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Modelling the impact of Baltic Sea upwelling on the atmospheric boundary layer
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2014 (English)In: Tellus. Series A, Dynamic meteorology and oceanography, ISSN 0280-6495, E-ISSN 1600-0870, Vol. 66, 24041- p.Article in journal (Refereed) Published
Abstract [en]

Coastal upwelling, with a strong sea-surface temperature (SST) signal, is extremely common in the Baltic Sea during the summer months. Although the spatial scale of upwelling is small, its high frequency of occurrence in the semi-enclosed basin may allow the SST signature to have significant feedback onto the lower atmosphere. In this paper, we develop a method to remove the signature of upwelling from SST fields, and use these modified SST fields as the lower boundary condition of an atmospheric model, allowing us to evaluate the importance of coastal upwelling to the mean summer conditions over the Baltic. The contribution of upwelling is found to be small generally, although significant locally over areas where upwelling is most common. This includes 2 m air temperature reductions of up to 2°C, wind speed reductions of up to 0.25 m s−1, and reductions in the mean boundary-layer height of up to 100 m. High-resolution simulations with artificially enhanced upwelling suggest that upwelling may become increasingly important as winds slacken at the end of an upwelling period.

Place, publisher, year, edition, pages
2014. Vol. 66, 24041- p.
Keyword [en]
Upwelling, Air-sea interaction, Boundary-Layer Meteorology, Physical Oceanography
National Category
Meteorology and Atmospheric Sciences Oceanography, Hydrology, Water Resources
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:uu:diva-234646DOI: 10.3402/tellusa.v66.24041ISI: 000343127200001OAI: oai:DiVA.org:uu-234646DiVA: diva2:757373
Available from: 2014-10-22 Created: 2014-10-22 Last updated: 2017-12-05Bibliographically approved

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Sproson, DavidSahlée, Erik

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