Numerical investigations on the contribution of point source emissions to the PM2.5 concentrations in Fairbanks, Alaska

Developmental Biology

Nicole Mölders¹  Huy N.Q. Tran¹ 

[1] University of Alaska Fairbanks, Geophysical Institute and College of Natural Science and Mathematics, Department of Atmospheric Sciences, 903 Koyukuk Dr., Fairbanks, AK 99775–7230, USA$$

关键词: WRF/Chem;    Point–source emissions;    High latitudes;    Winter air pollution;    PM2.5;   

DOI  :  10.5094/APR.2012.022

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

Simulations with and without consideration of emissions from point sources were performed with the Weather Research and Forecasting model with online chemistry (WRF/Chem) to examine the contribution of point source emissions to the PM_2.5 concentrations at breathing level in Fairbanks, Alaska during winter. On days and at locations where PM_2.5 concentrations exceed the National Ambient Air Quality Standard of 35 μg m ⁻³, emissions from point sources account for 4% of the 24 h–average PM_2.5 concentration on average. The locations of highest concentrations were the same in both simulations. Point source emissions induced only five additional exceedance days in the nonattainment area. The magnitude of the PM_2.5 concentrations depended on meteorological conditions (temperature, wind speed, mixing height) and emissions. The radius of impact of point source emissions on the PM_2.5 concentration at breathing level of about 10–12 km downwind results as a combination of low emission heights, low wind speeds and the presence of inversions.

【 授权许可】

Unknown   

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