Abstract
Abstract The purpose of this study is to improve understanding of shallow cumuli in the planetary boundary layer (PBL) by quantitatively analysing subcloud turbulence variables. Aircraft turbulence data for three flights from the 1986 Hydrologic–Atmospheric Pilot Experiment project over southwest France is extensively analyzed in terms of both cumulus regime and eddy dimensions. The turbulent part of any variable has been divided into three spatial frequency bands to estimate the scale-dependent effects of cumuli on the total turbulent fluxes and energy at several levels within the subcloud layer. Case 1 (21 May) had strong active (positively buoyant) cumuli that were deep and large in diameter; additionally, there were weak active cumuli that were shallow and small in diameter. Case 2 (9 May) had weak active cumuli with a smaller vertical depth, and case 3 (13 June) had only forced (negatively buoyant) cumuli. The National Center of Atmospheric Research King Air aircraft made gust probe measurements alon...
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