近52年来滦河流域气候变化趋势分析

Climatic change characteristics in the latest 52 years in Luan River Basin

以滦河流域以及附近34个气象基站1957～2008年52年逐日气象资料为基础,采用M-K趋势检验方法分析了年降水、年均气温、年均相对湿度以及年日照时数等主要气象要素的年际、年内变化趋势。结果表明:整体上,滦河降水呈不明显下降趋势,夏季减少趋势最为显著;气温呈显著上升趋势,冬、春增温最为显著;日照时数整体呈显著下降趋势;相对湿度呈不明显下降趋势,夏季有减湿趋势,冬季有增湿趋势。近52年来滦河年降水、年均气温、年日照时数和年均相对湿度的Kendall倾向度分别为-12 mm/10 a、0.31℃/10 a、-6.8 h/a和-0.11%/10 a。

On the basis of the meteorological data from 34 meteorological stations from 1957 to 2008,the long-term trend of major climatic variables was analyzed by using M-K test method.The results showed that the annual precipitation showed a decreasing trend especially in summer.The annual air temperature experienced a significant increasing tendency,especially in winter and spring,while the annual sunshine hours exhibited a significant decreasing tendency.The mean annual relative humidity showed a slight decreasing trend,and there was a decreasing trend in summer while a increasing trend in winter.The results also showed that the Kendall slopes of precipitation,air temperature,sunshine hours and relative humidity were-12 mm/10a,0.31 ℃/10a,6.8 h/a and-0.11%/10a,respectively during the past 52 years.