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Laura Bianco, James M. Wilczak, and Allen B. White

below this a turbulence-free zone expands downward with time, spanning the layer from 2.0 to 1.3 km at 1900 LST. In contrast, boundary layer depth detection methods that rely on profiles of mean temperature, winds, or aerosols, such as those obtained from balloon soundings or lidars, would continue to provide a depth corresponding to the temperature inversion at the earlier maximum depth of the PBL, and not to the present depth of the turbulence. Although the example shown in Fig. 1 is of a

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Danny E. Scipión, Phillip B. Chilson, Evgeni Fedorovich, and Robert D. Palmer

entrainment zone. Several multiple-radar-frequency techniques have been introduced in the past as a means of improving the range resolution ( Kudeki and Stitt 1987 ; Palmer et al. 1990 , 1999 ; Luce et al. 2001 ). Multiple-frequency techniques have been successfully used to study the ABL at UHF ( Chilson et al. 2003 ; Chilson 2004 ). Complementary to field observations of the CBL by in situ and remote sensing measurement methods, numerical simulation approaches—specifically, the large eddy simulation

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