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Volume 16, issue 17 | Copyright

Special issue: Pan-Eurasian Experiment (PEEX)

Special issue: BACCHUS – Impact of Biogenic versus Anthropogenic emissions...

Atmos. Chem. Phys., 16, 11337-11348, 2016
https://doi.org/10.5194/acp-16-11337-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 13 Sep 2016

Research article | 13 Sep 2016

Ambient measurement of fluorescent aerosol particles with a WIBS in the Yangtze River Delta of China: potential impacts of combustion-related aerosol particles

Xiawei Yu1,2, Zhibin Wang2, Minghui Zhang2, Uwe Kuhn2, Zhouqing Xie1, Yafang Cheng2, Ulrich Pöschl2, and Hang Su2 Xiawei Yu et al.
  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
  • 2Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany

Abstract. Fluorescence characteristics of aerosol particles in a polluted atmosphere were studied using a wideband integrated bioaerosol spectrometer (WIBS-4A) in Nanjing, Yangtze River Delta area of China. We observed strong diurnal and day-to-day variations of fluorescent aerosol particles (FAPs). The average number concentrations of FAPs (1–15µm) detected in the three WIBS measurement channels (FL1: 0.6cm−3, FL2: 3.4cm−3, FL3: 2.1cm−3) were much higher than those observed in forests and rural areas, suggesting that FAPs other than bioaerosols were detected. We found that the number fractions of FAPs were positively correlated with the black carbon mass fraction, especially for the FL1 channel, indicating a large contribution of combustion-related aerosols. To distinguish bioaerosols from combustion-related FAPs, we investigated two classification schemes for use with WIBS data. Our analysis suggests a strong size dependence for the fractional contributions of different types of FAPs. In the FL3 channel, combustion-related particles seem to dominate the 1–2µm size range while bioaerosols dominate the 2–5µm range. The number fractions of combustion-related particles and non-combustion-related particles to total aerosol particles were  ∼ 11 and  ∼ 5%, respectively.

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