| 西北干旱区地气温差季节和年际变化特征的分析 |
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| 引用本文： | 符睿,韦志刚,文军,李振朝,卢广献.西北干旱区地气温差季节和年际变化特征的分析[J].高原气象,2008,27(4). |
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| 作者姓名： | 符睿 韦志刚 文军 李振朝 卢广献 |
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| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所西部气候环境与灾害重点实验室,甘肃,兰州730000;云南省气象科学研究所,云南,昆明650034;季风与气象灾害研究开放实验室,云南,昆明650034
2. 中国科学院,寒区旱区环境与工程研究所西部气候环境与灾害重点实验室,甘肃,兰州730000 |
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| 基金项目： | 中国科学院知识创新工程项目，国家自然科学基金，财政部/科技部公益类行业专项 |
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| 摘 要： | 利用西北干旱区49个气象站1961—2000年0 cm地温和气温月平均资料,采用逐级归并法、小波分析、经验正交函数(EOF)、旋转经验正交函数(REOF)方法,分析了西北干旱区地气温差的时空演变特征、气候突变和周期振荡。结果表明:西北干旱区地气温差可分为12月~2月、3月、4~6月、7~10月和11月5类,11月和12月~2月呈下降趋势,3月、4~6月和7~10月呈上升趋势,12月~2月下降幅度较大,4~6月上升幅度最大;地气温差受大尺度气候异常的影响,第一载荷向量反映了全区一致的性质;北疆区和内蒙区有异常变化存在;3月和11月的突变点为1977年,12月~2月、4~6月和7~10月的突变点为1981年;周期振荡主要以3~6年为主。
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| 关 键 词： | 西北干旱区 地气温差 季节和年际变化 |
Analyses on Characteristic of Seasonal and Interannual Variation of Difference between Surface and Air Temperature (Ts-Ta) in Arid Region in Northwest China |
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| FU Rui,WEI Zhi-gang,WEN Jun,LI Zhen-chao,LU Guang-xian.Analyses on Characteristic of Seasonal and Interannual Variation of Difference between Surface and Air Temperature (Ts-Ta) in Arid Region in Northwest China[J].Plateau Meteorology,2008,27(4). |
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| Authors: | FU Rui WEI Zhi-gang WEN Jun LI Zhen-chao LU Guang-xian |
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| Abstract: | The temporal-spatial evolution features,abrupt climate change and oscillatory period of the difference between land surface and air temperature(simply as the(Ts-Ta)) are analyzed by using the monthly surface temperature and air temperature of 49 weather stations(1961-2000) in the arid region in Northwest China(NWC),with hierarchical cluster analysis,wavelet analysis,EOF,REOF methods.The results show that(Ts-Ta) in the arid region in NWC can be divided into December~February,March,April~June,July~October and November;(Ts-Ta) reveals the tendency of descent in November and December~February.(Ts-Ta) reveals the tendency of ascent in March,April~June and July~October months;the tendency of descent is the maximum in December~February and the tendency of ascent is the biggest in April~June;(Ts-Ta) is influenced by the large-scale weather systems,the first loading vector reflects the main spatially-anomalous structure;the north of the Xinjiang and the Inner Mongolia area have the exceptionally change existence;the abrupt year in March and November months is in 1977;the abrupt year in December~February,April~June and July~October is in 1981;the periodic oscillation is mainly 3~6 years. |
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| Keywords: | The arid region in Northwest China (Ts-Ta) Seasonal and interannual variations |
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