|
|
DRUM >
College of Computer, Mathematical & Natural Sciences >
Atmospheric & Oceanic Science >
Atmospheric & Oceanic Science Research Works >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1903/8950
|
| Title: | Analysis of Summertime PM2.5 and haze in the Mid-Atlantic Region |
| Authors: | Chen, L.-W. Antony
Chow, Judith C.
Doddridge, Bruce G.
Dickerson, Russell R.
Ryan, William F.
Mueller, Peter K. |
| Type: | Article |
| Keywords: | haze formation
haze
pollution
atmosphere |
| Issue Date: | 2003 |
| Publisher: | Air & Waste Management Association (A&WMA) |
| Citation: | Analysis of Summertime PM2.5 and haze in the Mid-Atlantic Region, L-W.A. Chen, B.G. Doddridge, J.C. Chow, R.R. Dickerson, W.F. Ryan, and P.K. Mueller; JAWMA, 53(8), 946-956, 2003. |
| Abstract: | Observations of the mass and chemical composition of
particles less than 2.5 m in aerodynamic diameter
(PM2.5), light extinction, and meteorology in the urban
Baltimore-Washington corridor during July 1999 and July
2000 are presented and analyzed to study summertime
haze formation in the mid-Atlantic region. The mass fraction
of ammoniated sulfate (SO4
2) and carbonaceous
material in PM2.5 were each 50% for cleaner air (PM2.5
10 g/m3) but changed to 60% and 20%, respectively,
for more polluted air (PM2.5 30 g/m3). This signifies
the role of SO4
2 in haze formation. Comparisons of data
from this study with the Interagency Monitoring of Protected
Visual Environments network suggest that SO4
2 is
more regional than carbonaceous material and originates
in part from upwind source regions. The light extinction
coefficient is well correlated to PM2.5 mass plus water
associated with inorganic salt, leading to a mass extinction
efficiency of 7.6 1.7 m2/g for hydrated aerosol. The
most serious haze episode occurring between July 15 and 19, 1999, was characterized by westerly transport and
recirculation slowing removal of pollutants. At the peak
of this episode, 1-hr PM2.5 concentration reached 45
g/m3, visual range dropped to 5 km, and aerosol water
likely contributed to 40% of the light extinction coefficient. |
| URI: | http://hdl.handle.net/1903/8950 |
| Appears in Collections: | Atmospheric & Oceanic Science Research Works
|
All items in DRUM are protected by copyright, with all rights reserved.
|
