Atmospheric measurements of HONO by tunable diode laser absorption spectroscopy

被引：58
作者：
Schiller, CL
Locquiao, S
Johnson, TJ
Harris, GW
机构：
[1] York Univ, Dept Chem, N York, ON M3J 1P3, Canada
[2] York Univ, Ctr Atmospher Chem, N York, ON M3J 1P3, Canada
[3] Pacific NW Natl Lab, Richland, WA 99352 USA
来源：
JOURNAL OF ATMOSPHERIC CHEMISTRY | 2001年 / 40卷 / 03期
基金：
加拿大自然科学与工程研究理事会;
关键词：
atmospheric measurements; HONO; line strength; nitrous acid; tunable diode laser spectroscopy;
D O I：
10.1023/A:1012264601306
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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) nu (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. 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.
引用
收藏
页码：275 / 293
页数：19
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