SPIE Proceedings [SPIE 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications - Cartagena de Indias, Colombia (Monday 28 September 1998)] 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications - Lidar studies of atmospheric boundary layer dynamics, aerosols, and cirrus cloud properties at Buenos Aires (34.6 S/58.5 W)