title: [MAX-DOAS measurements of NO2 column densities and vertical distribution at Ny-Alesund, Arctic during summer].
abstract: The multi-axis differential optical absorption spectroscopy (MAX-DOAS), one of the remote sensing techniques for trace gases measurements, is sensitive to the lower atmosphere by eliminating the influence of stratosphere retrieved from zenith-sky spectroscopy. Ground-based MAX-DOAS measurements were carried out to observe NO2 at Ny-Alesund, Arctic from 5th Jul to 1st Aug 2011. The differential slant column densities (DSCDs) of NO2 at four off-axis angles showed typical pattern of tropospheric absorbers. Based on the assumption that NO2 was well mixed in 0-1 km of the troposphere, the mean mixing ratio of NO2 during the measurement period was 1.023E11 molec x cm(-3). The fluctuation of NO2 might be related to the fossil fuel combustions and the photochemical reactions. The vertical distribution of NO2 at 0-3 km showed that NO2 was mainly originated from boundary layer of sea surface.
authors.affiliation: Institute of Polar Environment, School of Earth & Space Sciences, University of Science & Technology of China, Hefei 230026, China. yuhanluo@mail.ustc.edu.cn
authors.forename: Yu-Han
authors.initials: YH
authors.lastname: Luo
authors.forename: Li-Guang
authors.initials: LG
authors.lastname: Sun
authors.forename: Wen-Qing
authors.initials: WQ
authors.lastname: Liu
authors.forename: Pin-Hua
authors.initials: PH
authors.lastname: Xie
authors.forename: Fu-Qi
authors.initials: FQ
authors.lastname: Si
authors.forename: Hai-Jin
authors.initials: HJ
authors.lastname: Zhou