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
投稿时间:2012-01-03  修订日期:2012-11-07  点此下载全文
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庞杨 南京信息工程大学 大气物理学院, 江苏 南京 210044
中国科学院 东亚区域气候—环境重点实验室, 北京 100029 
 
韩志伟 中国科学院 东亚区域气候—环境重点实验室, 北京 100029 hzw@mail.iap.ac.cn 
朱彬 南京信息工程大学 大气物理学院, 江苏 南京 210044  
李嘉伟 中国科学院 东亚区域气候—环境重点实验室, 北京 100029  
基金项目:国家重点基础研究发展计划(973计划)项目(2010CB428503);国家高技术研究发展计划(863计划)项目(2007AA06A408)
中文摘要: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O3和PM2.5的几次积累增加过程,其中O3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;PM2.5呈现南高北低的分布特征,变化范围为120~240 μg/m3。14时月平均O3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100~120 μg/m3。8月17日北京出现一次典型的高浓度O3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120 μg/m3,其中二次气溶胶质量浓度为50~100 μg/m3,一次排放人为气溶胶质量浓度为10~20 μg/m3,海盐质量浓度为1~7 μg/m3,二次气溶胶是该地区PM2.5的主要贡献者。
中文关键词: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
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 low at about 30×10-9 whereas relatively high O3 concentration (about 60×10-9) 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 60×10-9 in 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(80×10-9—110×10-9).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/m3 and 1—7 μg/m3,respectively.Thus,the secondary aerosols were the main contributor to PM2.5 in these areas during this episode.
keywords:O3  NO2  PM2.5  pollutant distribution and evolution  numerical simulation
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