论文

西安地区气溶胶光学特性研究

  • 董自鹏 ,
  • 李星敏 ,
  • 杜川利 ,
  • 张高健
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  • 陕西省气象科学研究所, 陕西 西安710014;泾河国家基准气候站, 陕西 西安710201

网络出版日期: 2013-06-28

Study on Aerosol Optical Property  in Xi′an  Region

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Online published: 2013-06-28

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MODIS AOD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。

本文引用格式

董自鹏 , 李星敏 , 杜川利 , 张高健 . 西安地区气溶胶光学特性研究[J]. 高原气象, 2013 , 32(3) : 856 -864 . DOI: 10.7522/j.issn.1000-0534.2012.00079

Abstract

The characteristics of Aerosol Optical Depth (AOD) and Angstrom exponent are analyzed using two-year  Cimel sunphotometer data at Jinghe site locates in Xi′an, China. By local pollution and topographic 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 correlation, the data of accordance with the design precision of MODIS  is  55.0%~73.3%. The spatial distribution 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.

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