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Preprints
https://doi.org/10.5194/acp-2020-348
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-348
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 Jul 2020

15 Jul 2020

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This preprint is currently under review for the journal ACP.

Assessment of meteorology vs control measures in China fine particular matter trend from 2013–2019 by an environmental meteorology index

Sunling Gong1, Hongli Liu1, Bihui Zhang2, Jianjun He1, Hengde Zhang2, Yaqiang Wang1, Shuxiao Wang3, Lei Zhang1, and Jie Wang4 Sunling Gong et al.
  • 1State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 2National Meteorological Center, Beijing 100081, China
  • 3School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
  • 4Zhenqi Environmental Protection Co., Lt., Hangzhou, China

Abstract. A framework was developed to quantitatively assess the contribution of meteorology variations in the trend of particular matter (PM) concentrations and to separate the impacts of meteorology from the control measures in the trend, based upon an Environmental Meteorology Index (EMI). The model-based index EMI realistically reflects the role of meteorology in the trend of PM and can also be attributed into three major factors: deposition, vertical accumulation and horizontal transports. Based on the 2013–2019 PM2.5 observation data and re-analysis meteorological data in China, the contributions of meteorology and control measures in nine regions of China were assessed separately by the EMI-based framework. Monitoring network observations show that the PM2.5 concentrations have been declined about 50 % on national average and about 35 % to 53 % for various regions. It is found that the nation-wide emission control measures were the dominant factor in the declining trend of China PM2.5 concentrations, contributing to about 47 % of the PM2.5 decrease from 2013 to 2019 on the national average and 32 % to the 52 % for various regions. The meteorology has a variable and sometimes critical contribution to the year by year variations of PM2.5 concentrations, 5 % on annual average and 10–20 % for the fall-winter heavy pollution seasons.

Sunling Gong et al.

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Sunling Gong et al.

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Short summary
Surface concentrations of PM2.5 in China has been on a declining trend since 2013 across the country. This research found that the control measures of emission reduction are the dominant factors in the PM2.5 declining trends in various regions. The contribution by the meteorology to the surface PM2.5 concentrations from 2013 to 2019 was not found to show a consistent trend, fluctuating positively or negatively about 5 % on annual average and 10–20 % for the fall-winter heavy pollution seasons.
Surface concentrations of PM2.5 in China has been on a declining trend since 2013 across the...
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