We present some results of lidar measurements of the altitude structure of aerosol fields based on the data array obtained during the shipborne mission on Lake Baikal in July-August 2002. Analysis of longitudinal and cross sections revealed a significant effect of local orography on the field structure. The correlation analysis of the altitude distribution of the optical depth along the ship route with the spatial profile of the Primorskii Ridge mountains was conducted. It was found that the highest correlation is observed in the lower atmospheric layer from 0.5 to 1.5-km height.