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青藏高原积雪深度时空分布与地形的关系

DOI: 10.6046/gtzyyg.2015.04.26, PP. 171-178

Keywords: 青藏高原,被动微波遥感,Mann-Kendall检验,地形因子

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Abstract:

利用1979—2010年逐日中国雪深长时间序列数据集,采用GIS空间分析和Mann-Kendall检验等方法,分析了青藏高原雪深时空分布及其与地形的关系。结果表明:青藏高原雪深分布受地形影响明显,在5—9月平均雪深主要受到高程影响,在其他月份则受气温和高程共同影响;同一高程带雪深的变幅反映坡度和坡向对雪深的影响,变幅越宽坡向影响越大;最大雪深随高程和坡度的增加而增加,空间变异随高程的增加而下降,随坡度的增加而呈上升趋势;从10月至翌年5月,平均雪深在高程82~2482m和6082~7682m受坡度和坡向影响较高程2482~6082m要偏大;回归分析表明,高原雪深分布受到高程和坡度的双重影响,高程是雪深分布的主要影响因子,在高程82~3282m区间,坡度的空间差异对平均雪深空间变异的影响具有明显正效应。

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