1981-2010年青藏高原降雪日数时空变化特征

利用青藏高原气象站降雪日数观测资料,分析1981—2010年青藏高原降雪日数的时空变化特点和主要影响因素。结果表明:降雪日数总体上呈青藏高原中东部高寒地区、喜马拉雅山脉南麓和祁连山脉流域降雪日数多,南部河谷和北部湖盆区降雪日数少的空间分布格局;春季降雪日数占全年的45%,其次是冬季(28%)和秋季(22%),夏季最少(5%);30年内青藏高原平均年降雪日数呈明显减少趋势,降幅达10.5 d/(10 a),其中,春季降幅最大(4.8 d/(10 a)),夏季最小(1.2 d/(10 a));年降雪日数在1997年发生了由多到少的气候突变;降雪日数年内分布呈双峰型,峰值出现在冬夏大气环流的转换季节...

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Published in应用气象学报 Vol. 28; no. 3; pp. 292 - 305
Main Author 除多 洛桑曲珍 杨志刚 杨勇
Format Journal Article
LanguageChinese
Published 中国气象局成都高原气象研究所拉萨分部,拉萨850000 2017
西藏高原大气环境科学研究所,拉萨850000%西藏高原大气环境科学研究所,拉萨,850000%西藏自治区气候中心,拉萨,850000
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ISSN1001-7313
DOI10.11898/1001-7313.20170304

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Summary:利用青藏高原气象站降雪日数观测资料,分析1981—2010年青藏高原降雪日数的时空变化特点和主要影响因素。结果表明:降雪日数总体上呈青藏高原中东部高寒地区、喜马拉雅山脉南麓和祁连山脉流域降雪日数多,南部河谷和北部湖盆区降雪日数少的空间分布格局;春季降雪日数占全年的45%,其次是冬季(28%)和秋季(22%),夏季最少(5%);30年内青藏高原平均年降雪日数呈明显减少趋势,降幅达10.5 d/(10 a),其中,春季降幅最大(4.8 d/(10 a)),夏季最小(1.2 d/(10 a));年降雪日数在1997年发生了由多到少的气候突变;降雪日数年内分布呈双峰型,峰值出现在冬夏大气环流的转换季节,青藏高原大气环流的转换期与上升运动相联系的低值天气系统和高空温湿条件均有利于降雪出现;青藏高原降雪日数的明显减少与气温的显著上升呈线性关系。
Bibliography:11-2690/P
snowfall days; spatio-temporal variation; ground observation; the Tibetan Plateau
Chu Duo1),2) Luosang Quzhen2) Yang Zhigang2) Yang Yong3( 1) (Lhasa Campus of Institute of Plateau Meteorology, CMA, Lhasa 850000) 2) (Tibet Institute of Plateau Atmospheric and Environmental Sciences, Lhasa 850000) 3) Tibet Climate Center, Lhasa 850000
Snow is a vital component of alpine regions due to its large seasonal variations and distinctive physical properties, it greatly affects climate, hydrology, and ecology at regional and global scales. The Tibetan Plateau (TP), also called "the roof of the world", is the highest land and typical alpine region on the earth with over 4000 m above sea level. Snow on the TP is a vital fresh water source in the Himalayan region and downstream areas, and also a significant indicator of climate change from regional to global scales. There- fore, under global climate warming, the variation of snowfall days over the TP, which is defined as the number of days with snowfall (including s
ISSN:1001-7313
DOI:10.11898/1001-7313.20170304