Ambient gas phase nitrous acid (HONO) has been measured by Tunable Diode Laser Spectroscopy with sub-ppbv detection limits. An R-branch line in the 1263.4 cm-1 v(sub 3) band was found to be 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. During the night of June 19, 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 hgh NO2 within the aerosol fog/haze.
Revised: January 12, 2012 |
Published: September 1, 2001
Citation
Schiller C.L., S. Locquiao, T.J. Johnson, and G.W. Harris. 2001.Atmospheric Measurements of HONO by Tunable Diode Laser Absorption Spectroscopy.Journal of Atmospheric Chemistry 40, no. 3:275-293. PNWD-SA-5243.