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Coherent structures in the very stable atmospheric boundary layer

✍ Scribed by Paul Ruscher; L. Mahrt

Publisher
Springer
Year
1989
Tongue
English
Weight
781 KB
Volume
47
Category
Article
ISSN
0006-8314

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✦ Synopsis

This study examines the structure of horizontal modes (meandering, vertical modes or fossil turbulence) in a layer of intermittent turbulence occurring at the top of a strongly stratified nocturnal inversion layer as observed by fast response aircraft data. The spatial variation of the coefficients of the principal components identify regular coherent structures with mainly horizontal motions. Conditional sampling is formulated in terms of this spatial variation. The quasi-horizontal motions are characterized by relatively sharp edges (transition zones) where horizontal convergence or divergence, small-scale turbulence and vertical fluxes seem to be concentrated. Zones of horizontal divergence appear to be associated with ejection of cold air from the underlying surface inversion while the convergent zones might be due to random "collisions" between horizontal modes.

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