Open AccessMeasurements of NO and CO in Shanghai urban atmosphere by using quantum cascade lasers
Author(s) -
YuanYuan Tang,
Wenqing Liu,
Ruifeng Kan,
Jianguo Liu,
Yabai He,
Yujun Zhang,
Zhenyu Xu,
Jun Ruan,
Hong Geng
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.020224
Subject(s) - environmental science , atmosphere (unit) , carbon monoxide , diurnal temperature variation , quantum cascade laser , cascade , trace gas , atmospheric sciences , laser , optics , materials science , remote sensing , meteorology , physics , chemistry , geology , biochemistry , chromatography , catalysis
Nitric oxide (NO) and carbon monoxide (CO) in Shanghai urban atmosphere have been measured during the EXPO 2010 by an optical trace gas monitoring system based on room-temperature pulsed quantum cascade lasers (QCL). The results showed obvious diurnal variation in their concentrations. A great correlation was found by analyzing the diurnal variation, indicating common emission sources for both NO and CO. However analysis of the data from street canyon measurements showed that on a vehicle-by-vehicle basis NO emissions correlated only weakly with CO emissions. A possible explanation to this issue has been given.