近63年聊城市高温热浪事件统计分析

Statistical Analysis of High Temperature and Heat Wave Events in Liaocheng City in Recent 63 Years

利用聊城国家气象观测站1957—2019年逐日最高气温资料,依据高温热浪定义,对该市近63年来高温热浪事件进行统计分析。结果表明:(1)聊城市年均高温日10.7 d,年均高温热浪1.3次。高温日、高温热浪事件集中在5—9月,且以6月出现最为频繁;(2)年高温日数逐年呈波动变化,总体呈逐年减少趋势,减少速率为0.35 d/10年;高温热浪事件历年呈波动变化,总体呈微弱减少趋势,减少速率为0.12次/10年;(3)Mann-Kendall法检验高温1968年前后交点为高温频次由少到多的突变,高温热浪没有发现突变点。

Using the daily maximum temperature data of Liaocheng national meteorological observation station from 1957to 2019, according to the definition of high temperature heat wave, the high temperature heat wave events in Liaocheng in recent 63years were statistically analyzed. The results showed that(1)The average annual high temperature day in Liaocheng is 10.7 days,and the average annual high temperature heat wave is 1.3 times. High temperature day and high temperature heat wave events are concentrated in May to September, and most frequently in June.(2) The number of annual high temperature days fluctuates year by year, and the overall trend is decreasing year by year, with a reduction rate of 0.35d/10 a. High temperature and heat wave events have fluctuated over the years, showing a weak decreasing trend as a whole, with a decreasing rate of 0.12 times/10 a.(3)MannKendall method tests that the intersection of high temperature before and after 1968 was a mutation of high temperature frequency from less to more. No mutation point was found in the high temperature heat wave.