基于MODIS的华东地区气溶胶光学厚度时空变化特征分析

Analysis on Spatial and Temporal Variation Characteristics of Aerosol Thickness in East China Based on MODIS

选用2001年1月-2015年12月MODIS数据,运用线性趋势等方法研究华东地区气溶胶光学厚度(AOD)的变化特征及影响因素。结果表明,2001-2015年华东地区AOD平均值变化范围在0.4~0.7之间,且呈现递减趋势。山东省西部、安徽省北部及江苏省AOD相对较高;福建省、浙江省南部及江西省南部地区AOD较低。华东地区气溶胶最低值出现在12月,最高值出现在6月;虽然冬季AOD变化趋势增长较高,但最高值仍出现在夏季。AOD主要受地形、NDVI、风速及人类活动等因素的影响,地形、NDVI、风速均与AOD呈负相关。

In this paper,the MODIS data from January 2001 to December 2015 were used to study the variation characteristics and the influencing factors of aerosol optical depth(AOD)in East China.The results showed that the average AOD value in East China were between 0.4 and 0.7 from 2001 to 2015,appearing a decreasing trend.The AOD in western Shandong Province,northern Anhui and Jiangsu Province were relatively high.The AOD in Fujian Province,southern Zhejiang Province and southern Jiangxi Province were low.The minimum in Eastern China appeared in December,and the maximum appeared in June.The peak value of AOD appeared in summer,though it increased greatly in winter.AOD was mainly affected by terrain,NDVI,wind speed and human activities,it was negatively correlated with terrain,NDVI or wind speed.