| 摘要: |
| 利用湖南省86个测站1960～2005年降水资料,采用REOF、小波分析和M-K突变分析等方法,对湖南省年降水的空间分布特征和时间变化规律进行了分析。研究表明:湖南省年降水的空间分布既有全区一致性,也存在着南部与北部、湘中地区与周围地区及东北与西南相反变化的差异。湖南省降水的空间分异类型可分为湘南、湘西北、湘东北、湘中、湘西和湘西南6个区。46年来,湖南省降水除湘西北外,年降水有增加的趋势;在1990年代以后存在一个降水转变期,并且存在4年、7年、10～12年和24年左右的周期变化。除湘西北以外,各区降水无论是21年左右周期转变还是7～10年左右周期转变,在2000年代中后期降水还将相对偏少,之后可能进入一个多雨期。 |
| 关键词: 湖南省 年降水 REOF 小波分析 M-K突变分析 |
| DOI： |
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| 基金项目:湖南省重点学科建设项目;国家自然科学基金项目(批准号:40741002)共同资助 |
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| CLIMATOLOGICAL FEATURES OF ANNUAL PRECIPITATION IN HU'NAN PROVINCE DURING 46A |
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ZHANG Jian-ming1, ZHANG Xin-ping1, LI Zu-xian2, ZHANG Jian1
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1.College of Resources and Environment Sciences, Hu'nan Normal University, Changsha 410081, China;2.Hu'nan Meteorological Observatory, Changsha 410007, China
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| Abstract: |
| Using 1960～2005 annual precipitation data over 86 stations of Hu'nan Province,temporal and spatial variability features are studied by applying the methods of REOF,wavelet analysis and M-K methods. The result indicates: (1) The most typical pattern of annual precipitation is the dry-wet consistency. Other typical patterns show the dry-wet difference. For example,it is wet(or dry)in the north and dry(or wet)in the south,wet(or dry)in the center and dry(or wet) in the surrounding area,wet(or dry)in the northeast and dry(or wet)in the southwest. (2) The annual precipitation distribution exhibits common features as well as spatial differences,which can be classified into six types as Southeast Hu'nan,Northwest Hu'nan,North Hu'nan,central part of Hu'nan,West Hu'nan,and Southwest Hu'nan. (3) There is an wetter trend over Hu'nan Province in the past 46 years. Generally,annual precipitation presents an upward tendency and the periods of 4a,7a,10～12a and 24a. The abrupt change occurred about in the 1990s. |
| Key words: Hu'nan Province Annual precipitation REOF Wavelet analysis abrupt change analysis |
