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- W2352512403 abstract "In this paper,the WRF-Chem model was used to analyze the temporal and spatial variations of the near-surface concentrations of ozone( O3),nitrogen dioxide( NO2) and fine particulate matter( PM2. 5) over the Beijing-Tianjin-Hebei region in August 2007. The simulation results were compared with surface observations. It was indicated that the model could reproduce the temporal and spatial variations of O3 and PM2. 5 reasonably well and successfully reflect several pollution events in August 2007. However,the model's performance was relatively poor for NO2. The correlation coefficients between the model simulations and the observations were 0. 69—0. 86 for O3,0. 44—0. 49 for PM2. 5 and 0. 27—0. 43 for NO2. In August,the monthly mean concentration of O3 in Beijing and Tianjin was relatively lowat about 30 × 109 whereas relatively high O3 concentration( about 60 × 109) was predicted in the west of the Beijing-Tianjin-Hebei region and over the Bohai Bay. The PM2. 5 showed higher concentration levels in the south than in the north within the Beijing-Tianjin-Hebei region with the monthly mean concentrations ranging from 120 to 240 μg / m3. The monthly mean O3 concentration at 14: 00 BST in August was about 60 × 109in Beijing and Tianjin,which was lower than those in the surrounding areas. The mean PM2. 5 concentrations at 14: 00 BST showed higher levels( 100—120 μg / m3) in the southern parts of the Hebei province and the Bohai Bay areas. An O3 pollution episode occurred on August 17 when the air temperature in Beijing reached 33 ℃ at 14: 00 BST,resulting in high concentration of O3( 80 ×109—110 ×109). Meanwhile,due to the combined effects of local emission,chemical reaction and trans-boundary transport,the PM2. 5 concentration in the west and the north of the Bohai bay was as high as over 120 μg / m3,in which the secondary aerosols formed through chemical reactions,the primary anthropogenic aerosols released directly and sea salt aerosols accounted for about 50—100 μg / m3,10—20 μg /m3and 1— 7 μg / m3,respectively. Thus,the secondary aerosols were the main contributor to PM2. 5 in these areas during this episode." @default.
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- W2352512403 date "2013-01-01" @default.
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- W2352512403 title "A model study on distribution and evolution of atmospheric pollutants over Beijing-Tianjin-Hebei region in summertime with WRF-Chem" @default.
- W2352512403 hasPublicationYear "2013" @default.
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