Mobile MAX-DOAS observation of NO2 and comparison with OMI satellite data in 
the western coastal areas of the Korean peninsula

Chong, Jihyo; Kim, Young J.; Gu, Myojeong; Wagner, T.; Song, Chul H.

doi:10.1016/j.chemosphere.2015.06.071

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Mobile MAX-DOAS observation of NO₂ and comparison with OMI satellite data in the western coastal areas of the Korean peninsula

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Gu, Myojeong
Satellite Remote Sensing, Max Planck Institute for Chemistry, Max Planck Society;

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Wagner, T.
Satellite Remote Sensing, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Chong, J., Kim, Y. J., Gu, M., Wagner, T., & Song, C. H. (2016). Mobile MAX-DOAS observation of NO₂ and comparison with OMI satellite data in the western coastal areas of the Korean peninsula. Chemosphere, 143, 10-16. doi:10.1016/j.chemosphere.2015.06.071.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-2297-C

Abstract

Ground-based MAX-DOAS measurements have been used to retrieve column densities of atmospheric absorbers such as NO₂, SO₂, HCHO, and O-3. In this study, mobile MAX-DOAS measurements were conducted to map the 2-D distributions of atmospheric NO₂ in the western coastal areas of the Korean peninsula. A Mini-MAX-DOAS instrument was mounted on the rooftop of a mobile lab vehicle with a telescope mounted parallel to the driving direction, pointing forward. The measurements were conducted from 21 to 24 December 2010 along the western coastal areas from Gomso harbor (35.59N, 126.61E) to Gunsan harbor (35.98N, 126.67E). During mobile MAX-DOAS observations, high elevation angles were used to avoid shades from nearby obstacles. For the determination of the tropospheric vertical column density (VCD), the air mass factor (AMF) was retrieved by the so-called geometric approximation. The NO₂ VCDs from 20 and 45 degree elevation angles were retrieved from mobile MAX-DOAS measurements. The tropospheric NO₂ VCDs derived from mobile MAX-DOAS measurements were compared directly to those retrieved by the OMI satellite observations. Mobile MAX-DOAS VCD was in good agreement with OMI tropospheric VCD on most days. However, OMI tropospheric VCD was much higher than that of mobile MAX-DOAS on 23 December 2010. One probable reason for this difference is that OMI retrieval might overestimate NO₂ VCD under haze conditions, when a pollution plume was transported over the measurement site. The mobile MAX-DOAS observations reveal much finer spatial patterns of NO₂ distributions, which can provide useful information for the validation of satellite observation of atmospheric trace gases. (C) 2015 Elsevier Ltd. All rights reserved.