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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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近50年青藏高原东部冬季积雪的时空变化特征
DOI: 10.11821/dlxb201311005, PP. 1493-1503
Keywords: 空间分布,青藏高原,年代际变化,冬季积雪
Abstract:
选取青藏高原东部地区1961-2010年64个测站的积雪数据，分析了冬季积雪日数的空间分布和年代际变化特征，结果表明高原东部冬季积雪空间分布差异较大，巴颜喀拉山、唐古拉山和念青唐古拉山多雪且变率大，藏南谷地、川西干暖河谷地带及柴达木盆地少雪且变率小，这样的空间分布是由周边大气环流系统及复杂局地地形共同造成的；高原东部冬季积雪表现出“少—多—少”的年代际变化特征，分别在80年代末和20世纪末发生由少到多和由多到少的两次突变，尤其是20世纪末的突变更为显著；降雪和气温的变化是影响积雪日数的重要因素，其中降雪的影响更为显著；80年代末高原冬季降雪由少到多的突变是造成积雪日数发生相应变化的主要原因；20世纪末高原冬季气温和降雪分别发生由低到高和由多到少突变，其影响叠加导致积雪日数发生了更为显著的突变。
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