caa a22 4500 606200274 CHVBK 20210128100943.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10653-014-9668-6 doi (NATIONALLICENCE)springer-10.1007/s10653-014-9668-6 Origin of non-spherical particles in the boundary layer over Beijing, China: based on balloon-borne observations [Elektronische Daten] [Bin Chen, Maromu Yamada, Yasunobu Iwasaka, Daizhou Zhang, Hong Wang, Zhenzhu Wang, Hengchi Lei, Guangyu Shi] Vertical structures of aerosols from the ground to about 1,000m altitude in Beijing were measured with a balloon-borne optical particle counter. The results showed that, in hazy days, there were inversions at approximately 500-600m, 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. Springer Science+Business Media Dordrecht, 2014 Vertical mixing nationallicence Boundary layer nationallicence Tethered balloon nationallicence Aerosol nationallicence Beijing nationallicence Chen Bin Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Beijing, China aut Yamada Maromu Center for Innovation, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Iwasaka Yasunobu Center for Innovation, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Zhang Daizhou Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, 862-8502, Kumamoto, Japan aut Wang Hong Chinese Academy of Meteorological Sciences (CAMS), 100081, Beijing, China aut Wang Zhenzhu Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Beijing, China aut Lei Hengchi Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Shi Guangyu Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Environmental Geochemistry and Health Springer Netherlands 37/5(2015-10-01), 791-800 0269-4042 37:5<791 2015 37 10653 https://doi.org/10.1007/s10653-014-9668-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10653-014-9668-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Bin Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Beijing, China aut NATIONALLICENCE 700 1- Yamada Maromu Center for Innovation, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Iwasaka Yasunobu Center for Innovation, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Zhang Daizhou Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, 862-8502, Kumamoto, Japan aut NATIONALLICENCE 700 1- Wang Hong Chinese Academy of Meteorological Sciences (CAMS), 100081, Beijing, China aut NATIONALLICENCE 700 1- Wang Zhenzhu Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Beijing, China aut NATIONALLICENCE 700 1- Lei Hengchi Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 700 1- Shi Guangyu Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 773 0- Environmental Geochemistry and Health Springer Netherlands 37/5(2015-10-01), 791-800 0269-4042 37:5<791 2015 37 10653