瓦里关及西宁PM_(10)和多环芳烃谱分布的观测研究  

Observational Study of Spectral Distribution of Polycyclic Aromatic Hydrocarbons(PAHs) and PM_(10) in Waliguan and Xining

作　　者：汤莉莉[1,2] 牛生杰[1] 樊曙先[1] 乜虹[3] 高润祥[4] 金赛花[2] 杨关盈[2] 

机构地区：[1]江苏省气象灾害重点实验室,江苏南京210044 [2]南京信息工程大学环境科学与工程学院,江苏南京210044 [3]中国大气本底基准观象台,青海西宁810001 [4]天津市气象信息中心,天津300074

出　　处：《高原气象》2010年第1期236-243,共8页Plateau Meteorology

基　　金：江苏省自然科学基金项目(BK2007226);中国气象局气象软科学项目(GQR2009034);国家重点基础研究发展计划项目(2006CB403707);南京信息工程大学校科研基金项目资助

摘　　要：为了研究青海瓦里关和西宁PM10中多环芳烃污染特征及其来源,于2007年5月24日～6月1日在青藏高原东北部的瓦里关大气本底站和青海气象台进行了观测并各采集7组气溶胶样品,分析了PM10质量浓度、粒径分布和多环芳烃谱分布特征。结果表明,瓦里关PM10日均浓度为24.85μg.m-3,粒径分布呈三模态;西宁PM10日均浓度为65.25μg.m-3,呈明显双模态。瓦里关积聚态颗粒物质量百分比大于西宁观测点。瓦里关PM10中多环芳烃含量远低于同季节西宁地区,浓度值为8.38ng.m-3;高分子量的PAHs主要集中在细颗粒上,而粗颗粒上低分子量PAHs相对较多。两地区高分子量多环芳烃均为单峰分布。后向轨迹分析表明,瓦里关PM10中PAHs污染与西宁市以及黄河河谷工业带方向的输送密切相关。In an attempt to explore the polluting properties and sources of polycyclic aromatic hydrocarbons （PAHs） contained in PM10 at Waliguan and Xining stations of Qinghai Province, 7-group aerosol samples were gleaned at the Waliguan Atmospheric Background Observatory and Qinghai Station of Meteorology from May 24 to June 1, 2007. The mass concentration of PM10, size distribution and spectral distribution characteristics of polycyclic aromatic hydrocarbons were analyzed. The results show that the daily mean concentration of PM10 was 24. 85 μg·m^-1and particle size distribution was three-modes in Waliguan. The daily mean concentration of PM10 is 65.25 μg·m^-1 and particle size distribution is obvious dual-modes in Xining. The percentage of accumulative particle mass in Waliguan was greater than the ones of Xining. The concentration of PAHs of PM10 in Walguan was much lower than that ones in Xining in the same season, the concentration value was 8.38 ng · m-3. PAHs with high molecular weight were mainly distributed in the fine particles and PAHs with lower molecular weight were relatively richer in the coarse particle of Waliguan. High molecular weight polycyclic aromatic hydrocarbons in the two sample sites were single-peak distribution. Besides, the backward trajectory analysis indicates that the PAHs pollution in the study zone is bound up with industrial discharge from Xining and the Yellow basin.

关 键 词：西宁 瓦里关 多环芳烃 谱分布 PM10 

分 类 号：P402[天文地球—大气物理学与大气环境]