DOI: 10.1002/jgrd.503212013
论文题名: Changes of ns-soot mixing states and shapes in an urban area during CalNex
作者: Adachi K. ; Buseck P.R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 9 起始页码: 3723
结束页码: 3730
语种: 英语
Scopus关键词: Aerosols
; Light absorption
; Mixing
; Nanospheres
; Soot
; Transmission electron microscopy
; Aerosol particles
; Carbon nanosphere
; CO2 concentration
; Light amplification
; Optical calculations
; Organic aerosol
; TEM observations
; Transmission electron microscope
; Dust
; absorption
; aerosol
; sea salt
; soot
; urban area
; California
; Los Angeles [California]
; Mexico [North America]
; United States
; Auchenorrhyncha
英文摘要: Aerosol particles from megacities influence the regional and global climate as well as the health of their occupants. We used transmission electron microscopes (TEMs) to study aerosol particles collected from the Los Angeles area during the 2010 CalNex campaign. We detected major amounts of ns-soot, defined as consisting of carbon nanospheres, sulfate, sea salt, and organic aerosol (OA) and lesser amounts of brochosome particles from leaf hoppers. Ns-soot-particle shapes, mixing states, and abundances varied significantly with sampling times and days. Within plumes having high CO2 concentrations, much ns-soot was compacted and contained a relatively large number of carbon nanospheres. Ns-soot particles from both CalNex samples and Mexico City, the latter collected in 2006, had a wide range of shapes when mixed with other aerosol particles, but neither sets showed spherical ns-soot nor the core-shell configuration that is commonly used in optical calculations. Our TEM observations and light-absorption calculations ofmodeled particles indicate that, in contrast to ns-soot particles that are embedded within other materials or have the hypothesized core-shell configurations, those attached to other aerosol particles hardly enhance their light absorption. We conclude that the ways in which ns-soot mixes with other particles explain the observations of smaller light amplification by ns-soot coatings thanmodel calculations during the CalNex campaign and presumably in other areas. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: ATM0531926
; ATM1032312
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63439
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, Ibaraki 305-0052, Japan; Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, United States; Meteorological Research Institute, Tsukuba, Ibaraki, Japan
Recommended Citation:
Adachi K.,Buseck P.R.. Changes of ns-soot mixing states and shapes in an urban area during CalNex[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)