Profiling of SO2, NO2, and O3in the lower troposphere by multiwavelength differential absorption lidar

Takashi Fujii*, Tetsuo Fukuchi, Takuya Nayuki, Hiroshi Hayami, Koshichi Nemoto, Nobuo Takeuchi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We performed SO2, NO2, and O3 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 of NO2 and O3 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 O3 concentration by the reaction with NOX. 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 O3 in the lower troposphere using a stable, high power transmitter for NO2 measurement. Concentration variations of NO2 and O3 for 900-1350 m altitude were measured for a continuous time interval of 24 hours without maintenance.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
Externally publishedYes
EventLidar Remote Sensing for Industry and Environment Monitoring III - Hangzhou, China
Duration: 2002 Oct 242002 Oct 25


  • Concentration profile
  • Differential absorption lidar
  • Dye laser
  • Inversion layer
  • Mixing layer
  • Nitrogen dioxide
  • Ozone
  • Sulfur dioxide
  • Sum frequency generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Profiling of SO2, NO2, and O3in the lower troposphere by multiwavelength differential absorption lidar'. Together they form a unique fingerprint.

Cite this