内蒙古中东部沙尘源解析

Analysis on Underlying Surface of Dust Emission Regions in Middle and Eastern Inner Mongolia

利用MODIS 1、4、3波段彩色合成影像结合31、32波段亮度温度差进行沙尘识别和信息提取,并通过叠置分析对内蒙古中东部沙尘源下垫面进行了判识。研究发现内蒙古中东部沙尘源区主要为草原区农用地和自然植被的镶嵌区、稀疏植被和灌丛区;同时干涸的湖泊也是重要的沙尘点源;由此可以推断在内蒙古中东部,人类活动对于沙尘的暴发负有重要责任。

Combination of color mosaic images （ band 1,4 and 3 ） and brightness temperature difference （ band 31- band 32） was used to discriminate and extract dust information from MODIS L1 B data that captured dust events over middle and eastern Inner Mongolia. Underlying surfaces of dust emission regions in the study area include farmland/natural vegetation, sparse vegetation and shrub and some dry lakes. Dust sources determined in this study showed that human activity contributes to aeolian erosion in middle and eastern Inner Mongolia.