Analysis on the sand-dust source in Mid-Eastern China based on the data of ground stations and RS

In order to understand the sand-dust source of Mideastern China and the change law of the west sand-dust influence the Mid-eastern China, we use the ground observation data:daily observation dust data of 753 weather stations in China during 26 years (1982 ~ 2007) and MODIS NDVI to get the sand-dust information of Mid-Eastern China and analysis the temporal-spatial distribution of the source sand-dust. Result show that, the exotic west sand-dust has important influence on the dust weather of Mid-Eastern China, the dust weather which is caused by the local dust is less. The spatial influence distribution of the west sand-dust on the Mid-Eastern China is weakened gradually from northwest to southeast. The local sandy land, bare dry land and bare silt of withered riverbed will aggravate the influence of exotic sand-dust on the local environment. During the 26 years, the influence is most seriously in 1980´s, and gradually weakened in 1990´s, and it is rally from 2000, but the total trend is weakened year by year. In spring and summer (March to June) the west sand-dust´s influence is most serious, and in autumn (September to October) is weakest, but the regularity of seasonal variation is slightly different in different areas.