Effects of transport on aerosols over the eastern slope of the Tibetan Plateau:synergistic contribution of Southeast Asia and the Sichuan Basin  

作　　者：SU Hong-Juan XIN Jin-Yuan MA Yong-Jing LIU Zirui WEN Tian-Xue WANG Shi-Gong FAN Guang-Zhou LI Wei WANG Lu HE Zhi-Ming WANG Yue-Si 

机构地区：[1]Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu University of Information Technology,Chengdu,China [2]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [3]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,China [4]Chinese Academy of Sciences,Institute of Mountain Hazards and Environment(IMHE),Chengdu,China [5]Jiangxi Weather Modification Office,Nanchang,Jiangxi Meteorological Bureau,China

出　　处：《Atmospheric and Oceanic Science Letters》2018年第5期425-431,共7页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program of China[grant numbers 2016YFC0202001 and 973Program 2014CB441200];the National Natural Science Foundation of China[grant numbers 41375036 and41305076]

摘　　要：The aerosol optical properties and chemical components of PM2.1(particulate matter with a diameter of 2.1μm or less)were investigated at Mount Gongga on the eastern slope of the Tibetan Plateau from April 2012 to December 2014.The annual mean aerosol optical depth(AOD)was 0.35±0.23,and the?ngstr?m exponent was 1.0±0.38.The AOD exhibited higher values in summer and winter,but lower values in spring and autumn.Dividing the observational periods into dry and wet seasons,the authors found that the concentrations of K^+,elemental carbon,secondary inorganic aerosols,and primary and secondary organic carbon in the dry(wet)season were 0.29(0.21),0.88(0.60),7.4(4.5),7.5(5.1),and 3.9(12)μg m?3,respectively.Combined with trajectory analysis,the authors found that higher concentrations of K^+,elemental carbon,and primary organic carbon indicated the effects of biomass burning from Southeast Asia during the dry season.However,the oxidation of volatile organic compounds was the main source of aerosols during the wet season,which originated from the Sichuan Basin.为探究南亚与四川盆地对青藏高原污染物传输的影响,论文利用青藏高原东坡区域背景站贡嘎山站2012–2014年地基观测数据,系统揭示了青藏高原东坡大气气溶胶浓度、化学成分与光学特性的变化特征。气溶胶光学厚度AOD年均值0.35左右,在夏冬季较高,春秋较低。干季钾离子(K+)、二次无机气溶胶(SIAs)与一次有机碳(POC)的浓度均高于湿季,湿季二次有机碳(SOC)为干季的3.1倍。结合后向轨迹分析,来自东南亚地区气团对应的高浓度K+、元素碳(EC)及POC表明生物质燃烧源对青藏高原东坡干季气溶胶有显著贡献;湿季气溶胶主要来源于四川盆地可挥发性有机物(VOCs)的氧化。

关 键 词：Tibetan Plateau aerosol optical depth aerosol components biomass burning regional transport 

分 类 号：P[天文地球]