NDLI: Origin of non-spherical particles in the boundary layer over Beijing, China: based on balloon-borne observations

Content Provider	Springer Nature Link
Author	Chen, Bin Yamada, Maromu Iwasaka, Yasubu Zhang, Daizhou Wang, Hong Wang, Zhenzhu Lei, Hengchi Shi, Guangyu
Copyright Year	2014
Abstract	Vertical structures of aerosols from the ground to about 1,000 m altitude in Beijing were measured with a balloon-borne optical particle counter. The results showed that, in hazy days, there were inversions at approximately 500–600 m, below which the particulate matters were well mixed vertically, while the concentration of particles decreased sharply above the mixing layer. Electron microscopic observation of the particles collected with the balloon-borne impactor indicates that the composition of particles is different according to weather conditions in the boundary mixing layer of Beijing city and suggests that dust particles are always dominant in coarse-mode particles. Interestingly, sea-salt particles are frequently identified, suggesting the importance of marine air inflow to the Beijing area even in summer. The Ca-rich spherical particles are also frequently identified, suggesting chemical modification of dust particle by NOx or emission of CaO and others from local emission. Additionally, those types of particles showed higher concentration above the mixing layer under the relatively calm weather condition of summer, suggesting the importance of local-scale convection found in summer which rapidly transported anthropogenic particles above the mixing layer. Lidar extinction profiles qualitatively have good consistency with the balloon-borne measurements. Attenuation effects of laser pulse intensity are frequently observed due to high concentration of particulate matter in the Beijing atmosphere, and therefore quantitative agreement of lidar return and aerosol concentration can be hardly observed during dusty condition. Comparing the depolarization ratio obtained from the lidar measurements with the balloon-borne measurements, the contribution of the dry sea-salt particles, in addition to the dust particles, is suggested as an important factor causing depolarization ratio in the Beijing atmosphere.
Starting Page	791
Ending Page	800
Page Count	10
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	37
Issue Number	5
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-12-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vertical mixing Boundary layer Tethered balloon Aerosol Beijing Environmental Health Geochemistry Terrestrial Pollution Soil Science & Conservation Environmental Chemistry Public Health
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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