1981~2014年湖南汝城县气候变化特征分析

Analysis of the Characteristics of Climate Change in Rucheng during 1981 to 2014

摘要: 利用1981~2014年郴州市10个气象站的逐日气温实测资料以及汝城站逐日降水资料，采用滑动平均、Mann-Kendall与Morlet小波分析等统计诊断方法对汝城县34年的气候特征进行分析。结果表明，1) 汝城县的年均气温总体上经历了从降温到增温的过程，气温突增是从1996年开始的，年均气温呈现4年及11年的准周期变化特征。2) 汝城气候冬暖夏凉，为湖南省气候舒适期最长的城市，夏季平均气温为24.9℃，冬季平均气温为7.7℃。3) 汝城县年降水量线性趋势不明显，以2~5 a的年际周期为主，可分为一个多雨期和两个少雨期。4) 汝城县降水主要集中在春季和夏季，异常降水主要出现在21世纪。

Abstract: Based on the daily temperature data at 10 stations in Chenzhou and the daily precipitation data of Rucheng during the period from 1981 to 2014, the climatic characteristics of Rucheng were studied by applying the moving average, Mann-Kendall and Morlet wavelet analysis methods. The results show that: 1) The annual average temperature is through a process of decreasing first and then increasing, rising abruptly in 1996 and the temperature has both 4 and 11 years quasi-periodic variations. 2) With the longest climatic comfortable period, the climate of Rucheng is fairly mild in winter and rather cool in summer. The average temperature is 24.9˚C in summer and 7.7˚C in winter. 3) The linear trend of precipitation in Rucheng is not significant, but there is a 2 to 5 year oscillation which is divided into one pluvial period and two dry periods. 4) The peak of precipitation of Rucheng happens in spring and summer; the anomalous precipitation events are concentrated in the 21th century.