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DOI	10.5194/acp-20-11923-2020
	Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy
	Adachi K.; Oshima N.; Gong Z.; De Sá S.; Bateman A.P.; Martin S.T.; De Brito J.F.; Artaxo P.; Cirino G.G.; Iii A.J.S.; Buseck P.R.
发表日期	2020
ISSN	1680-7316
起始页码	11923
结束页码	11939
卷号	20 期号:20
英文摘要	The Amazon basin is important for understanding the global climate because of its carbon cycle and as a laboratory for obtaining basic knowledge of the continental background atmosphere. Aerosol particles play an important role in the climate and weather, and knowledge of their compositions and mixing states is necessary to understand their influence on the climate. For this study, we collected aerosol particles from the Amazon basin during the Green Ocean Amazon (GoAmazon2014/5) campaign (February to March 2014) at the T3 site, which is located about 70 km from Manaus, and analyzed them using transmission electron microscopy (TEM). TEM has better spatial resolution than other instruments, which enables us to analyze the occurrences of components that attach to or are embedded within other particles. Based on the TEM results of more than 10 000 particles from several transport events, this study shows the occurrences of individual particles including compositions, size distributions, number fractions, and possible sources of materials that mix with other particles. Aerosol particles during the wet season were from both natural sources such as the Amazon forest, Saharan desert, Atlantic Ocean, and African biomass burning and anthropogenic sources such as Manaus and local emissions. These particles mix together at an individual particle scale. The number fractions of mineral dust and sea-salt particles increased almost 3-fold when long-range transport (LRT) from the African continent occurred. Nearly 20 % of mineral dust and primary biological aerosol particles had attached sea salts on their surfaces. Sulfates were also internally mixed with sea-salt and mineral dust particles. The TEM element mapping images showed that several components with sizes of hundreds of nanometers from different sources commonly occur within individual LRT aerosol particles. We conclude that many aerosol particles from natural sources change their compositions by mixing during transport. The compositions and mixing states of these particles after emission result in changes in their hygroscopic and optical properties and should be considered when assessing their effects on climate. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; atmospheric transport; carbon cycle; mixing; particulate matter; sea salt; spatial resolution; transmission electron microscopy; Amazon Basin
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247461
作者单位	Department of Atmosphere Ocean and Earth System Modeling Research, Meteorological Research Institute, Tsukuba, Japan; School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Institute of Physics, University of São Paulo, São Paulo, Brazil; National Institute for Amazonian Research, Manaus, Amazonas, Brazil; Brookhaven National Laboratory, Upton, NY, United States; School of Earth and Space Exploration, School of Molecular Sciences, Arizona State University, Tempe, AA, United States; Harvard Business School, Boston, MA, United States; IMT Lille Douai, University of Lille, SAGE, Lille, 59000, France; Geosciences Institute, Federal University of Pará, Belém, Brazil
推荐引用方式 GB/T 7714	Adachi K.,Oshima N.,Gong Z.,et al. Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy[J],2020,20(20).
APA	Adachi K..,Oshima N..,Gong Z..,De Sá S..,Bateman A.P..,...&Buseck P.R..(2020).Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(20).
MLA	Adachi K.,et al."Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.20(2020).