Measurement of aerosol number size distributions in the Yangtze River delta in China: Formation and growth of particles under polluted conditions |
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| Authors: | Jian Gao Tao Wang Xuehua Zhou Waishing Wu Wenxing Wang |
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| Institution: | 1. Environment Research Institute, Shandong University, Ji''nan, Shandong 250100, China;2. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Rice University, Department of Civil and Environmental Engineering, Houston, TX 77005, USA;2. Portland State University, Department of Mechanical and Materials Engineering, Portland, OR 97201, USA;3. University of Michigan, Department of Atmospheric, Ocean, and Space Sciences, Ann Arbor, MI 48109, USA;4. University of New Hampshire, Earth Systems Research Center, Durham, NH 03824, USA;5. University of California – Irvine, Department of Earth System Science, Irvine, CA 92697, USA;6. University of Houston, Department of Earth and Atmospheric Sciences, Houston, TX 77004, USA;1. Environment Research Institute, Shandong University, Ji''nan, Shandong, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Institute of Chemistry, Eötvös University, H-1518 Budapest, P.O. Box 32, Hungary;2. Department of Meteorology, Eötvös University, H-1518 Budapest, P.O. Box 32, Hungary;3. Department of Physical Sciences, FI-00014 University of Helsinki, P.O. Box 64, Finland;1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;4. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom;1. Environment Research Institute, Shandong University, Ji''nan, Shandong, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;3. Environmental Protection Department, Government of the Hong Kong Special Administrative Region, Hong Kong, China |
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| Abstract: | Particle size distribution is important for understanding the sources and effects of atmospheric aerosols. In this paper we present particle number size distributions (10 nm–10 μm) measured at a suburban site in the fast developing Yangtze River Delta (YRD) region (near Shanghai) in summer 2005. The average number concentrations of ultrafine (10–100 nm) particles were 2–3 times higher than those reported in the urban areas of North America and Europe. The number fraction of the ultrafine particles to total particle count was also 20–30% higher. The sharp increases in ultrafine particle number concentrations were frequently observed in late morning, and the particle bursts on 5 of the 12 nucleation event days can be attributed to the homogeneous nucleation leading to new particle formation. The new particle formation events were characterized with a larger number of nucleation-mode particles, larger particle surface area, and larger condensational sink than usually reported in the literature. These suggest an intense production of sulfuric acid from photo-oxidation of sulfur dioxide in the YRD. Overall, the growth rate of newly formed particles was moderate (6.4 ± 1.6 nm h?1), which was comparable to that reported in the literature. |
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