基于MODIS数据的西南地区气溶胶光学厚度时空变化特征分析  

An MODIS-Based Analysis of Spatio-Temporal Variations of Aerosol Optical Depth in Southwest of China

作　　者：刘灿[1,2] 高阳华 易静 杨世琦 倪波顺[1,2] 程敏[1,2] 

机构地区：[1]重庆师范大学地理与旅游学院,重庆400047 [2]重庆市气象科学研究所,重庆401147

出　　处：《西南大学学报（自然科学版）》2014年第5期182-189,共8页Journal of Southwest University(Natural Science Edition)

基　　金：国家科技部农转资金项目(2013GB24160637);国家自然科学基金项目(40975058);重庆市应用开发计划重点项目(CSTC2013YYKFB0202);重庆市工程技术研究中心建设项目(CSTC2011PT-GC80023);中国气象局气象关键技术集成与应用面上项目(CMAGJ2013M41);重庆市科委基础与前沿研究计划项目(CSTC2013JCYJA20010)

摘　　要：研究气溶胶光学厚度时空变化特征,对于了解气溶胶的时空分布规律及其气候效应具有重要意义.本文利用2000-2012年MODIS Level3大气气溶胶光学厚度数据,结合GIS空间分析和制图功能,对西南地区大气气溶胶光学厚度的时空变化特征进行了分析,结果表明：2000-2012年西南地区平均AOD值在0.25~0.31之间波动变化,其中四川盆地地区AOD值比云贵高原地区要高,整个研究区平均AOD呈下降趋势,但趋势并不显著（p〉0.05）;西南地区四季平均AOD值有所差异,AOD值从高到低依次为：春季、夏季、冬季、秋季,除冬季AOD呈上升趋势外,其他三季均呈下降趋势;从空间分布上看,四川盆地中部常年为AOD高值中心,四川盆地边缘和云贵高原地区AOD均相对较低;西南地区AOD变化趋势空间差异明显,四川盆地西部为AOD主要减少区,四川盆地中部为AOD主要增加区,云贵高原地区AOD整体比较稳定.Based on the monthly data of MODIS Level 3in 2000-2012and applying the functions of spatial analysis and mapping of GIS,this paper analyzes the spatio-temporal variabilities of aerosol optical depth（AOD）in the southwestern region of China.The annual mean AOD varied between 0.25and 0.31in this region in the 13years from 2000to 2012.The annual AOD was higher in Sichuan Basin than on YunnanGuizhou Plateau.In the region as a whole,mean AOD showed a decreasing trend,which was non-significant statistically,though.Spring had the highest seasonal mean AOD,followed in order by summer,winter and autumn.Moreover,a decreasing trend was found in spring,summer and autumn,while winter showed an ascendant trend in mean AOD.Spatially,significant differences in AOD existed in this region. The central part of Sichuan Basin had the highest AOD value throughout the year,while the AOD value in the border areas of the basin and on Yunnan-Guizhou Plateau was relatively low.In the 13years,significant spatial differences were detected in the change trend of AOD,and the increasing area was located in the central part of Sichuan Basin,while the decreasing area was located in its western part,and the AOD was comparably stable on Yunnan-Guizhou Plateau.

关 键 词：MODIS 气溶胶光学厚度 西南地区 时空变化 

分 类 号：X513[环境科学与工程—环境工程]