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Discussion papers
https://doi.org/10.5194/acp-2018-927
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-927
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Oct 2018

Research article | 15 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Characteristics of ozone and particles in the near-surface atmosphere in urban area of the Yangtze River Delta, China

Huimin Chen1, Bingliang Zhuang1, Jane Liu1,2, Tijian Wang1, Shu Li1, Min Xie1, Mengmeng Li1, Pulong Chen1, and Ming Zhao1 Huimin Chen et al.
  • 1School of Atmospheric Sciences, CMA-NJU Joint Laboratory for Climate Prediction Studies, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210023, China
  • 2Department of Geography and Planning, University of Toronto, Toronto, M5S 3G3, Canada

Abstract. To improve the understanding of the interactions between particles and trace gases in a typical city of the YRD region, continuous measurements of particles and trace gases were made at an urban site in Nanjing during cold seasons in 2016 in this study. The average of particles, including black carbon (BC), PM2.5, and PM10 are 2.602±1.720μg/m3, 58.2±36.8μg/m3, and 86.3±50.8μg/m3, respectively, while the average of trace gases, which contain CO, O3, NOx, and NOy, are 850.9±384.1, 37.7±33.5, 23.5±14.7, and 32.8±22.3ppb, respectively. Compared to National Ambient Air Quality Standards in China (NAAQS-CN), we found 48 days excess of PM2.5, 14 days excess of PM10, and 40 days excess of O3. The particles, CO, and nitrogen oxide concentrations shared a similar pattern of seasonality and diurnal cycles, which are different from O3. The former ones are all high in DJF and at rush hours, while the latter one had high loadings in the daytime, especially when the ultra violet (UV) was high. Correlation analysis reveals the formation of secondary aerosols, especially PM2.5, under high O3 and temperature conditions, and suggests a VOC-sensitive regime for photochemical production of O3 in urban Nanjing in cold seasons. Backward trajectory analysis suggests the prevailing winds in Nanjing were northerly and easterly during cold seasons in 2016. Air masses from eastern without passing through the urban agglomeration and those from northern without crossing BTH regions were cleaner, but air masses from local regions were more polluted in winter. A case study for a typical O3 and PM2.5 episode in December 2016 demonstrated that the episode was generally associated with regional transport and stable weather system. Air pollutants were mostly transported from the western areas with high emissions and weather conditions are controlled by anticyclone and high-pressure system in this region. This study further reveals the important effects of weather system and human activities on the environment in the YRD region, especially in the urban areas, and it's an urgent need for improving air quality in these areas.

Huimin Chen et al.
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