气候变化领域集成服务门户(CCPortal): Mixing State of Black Carbon Particles in Asian Outflow Observed at a Remote Site in Taiwan in the Spring of 2017

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DOI	10.1029/2020JD032526
	Mixing State of Black Carbon Particles in Asian Outflow Observed at a Remote Site in Taiwan in the Spring of 2017
	Sun C.; Adachi K.; Misawa K.; Cheung H.C.; Chou C.C.K.; Takegawa N.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	Anthropogenic emissions of aerosols and trace gases from East Asia have significant impacts on air quality and climate on regional and global scales. We conducted intensive measurements of aerosols at a remote site (Cape Fuguei; 25.30°N, 121.54°E) in Taiwan in the spring of 2017, focusing on the chemical composition and mixing state of aerosols in Asian outflow. A laser-induced incandescence–mass spectrometric analyzer (LII-MS) was used to measure the chemical composition of aerosols internally or externally mixed with black carbon (BC). Offline analysis by transmission electron microscopy (TEM) was used to characterize the mixing state of aerosols. The observation period was classified into long-range transport (LRT) periods and local pollution periods on the basis of cluster analysis of 3-day backward trajectories. LII-MS data showed that the average mass fractions of sulfate and nitrate internally mixed with BC were 7% ± 13% and 11% ± 15%, respectively, for high-pollution episodes during LRT periods. By TEM analysis of selected samples from LRT periods, the number fraction of aerosol particles internally mixed with BC was estimated to be 5%–36% for core–shell types and 5%–23% for attached types. Factors affecting the differences between LII-MS and TEM measurements are discussed. TEM data indicated the presence of a variety of aerosol mixing states in widespread regional pollution transported 500–1,000 km downwind of emission sources. Our results provide new constraints for three-dimensional models that might resolve the mixing state of aerosol particles, which are critical for accurately estimating the radiative impact of BC. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; aerosol mass spectrometry; black carbon; East Asia; electron microscopy; mixing state
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185810
作者单位	Graduate School of Science, Tokyo Metropolitan University, Tokyo, Japan; Meteorological Research Institute, Tsukuba, Japan; Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Now at School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Zhuhai, China; Also at Southern Laboratory of Ocean Science and Engineering, Zhuhai, China
推荐引用方式 GB/T 7714	Sun C.,Adachi K.,Misawa K.,et al. Mixing State of Black Carbon Particles in Asian Outflow Observed at a Remote Site in Taiwan in the Spring of 2017[J],2020,125(16).
APA	Sun C.,Adachi K.,Misawa K.,Cheung H.C.,Chou C.C.K.,&Takegawa N..(2020).Mixing State of Black Carbon Particles in Asian Outflow Observed at a Remote Site in Taiwan in the Spring of 2017.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Sun C.,et al."Mixing State of Black Carbon Particles in Asian Outflow Observed at a Remote Site in Taiwan in the Spring of 2017".Journal of Geophysical Research: Atmospheres 125.16(2020).