title: [Research on the NO2 mean concentration measurement with target differential optical absorption spectroscopy technology].
abstract: A new monitoring method of NO2 concentration near ground with the target difference absorption spectrum technology (Target DOAS) is introduced in the present paper. This method is based on the passive difference absorption spectrum technology. The instrument collects solar reflection spectrum of remote objectives, such as wall of building and mountain, and a specific reference spectrum is chosen to subtract the influence of trace gases from the target to atmospheric top, then integrated concentration of NO2 along the path between the target and instrument can be calculated through the differential absorption spectra inversion algorithm. Since the distance between the instrument and target is given, the mean concentration of NO2 can be derived. With developed Target DOAS instrument, NO2 concentration measurement was carried out in Hefei. And comparison was made between the target DOAS and long path difference absorption spectrometer. Good consistency was presented, proving the feasibility of this method.
authors.affiliation: Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. jinliu@aiofm.ac.cn
authors.forename: Jin
authors.initials: J
authors.lastname: Liu
authors.forename: Fu-Qi
authors.initials: FQ
authors.lastname: Si
authors.forename: Hai-Jin
authors.initials: HJ
authors.lastname: Zhou
authors.forename: Min-Jie
authors.initials: MJ
authors.lastname: Zhao
authors.forename: Ke
authors.initials: K
authors.lastname: Dou
authors.forename: Wen-Qing
authors.initials: WQ
authors.lastname: Liu