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In this paper, using the 1980-2015 ECMWF reanalysis data, the MVC method was used to obtain the monthly snow depth. Combined with trend analysis, 5a moving average, abnormal year analysis and MK mutation test, we analyze the spatio-temporal characteristics of snow depth and it influencing factors in the Mongolian Plateau. The results showed that: (1) the snow depth of the Mongolian Plateau increased at 0.25 mm/a, particular after 2000, but there was no obvious mutation. And the minimum snow depth during the year occurred in October and reached the maximum in February of the following year. (2) Abnormal deep snow depth is mainly occurred in the 21st century, especially after 2009, indicating that it has been in snowy periods. (3) On the spatial distribution, the snow depth of the Mongolian Plateau increases from south to north and from  *通讯作者:萨楚拉(1977-),男,博士, 副教授,主要从事遥感与地理信息系统应 用研究。Email:sachulan@126.com。 west to east. (4) Snow depth in Mongolian Plateau is mainly affected by temperature and precipitation.

Spatial-temporal Distribution Characteristics of Snow Depth in Mongolian Plateau Based on Reanalysis Data