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 NOz at four off-axis angles showed typical pattern of tropospheric absorbers. Based on the assumption that NO2 was well mixed in 0~l km of the troposphere, the mean mixing ratio of NO2 during the measurement period was 1. 023E11 molec · cm‐3. The fluctuation of NO2 might be related to the fossil fuel combustions and the photochemical reactions. The vertical distribution of NOz at 0~3 km showed that NO2 was mainly originated from boundary layer of sea surface.%多轴差分吸收光谱技术(MAX-DOAS)作为一种观测痕量气体成分的地基遥感手段,在反演过程中利用天顶谱扣除了平流层的影响,因而对底层大气的测定较为敏锐.采用地基被动MAX-DOAS在2011年7月5日-8月1日对北极新奥尔松地区的NO2柱浓度进行观测.观测期间4个离轴观测角的NO2差分斜柱浓度(DSCDs)结果显示,NO2主要集中在对流层底部.观测期间新奥尔松地区NO2的平均混合比为1.023E11 molec·cm-3 (0～1 km),其含量的波动与轮船的化石燃料燃烧和大气光化学反应有关.3 km内NO2的垂直分布图显示,NO2主要来自海洋边界层的释放,且随时间呈现波动变化.
展开▼
