DYNAMIC OF THE LOWER TROPOSPHERE FROM MULTIWAVELENGTH LIDAR MEASUREMENTS

dhe dynamical behavior of the PBL (planetary Boundary Layer) has a direct effect on the air quality and on the boundary layer parameterization schemes used in local, regional and global models. Active remote sensing systems such as LIDARs (Light Detection and Ranging) use aerosols of the atmosphere as tracers for identification of atmospheric state determined by convective activity, turbulence or dust intrusions. In this paper we have used multiwavelength lidar measurements from a scientific research center in Magurele, Bucharest area (44.35 N latitude, 26.03 E longitude) to provide information about the PBL height evolution, correlated to Saharan dust intrusions over Romania and to meteorological conditions. The Richardson number method is used to estimate the boundary layer height from the radio-soundings. We have used pressure, temperature and dew point profiles as well as the wind direction profiles from NOAA (National Oceanic and Atmospheric Administration) data base. The height of layers in the lower troposphere from lidar signal was calculated using the gradient method- minima of the first derivative. The results were consistent with the ones obtained from radio soundings.