| 利用WRF-Chem模拟研究京津冀地区夏季大气污染物的分布和演变 |
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| 引用本文： | 庞杨,韩志伟,朱彬,李嘉伟.利用WRF-Chem模拟研究京津冀地区夏季大气污染物的分布和演变[J].南京气象学院学报,2013(6):674-682. |
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| 作者姓名： | 庞杨 韩志伟 朱彬 李嘉伟 |
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| 作者单位： | [1]南京信息工程大学大气物理学院,江苏南京210044 [2]中国科学院东亚区域气候-环境重点实验室,北京100029 |
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| 摘 要： | 应用WRF—Chem（Weather Research and Forecasting Model with Chemistry）模式模拟研究了2007年8月京津冀地区近地面O3、NO2、PM2.5浓度的时空变化特征，将模拟结果与观测数据进行详细对比，结果表明，模式可以较好地模拟O3、PM2.5，浓度的空间分布和时间变化特征，成功再现了8月33和PM2.5的几次积累增加过程，其中O，的模拟值与观测值的相关系数为0．69～0．86，PM2.5的相关系数为0．44～0．49，但模式对NO2的模拟相对较差，相关系数为0．27～0．43。北京、天津地区为O3月均低值区，月均体积浓度约30×10^-9，渤海及京津冀以西地区O3月平均体积浓度可达60×10^-9；PM2，呈现南高北低的分布特征，变化范围为120～240μg／m3。14时月平均03体积浓度在北京、天津地区低于周边地区，约为60×10^-9；而PM2.5质量浓度在环渤海地区和河北南部较高，为100～120μg/m^3。8月17日北京出现一次典型的高浓度O，污染事件，14时北京地区温度达到33℃，O3体积浓度为80×10^-9～110×10^-9。在局地排放、化学反应和外来输送的共同作用下，渤海西岸和北岸PM2.5的质量浓度超过120μg／m3，其中二次气溶胶质量浓度为50～100μg／m3，一次排放人为气溶胶质量浓度为10～20μg／m3，海盐质量浓度为1～7μg／m3，二次气溶胶是该地区PM2.5的主要贡献者。
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| 关 键 词： | O3 NO2 PM2 5 污染物分布和演变 数值模拟 |
A model study on distribution and evolution of atmospheric pollutants over Beijing-Tianjin-Hebei region in summertime with WRF-Chem |
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| PANG Yang,HAN Zhi-wei,ZHU Bin,LI Jia-wei.A model study on distribution and evolution of atmospheric pollutants over Beijing-Tianjin-Hebei region in summertime with WRF-Chem[J].Journal of Nanjing Institute of Meteorology,2013(6):674-682. |
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| Authors: | PANG Yang HAN Zhi-wei ZHU Bin LI Jia-wei |
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| Institution: | 2 ( 1. School of Atmospheric Physics, NUIST, Nanjing 210044, China; 2. Key Laboratory of Regional Climate-Environment for East Asia (RCE-TEA), Chinese Academy of Sciences, B eijing 100029, China) |
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| Abstract: | In this paper, the WRF-Chem model was used to analyze the temporal and spatial variations of the near-surface concentrations of ozone （ 03 ）, 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 vari- ations of 03 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 03 ,0.440. 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 low at about 30 x 10 -9 whereas relatively high P3 concentration （ about 60 x 10 -9 ） was predicted in the west of the Beijing-Tianjin-Hebei region and over the Bohai Bay. The PM2. 5 showed higher concentra- tion levels in the south than in the north within the Beijing-Tianjin-Hebei region with the monthly mean concentrations ranging from 120 to 240μg/m3. The monthly mean 03 concentration at 14：00 BST in August was about 60 x 10-9 in Beijing and Tianjin, which was lower than those in the surrounding are- as. The mean PM2.5 concentrations at 14：00 BST showed higher levels（ 100-120 μg/m3） in the south- ern 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 03 （80 ×10-9-110 × 10-9）. Meanwhile ,due to the combined effects of local emission, chemical reac- tion 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 50-100μg/m3, 10--20 μg/m3 and 1--7 μg/m3 ,respectively. Thus, the secondary aerosols were the main con- tributor to PM2. 5 in these areas during this episode. |
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| Keywords: | O3 NO2 PM2 5 pollutant distribution and evolution numerical simulation |
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