Journal of Atmospheric Chemistry

, Volume 40, Issue 3, pp 275–293

Atmospheric Measurements of HONO by Tunable Diode Laser Absorption Spectroscopy

Authors

  • C. L. Schiller
    • Department of Chemistry and The Centre for Atmospheric ChemistryYork University
  • S. Locquiao
    • Department of Chemistry and The Centre for Atmospheric ChemistryYork University
  • Timothy J. Johnson
    • Battelle Pacific Northwest National Laboratory
  • G.W. Harris
    • Department of Chemistry and The Centre for Atmospheric ChemistryYork University
Article

DOI: 10.1023/A:1012264601306

Cite this article as:
Schiller, C.L., Locquiao, S., Johnson, T.J. et al. Journal of Atmospheric Chemistry (2001) 40: 275. doi:10.1023/A:1012264601306

Abstract

Ambient gas phase nitrous acid (HONO) has been measured by Tunable Diode Laser Absorption Spectroscopy with sub-ppbv detection limits. An R-branch line in the 1263.4 cm−1 ν3 band was found tobe free of interference and suitable for ambient HONO measurements. Nitrous acid was measured during the night and early morning at an urban site in Toronto, Canada, during the summer of 1998. Average mixing ratios, integrated over 30 minutes, ranged from below the minimum detection limit of 300 pptv to 1.9 ppbv, with the highest concentrations observed during the early morning hours. During the night of 19 June 1998, the concentration of HONO increased by as much as 0.5 ppbv/hr. The usual decrease in HONO after sunrise was delayed by a few hours, possibly due to a combination of an increase in the production rate of HONO with rush hour, and attenuation of the early morning light by high NO2 within the aerosol fog/haze.

atmospheric measurementsHONOline strengthnitrous acidtunable diode laser spectroscopy

Copyright information

© Kluwer Academic Publishers 2001