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- W268570327 abstract "The development and maintenance of a well–mixed atmospheric boundary layer have a direct influence on many atmospheric phenomena, such as cloud formation or pollutant distribution. The growth of the convective boundary layer (CBL) is driven by both surface fluxes of heat and moisture and by the entrainment of warm and dry air from the free atmosphere into the boundary layer. Wind shear at the surface and at the inversion layer enhances these processes. Buoyancy and shear can substantially affect the depth of the mixed layer, the CBL’s main characteristics and the turbulence statistics. The structure of the CBL has been theoretically found to differ in purely neutral and convective cases (Sykes and Henn 1989; Moeng and Sullivan 1994; Khanna and Brasseur 1998). Moreover, observations and numerical simulations have shown that in a CBL where both forces are present, the convection pattern is in the form of horizontal rolls (LeMone 1973; Christian and Wakimoto 1989, Pino et al. 2003). From 1970 onwards many researchers (Tennekes 1973; Stull 1976a; Zeman and Tennekes 1977; Tennekes and Driedonks 1981; Driedonks and Tennekes 1984; Fedorovich 1995; Sorbjan 1996; Pino et al. 2003, 2006; Sorbjan 2004; Kim et al. 2006; Conzemius and Fedorovich 2006b) have concentrated on studying the value and possible evolution of the ratio of virtual potential temperature fluxes at the inversion level and at the surface, β = −wθv|i/wθv |s. The main goal of these studies was to understand the driving processes of the entrainment heat flux and subsequently to develop a suitable parameterization for the entrainment flux. By analyzing the turbulence kinetic energy (TKE) budget, it is possible to obtain a parametric expression which depends only on scaling parameters. These expressions have been evaluated with observations (Artaz and Andre 1980; Dubosclard 1980; Driedonks 1982; Culf 1992; Betts and Ball 1994; Angevine et al. 1998; Hageli et al. 2000). By comparing the parameterized boundary layer depth or entrainment flux ratio against observations, the authors of some of these studies pointed to the importance of taking shear and dissipation contributions into account in the parameterizations." @default.
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- W268570327 date "2008-06-09" @default.
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- W268570327 title "Scaling analysis of the turbulent kinetic energy at the entrainment zone in sheared convective boundary layers" @default.
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