the land and sea. Although the wind speed increases climatologically over a see, a case where the wind speed decreased when advected out over a cold sea was investigated. This happens if the stable boundary layer (SBL) over the sea is deep enough. A deep SBL is favoured by strong thermal winds in combination with large temperature differences between the land and sea. With a shallow SBL the wind speed increases over the sea.

Place, publisher, year, edition, pages
2007. Vol. 12, no 6, 623-641 p.
Keyword [en]
Atlantic Ocean, North Atlantic, Northeast Atlantic, Baltic Sea, depth, boundary layer, Cold, roughness, temperature, models, atmosphere, islands, climate, winds, simulation, flow
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-12247ISI: 000252175500001OAI: oai:DiVA.org:uu-12247DiVA: diva2:40016
Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2017-12-11Bibliographically approved

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Bergström, HansJohansson, Cecilia

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