福建一次强冰雹天气的物理量及雷达回波特征分析

利用MODIS积雪资料以及同期气象资料,分析了2000-2009年玛纳斯河流域积雪面积年内、年际变化及其与同期气温和降水的关系,结果表明:玛纳斯河流域积雪面积在4个不同分带上随季节变化各不相同,其中,带1变化最剧烈,受气候影响最为显著;带2、带3积雪的增加和减少都比较平缓;带4受气候影响最小.从年际波动来看,带1积雪面积随季节变化更为明显,带4在四季变化中均较平稳.对整个流域积雪面积与气候资料的相关分析表明:冬季,流域积雪变化对降水更敏感;而春季,气温是影响流域积雪面积变化的更主要的因素.

Variation Characteristics of Snow Cover and Their Relation to Air Temperature and Precipitation in Manas River Basin

This paper analysed the spatial distribution, seasonal and inter-annual variability of snow cover over the Manas River basin from 2000 to 2009, and their relation to corresponding temperature and precipitation by using snow cover data from MODIS and the corresponding meteorological data. The results indicate that:the snow cover of four zones in Manas River Basin is various along with seasonal alternation; Snow cover of zone 1 change the most intensely and get the most obvious influence by climate change among four zones; both zone 2 and zone 3 are mild over the increase and decrease of snow cover ; zone 4 gets the least influence from climate change. Seen from inter-annual fluctuation, the snow cover change of zone 1 is more obvious than others with seasonal alternation and zone 4 seasonally change little . On the basis of correlation analysis between snow cover and climate data over the whole basin, the results indicate that contrary to temperature in spring, precipitation has more significant effect on snow cover in winter.