Abstract

Moderate Resolution Imaging Spectroradiometer (MODIS) products were used in this study which covers a period of 2000 − 2014. Comparison of the SCA derived from MODIS and Landsat NDSI showed a significant correlation, the resultant coefficient of determination (R²) was 0.85. For analyzing the trend in the SCA, the Mann-Kendall test was applied; the results show an increasing non-significant trend in the mean annual SCA with a Sen’s slope value of +16.99 (km²/year), and a significant increasing trend in the winter SCA was identified. The annual mean SCA was 8.92 km² and 564 km² for elevation ranges of 5001 − 5694 m and 4001 − 4500 m respectively. The spatial extent of snow cover was maximum in 70^° − 78.3^° slope class and minimum in 30^° − 40^° slope class. The results highlight the MODIS snow cover products’ capability to assess the spatiotemporal dynamics of snow cover in complex mountainous watersheds.

摘要

本研究使用中分辨率成像光谱仪（MODIS）产品，涵盖2000-2014年。MODIS和Landsat NDSI得出的SCA的比较显示出显着的相关性，所得决定系数（R ²）为0.85。为了分析 SCA 中的趋势，应用了 Mann-Kendall 检验；结果表明，年平均 SCA 有增加的非显着趋势，Sen 的斜率为 +16.99 (km ² /year)，并且确定了冬季 SCA 有显着增加的趋势。海拔5001 - 5694 m和4001 - 4500 m的年平均SCA分别为8.92 km ²和564 km ²。积雪的空间范围在 70 ^° − 78.3 时最大^°坡度等级和最小值在 30 ^° − 40 ^°坡度等级。结果突出了 MODIS 积雪产品评估复杂山区流域积雪时空动态的能力。