【作者】 陈林； 石广玉； 秦世广； 陈彬； 陈丽琼； 陈焕森；

【Author】 CHEN Lin~(1,2),SHI Guangyu~2,QIN Shiguang~3,CHEN Bin~2, CHEN Liqiong~2,and CHEN Huansen~2 1 Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,National Satellite Meteorology Center,China Meteorological Administration,Beijing 100081 2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 3 National Atmospheric Observation and Technology Center,China Meteorological Administration,Beijing 100081

【机构】 中国气象局国家卫星气象中心卫星幅射定标与真实性检验重点实验室； 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室； 中国气象局大气探测技术中心；

【摘要】 应用MODIS卫星的气溶胶产品资料和地面的光学粒子计数器的资料,对比分析了北京地区2006、2007、2008年7～9月的气溶胶光学厚度、细粒子光学厚度、Angstrom指数、气溶胶粒子数浓度谱及体积谱,发现2008年北京奥运会期间(7月20日～9月20日)的气溶胶光学厚度比2006、2007年同期明显降低,气溶胶细模态光学厚度占总光学厚度的比上升,Angstrom指数上升,气溶胶细粒子数浓度没有明显相对变化,而粗粒子数浓度则减少约50%。利用大气标高,将MODIS反演的气溶胶柱的质量浓度转化为地面气溶胶质量浓度。用粒子计数器得到的体积谱,在假定气溶胶粒子密度的情况下,计算出其质量浓度。将这两种方法得到的气溶胶质量浓度与国家环境保护部公布的空气质量指数换算得到的可吸入颗粒物(PM10)质量浓度进行比较。结果表明:北京奥运期间空气质量总体达到了国家二级空气质量标准;与2006、2007年同期相比,2008年气溶胶PM10质量浓度明显下降,而这主要是由气溶胶粗粒子的减少引起的。更多还原

【Abstract】 The aerosols optical depth(AOD),optical depth due to fine aerosol particles,Angstrom index,and number concentration and volume size distribution of aerosol particles during the Beijing Olympic Games(20 July to 20 September 2008) were compared with data in the same periods of 2006 and 2007 using the MODIS retrieved aerosols product and the data measured by the optical particle counter on the ground.Decrease in AOD during the Beijing Olympic Games was primarily attributed to the reduction in coarse mode aerosol particles.The Angstrom index and particle counter data also approved this.The MODIS retrieved aerosols mass was converted to the surface aerosol mass concentration by dividing by the atmospheric scale height in Beijing,while another aerosol mass concentration was gained by the particle volume size distribution assumed the density of aerosol particles.Comparison of these two concentrations with the particulate matter with aerodynamic diameter less than 10μm(PM10) concentration translated by air pollution index(API) showed that Beijing air quality in the 2008 Olympic Games was improved and achieved classⅡnational standard,which primarily owes to the reduction in coarse mode aerosol particles.更多还原