Snow Cover Variations and Controlling Factors at Upper Heihe River Basin, Northwestern China
Snow Cover Variations and Controlling Factors at Upper Heihe River Basin, Northwestern China
复制标题
DOI：
10.3390/rs70606741
复制
发表时间：
2015-06-01
期刊：
影响因子：
5
通讯作者：
Ke, Changqing
中科院分区：
文献类型：
--
作者：
Bi, Yunbo;Xie, Hongjie;Ke, Changqing
雪是一种重要的水资源，对下游地区的供水量有很大影响。利用灵活的多天组合MODIS积雪产品，分析了黑河上游流域2003-2013年（9 - 8月）水文年积雪变化特征。积雪的空间分布和格局相对稳定，积雪面积（SCA）和积雪日数的最大值出现在HY 2004年，HY 2008年和HY 2012年。提出了一种基于SCA与气候因子（主要是气温和降水）相关系数的方法，以确定决定气候因子对SCA贡献的阈值高度。UHRB的阈值海拔为3650 +/- 150 m，在此海拔以下，空气温度（T-空气）和降水都是SCA的负因素，除了在冬季，当两者都是积极的因素。在阈值高度以上，降水除夏季外均为正因子，而T空气除秋季外均为负因子。总的来说，T-空气是SCA的主要控制因素低于阈值高度，而降水是SCA的主要控制因素高于阈值高度。
Snow is an important water resource and greatly influences water availability in the downstream areas. In this study, snow cover variations of the Upper Heihe River Basin (UHRB) during hydrological years (HY) 2003-2013 (September through August) is examined using the flexible multiday-combined MODIS snow cover products. Spatial distribution and pattern of snow cover from year to year for the basin is found to be relatively stable, with maximum snow cover area (SCA) and snow cover days occurring in HY2004, HY2008 and HY2012. A method, based on correlation coefficients between SCA and climate factors (mainly air temperature and precipitation), is presented to identify the threshold altitude that determines contributions of climate factors to SCA. A threshold altitude of 3650 +/- 150 m is found for the UHRB, where below this altitude, both air temperature (T-air) and precipitation are negative factors on SCA, except in the winter season when both are positive factors. Above the threshold altitude, precipitation acts as a positive factor except in summer, while T-air is a negative factor except in autumn. Overall, T-air is the primary controlling factor on SCA below the threshold altitude, while precipitation is the primary controlling factor on SCA above the threshold altitude.