近26年来南昌市气候变化特征

根据南昌市1983～2008年的气温、降水、日照时间、相对湿度等气候资料,采用相关性分析、线性回归分析、趋势分析等方法,研究了南昌市近26年来的气候变化特征。结果表明,26年来,南昌市气候变化的主要特征为气温急速上升、湿度急速下降。南昌市年均气温以0.54℃/10a的速率上升,达到极显著水平(P<0.000 1),多年平均气温为18.01℃,四季平均气温均呈上升的趋势,春秋季增温最明显,气候倾向率分别为0.89(P<0.000 1)、0.66℃/10a(P<0.000 1);年降水量以16.12 mm/10a的速率上升,多年平均降水量为1610.6 mm;年日照时间以42.26 h/10a的速率上升,春季日照时间显著上升(43.30 h/10a,P<0.01);年均相对湿度以-9.96%/10a的速率极显著下降(P<0.000 1),四季平均相对湿度倾向率分别为-10.00(P<0.005)、-11.59(P<0.000 1)、-9.67(P<0.005)、-8.57%/10a(P<0.05)。

Climate Change Features of Nanchang during the Late 26 Years

Based on the climate data about the temperature,precipitation,sunshine hours,relative humidity and so on in Nanchang City from 1983 to 2008,the climate change features of Nanchang during the late 26 years were studied by the methods of correlation analysis,linear regression analysis and trend analysis.The results indicated that,the climate change of Nanchang City during the 26 years was mainly characterized by the rapid increase of temperature and fast decrease of humidity.The average temperature of Nanchang increased at the rate of 0.54 ℃/10a,reaching the extremely significant level(P<0.000 1),the average temperature of 26 years was 18.01℃,the increasing trend of the average temperature appeared in all four seasons and was the most obvious in spring and autumn with a climate trend rates of 0.89(P<0.000 1) and 0.66 ℃/10a(P<0.000 1) respectively;the annual precipitation in Nanchang City increased by 16.12 mm/10a,the average precipitation of 26 years was 1610.6 mm;the annual sunshine hours in Nanchang City rose by 42.26h/10a,and the sunshine hours in spring increased significantly(43.30 h/10a,P<0.01);the annual average relative humidity in Nanchang City significantly decreased by-9.96%/10a(P<0.000 1),and the average relative humidity trend rates in four seasons were-10.00%/10a(P<0.005),-11.59%/10a(P<0.000 1),-9.67%/10a(P<0.005) and-8.57%/10a(P<0.05) respectively.