Ozone and fine particle in the western Yangtze River Delta: an overview of 1 yr data at the SORPES station 1Institute for Climate and Global Change Research & School of Atmospheric Sciences, Nanjing University, Nanjing, 210093, China
14 Jun 2013
2Department of Physics, University of Helsinki, 00014 Helsinki, Finland
Received: 08 Jan 2013 – Published in Atmos. Chem. Phys. Discuss.: 28 Jan 2013Abstract. This work presents an overview of 1 yr measurements of ozone (O3) and
fine particular matter (PM2.5) and related trace gases at a recently
developed regional background site, the Station for Observing Regional
Processes of the Earth System (SORPES), in the western part of the Yangtze
River Delta (YRD) in eastern China. Ozone and PM2.5 showed strong seasonal
cycles but with contrast patterns: O3 reached a maximum in warm seasons
but PM2.5 in cold seasons. Correlation analysis suggests a
VOC-sensitive regime for O3 chemistry and a formation of secondary
aerosols under conditions of high O3 in summer. Compared with the
National Ambient Air Quality Standards in China, our measurements report 15
days of O3 exceedance and 148 days of PM2.5 exceedance during the
1 yr period, suggesting a severe air pollution situation in this region.
Case studies for typical O3 and PM2.5 episodes demonstrated that
these episodes were generally associated with an air mass transport pathway
over the mid-YRD, i.e., along the Nanjing–Shanghai axis with its city
clusters, and showed that synoptic weather played an important role in air
pollution, especially for O3. Agricultural burning activities caused
high PM2.5 and O3 pollution during harvest seasons, especially in
June. A calculation of potential source contributions based on Lagrangian
dispersion simulations suggests that emissions from the YRD contributed to
over 70% of the O3 precursor CO, with a majority from the mid-YRD.
North-YRD and the North China Plain are the main contributors to PM2.5
pollution in this region. This work shows an important environmental impact
from industrialization and urbanization in the YRD region, and suggests an
urgent need for improving air quality in these areas through collaborative
control measures among different administrative regions.
Revised: 09 Apr 2013 – Accepted: 13 May 2013 – Published: 14 Jun 2013
Citation: Ding, A. J., Fu, C. B., Yang, X. Q., Sun, J. N., Zheng, L. F., Xie, Y. N., Herrmann, E., Nie, W., Petäjä, T., Kerminen, V.-M., and Kulmala, M.: Ozone and fine particle in the western Yangtze River Delta: an overview of 1 yr data at the SORPES station, Atmos. Chem. Phys., 13, 5813-5830, doi:10.5194/acp-13-5813-2013, 2013.