Aerosol and Clouds
Asian aerosols in North America: Frequency and concentration of fine dust
Article first published online: 28 DEC 2002
Copyright 2002 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 107, Issue D24, pages AAC 19-1–AAC 19-16, 27 December 2002
How to Cite
Asian aerosols in North America: Frequency and concentration of fine dust, J. Geophys. Res., 107(D24), 4804, doi:10.1029/2002JD002204, 2002., and ,
- Issue published online: 28 DEC 2002
- Article first published online: 28 DEC 2002
- Manuscript Accepted: 2 JUN 2002
- Manuscript Revised: 27 APR 2002
- Manuscript Received: 14 FEB 2002
Vol. 111, Issue D20, Article first published online: 21 OCT 2006
- North America;
 Using an elemental signature for Asian dust derived from events in April 1998, we probed a long-term set of routine aerosol samples to develop the first empirical assessment of the frequency and intensity of dust transport from Asia to midlatitude North America. Our data reveal a pattern of consistent, frequent transport that contradicts the episodic characterization derived from short-term studies and anecdotal reports. We find that fine (<2.5 μm) Asian dust is a regular component of the troposphere over the eastern Pacific and western North America and is common, at least in spring, across North America. Typical Asian fine dust concentrations (24-hour average) are between 0.2 and 1 μg/m3 and only very rarely exceed 5 μg/m3. Our data also indicate that Asian dust is concentrated in an altitude zone ranging from about 500 to 3000 m MSL, consistent with isentropic transport processes previously observed in the western Pacific.