Concurrent FM-CW Radar and Lidar Observations of the Boundary Layer

Determining Planetary Boundary Layer Height by Micro-pulse Lidar with Validation by UAV Measurements

“…Based on the meteorological conditions in the Taipei basin in summer, we assumed that aerosols are mostly distributed beneath the PBL top, thus MPL gradient observation data was used to calculate the PBLH. Considering that the maximum amplitude range of the PBLH should be less than 210 m when using the gradient method (Noonkester et al, 1974;Flamant et al, 1997), the data were averaged for 5 minutes before the gradient calculation. Also, because of near-field limitation (Campbell et al, 1982;Berkoff et al, 2003) we removed the data under 225 m agl (above ground level).…”

A review of radar observations of the troposphere in clear air conditions

“…In a FM-CW system this restfiction does not apply, and measurements may be made to ranges as short as a few tens of meters. However, the performance of FM-CW radars deteriorates at long ranges as a consequence of unavoidable departures from a perfectly linear sweep of transmitter frequency [Richter et al, 1973a].…”

“…Around 1970, two instrumental advances were made: highly sensitive pulsed Doppler radars [Dobson, 1970;Browning et al, 1972] and high-resolution (although non-Doppler) FM-CW radars [Richter, 1969] became available. Observations with FM,CW radars revealed in detail wave motions in the boundary layer with amplitudes as small as a few meters [Ottersten et al, 1973;Richter et al, 1973a]. Doppler processing has since been added to FM-CW radars, making them a potent tool for boundary layer investigations .…”

Applications des lasers à l'étude de l'atmosphère

“…Les sondages lidar ont également permis d'étudier la répartition spatiale en fonction du temps, des poussières libérées par les réacteurs des avions supersoniques au cours de leur vol stratosphérique [54]. En physique des nuages, l'utilisation du lidar couplée à celle d'autres moyens de sondage à distance comme le radar Doppler permet d'obtenir des informations sur la densité de particules ou de noyaux de condensation et de corréler ces mesures à celles, par exemple, du rapport de mélange de la vapeur d'eau ou de la température [14,15].…”