DOI: 10.1016/j.atmosenv.2015.04.031
Scopus记录号: 2-s2.0-84930652770
论文题名: Comparison of the mixing state of long-range transported Asian and African mineral dust
作者: Fitzgerald E ; , Ault A ; P ; , Zauscher M ; D ; , Mayol-Bracero O ; L ; , Prather K ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 115 起始页码: 19
结束页码: 25
语种: 英语
英文关键词: Atmospheric processing
; Gobi Desert
; Mineral dust
; Sahara Desert
Scopus关键词: Aerosols
; Arid regions
; Atmospheric aerosols
; Atmospheric chemistry
; Atmospheric movements
; Budget control
; Drops
; Earth atmosphere
; Geochemistry
; Landforms
; Minerals
; Mixing
; Particle size
; Particulate emissions
; Aerosol particle sizes
; Atmospheric mineral dust
; Chemical characterization
; Gobi desert
; Heterogeneous chemistry
; Heterogeneous reactions
; Mineral dust
; Sahara desert
; Dust
; aluminum
; calcium
; iron
; iron 54
; mineral
; nitric acid
; oxalic acid
; potassium 40
; sodium 23
; titanium 48
; unclassified drug
; aerosol composition
; atmospheric pollution
; comparative study
; dust
; long range transport
; mixing
; radiation balance
; solar radiation
; aerosol
; African
; Article
; Asian
; atmospheric deposition
; atmospheric transport
; chemical composition
; cloud
; combustion
; comparative study
; desert
; electron microscopy
; mineral dust
; mineralogy
; particle size
; physical chemistry
; priority journal
; time of flight mass spectrometry
; Cheju [South Korea]
; China
; Gobi Desert
; Gosan
; Sahara
; South Korea
; Taklimakan Desert
; Xinjiang Uygur
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Mineral dust from arid regions represents the second largest global source of aerosols to the atmosphere. Dust strongly impacts the radiative balance of the earth's atmosphere by directly scattering solar radiation and acting as nuclei for the formation of liquid droplets and ice nuclei within clouds. The climate effects of mineral dust aerosols are poorly understood, however, due to their complex chemical and physical properties, which continuously evolve during atmospheric transport. This work focuses on characterizing atmospheric mineral dust from the two largest global dust sources: the Sahara Desert in Africa and the Gobi and Taklamakan Deserts in Asia. Measurements of individual aerosol particle size and chemical mixing state were made at El Yunque National Forest, Puerto Rico, downwind of the Sahara Desert, and Gosan, South Korea, downwind of the Gobi and Taklamakan Deserts. In general, the chemical characterization of the individual dust particles detected at these two sites reflected the dominant mineralogy of the source regions; aluminosilicate-rich dust was more common at El Yunque (~91% of El Yunque dust particles vs. ~69% of Gosan dust particles) and calcium-rich dust was more common at Gosan (~22% of Gosan dust particles vs. ~2% of El Yunque dust particles). Furthermore, dust particles from Africa and Asia were subjected to different transport conditions and atmospheric processing; African dust showed evidence of cloud processing, while Asian dust was modified via heterogeneous chemistry and direct condensation of secondary species. A larger fraction of dust detected at El Yunque contained the cloud-processing marker oxalate ion compared to dust detected at Gosan (~20% vs ~9%). Additionally, nearly 100% of dust detected at Gosan contained nitrate, showing it was aged via heterogeneous reactions with nitric acid, compared to only ~60% of African dust. Information on the distinct differences in the chemical composition of mineral dust particles, as well as the mechanisms and extent of atmospheric processing, is critical for assessing its impacts on the earth's radiative budget through scattering, absorption, and nucleating cloud droplets and ice crystals. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81674
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, United States; Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA, United States; Department of Environmental Science, University of Puerto Rico, San Juan, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Departments of Environmental Health Sciences and Chemistry, University of Michigan, Ann Arbor, MI, United States; Department of Chemistry and Biochemistry, University of San Diego, San Diego, CA, United States
Recommended Citation:
Fitzgerald E,, Ault A,P,et al. Comparison of the mixing state of long-range transported Asian and African mineral dust[J]. Atmospheric Environment,2015-01-01,115