Articles | Volume 20, issue 3
Atmos. Chem. Phys., 20, 1483–1495, 2020
https://doi.org/10.5194/acp-20-1483-2020
Atmos. Chem. Phys., 20, 1483–1495, 2020
https://doi.org/10.5194/acp-20-1483-2020

Research article 07 Feb 2020

Research article | 07 Feb 2020

Effect of changing NOx lifetime on the seasonality and long-term trends of satellite-observed tropospheric NO2 columns over China

Viral Shah et al.

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Viral Shah on behalf of the Authors (06 Nov 2019)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (11 Nov 2019) by Chul Han Song
RR by Anonymous Referee #3 (11 Nov 2019)
RR by Anonymous Referee #4 (02 Dec 2019)
ED: Publish as is (03 Dec 2019) by Chul Han Song
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Short summary
We analyze 15 years of satellite observations of nitrogen dioxide (NO2) and use an atmospheric chemistry model to understand the seasonal changes and trends in nitrogen oxides (NOx) over China. We show that the seasonal changes in NO2 occur due to changes in the NOx oxidation lifetime. We find that Chinese NOx emissions peaked in 2011 and had decreased by about 25 % by 2018. But the decrease in NO2 in winter was larger, likely because of a simultaneous decrease in the NOx oxidation lifetime.
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