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Proceedings Paper

Profiling of SO2, NO2, and O3 in the lower troposphere by multiwavelength differential absorption lidar
Author(s): Takashi Fujii; Tetsuo Fukuchi; Takuya Nayuki; Hiroshi Hayami; Koshichi Nemoto; Nobuo Takeuchi
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Paper Abstract

We performed SO2, NO2, and 03 measurements in the lower troposphere using a multiwavelength differential absorption lidar (MDIAL) system. Measurement results are compared with results of airborne and ground-based in-situ measurements performed simultaneously with lidar measurement. Vertical concentration variation of SO2 with 0-7 ppb for 1000-1700 m altitude was measured by dual-DIAL, and those ofNO2 and 03 with 0-50 ppb for 700-2000 m altitude were measured by 2-wavelength DIAL quasi-simultaneously. Measurement results suggest that NO2 was trapped below the inversion layer, which induced the reduction of 03 concentration by the reaction with NOR. Comparison of results obtained by DIAL and by in-situ methods showed that the MDIAL system had sufficient accuracy for verification of long-range transport models of sulfur compounds and for observation of chemical reactions of oxidants and nitrogen oxides. We also performed simultaneous profiling of NO2 and 03 in the lower troposphere using a stable, high power transmitter for NO2 measurement. Concentration variations ofNO2 and 03 for 900-1350 m altitude were measured for a continuous time interval of 24 hours without maintenance.

Paper Details

Date Published: 21 March 2003
PDF: 9 pages
Proc. SPIE 4893, Lidar Remote Sensing for Industry and Environment Monitoring III, (21 March 2003); doi: 10.1117/12.466157
Show Author Affiliations
Takashi Fujii, Central Research Institute of Electric Power Industry (Japan)
Tetsuo Fukuchi, Central Research Institute of Electric Power Industry (Japan)
Takuya Nayuki, Central Research Institute of Electric Power Industry (Japan)
Hiroshi Hayami, Central Research Institute of Electric Power Industry (Japan)
Koshichi Nemoto, Central Research Institute of Electric Power Industry (Japan)
Nobuo Takeuchi, Chiba Univ. (Japan)


Published in SPIE Proceedings Vol. 4893:
Lidar Remote Sensing for Industry and Environment Monitoring III
Upendra N. Singh; Toshikasu Itabe; Zhishen Liu, Editor(s)

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