Search Results
information about the meteorological conditions are important for weather forecasters, climate studies, and aviation control. One of the high priority duties of observers is the description of the evolution of clouds, especially within the planetary boundary layer. However, automatic weather reports are becoming important because human observations are becoming more difficult to organize, especially during nighttime ( Aviolat et al. 1998 ). The cloud amount (sky coverage in octas) can be automatically
information about the meteorological conditions are important for weather forecasters, climate studies, and aviation control. One of the high priority duties of observers is the description of the evolution of clouds, especially within the planetary boundary layer. However, automatic weather reports are becoming important because human observations are becoming more difficult to organize, especially during nighttime ( Aviolat et al. 1998 ). The cloud amount (sky coverage in octas) can be automatically
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
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
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
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
