DOI: 10.1002/jgrd.50855
论文题名: The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S.
作者: Neff J.C. ; Reynolds R.L. ; Munson S.M. ; Fernandez D. ; Belnap J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11201
结束页码: 11212
语种: 英语
英文关键词: dust
; mineral aerosols
; PM10
; PM2.5
; TSP
Scopus关键词: Aerosols
; Air quality
; Arid regions
; Dust
; Median filters
; Minerals
; Particles (particulate matter)
; Arid and semi-arid regions
; Elevated concentrations
; Measurement of particles
; Mineral aerosols
; PM10
; PM2.5
; Total suspended particles
; TSP
; Storms
; air quality
; concentration (composition)
; diameter
; dust storm
; particle size
; soil erosion
; Canyonlands National Park
; Colorado
; Mesa Verde
; United States
; Utah
英文摘要: Mineral aerosols are produced during the erosion of soils by wind and are a common source of particles (dust) in arid and semiarid regions. The size of these particles varies widely from less than 2 μm to larger particles that can exceed 50 μm in diameter. In this study, we present two continuous records of total suspended particle (TSP) concentrations at sites in Mesa Verde and Canyonlands National Parks in Colorado and Utah, USA, respectively, and compare those values to measurements of fine and coarse particle concentrations made from nearby samplers. Average annual concentrations of TSP at Mesa Verde were 90 μg m-3 in 2011 and at Canyonlands were 171 μg m -3 in 2009, 113 μg m-3 in 2010, and 134 μg m -3 in 2011. In comparison, annual concentrations of fine (diameter of 2.5 μm and below) and coarse (2.5-10 μm diameter) particles at these sites were below 10 μg m-3 in all years. The high concentrations of TSP appear to be the result of regional dust storms with elevated concentrations of particles greater than 10 μm in diameter. These conditions regularly occur from spring through fall with 2 week mean TSP periodically in excess of 200 μg m-3. Measurement of particles on filters indicates that the median particle size varies between approximately 10 μm in winter and 40 μm during the spring. These persistently elevated concentrations of large particles indicate that regional dust emission as dust storms and events are important determinants of air quality in this region. Key Points TSP concentrations are highly elevated at two sites in the western US mineral aerosols are dominated by particles larger than 10 u in diameter The spring/summer elevation of aerosols is related to dust storms ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63266
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: Geological Sciences Department and Environmental Studies Program, University of Colorado, 2200 Colorado Blvd, Campus Box 399, Boulder, CO 80309, United States; U.S. Geological Survey, Denver CO, United States; U.S. Geological Survey, Moab UT, United States
Recommended Citation:
Neff J.C.,Reynolds R.L.,Munson S.M.,et al. The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S.[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)