小二沟地区53年日照时数气候特征分析

摘要

In this paper, the Xiaoer gully region nearly 53a sunshine time of observation data, analysis of Xiaoer gully region sunshine time interdecadal and interannual, each season, cloud cover change analysis, and USES the method of accumulative anomaly, linear tendency estimate, and SNR mutation test were analyzed. Xiaoer gully region (1957-2010),annual sunshine hours, sunshine percentage and sunshine duration each season there are varying degrees of reducing trend of annual sunshine duration lapse rate of about 12.1 h/10 a,and this degressive trend was on the rise. The most obvious sunshine duration mutation was in winter. Sunshine duration climate change spatial analysis showed that Xiaoer gully region sunshine time decline on the whole, and based on the analysis of mutation testing,1981 and 1998 was the year of climate mutation of sunlight.%通过小二沟地区近53 a的日照时数观测资料，分析小二沟地区日照时数年代际、年际、各季节、云量变化，并利用累积距平、线性倾向估计法、信噪比突变检验进行分析。小二沟地区（1957—2010年）日照时数、日照百分率和各季节日照时数都存在不同程度的减少趋势，10 a年日照时数递减率约为-12.1 h，且这种递减的趋势在增加。日照时数突变冬季最明显。对日照时数气候变化的空间分析表明，小二沟地区日照时数整体呈下降趋势，且根据突变检验分析，1981年和1998年为日照气候突变年份。