Articles | Volume 20, issue 3
https://doi.org/10.5194/acp-20-1483-2020
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, Daniel J. Jacob, Ke Li, Rachel F. Silvern, Shixian Zhai, Mengyao Liu, Jintai Lin, and Qiang Zhang

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ACM group: POMINO v2 NO2 Level-2 data, Peking University, available at: https://www.amazon.com/clouddrive/share/zyC4mNEyRfRk0IX114sR51lWTMpcP1d4SwLVrW55iFG/folder/S7IR7WSLSPikdLT_jsNX8g, last access: 23 January 2019. 
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Boersma, K. F., Eskes, H., Richter, A., De Smedt, I., Lorente, A., Beirle, S., Van Geffen, J., Peters, E., Van Roozendael, M., and Wagner, T.: QA4ECV NO2 tropospheric and stratospheric vertical column data from OMI (Version 1.1), Royal Netherlands Meteorological Institute (KNMI), https://doi.org/10.21944/qa4ecv-no2-omi-v1.1, 2019. 
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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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