2000-2005年青藏高原积雪时空变化分析

利用MODIS卫星反演的积雪资料以及同期气象资料,分析了2000-2005年青藏高原积雪分布特征、年际变化及其与同期气温和降水的关系,结果表明:青藏高原积雪分布极不均匀,四周山区多雪,腹地少雪;高原积雪期主要集中在10月到翌年5月;2000-2005年高原积雪年际变化差异较大,积雪面积总体上呈现冬春季减少、夏秋季增加的趋势;气温和降水是影响高原积雪变化的基本因子.冬季,高原积雪面积变化对降水更为敏感;春季,气温是影响高原积雪面积变化更主要的因素.

Analysis of the Temporal and Spatial Variations of Snow Cover over the Tibetan Plateau Based on MODIS

A study is presented of the spatial distribution,seasonal and inter-annual variability of snow cover over the Tibetan Plateau from 2000 to 2005,and their relation to corresponding temperature and precipitation.The data used consist of MODIS 8-day snow cover extent chart and the daily temperature and precipitation data from meteorological stations.The distribution of the snow cover over the Tibetan Plateau is far from uniformity.In the peripheral high mountains snow cover distributes extensively and has a long duration,but in the vast interior it is rare or even thin.The duration of snow cover in the Tibetan Plateau is from October to May of the next year.Inter-annual change of snow cover is evident during 2000-2005.The Plateau snow cover extent slowly increases in summer and autumn,but decreases in winter and spring.Temperature and precipitation are the main factors affecting the change of snow cover in the Tibetan Plateau.In winter,precipitation has more significant effect on snow cover extent than temperature does.But in spring,temperature has more important impact on snow cover.