State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Sci Total Environ. 2019 May 15;665:1095-1102. doi: 10.1016/j.scitotenv.2019.02.100. Epub 2019 Feb 8.
In this study, a novel setup was developed to measure the vertical profile of particle number size distribution (PNSD) and meteorological parameters by using hexacopter equipped with a portable instrument package including a custom-built scanning mobility particle sizer, an optical particle counter and temperature and relative humidity (RH) sensors. By using this setup, a field experiment was carried out to investigate the vertical profiles of RH, temperature, PNSD ranged from 8 to 245 nm, and particle number concentration with the diameter ranges of 0.3-0.5 μm and 0.5-1.0 μm from the ground up to 300 m above ground level in a rural site of the North China Plain. New particle formation (NPF) event in a vertical scale was observed during the daytime cruises. The newly formed particles showed a heterogeneous vertical distribution, indicating the inhomogeneous occurrence of the NPF event vertically. During the daytime, the vertical variations in number concentration of particles larger than 0.3 μm was not obvious, while, showed a tendency to decrease associated with the increasing altitude in the evening. The newly-developed unmanned aerial vehicle research platform could be applied to study the vertical NPF events and transport processes of air pollutants within the atmospheric boundary layer and urban canopy, and to monitor source emissions with the purpose of environment management.
在这项研究中，开发了一种新的设置，通过使用配备有便携式仪器套件的六旋翼飞行器来测量颗粒数浓度粒径分布（PNSD）和气象参数，该套件包括一个定制的扫描迁移率颗粒粒径仪、一个光学颗粒计数器以及温度和相对湿度（RH）传感器。通过使用该设置，在华北平原的一个农村地区进行了现场实验，以调查从地面到 300 米高空的 RH、温度、粒径为 8 到 245nm 的 PNSD 以及粒径为 0.3-0.5μm 和 0.5-1.0μm 的颗粒数浓度的垂直分布。在日间巡航过程中观察到了新粒子形成（NPF）事件在垂直尺度上的发生。新形成的颗粒表现出不均匀的垂直分布，表明 NPF 事件在垂直方向上不均匀地发生。在白天，大于 0.3μm 的颗粒数浓度的垂直变化不明显，而在傍晚则表现出随着海拔升高而减少的趋势。新开发的无人机研究平台可用于研究大气边界层和城市冠层内的垂直 NPF 事件和空气污染物的传输过程，并监测源排放，以达到环境管理的目的。
