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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2019-500
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-500
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 09 Jan 2020

Submitted as: research article | 09 Jan 2020

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A revised version of this preprint is currently under review for the journal AMT.

A new TROPOMI product for tropospheric NO2 columns over East Asia with explicit aerosol corrections

Mengyao Liu1, Jintai Lin1, Hao Kong1, K. Folkert Boersma2,3, Henk Eskes2, Yugo Kanaya4, Qin He5, Xin Tian6,7, Kai Qin5, Pinhua Xie6,8,7, Robert Spurr9, Ruijing Ni1, Yingying Yan10, Hongjian Weng1, and Jingxu Wang1 Mengyao Liu et al.
  • 1Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
  • 2Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
  • 3Meteorology and Air Quality department, Wageningen University, Wageningen, the Netherlands
  • 4Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan
  • 5School of Environment and Geoinformatics, China University of Mining and Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China
  • 6Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, China
  • 7Key laboratory of Environmental Optical and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei, 230031, China
  • 8CAS Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 9RT Solutions Inc., Cambridge, Massachusetts 02138, USA
  • 10Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, China

Abstract. We present a new product with explicit aerosol corrections, POMINO-TROPOMI, for tropospheric nitrogen dioxide (NO2) vertical column densities (VCDs) over East Asia, based on the newly launched TROPOspheric Monitoring Instrument with an unprecedented high horizontal resolution. Compared to the official TM5-MP-DOMINO (OFFLINE) product, POMINO-TROPOMI shows stronger concentration gradients near emission source locations and better agrees with MAX-DOAS measurements (R2 = 0.75, NMB = 0.8 % versus R2 = 0.68, NMB = 41.9 %). Sensitivity tests suggest that implicit aerosol corrections, as in TM5-MP-DOMINO, lead to underestimations of NO2 columns by about 25 % over the polluted Northern East China region. Reducing the horizontal resolution of a priori NO2 profiles would underestimate the retrieved NO2 columns over isolated city clusters in western China by 35 % but with overestimates by more than 50 % over many offshore coastal areas. The effect of a priori NO2 profiles is more important under calm conditions.

Mengyao Liu et al.

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Mengyao Liu et al.

Mengyao Liu et al.

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Latest update: 04 Jun 2020
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Short summary
Nitrogen oxides (NOx = NO + NO2) are important air pollutants in the troposphere and play crucial roles in the formation of ozone and particulate matters. The recently launched TROPOspheric Monitoring Instrument (TROPOMI) provides an opportunity to retrieve tropospheric concentrations of nitrogen dioxide (NO2) at an unprecedented high horizontal resolution. This work presents a new NO2 retrieval product over East Asia and further quantifies key factors affecting the retrieval, including aerosol.
Nitrogen oxides (NOx = NO + NO2) are important air pollutants in the troposphere and play...
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