池州市高温日数及高温过程的气候变化特征

Climatic Variation Characteristics of High Temperature Days and High Temperature Processes in Chizhou City

利用1980—2019年池州市4个地面气象观测站逐日高温数据,采用趋势分析法和相关性检验等统计方法,对池州市高温日数和不同类型高温过程的变化特征进行分析。结果表明:近40年的东至、青阳、池州和石台4站高温日数年际变化均呈上升趋势,高温日数趋势线从2000年后均超过年平均值。东至、青阳、池州和石台4站在20世纪80—90年代年平均高温日数明显低于21世纪00年代以后,20世纪90年代后高温日数上升明显。4站在年代际高温过程变化不一致,但高温过程和中等高温过程均在21世纪00年代达到最多。池州市高温日数主要集中在7—8月,为7.3~14.2 d。东至站和青阳站夏季高温日数均呈现极显著上升趋势,通过0.01的显著性检验,气候倾向率分别为5.27 d/(10 a)和3.58 d/(10 a);石台站秋季呈现极显著上升趋势,通过0.01的显著性检验,气候倾向率为1.31 d/(10 a)。石台站最早出现高温时间为2007年3月30日,最晚为2019年10月10日,高温持续时间最长达24.0 d,极端最高气温为42.4℃。

Based on the daily high temperature data of 4 national stations in Chizhou City from 1980 to 2019,using the linear trend method and correlation test,the change characteristics of high temperature days and different types of high temperature processes in Chizhou City were analyzed.The results showed that the interannual change of high temperature days had a upward trend in Dongzhi,Qingyang,Chizhou and Shitai in the recent 30 a.The trend line of high temperature days had exceeded the annual average since 2000.Annual average of high temperature days in the 1980s—1990s was significantly lower than that after the 2000s,increased obviously after the 1990s in Dongzhi,Qingyang,Chizhou and Shitai.The interdecadal high temperature process changes of four stations were not consistent.However,high temperature process and medium high temperature process both reached the maximum in the 2000s.High temperature days in Chizhou mainly concentrated in July and August,ranging from 7.3-14.2 d.Dongzhi and Qingyang showed an extremely significant upward trend in summer,and passed the significance test of 0.01,their climatic trend rate was 5.27 d/10 a and 3.58 d/10 a,respectively.Shitai showed an extremely significant upward trend in autumn,and passed the significance test of 0.01,the climatic trend rate was 1.31 d/10 a.The extreme maximum temperature was 42.4℃in Shitai,and the longest high temperature duration was 24.0 d,the earliest and latest high temperature occurred on March 30,2007 and October 10,2019.