Measuring size distributions of atmospheric aerosols using natural air ions скачать в хорошем качестве

Measuring size distributions of atmospheric aerosols using natural air ions

Title: Measuring size distributions of atmospheric aerosols using natural air ions Student chapter host: Clarkson University About the lecture: Electrical mobility size spectrometers are widely used to measure ambient aerosol number size distributions. A key component of these spectrometers is the neutralizer, which is used to place a stationary charge distribution on the aerosols. Yet, there are natural air ions in the atmosphere which are constantly conditioning atmospheric aerosols. We demonstrate that this natural charging process can be utilized by these spectrometers to measure size distributions of atmospheric aerosols without using a conventional neutralizer. This is achieved by measuring charged particles of both polarities, in contrast to only one polarity as conventionally done. Field measurements in urban Beijing and other sites will be presented. Speaker: Jingkun Jiang Jingkun Jiang is a professor at School of Environment, Tsinghua University. He received a BS and a MS in Environmental Science and Engineering from Tsinghua University. He holds a PhD degree in Energy, Environmental and Chemical Engineering from Washington University in St. Louis. Prior to joining Tsinghua in 2010, he served as a Postdoctoral Research Associate in the Particle Technology Laboratory of Mechanical Engineering Department, University of Minnesota. Dr. Jiang’s research activities involve various topics in aerosol science and technology: aerosol instrumentation; atmospheric new particle formation; PM formation and emissions from combustion activities. He has published more than 200 peer-reviewed journal articles. He received a number of awards including 2018 Smoluchowski Award, 2015 Asian Young Aerosol Scientist Award, and 2009 A&WMA Doctoral Dissertation Award. He is serving as an editor for Aerosol Science & Technology.