Abstract

Vertical concentration profiles of atmospheric SO₂ of the order of parts in 10⁹ (ppb) were measured by a multiwavelength differential absorption lidar system. The error that was due to O₃ and aerosols was successfully reduced by a three-wavelength dual differential absorption lidar (DIAL), and a SO₂ concentration of 1.2 ppb for 2400–3000-m altitude was obtained with 300-m range resolution. The measurement error in dual DIAL was estimated to be <1.1 ppb when several factors were considered. The influence of O₃ on SO₂ measurement error was experimentally evaluated from simultaneous measurements of atmospheric SO₂ and O₃ by two conventional DIAL pairs, each using two wavelengths.

© 2001 Optical Society of America

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