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Occurrence of Kelvin-Helmholtz Billows in Sea-breeze Circulations

Plant, R. S. and Keith, G.J. (2007) Occurrence of Kelvin-Helmholtz Billows in Sea-breeze Circulations. Boundary-Layer Meteorology, 122 (1). pp. 1-15. ISSN 0006-8314

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To link to this item DOI: 10.1007/s10546-006-9089-x

Abstract/Summary

Centred at the interface between the sea-breeze and the return flow aloft, Kelvin-Helmholtz billows (KHB) are an important feature of the turbulent structure of some sea-breeze circulations (SBCs). In other SBCs, there are no prominent KHBs observed. Factors governing the appearance of billows are determined from a database of 139 sea breezes, constructed from two years of summertime surface observations at a site on the south coast of England. Post-frontal oscillations occur in the surface data for some SBCs and are interpreted as indicating possible KHBs aloft. The SBCs are formed under a wide range of synoptic conditions, enabling various measures of possible billow occurrence to be related to properties of the large-scale, ambient flow. Consistent with laboratory experiments of density currents, KHBs are suppressed for propagation into a head wind and enhanced with a tail wind. They are also found to be enhanced for stronger ambient wind speeds, while large-scale coast-parallel flow is effective in suppressing the billows.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:787
Uncontrolled Keywords:Kelvin-Helmholtz billows - Post-frontal oscillations - Sea breeze - Surface observations
Publisher:Springer
Publisher Statement:The original publication is also available at springerlink.com

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