Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 9261-9275, 2017
https://doi.org/10.5194/acp-17-9261-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Aug 2017
NOx emission trends over Chinese cities estimated from OMI observations during 2005 to 2015
Fei Liu1,2,3,a,b, Steffen Beirle3, Qiang Zhang1, Ronald J. van der A2,5, Bo Zheng4, Dan Tong1, and Kebin He1,4 1Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China
2Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, De Bilt, the Netherlands
3Max-Planck-Institut für Chemie, Mainz, Germany
4State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
5Nanjing University of Information Science & Technology (NUIST), Nanjing, China
anow at: Universities Space Research Association (USRA), GESTAR, Columbia, MD, USA
bnow at: NASA Goddard Space Flight Center, Greenbelt, MD, USA
Abstract. Satellite nitrogen dioxide (NO2) observations have been widely used to evaluate emission changes. To determine trends in nitrogen oxides (NOx) emission over China, we used a method independent of chemical transport models to quantify the NOx emissions from 48 cities and seven power plants over China, on the basis of Ozone Monitoring Instrument (OMI) NO2 observations from 2005 to 2015. We found that NOx emissions over 48 Chinese cities increased by 52 % from 2005 to 2011 and decreased by 21 % from 2011 to 2015. The decrease since 2011 could be mainly attributed to emission control measures in power sector; while cities with different dominant emission sources (i.e., power, industrial, and transportation sectors) showed variable emission decline timelines that corresponded to the schedules for emission control in different sectors. The time series of the derived NOx emissions was consistent with the bottom-up emission inventories for all power plants (r = 0. 8 on average), but not for some cities (r = 0. 4 on average). The lack of consistency observed for cities was most probably due to the high uncertainty of bottom-up urban emissions used in this study, which were derived from downscaling the regional-based emission data to city level by using spatial distribution proxies.

Citation: Liu, F., Beirle, S., Zhang, Q., van der A, R. J., Zheng, B., Tong, D., and He, K.: NOx emission trends over Chinese cities estimated from OMI observations during 2005 to 2015, Atmos. Chem. Phys., 17, 9261-9275, https://doi.org/10.5194/acp-17-9261-2017, 2017.
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Short summary
We assess NOx emission trends over Chinese cities based on satellite NO2 observations using a method independent of chemical transport models. NOx emissions over 48 Chinese cities have decreased significantly since 2011. Cities with different dominant emission sources (i.e. power, industrial, and transportation sectors) showed variable emission decline timelines that corresponded to the schedules for emission control in different sectors.
We assess NOx emission trends over Chinese cities based on satellite NO2 observations using a...
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