太湖北岸气溶胶光学特性长期变化特征  

Long-term variation of aerosol optical properties at Tai Lake's north bank

作　　者：韩亚芳[1] 吴立新[2] 白杨[2] 秦凯[1] HAN Ya-fang;WU Li-xin;BAI Yang;QIN Kai(School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221008, China;School of Geoscience and Info-Physics, Central South University, Changsha 410083, China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221008 [2]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《中国环境科学》2017年第7期2492-2503,共12页China Environmental Science

基　　金：2014年江苏双创团队基金资助项目(06014)

摘　　要：利用太湖北岸地基太阳光度计(CE-318)2005年9月~2016年4月的观测数据,以及多年气象观测资料,对太湖北岸气溶胶年际尺度、季节尺度及逐月的光学特性、变化特征及影响因素进行了系统分析.揭示太湖北岸:1)AOD年均值呈逐渐降低趋势,但累年(2005~2016)均值高达0.776,2005~2012年累年均值为0.842,较全国同一时期AOD均值高63%;2)AOD四季变化分明,夏季(0.920)最高、冬季(0.689)最低、春季(0.788)与秋季(0.788)相近;3)气溶胶α指数逐年增大,年增幅约0.013,表明太湖地区大气污染物颗粒平均粒径逐年减小,非自然源比重持续增加;4)气溶胶α指数季均值为秋季>冬季>夏季>春季,依次为1.320、1.232、1.164、1.098;5)体积谱四季均呈双峰结构,夏冬两季积聚模态粒子与粗模态粒子的体积浓度接近,春季以粗模态粒子为主,秋季以积聚模态粒子为主,6)气溶胶SSA季均值各年四季变化特征相似,累年总体季均值为秋季>夏季>春季>冬季,依次为0.933、0.917、0.900、0.882,但年均值自2007年起呈逐年缓增趋势,年增幅约0.006,表明太湖地区气溶胶粒子的散射能力在逐年增大.Using the sun photometer(CE-318)ground observationsat the north bank of Tai Lake together with in-situ meteorological observations from September2005to April2016,this paper analyzed systematically the long-term variation of aerosol optical properties at Tai Lake including annual,seasonal and monthly features as well as its influence factors.It was revealed that:1)the annual average of AOD(aerosol optical depth)from2005to2016reached0.776,while that from2005to2012was0.842and63%higher than the national average during the same time;2)the seasonalvariations of AOD were obviously featured with the highest value in summer(0.920),the lowest value in winter(0.689)and similar in spring(0.788)and autumn(0.788);3)the Angstrom factor displayed an gradually increasing trend and the annual increment reached0.013,which indicates that the average size of air pollutantparticulatesat Tai Lake was decreasing along with the increasing of non-natural source;4)the seasonal Angstrom value decreased from autumn to winter,summer and spring in order,followed by1.320,1.232,1.164,and1.098;5)the aerosol volume spectra showed a double-peak-structure in four seasons,and the volume concentrations of accumulation mode and coarse mode particulates were close in summer and winter,and the mainparticulatesinspring and autumn were coarse mode and accumulation mode,respectively;6)the annual seasonal variations of single scattering albedo(SSA)were similar,and the seasonal SSA value decreased from autumn to summer,springand winterin order,followed by0.933,0.917,0.900,and0.882,but the annual SSA averages displayed an increasing trend with annual increment being0.006since2007,which indicated that the scattering ability of aerosolparticulatesat Tai Lake was increasing gradually.

关 键 词：气溶胶 光学厚度 Angstrom波长指数 体积谱 单次散射反照率 变化特征 太湖 

分 类 号：X513[环境科学与工程—环境工程]