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Discussion papers | Copyright
https://doi.org/10.5194/acpd-13-1455-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Jan 2013

Research article | 15 Jan 2013

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This discussion paper is a preprint. It has been under review for the journal Atmospheric Chemistry and Physics (ACP). The revised manuscript was not accepted.

New particle formation in the western Yangtze River Delta: first data from SORPES-station

E. Herrmann1,2, A. J. Ding1, T. Petäjä2, X. Q. Yang1, J. N. Sun1, X. M. Qi1, H. Manninen2, J. Hakala2, T. Nieminen2, P. P. Aalto2, V.-M. Kerminen2, M. Kulmala2, and C. B. Fu1 E. Herrmann et al.
  • 1School of Atmospheric Sciences and Institute for Climate and Global Change Research, Nanjing University, Nanjing, China
  • 2Department of Physics, University of Helsinki, Helsinki, Finland

Abstract. Aerosols and new particle formation were studied in the western part of the Yangtze River Delta (YRD), at the SORPES station of Nanjing University. Air ions between 0.8 and 42 nm were measured using an air ion spectrometer; a DMPS provided particle size distributions between 6 and 800 nm. Additionally, meteorological data, trace gas concentrations, and PM2.5 values were recorded. During the measurement period from 18 November 2011 to 31 March 2012, the mean total particle concentration was found to be 23 000 cm−3. The mean PM2.5 value was 90 μ g m−3, well above national limits. During the observations, 26 new particle formation events occurred, typically producing 6 nm particles at a rate of 1 cm−3 s−1, resulting in over 4000 cm−3 new CCN per event. Typical growth rates were between 6 and 7 nm h−1. Ion measurements showed the typical cluster band below 2 nm, with total ion concentrations roughly between 600 and 1000 cm−3. A peculiar feature of the ion measurements were the heightened ion cluster concentrations during the nights before event days. The highly polluted air of the YRD provides both the potential source (SO2) and the sink (particulate matter) for sulfuric acid, leaving radiation as the determining force behind new particle formation. Accordingly, a good correlation was found between new particle formation rate and radiation values.

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