采用MAX-DOAS观测北极新奥尔松地区夏季NO<sub>2</sub>的柱浓度与垂直分布

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。

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-lesund, 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·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.

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罗宇涵, 孙立广, 刘文清, 谢品华, 司福祺, 周海金. 采用MAX-DOAS观测北极新奥尔松地区夏季NO₂的柱浓度与垂直分布[J]. 光谱学与光谱分析, 2012, 32(9): 2336. LUO Yu-han, SUN Li-guang, LIU Wen-qing, XIE Pin-hua, SI Fu-qi, ZHOU Hai-jin. MAX-DOAS Measurements of NO2 Column Densities and Vertical Distribution at Ny-Alesund, Arctic During Summer[J]. Spectroscopy and Spectral Analysis, 2012, 32(9): 2336.

采用MAX-DOAS观测北极新奥尔松地区夏季NO₂的柱浓度与垂直分布

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