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1 August 1992 Lidar wind shear measurements in the planetary boundary layer
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During the last years various remote and conventional techniques are widely used for th investigation of the processes in the planetary boundary layer (PBL) . The knowledge about regional meteorology at a corn— plex terrain is a significant problem which is currently justifying thus motivates a number of studies. The lidars allow profiles of the meteorological parameters to be remotely obtained with high time and spatial resolutions. The absence of contact sensors makes them convenient instruments particularly in two cases: 1. When investigating transient processes such as formation and destruction of a given atmospheric stratification; 2. For the observation of interaction areas at the boundary of different layers where significant changes in the meteorological parameters behaviour occur, e.g. in case of front invasion, etc. The investigation of fronts advections is an interesting problem for the mesoscale meteorology since their occurrence modify the evolution of the planetary boinIary layer parameters. Various techniques (radars, sodars and lidars) ' are used to monitor these modifications in order to reveal the characteristics of frontal dynamics. The obtained results are generally compared with data from traditional means. Lidar measurements of wind velocity profiles by slant sounding in the PBL accompanied by ground based measurements and a comparison with radio and kytoon data have been carried out in the country during 32 hours . We also carried out similar investigations studying the influence of various miro- and mesoscale phenomena on the wind velocity stratification ' In the present work parts of the preliminary results from two lidar campaigns (1988, 1990) in the region of Sofia city are described: A). Some results of lidar measurements of wind velocity profiles in case of a stable PBL formation after the sunset are presented. The results are obtained during the BLEX'90 (Boundary Layer EXperiment). This campaign aimed to perform an investigation of various phenomena and processes in the PBL over an urban area. B). Some observations of a wind shear appearance during a cold front invasion over the region of Sofia are also presented. These results are derived in the course of the international boundary layer experiment ZOND '88 (teams from Institute of Atmospheric Optics of Siberian Branch of USSR Academy of Sciences and from Institute of Electronics of Bulgarian Academy of Sciences).
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ivan N. Kolev, Orlin Parvanov, and Boiko K. Kaprielov "Lidar wind shear measurements in the planetary boundary layer", Proc. SPIE 1688, Atmospheric Propagation and Remote Sensing, (1 August 1992);

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