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The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S.

Journal of Geophysical Research D: Atmospheres

By:
, , , ,
DOI: 10.1002/jgrd.50855

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Abstract

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.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S.
Series title:
Journal of Geophysical Research D: Atmospheres
DOI:
10.1002/jgrd.50855
Volume
118
Issue:
19
Year Published:
2013
Language:
English
Publisher:
American Geophysical Union
Contributing office(s):
Southwest Biological Science Center
Description:
12 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
11201
Last page:
11212
Number of Pages:
12
Country:
United States
State:
Colorado;Utah
Other Geospatial:
Canyonlands National Park;Mesa Verde National Park