均一化前后河南省年平均最高气温和高温日数的对比分析  

Comparative Analysis of Annual Mean Maximum Temperature and High-temperature Days Before and After Homogenization in Henan Province

作　　者：左璇[1,2] 姬兴杰[1,2] Zuo Xuan;Ji Xingjie(CMA.Henan Key Laboratory of Agrometeorological Support and Applied Technique,Zhengzhou 450003,China;Henan Climate Center,Zhengzhou 450003,China)

机构地区：[1]中国气象局·河南省农业气象保障与应用技术重点开放实验室,郑州450003 [2]河南省气候中心,郑州450003

出　　处：《气象与环境科学》2020年第4期36-41,共6页Meteorological and Environmental Sciences

基　　金：河南省气象局科研项目(KM201811)。

摘　　要：基于国家气象信息中心发布的逐日均一化气温资料,采用统计分析方法,对河南省均一化处理前后的年平均最高气温和高温日数序列的线性趋势进行比较评价。结果表明:1)对河南省55站(占总站的一半)因非自然因素引起的非均一性年平均最高气温资料的均一化处理,取得了明显的校正效果;55站中,因台站迁移因素造成平均最高气温资料非均一化的站点占69%;49站年平均高温日数资料经均一化得到订正。2)均一化前的资料使年平均最高气温均值被高估,增温趋势被低估;均一化后19512017年全省年平均最高气温均值降低0.1 ℃,增温速率增加了10%,各站均呈上升趋势,3站气候倾向率由负变正,豫东和北中部的16站气候变化倾向率减小,豫西和豫西北的36站气候变化倾向率增加。3)均一化前的资料使高温日数的均值和减少趋势被高估;均一化后高温日数均值减少了0.6天,减速缩小了7%,豫北和豫南等地的35站气候倾向率减小。The linear trend of annual mean maximum temperature and high-temperature days before and after homogenization in Henan province is analyzed with the statistical analysis method based on the daily homogeneity-adjusted surface temperature data from the National Meteorological Information Center of CMA.The result shows are as follows.1)The inhomogeneous problem caused by unnatural factors of annual mean maximum temperature at 55 meteorological stations (half of the total stations in Henan) is adjusted by homogenization significantly.The inhomogeneity of the mean maximum temperature caused by station migration contributes 69% among all the homogenized stations.The high-temperature days series of 49 stations have been adjusted by homogenization.2)The result of comparing maximum temperatures before and after homogenizing indicates that the data before homogenizing makes the annual mean maximum temperature overestimated and the warming trend underestimated.After homogenization,the annual mean maximum temperature in Henan during 19512017 reduces by 0.1 ℃.The warming rate increases by 10%,and all the 55 stations see the trend on the rise.Among the 55 stations,3 stations have the climate change tendency rate changing from negative to positive,16 stations,located in the eastern and north-central parts of Henan,see the tendency rate declining,but the other 36 stations in the west and northwest experiences the rising climate tendency rate.3)Analysis on the series of homogenized high-temperature days shows that the average value and trend of high-temperature days are overestimated before homogenizing.After homogenizing,the mean value of high-temperature days in 19512017 reduces by 0.6 days,and the deceleration reduces by 7%.The climate tendency rate at 35 stations decreases in the north and south of Henan.

关 键 词：均一化 河南 最高气温 高温日数 

分 类 号：P468[天文地球—大气科学及气象学]