| 西藏东部山区积雪高程的年内变化特征及其量化 |
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| 引用本文： | 高洁,傅旭东,巩同梁,王光谦,王远见,王皓.西藏东部山区积雪高程的年内变化特征及其量化[J].冰川冻土,2011,33(2):246-253. |
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| 作者姓名： | 高洁 傅旭东 巩同梁 王光谦 王远见 王皓 |
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| 作者单位： | 清华大学水沙科学与水利水电工程国家重点实验室,北京,100084;清华大学水沙科学与水利水电工程国家重点实验室,北京,100084;西藏自治区水利厅,西藏,拉萨,850000 |
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| 基金项目： | 科技部十一五科技支撑计划项目(2007BAC06B06)资助 |
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| 摘 要： | 引入变动积雪覆盖高程(FSCE)描述积雪/裸地下垫面分界线在多年平均意义下的年内变化特征,通过参数无雪期中期Tm和无雪期持续时间ΔT对其进行量化,建立了藏东拉萨河流域、尼洋河流域和昌都地区的FSCE回归模型.统计分析表明,在25km×25km雪产品栅格分辨率下,研究区域内近80%的面积上,积雪的时空分布可以通过FSCE刻画:1)无雪期中期Tm的多年平均值为一年的7月31日,与地理地形因素相关性较弱;2)无雪期持续时间ΔT的多年平均值约为5个月(151d),与栅格平均高程显著负相关;3)一年的4月下旬积雪开始消融、6月下旬至9月中旬为无雪期,11月中旬至次年3月为积雪覆盖期.将来更高空间分辨率的雪产品数据,将有助于揭示小尺度上的FSCE精细特征.
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| 关 键 词： | 变动积雪覆盖高程(FSCE) 藏东 无雪期中期 无雪期持续时间 回归 |
Characterization and Quantification of Within-year Variation of Snow-Cover Elevation in Mountainous Regions, Eastern Tibet |
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| GAO Jie,FU Xu-dong,GONG Tong-liang,WANG Guang-qian,WANG Yuan-jian,WANG Hao.Characterization and Quantification of Within-year Variation of Snow-Cover Elevation in Mountainous Regions, Eastern Tibet[J].Journal of Glaciology and Geocryology,2011,33(2):246-253. |
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| Authors: | GAO Jie FU Xu-dong GONG Tong-liang WANG Guang-qian WANG Yuan-jian WANG Hao |
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| Institution: | GAO Jie1,FU Xu-dong1,GONG Tong-liang1,2,WANG Guang-qian1,WANG Yuan-jian1,WANG Hao1 (1.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China,2.Tibet Bureau of Water Resources,Lhasa Tibet 850000,China) |
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| Abstract: | Fluctuating snow-covered elevation(FSCE) was conceptualized and proposed to characterize within-year variation of the border between snow-covered area and snow-free area in mountainous regions.Two parameters,namely median of the snow-free period(Tm) and duration of snow-free period(DT),were defined to quantify FSCE.A regression model of FSCE was developed for the Lhasa River basin,Niyang River basin and Changdu Prefecture in Eastern Tibet.Statistical analyses of the snow-products data with a spatial resolut... |
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| Keywords: | fluctuating snow-covered elevation eastern Tibet median of the snow-free period duration of snow-free period regression |
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