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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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1981-2010年西藏霜冻日数的变化特征
DOI: 10.11821/dlxb201405012, PP. 690-696
Keywords: 年际和年代际变化,突变,西藏,霜冻日数,异常
Abstract:
利用西藏38个气象站点1981-2010年的逐日最低气温资料，采用气候倾向率、累积距平、信噪比和R/S分析等气候统计方法，分析了霜冻日数的年际、年代际、异常、突变等气候变化特征。结果表明西藏霜冻日数都表现为不同程度的减少趋势，减幅为3.3~14.6d/10a（37个站P<0.01）；随着海拔高度的升高，霜冻日数减幅在增大。在10a年际变化尺度上，大部分站点霜冻日数20世纪80年代为正距平、21世纪初为负距平；90年代霜冻日数以正距平居多。有8个站点霜冻日数存在突变点，发生在20世纪90年代，以1997年居多。特多霜冻日数发生频数为0~3次，多发生在20世纪80年代；特少霜冻日数频数介于0~4次，以21世纪初居多。特多霜冻日数发生频次与经度、纬度和海拔高度的关系不密切，而特少霜冻日数发生频次与海拔高度呈极显著的负相关。
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