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Proceedings Paper

Tropospheric profiling of SO2 and O3 by multiwavelength DIAL
Author(s): Tetsuo Fukuchi; Takashi Fujii; Naohiko Goto; Koshichi Nemoto; Nianwen Cao; Nobuo Takeuchi
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Paper Abstract

A multiwavelength differential absorption lidar (DIAL) system for measurement of trace atmospheric substances was developed. Vertical concentration profiles of SO2 in the lower troposphere were measured by three wavelength dual-DIAL (on wavelength=300.05 nm, off wavelengths=299.35 nm, 300.90 nm, with null profiles obtained at 300.05 nm) . The measurement wavelengths were chosen to minimize the effect of O3 . Measurement results showed an average SO2 concentration of 0.6 ppb for height 2000-4000 m, and the SO2 measurement error was estimated to be about 1 ppb for 150 m range resolution. Although the measured SO2 concentration was below the resolution of our system, the results show that the system is capable of measuring trace SO2 with approximately 0.15 ppm-m resolution. In addition, vertical O3 concentration profiles in the lower troposphere were measured using two identical DIAL pairs (on wavelength=285.0 nm, off wavelength=290.1 nm), from which two null profiles and two DIAL profiles were obtained simultaneously. The DIAL profiles, which showed an average O3 concentration of 42 ppb for height 1000-4000 m, agree with simultaneous O3 sonde measurements. The effect of backscatter gradients was shown to be small. The O3 measurement error was estimated to be 3.4 ppb for 150 m range resolution, or about 0.5 ppm-m.

Paper Details

Date Published: 13 February 2001
PDF: 9 pages
Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417059
Show Author Affiliations
Tetsuo Fukuchi, Central Research Institute of Electric Power Industry (Japan)
Takashi Fujii, Central Research Institute of Electric Power Industry (Japan)
Naohiko Goto, Central Research Institute of Electric Power Industry (Japan)
Koshichi Nemoto, Central Research Institute of Electric Power Industry (Japan)
Nianwen Cao, Central Research Institute of Electric Power Industry (Japan)
Nobuo Takeuchi, Chiba Univ. (Japan)


Published in SPIE Proceedings Vol. 4153:
Lidar Remote Sensing for Industry and Environment Monitoring
Upendra N. Singh; Upendra N. Singh; Kazuhiro Asai; Toshikasu Itabe; Toshihiro Ogawa; Nobuo Sugimoto, Editor(s)

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