沙尘气溶胶对西北地区植被遥感的影响分析  

Analyses of the Influence of Sand Dust Aerosol on Vegetation Remote Sensing in Northwest China

作　　者：张杰[1] 郭铌[1] 郝志毅[2] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]甘肃省气象局业务处,甘肃兰州730020

出　　处：《高原气象》2006年第1期116-122,共7页Plateau Meteorology

基　　金：国家自然科学基金项目(40375011);科技部项目(2000DIA10031)共同资助

摘　　要：选取扬沙—浮尘天气发生中、后的对地观测卫星EOS-MODIS数据,利用6S辐射传输模式对该卫星资料进行大气订正,分析了沙尘气溶胶对沙尘多发区的西北地区植被指数(VI)遥感的影响。结果表明,与晴空天气得到的反射率相比,沙尘使红光通道反射率ρ1、近红外通道反射率ρ2和蓝光通道反射率ρ3均增加,归一化植被指数NDVI有不同程度的降低,降低最大值为0.246。抗大气植被指数ARVI也有所降低,降低最大值为0.231。应用晴空天气条件下的资料,建立了西北干旱区ARVI与NDVI之间的线性关系,并证明了在沙尘天气条件下,利用ARVI计算NDVI的方法,所得的结果较好。Some representative MODIS data are picked up and atmosphere correction is done by using 6S model. The influence of sand dust aerosol on VI in Northwest China is analysed. The result showed that sand dust aerosol is of some radiation characteristic, which lead to reflectivity ρ1, ρ2, ρ3 increased, and the values of NDVI and ARVI are decreased if the atmosthere correction is did. The value of NDVI is minished by influencing of sand dust, and the maximum value is 0. 246, the value of ARVI is minished by influencing of sand dust, and the maximum value is 0. 231. By using the some data in clear sky, a linearity relation between ARVI and NDVI is established, this relation is used well in sandy day.

关 键 词：西北地区 沙尘气溶胶 植被指数 6S辐射传输模式 大气订正 

分 类 号：P445.4[天文地球—大气科学及气象学]