西安地区气溶胶光学特性研究  

Study on Aerosol Optical Property in Xi′an Region

作　　者：董自鹏[1] 李星敏[1] 杜川利[1] 张高健 

机构地区：[1]陕西省气象科学研究所,陕西西安710014 [2]泾河国家基准气候站,陕西西安710201

出　　处：《高原气象》2013年第3期856-864,共9页Plateau Meteorology

基　　金：陕西省气象局重点项目"关中主要城市发展对大气环境影响的初步研究"(2010Z-6);陕西省气象局科技创新基金计划项目"西安市气溶胶光学特性研究"(2011M-18)共同资助

摘　　要：利用2008年5月—2009年4月和2010年4月—2011年3月两年的太阳光度计CE318数据,分析了西安地区气溶胶光学厚度(AOD)和波长指数(α)的时间变化特征。结果表明,受局地污染和地形影响,泾河站的AOD全年较高,两个时段的年平均值分别为0.69±0.40和0.67±0.39,AOD和α的最大值都发生在夏季;受沙尘天气影响,气溶胶波长指数春季最小,AOD秋季最小。CE318和MODISAOD的对比结果表明,两者有较好的相关性,符合MODIS设计精度的数据占55.0%～73.3%。2008—2010年MODIS AOD平均值的空间分布表明,陕西境内存在3个AOD高值区,分别位于关中盆地、汉中市区和安康市区,局地污染和地形影响是造成AOD高值区的主要原因。The characteristics of Aerosol Optical Depth （AOD） and Angstrom exponent are analyzed using two-year Cimel sunphotometer data at Jinghe site locates in Xilan, China. By local pollution and topo- graphic effects, the aerosol optical thickness in Jinghe River is higher in the whole year. The annual mean AOD is 0.69±0.40 from May 2008 to April 2009 and 0. 67±0. 39 from April 2010 to March 2011. The maximum values of optical thickness and wavelength exponent occurred in summer. The effect of dust and sand weather, the aerosol wavelength exponent in spring is the lest, the optical thickness in the autumn is the lest. The comparsion between MODIS and CE318-derived AOD shows that the both have a better cor- relation, the data of accordance with the design precision of MODIS is 55.0%-73.3%. The spatial distri- bution of MODIS AOD average value in 2008 2010 show that there are 3 AOD high value areas in Shaanxi, which Located in the Guanzhong basin, Hanzhoung city and Ankang downtown. Local pollution and topographic effect is mainly reason of causing the high value zone of AOD.

关 键 词：气溶胶光学厚度 MODIS CE318 

分 类 号：P402[天文地球—大气物理学与大气环境]