湘西自治州日照气候特征及影响因素分析

应用线性分析,小波分析、M-K突变检验等方法对湘西自治州1960-2013年各县（市）日照时数地域分布特征、年变化特征进行分析。结果表明：湘西自治州近54a年均日照时数总体呈减少趋势,但只有个别站表现较为明显。年日照时数从地域分布来看,总体东南多西北少,但在不同的月份有不同的特征,与省内同纬度台站比较,湘西自治州各地日照时数在冬半年偏少明显;各县（市）年日照时数存在较为明显准2a、准5a、准16a、准28a时间特征尺度;M-k突变检验,总体平均值在1970s后期存在一次明显的突变,但个别县（市）部分站突变不明显;湘西自治州日照时数各季节的变化与控制本地天气系统的季节变化有较好的相关性。

Climate characteristics and influence factors analysis of sunlight in Xiangxi Autonomous Prefecture

Based on the linear analysis, wavelet analysis and the M- K mutation testing method, regional distribution and annual variation characteristics of sunshine hours from 1960 to 2013 in Xiangxi Autonomous Prefecture are analyzed. Overall, results show that the annual average sunshine hours of decrease in recent 54 years showed a trend, but only a few stand performances are more obvious. From the regional distribution of Annual sunshine hours, the hours in southeast is more than that in northwest,but there is different characteristics in different months. Compared with the same latitude stations in the province, sunshine hours of the Xiangxi Autonomous Prefecture in the winter half year is obviously less;there are evident time scale of sunshine hours in every counties（cities）, like ： quasi 2 a, 5 a, 16 a,quasi 28 features; M-k mutation test, there is an obvious mutation of overall average in the late 1970 s,while in part of individual counties（city） the mutation is not obvious; change of sunshine hours in each season has good correlation with seasonal change of local weather control system.