北京雾霾天气期间气溶胶光学特性  

Optical Properties of Aerosol During Haze-Fog Episodes in Beijing

作　　者：于兴娜[1,2] 李新妹 登增然登 德庆央宗 袁帅[2] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044 [2]南京信息工程大学大气物理学院,南京210044 [3]中国民用航空呼伦贝尔空中交通管理站,呼伦贝尔021008 [4]西藏自治区日喀则地区拉孜县气象局,拉孜858100 [5]西藏自治区林芝地区察隅县气象局,察隅806600

出　　处：《环境科学》2012年第4期1057-1062,共6页Environmental Science

基　　金：国家自然科学基金项目(41005089);高等学校博士学科点专项科研基金项目(20103228120004);江苏省高校自然科学基金项目(10KJB170009);公益性行业(气象)科研专项(GYHY(QX)2007-6-36);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了解北京地区雾霾天气条件下大气气溶胶的光学特性,利用2002～2008年AERONET资料分析了雾霾天气期间气溶胶光学厚度、Angstrom波长指数、粒子尺度谱分布和单次散射反照率等气溶胶光学特性参数.结果表明,北京地区雾霾天气期间气溶胶光学厚度表现出较高值,且随波长增大而减小,440 nm时平均气溶胶光学厚度达到1.34.Angstrom波长指数在雾霾天气时也表现出较高值,平均值达到1.11;其中高于0.9的波长指数出现频率达到94%,说明北京雾霾天气期间气溶胶粒子主要以细粒子为主.气溶胶体积尺度谱分布表现出双峰型结构,细模态的平均峰值半径随光学厚度增大而增大,而粗模态的平均峰值半径却随光学厚度增大表现出减小趋势;气溶胶粒子尺度谱中的主模态峰与光学厚度有关.雾霾天气期间平均单次散射反照率达到0.89,且随光学厚度增大表现出依次增大趋势,但对波长变化表现不敏感.The purpose of this study is to investigate the optical properties of aerosol during haze-fog episodes in Beijing. The aerosol optical depth （AOD） , Angstrom exponent （a） , size distribution and single scattering albedo （to） during haze-fog episodes were analyzed between 2002 and 2008 using AERONENT data. During haze-fog episodes, the aerosol optical depth showed a decreasing trend with wavelengths, and showed high values with an average 1.34 at 440 nm. The magnitude of Angstrom exponent was relatively high during haze-fog episodes and the mean values reached 1. 11. The frequency distribution of a was up to 94% when a 〉 0.9, indicating the predominance of fine particles during haze-fog episodes in Beijing. The aerosol volume size distributions presented a bimodal structure （fine and coarse modes）. The maxima （peaks） radius of fine mode showed an increasing trend with AOD, however, those of coarse mode showed a decreasing trend with AOD. The size distribution showed a distinct difference in dominant mode for the different AOD. The single scattering albedo showed an increasing trend with AOD during haze-fog episodes in Beijing. The mean value of to was 0. 89 at the four wavelengths and the to exhibited a low sensitivity to wavelengths.

关 键 词：北京 雾 霾 气溶胶 光学特性 

分 类 号：X513[环境科学与工程—环境工程]