Observation of tropospheric NO2 by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region, south China

doi:10.1088/1674-1056/23/9/094210

Abstract An airborne multi-axis differential optical absorption spectroscopic (AMAX-DOAS) instrument was developed and applied to measure tropospheric NO₂ in the Pearl River Delta region in the south of China. By combining the measurements in nadir and zenith directions and analyzing the UV and visible spectral region using the DOAS method, information about tropospheric NO₂ vertical columns was obtained. Strong tropospheric NO₂ signals were detected when flying over heavilly polluted regions and point sources like plants. The AMAX-DOAS results were compared with ground-based MAX-DOAS observations in the southwest of Zhuhai city using the same parameters for radiative transport calculations. The difference in vertical column data between the two instruments is about 8%. Our data were also compared with those from OMI and fair agreement was obtained with a correlation coefficient R of 0.61. The difference between the two instruments can be attributed to the different spatial resolution and the temporal mismatch during the measurements.

Keywords: air pollution tropospheric NO₂ airborne multi-axis differential optical absorption spectroscopy vertical column

Received: 20 December 2013
Revised: 25 March 2014
Accepted manuscript online:

PACS:

42.68.Ca

(Spectral absorption by atmospheric gases)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 41275037, 41275038, and 41275027).

Corresponding Authors: Xie Pin-Hua
E-mail: phxie@aiofm.ac.cn

Cite this article:

Xu Jin (徐晋), Xie Pin-Hua (谢品华), Si Fu-Qi (司福祺), Li Ang (李昂), Wu Feng-Cheng (吴丰成), Wang Yang (王杨), Liu Jian-Guo (刘建国), Liu Wen-Qing (刘文清), Andreas Hartl, Chan Ka Lok Observation of tropospheric NO₂ by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region, south China 2014 Chin. Phys. B 23 094210

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Observation of tropospheric NO2 by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region, south China

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Observation of tropospheric NO₂ by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region, south China