京津冀及周边地区PM_(2.5)传输规律研究  

Study on transportation of PM_(2.5) in Beijing-Tianjin-Hebei(BTH) and its surrounding area

作　　者：王晓琦[1] 郎建垒[1] 程水源[1] 陈国磊[1] 刘晓宇[1] WANG Xiao-qi;LANG Jian-lei;CHENG Shui-yuan;CHEN Guo-lei;LIU Xiao-yu(Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学区域大气复合污染防治北京市重点实验室,北京100124

出　　处：《中国环境科学》2016年第11期3211-3217,共7页China Environmental Science

基　　金：国家自然科学基金(91544232);国家环保公益性行业科研专项(201409006);北京市科技计划(Z141100001014002)

摘　　要：本研究采用WRF-CAMx模型对京津冀及周边7省市PM2.5与SIA组分传输规律进行了研究,定量估算了京津冀地区PM2.5与SIA的空间来源贡献,并得到了各省市之间的传输矩阵.结果表明,PM2.5与SIA组分跨区域传输作用较为显著.京津冀区域PM2.5与SIA组分外来源年均贡献分别为23.4%和45.5%.京津冀及周边各省市年均PM2.5与SIA组分受本地排放影响分别为51.2%~68.8%与36.7%~56.4%.结合后向轨迹模型对北京市2013年1月4次重污染过程的空间来源进行了分析,发现各过程污染气团来向有明显差异,分别由西北方向长距离传输、南部短距离传输以及西南、东南方向局地气团输入.4次重污染过程PM2.5区域传输作用显著,北京PM2.5及SIA本地源贡献分别为35.1%~37.3%与17.1%~28.4%;其中偏南方向气团输入时,北京污染程度更高,且受京津冀排放源贡献较大,PM2.5和SIA贡献率最高可达82.3%和76.4%.WRF-CAMx modeling system was developed to examine the regional transportation of PM2.5 and secondaryinorganic aerosol (SIA) in Beijing-Tianjin-Hebei (BTH) and its surrounding provinces. Regional emission contribution tothe PM2.5 and SIA of BTH was estimated, and the transmission matrix among different provinces was also obtained.Results showed that regional transmission effect of PM2.5 and SIA components was comparatively significant. PM2.5 andSIA of BTH contributed by emissions from outside region was 23.4% and 45.5%, respectively. Local emissionscontributed 51.2%~68.8% of the annual average PM2.5 and 36.7%~56.4% of the SIA in each province and city. Sources ofthe four severe pollution processes in January 2013 of Beijing were analyzed combining backward trajectory model; and itwas found that the sources were quite different from each other, including long distance transportation from northwestdirection, short distance transportation from the south and local air-mass transportation from southwest and southeast.Regional transportation was more obviously during the severe pollution processes, PM2.5 and SIA contributed by localemissions were only 35.1%~37.3% and 17.1%~28.4%, respectively. Among that, air-mass transported from southern partcould lead to higher pollution level; and the contributions from emissions of BTH was remarkable, they reached 83.2%and 76.4% for PM2.5 and SIA, respectively.

关 键 词：WRF-CAMx 区域传输 重污染过程 后向轨迹 

分 类 号：X513[环境科学与工程—环境工程]