1955—2016年甘肃定西地区极端气温变化特征  

Study on Variations of Extreme Temperature in Dingxi Area of Gansu Province during 1955-2016

作　　者：景雅雅 邵天杰 赵景波[1,2] Jing Yaya;Shao Tianjie;Zhao Jingbo(College of Tourism and Environment,Shaanxi Normal University,Xi an 710062,China;National Experimental Teaching Demonstration Center of Geography,Shaanxi Normal University,Xi an 710062,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi an 710075,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710062 [2]陕西师范大学地理学国家级实验教学示范中心,陕西西安710062 [3]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安710075

出　　处：《气象与减灾研究》2017年第4期265-275,共11页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金国际合作项重大项目(编号:41210002);中国科学院黄土与第四纪地质国家重点实验室项目(编号:SKLLQG1428);陕西自然科学基金(编号:2016JQ4004);中国博士后科学基金(编号:2016M592742)

摘　　要：利用甘肃省定西地区岷县、临洮和华家岭3个站点的气温数据,应用线性趋势拟合等方法,基于10个气温指数,研究了1955—2016年定西地区极端气温变化趋势和特征。结果表明,霜冻日数、结冰日数、冷日日数和冷夜日数4个指数呈下降趋势,而极端最高气温、极端最低气温、夏日日数、热夜日数、冷日日数和冷夜日数6个指数均呈上升趋势。气温变化的第一主周期为30 a,第二主周期为17 a。夏日日数、热夜日数、暖日日数和暖夜日数的变化在气温总体变化中起主要作用。极端最低气温与霜冻日数、冷日日数、冷夜日数显著相关,极端最高气温与夏日日数、暖日日数、暖夜日数显著相关,暖夜日数与霜冻日数也具有较高的相关性。气温指数突变大多发生在1993—1999年。Based on the daily temperature data from 1955 to 2016 in Minxian,Lintao and Huajialing of Dingxi area and 10 temperature indexes,the variation trend and characteristics of temperature in Dingxi was discussed using linear fitting and some other methods.The results showed that:1)4 indexes including frosting days,freezing days,cold days and cold night days presented downward trends,while the days of extreme highest(lowest)temperature,summer day,hot night,warm day and warm night showed upward trends.2)The temperature variation had a first cycle of 30 a and a second cycle of 17 a.3)The days of summer day,hot night,warm day and warm night played important roles in overall climate variation of Dingxi district.4)The extreme lowest(highest)temperature was significant related to the days of frosting(summer)day,cold(warm)day and night.The days of frosting day and warm night also showed significant correlation.5)A sudden change of the temperature indexes almost occurred during 1993-1999.

关 键 词：极端气温 变化趋势 变化周期 突变 

分 类 号：P467[天文地球—大气科学及气象学]