Lidar wind shear measurements in the planetary boundary layer

Computer Science – Sound

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Scientific paper

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 a period of 32 hours. We also carried out similar investigations studying the influence of various micro- 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 are described. 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. 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 the Institute of Atmospheric Optics/Siberian Branch of the USSR Academy of Sciences and from the Institute of Electronics of the Bulgarian Academy of Sciences).

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