Measurement of atmospheric nitrogen dioxide column density by solar spectroscopic method

Mau Hing CHAN, A. Y.S. Cheng*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


Nitrogen Dioxide (NO2) column density was studied by solar spectroscopic method. In the retrieval of NO2 column density, the Kitt Peak Solar Flux Atlas provides a standard reference of the extraterrestrial solar spectrum. However, in order to eliminate the Fraunhofer features from the solar spectrum, the ground-level solar spectrum needs to be re-scaled for wavelength correction and resolution matching to the reference Kitt Peak Solar spectrum. The analysis procedure becomes much simplified if both the reference and the ground-level solar spectra are captured by the same instrument. A portable miniature charge-coupled device (CCD) spectrometer was employed to acquire both the reference and ground-level solar spectra. The reference spectrum was captured in Xinjiang (42.107°N, 83.750°E), the People's Republic of China, during a flight in a plane. The altitude of the reference solar spectrum is 11,230 meters above the sea level. The ground-level solar spectrum was acquired in the campus of City University of Hong Kong (22.336°N, 114.173°E) using a computer-controlled solar tracker. By analyzing the solar spectra obtained at two different locations and altitudes, NO2 total column density can be deduced.

Original languageEnglish
Article number34
Pages (from-to)283-291
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number1
Publication statusPublished - 2005
EventOptical Technologies for Atmospheric, Ocean and Environmental Studies - Beijing, China
Duration: 18 Oct 200422 Oct 2004

Scopus Subject Areas

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

User-Defined Keywords

  • Atmospheric pollutant monitoring
  • Differential absorption spectroscopy
  • Solar spectrum


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