A Combined Lidar, Long-path Extinction and In-situ Aerosol Experiment in Southern Ontario

During August, 1992, a number of colocated optical and chemical experiments were performed at the Center for Atmospheric Research Experiments at Egbert (north of Toronto), Ontario, Canada. These experiments were symbiotic in that they were designed to address a number of atmospheric research problems of interest to Canada, including the need to determine: (1) the deposition velocity of polynuclear aromatic hydrocarbons and trace metals, (2) the size distribution and hygroscopic behaviour of particles affecting eastern Canadian visibility, (3)the evolution of nitrogen chemistry at nighttime, (4) the formation of particulate nitrate from gaseous precursors, and (5) the need to understand the photochemical particle production processes in early morning sunrise events. This work involved AES scientists as well as scientists from Germany visiting Canada under a bilateral exchange program. This paper will present the initial results from these experiments.