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Characterization and quantification of within-year variation of snow-cover elevation in mountainous regions, eastern Tibet

ISSN号：1673-9264
期刊名称：《中国防汛抗旱》
时间：0
分类：TP751[自动化与计算机技术—控制科学与工程;自动化与计算机技术—检测技术与自动化装置] Q958.575[生物学—动物学]
作者机构：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China, [2]Tibet Bureau of Water Resources, Lhasa 850000, China, [3]Hydropower and Water Resources Planning ＆ Design General Institute, Beijing 100120, China
相关基金：Acknowledgments： This work was supported by the National Natural Science Foundation of China under Grant No. 50221903 and by the Ministry of Science and Technology of China under Grant No. 2007BAC06B06. The ＂Long-term snow depth dataset of China （1978-2005）＂ is provided by ＂Environment ＆ Ecological Science Data Center for West China, National Natural Science Foundation of China＂（http：//westdc.westgis.ac.cn）. We would like to specially thank Dr. Che T from Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, for his great help.

作者： Jie Gao[1,3], XuDong Fu[1], TongLiang Gong[1,2], GuangQian Wang[1], Hao Wang[1]

关键词：西藏东部, 海拔, 积雪, 山区, 量化, 尼洋河流域, 空间分辨率, 表征, fluctuating snow-covered elevation （FSCE）, eastem Tibet, median of snow-flee period, duration of snow-flee period

中文摘要：

波动的盖住雪的举起( FSCE )是 conceptualized 并且建议在多山的 regions.Two 参数描绘在盖住雪、没有雪的区域之间的边阶的在内年变化，免费时期( Tm )和雪释放的雪也就是中部持续时间(在)，被定义确定 FSCE 的 FSCE.A 回归模型与 25km 的空间分辨率在雪产品数据的东方 Tibet.Statistical 分析为拉萨河盆， Niyang 河盆，和 Changdu 区域被开发?畢?桴??

英文摘要：

Fluctuating snow-covered elevation （FSCE） was conceptualized and proposed to characterize within-year variation of the border between snow-covered and snow-free area in mountainous regions. Two parameters, namely median of snow flee period （Tm） and snow free duration （AT）, were defined to quantify FSCE. A regression model of FSCE was developed for the Lhasa River Basin, Niyang River Basin, and Changdu region in eastern Tibet. Statistical analysis of the snow-products data with a spatial resolution of 25km×25km shows that：（1） Tm correlates weakly with geographical and topographic factors, having the yearly mean value of July 31; （2） △T correlates significantly with the average elevation of the snow-products cell, having the yearly mean value of nearly five months （i.e., 151 days）; （3） the region begins snow disappearance in late April and finishes snow coverage in mid November, being snow-free from late June to mid September and snow-covered from December to March in the next year. In addi- tion, snow-products with higher spatial resolution will be helpful to characterize FSCE in smaller spatial scales.

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