Fine-scale structure and mixing within an inversion |
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Authors: | C J Readings E Golton K A Browning |
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Institution: | (1) Meteorological Research Unit, RAF Cardington, Beds., England;(2) Radio and Space Research Station, Slough, England;(3) Meteorological Research Unit, Royal Radar Establishment, Malvern, England |
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Abstract: | This paper describes some of the results that were obtained in an experimental study of an inversion capping a convective boundary layer, during which a balloon-borne probe was flown through the actual interface at the same time as it was scanned by a high power 10-cm Doppler radar. The initial analysis has revealed several interesting features including the possible presence of small-scale Kelvin-Helmholtz billows at the crest of the hummocks of the inversion and the absence of an inertial subrange. A model is proposed for the transfer of sensible heatdownwards across the inversion. This is hypothesised as a two-stage process — sporadic thickening by the entrainment of air from above and below due to the action of the breaking billows, and a continual erosion of the lower surface by convective activity. |
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