| 天气与气候 |
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| Climatic Characteristics of Extreme Drought Period from May to September in Northwest China |
| WANG Jin-song1, WEI Feng1,2 |
| 1.Lanzhou Institute of Arid Meteorology, China Meteorological Administration; Key Open Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province and China Meteorological Administration, Lanzhou 730020, China; 2.Dingxi Meteorological Bureau, Dingxi743000, Gansu, China |
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Abstract Using the daily precipitation data（1960—2004）of 107 meteorological stations, and the methods of EOF, REOF and wavelet analysis, we analyzed the basic temporal-spatial distributions of extreme drought period and its cycles and abrupt time in Northwest China. The results show that there are close relationships between average distribution of extreme drought period and altitude, geographical location. The first load vector of extreme drought period variations has the characteristic of spatial consistency, and the second has adverse variation trend in east and west part. The rotated load vectors reflect 5 anomaly climatic areas of extreme drought period: northeast of Tibet Plateau, southern Xinjiang, Qinghai, northern Xinjiang and southeast of Northwest China. There is obvious 2~3 years high frequency cycle of extreme drought period in the 5 areas, 16 a and 8~11 a low frequency cycle in southeast of Northwest China and the other 4 areas, respectively. The extreme drought period has been shorting in Xinjiang and Tibet Plateau since 1980s. The distribution of extreme drought period has two abrupt points in northeast of Tibet Plateau, Qinghai and northern Xinjiang, whereas one abrupt point in southern Xinjiang and southeast of Northwest China.
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Received: 07 December 2005
Published: 20 May 2007
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[1]青藏高原气候图集会战组.青藏高原气象学.第五章:降水[M].北京:科学出版社,1979:49-61.
[2]钱正安,吴统文,宋敏江,等.干旱灾害和我国西北干旱气候的研究进展及回顾[J].地球科学进展,2001,16（1）：28-38.
[3]王新平,张景光,李新荣,等.沙坡头地区多年降水分布特征、趋势及其变率[J].中国沙漠,2001,21（4）:260-264.
[4]南庆红,杨舵,杨青.应用EOF方法分析新疆降水变化特征[J].中国沙漠,2003,23（5）:554-559.
[5]杨建平,丁永建,陈仁升.长江黄河源区水文和气象序列周期变化分析[J].中国沙漠,2005,25（3）:351-355.
[6]王永兴.吐鲁番盆地气候变化及其对水资源的可能影响[J].中国沙漠,2000,20（2）:208-211.
[7]马晓波,胡泽勇.青藏高原40年来降水变化趋势及突变的分析[J].中国沙漠, 2005,25(1):137-139.
[8]汤懋苍,江灏,柳艳香.全球各类旱区的成因分析[J].中国沙漠, 2002,22(1):1-5.
[9]屈建军,马立鹏,刘从.甘肃省沙漠化现状、成因及其防治对策[J].中国沙漠,2002,22(5):520-524.
[10]吴洪宝,李栋梁,章基嘉.中国冬季月平均气温异常的旋转EOF分析[J].南京气象学院学报,1995,18（3）：349-354.
[11]李跃清.相空间EOF方法极其在气候诊断中的应用[J].高原气象,2001,20（1）：88-93.
[12]林振山,邓自旺.子波气候诊断技术的研究[M].北京：气象出版社,1999：1-38.
[13]North J R,Bell T,Cahalan R,et al.Sampling errors in the estimation of empirical orthogonal function[J].Mon Wea Rev,1982,110:699-706.
[14]施雅风,沈永平,李栋梁,等.中国西北气候由暖干向暖湿转型的特征和趋势探讨[J].第四纪研究,2003,23(2)：152-164. |
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2007, Vol. 27 
