伊犁河谷流域积雪分布及其变化分析

Analysis of snow cover distribution and its changes in the Hi River Valley

针对积雪分布变化的检测对区域冰雪资源的合理利用及灾害防治至关重要的问题,该文基于MODIS10A2积雪数据对研究区进行分带提取,采取趋势分析法、相关性分析法,分析不同海拔高度积雪年内年际变化特征以及分布变化原因。结果表明:积雪覆盖的垂直分布呈不同的季节性模式,其中高程C(2 200~3 200 m)是对积雪垂直分布影响最显著的区域;从各月积雪垂直分布和地表温度之间的回归分析来看,5和9月的相关性最为显著;12—2月(冬季)的相关性较差;积雪覆盖年际变化和地表温度的负相关性在高程A^D区比较显著;积雪日数长期变化在不同海拔有明显的差异,海拔≥2 000 m和≤1 000 m区域多年平均积雪日数呈减少趋势,海拔为1 200~1 800 m区域呈增加趋势。

Aiming at the problem that monitoring of the change of snow cover distribution was crucial for the utilization of regional ice and snow resources and the prevention of ice and snow disasters.in this paper,the collection of snow cover in the different altitude zones in the research area was carried out based on the MOD10A2 snow cover data,the annual and inter annual changes of snow cover distribution in different altitude zones and the factors afcting such changes factors were analyzed.The results showed that:the vertical distribution of snow cover showed different seasonal patterns,of which the elevation C(2200~3200 m)had the most significant areas on the vertical distribution of snow;from the regression analysis between the vertical distribution of snow and the LST of each month,the correlation between May and September was the most significant;the correlation between December February(winter)was poor;the negative correlation between snow and temperature in the elevation A^D area was significant;the long-term changes of snow cover days(SCD)had obvious differences at different altitudes.The average annual snow cover days in the areas with elevations of≥2000 m and≤1000 m showed a decreasing trend,and the altitude was 1200~1800 m.