石羊河流域复合高温干旱事件的识别及其演变特征  

Identification and evolution characteristics of compound high-temperature and drought events in the Shiyang River Basin

作　　者：杨晓玲[1,2] 孙旭映 杨金虎[1] 吴雯[2] 赵慧华 陈静 YANG Xiaoling;SUN Xuying;YANG Jinhu;WU Wen;ZHAO Huihua;CHEN Jing(Institute of Arid Meteorology,China Meteorological Administration,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key Laboratory of Arid Climatic Change and Reducing Disaster of CMA,Lanzhou 730020,China;Wuwei National Climate Observation Platform,Wuwei 733099,Gansu,China)

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]武威国家气候观象台,甘肃武威733099

出　　处：《干旱气象》2024年第6期836-843,共8页Journal of Arid Meteorology

基　　金：干旱气象科学研究基金项目“石羊河流域复合高温干旱事件识别与演变特征研究”(IAM202408);国家自然科学基金项目(42375039、42175192);第二次青藏高原综合科学考察研究项目(2019QZKK0105)共同资助。

摘　　要：复合高温干旱事件是石羊河流域高发的复合极端气候事件之一,对工农业生产和生态环境造成的影响比单一的极端气候事件更为严重。利用1961—2023年石羊河流域5个气象站平均气温、最高气温、降水等资料,采用百分位数阈值法和Ped气象干旱指数识别和确定复合高温干旱事件,采用线性趋势法分析复合高温干旱事件时空演变特征。结果表明:石羊河流域复合高温干旱事件多年平均频次的空间差异较小,但各年代内复合高温干旱事件平均频次空间差异明显,且空间差异有逐年代增大趋势。石羊河流域复合高温干旱事件年频次呈先减少后增多的趋势,全流域及各地均在1996年之前减少,之后增多。复合高温干旱事件主要出现在6—8月,7月最多。石羊河流域不同等级复合高温干旱事件发生频次变化较大,随着干旱等级的升高,干旱频次呈先增加后减少的趋势,中旱频次最多,特旱最少。Compound high-temperature and drought events is one of the complex extreme climate events with high incidence in the Shiyang River Basin,which has more serious impact on industrial and agricultural production and ecological environment than a single extreme climate event.Based on the average temperature,maximum temperature and precipitation data of five meteorological stations in the Shiyang River Basin from 1961 to 2023,the compound high-temperature and drought events were identified and determined using percentile threshold method and Ped meteorological drought index,and spatial and temporal evolution characteristics of compound high-temperature and drought events were analyzed with linear trend method.The results show that the spatial difference of annual average frequency of compound high-temperature and drought events was small in the Shiyang River Basin,however,the spatial difference of compound high-temperature and drought events frequency was obvious in each decade and increased decade by decade.Annual frequency of compound high-temperature and drought events decreased first and then increased in the Shiyang River Basin,it decreased before 1996 and then increased in the whole basin.Compound high-temperature and drought events mainly occurred from June to August,and the most occurred in July.The frequency of compound high-temperature and drought events with different grades changed greatly,with the increase of drought grade,the frequency of drought increased first and then decreased,the frequency of medium drought was the highest,and the frequency of extreme drought was the least.

关 键 词：石羊河流域 复合高温干旱事件 气象干旱指数 识别 演变特征 

分 类 号：P468.026[天文地球—大气科学及气象学]