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投稿时间：2013-01-04 修订日期：2013-04-25
投稿时间：2013-01-04 修订日期：2013-04-25
中文摘要: 基于江淮流域逐月日照时数观测资料，利用旋转正交函数（REOF）、线性趋势分析、Mann Kendall突变检验以及Morlet小波分析等方法，对江淮流域夏半年（5—10月）日照时数进行了统计分析，结果表明：江淮流域夏半年日照时数普遍在1000~1200 h之间，呈现由南向北递增的空间分布特点，但受地形等因素影响又存在区域性差异。同时发现其标准差与平均日照时数呈现并不一致的分布规律。进一步将江淮流域日照时数分为4个区，分别为北部区Ⅰ、东北区Ⅱ、西南区Ⅲ和东南区Ⅳ，每个区都表现出显著的下降趋势，但在线性趋势、突变时段以及周期特征上，各个区域又存在显著的差异。
中文关键词: 江淮流域， 夏半年， 日照时数， 气候特征， 变化趋势
Abstract:Based on the monthly observational data of sunshine hours, using Rotated Empirical Orthogonal Function (REOF), linear trend analysis, Mann Kendall mutation test and Morlet wavelet analysis, the climate characteristics and trend of sunshine hours over the Yangtze Huaihe Basin in summer half year (May to October) were statistically analyzed. Results show that sunshine hours over this area in summer half year were 1000 to 1200 h overall, increasing from the south to the north of spatial distribution characteristics. However, regional differences existed for the factors of topography. The standard deviation and average sunshine hours do not present the same distribution. The sunshine hours in Yangtze Huaihe Basin are divided into four areas furthermore, north area respectively Ⅰ, northeast area Ⅱ, southwest area Ⅲ, southeast area Ⅳ, sunshine hours of each area declined significantly, but remarkable differences exist in linear trend, mutation, time and variation period.
keywords: Yangtze Huaihe Basin, summer half year, sunshine hours, climate characteristic, change trend
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基金项目:公益性行业（气象）科研专项（GYHY201306035）和国家重点基础研究发展规划项目（2012CB955204）共同资助
| 作者 | 单位 |
| 曹琦萍 | 南京大学大气科学学院，南京 210093 安徽省公共气象服务中心，合肥 230061 |
| 王传辉 | 安徽省公共气象服务中心，合肥 230061 |
| 周建平 | 安徽省公共气象服务中心，合肥 230061 |
| 罗艳 | 安徽省公共气象服务中心，合肥 230061 |
引用文本：
曹琦萍,王传辉,周建平,罗艳,2014.江淮流域夏半年日照时数气候特征及趋势分析[J].气象,40(5):549-554.
CAO Qiping,WANG Chuanhui,ZHOU Jianping,LUO Yan,2014.Climate Characteristics and Trend Analysis of Sunshine Hours in Summer Half Year over the Yangtze Huaihe Basin[J].Meteor Mon,40(5):549-554.
曹琦萍,王传辉,周建平,罗艳,2014.江淮流域夏半年日照时数气候特征及趋势分析[J].气象,40(5):549-554.
CAO Qiping,WANG Chuanhui,ZHOU Jianping,LUO Yan,2014.Climate Characteristics and Trend Analysis of Sunshine Hours in Summer Half Year over the Yangtze Huaihe Basin[J].Meteor Mon,40(5):549-554.