长江中下游地区PM_(2.5)传输规律分析  

Analysis of the Transportation of PM_(2. 5) in the Middle and Lower Reaches of the Yangtze River

作　　者：孙超[1] 郎建垒[1] 孙晓伟[1] Sun Chao;Lang Jianlei;Sun Xiaowei(Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Teehnology,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：《环境保护科学》2018年第4期27-34,共8页Environmental Protection Science

基　　金：北京市科学技术委员会(Z161100004516013&Z171100002217002)基金资助

摘　　要：采用WRF-CAMx-PSAT模式对长江中下游地区PM_(2.5)传输规律进行模拟研究,定量估算长江中下游地区典型城市PM_(2.5)空间来源贡献,分析区域传输的季节变化规律。结果表明,典型城市省内年均贡献率为39.7%~83.2%,省外年均贡献率为16.8%~60.3%,秋冬季污染物区域传输贡献较高,春夏季较低。结合后向轨迹模型对长江中下游典型城市—武汉市2015年1月3次重污染过程的空间来源进行分析,发现各过程污染气团来向差异明显,分别由北部、北部偏东、西北部长距离、西北部短距离气团输入。北部气团输入时,区域传输贡献显著。两次重污染过程,山东、安徽、河南、河北4省对其贡献总共为41.5%和48.2%,省内贡献为51.1%和40.3%;当西北部气团输入时,4省对其贡献仅为15.6%,但省内贡献较高,达74.9%。In this paper,the WRF-CAMx-PSAT model was developed to simulate the regional transportation of PM2.5 in the middle and lower reaches of the Yangtze River. Regional emission contribution to PM2.5 in the typical cities was estimated quantitatively and the seasonal variation of the regional transportation was analyzed. The results showed that the average annual contribution rates of typical cities within the province were from 39. 7% to 83. 2%,and those without the province were from16. 8% to 60. 3%. The contribution of regional transportation in autumn and winter was higher than that in spring and summer.Sources of the three severe pollution processes in the typical city of Wuhan in January 2015 were analyzed combing backward the trajectory model,and it was found that the sources were quite different from each other including long distance transportation from north,northeast,northwest and short distance from northwest. When the air mass was transported from north, the regional contribution was most remarkable. The total contribution of Shandong,Anhui,Henan,and Hebei provinces to Wuhan were41. 5% and 48. 2% in two severe processes, and Hubei province contributed 51. 1% and 40. 3%. When the air mass was transported from northwest,four provinces contributed only 15. 6%,while Hubei province contributed 74. 9%.

关 键 词：长江中下游地区 区域传输 WRF-CAMx-PSAT 重污染过程 后向轨迹 

分 类 号：X513[环境科学与工程—环境工程]