近56年马鞍山市日照时数气候变化特征分析

Climate Change Characteristics of Sunshine Duration in Maanshan City in Recent 56 Years

利用马鞍山站1960-2015年日照时数、云量、降水等资料,采用M-K检验、线性趋势分析等统计方法,分析了马鞍山日照时数年、季变化特征以及可能影响日照时数的气象因子的变化特征,结果表明:马鞍山年日照时数呈显著减少的趋势,平均每10年减少74.0h,除春季日照时数变化不明显外,其他季节日照时数显著减少。年日照时数在1994年附近发生突变。云量和降水量是影响日照时数的因素,日照时数的显著下降与年降水量的增强关系密切,而与年平均总云量的减少无关。

Based on the date of sunshine duration, cloud cover, precipitation of Maanshan from 1960 to 2015, the annual, seasonal trend of the sunshine duration and the trend variation of meteorological factor of impacting on sunshine duration were analyzed by using the M-K test and linear trend. The results show that, the annual sunshine duration has shown a significant decreasing tendency during recent 56 years with a decreasing rate of 74.0h. （10a） -1. Except no obvious trend in spring, the obvious decreasing trend occurred in other seasons. There was an abrupt ehange in 1994, with the annual sunshine duration decreasing rapidly. The decrease of sunshine duration is mainly caused by the significant increase in annual precipitation. The annual mean total cloud amount is decreasing and exerting less influence, on the decreasing trends in the annual sunshine duration.