摘要
应用北京城区2001-2007年间的MODIS气溶胶产品及辅助气象数据,分析了北京气溶胶类型特性及其变化趋势,以及风速、降水与气温等气候条件对其的影响。根据AOT550-FM关系模型,将北京气溶胶分成城市/工业型(UI),沙尘型(DD),干净海洋型(CM)和混合型(MT)4种类型,并在此基础上,结合辅助气象数据,分析了气候对总体气溶胶和各类型气溶胶的影响。研究表明,受风向、气温、降水等气候因素影响,北京气溶胶在5月取得最大值,北京气溶胶的主要类型为沙尘型气溶胶(DD)和混合型气溶胶(UI),而主要影响气溶胶为沙尘型气溶胶(DD)和城市/工业型气溶胶(UI)。在2001-2007年间,城市/工业型气溶胶(UI)有较明显的增长,沙尘型气溶胶(DD)则呈现为与地面统计数据相符的下降趋势,总体气溶胶和其他类型气溶胶都处于基本稳定状态,北京大气环境基本稳定。
Through a contrastive analysis between aerosol production （ MODO4_L2 ） of the Moderate Resolution Ima- ging Spectroradiometer （MODIS） and measured surface aerosol data, we verified the feasibility of using MODIS aerosol production（MODOg_L2） in analysis of aerosol spatial- temporal distribution. Then,using two data sets of the MODIS aerosol production from 2001 to 2007, i. e. the optical thickness at 550nm（ AOT550 ） and the ratio of optical depth of small mode versus effective optical depth （FM） , with help of auxiliary climate data, aerosol char- acteristics,mechanism of aerosol change, and affections of wind speed, precipitation and temperature on aerosol were analyzed. Based on the model between AOT550 and FM, this paper discriminates the aerosol to four types： urban/industrial （ hereafter UI）, clean maritime （CM）, desert dust （I）D）, and mixed types （ MT）, and analyzed the effects of wind speed, precipitation and temperature to total aerosol and different aerosol types. Results showed that, （ 1 ） effected by climate factors such as wind direction, temperature and precipitation, the AOT got the maximal value in May and the minimal value in November; （2）main AOT types of Beijing were desert dust aerosol（DD） and mixed types aerosol （MT） ; （3）main influencing AOT types of Beijing were desert dust aerosol（DD） and ur- ban/industrial aerosol（UI）. From 2001 to 2007 ,urban/industrial aerosol（UI） had an obvious increased affection caused by rapid increase of cars in Beijing. Desert dust aerosol （DD） had a downtrend matched with statistic data, whereas total aerosol and other two aerosol types were keeping steady. On the whole, the atmosphere environment of Beijing was keeping stable.
出处
《地球信息科学》
CSCD
北大核心
2009年第4期541-548,共8页
Geo-information Science
基金
国家重点基础研究发展计划项目(2007CB714406)
