摘要
为识别中国南北过渡带的干旱状况,利用研究区内1960-2015年32个气象站逐月降水量和月平均气温等资料,计算每个站点的逐月综合气象干旱指数CI,并利用累积距平法等分析中国南北过渡带干旱变化情况。结果表明:就时间变化而言,干旱强度、干旱历时以及不同等级的干旱发生频率随时间均呈上升趋势,并且,轻旱在所有等级干旱中占比最重,为55.6%;就季节变化而言,干旱的发生具有季节性规律,春旱的强度最大,且历时较长,夏旱最易发生,秋旱的发生频率总体呈现出先增大后减小的趋势,在20世纪90年代达到最大值,冬旱的历时值最短;就空间变化而言,研究区内北部相对干旱,南部相对湿润,武都地区和研究区内的河南地区最为干旱,甘肃南部反而是整个研究区最湿润的地区。
In order to identify the occurrence of drought in the North-South transitional zone(Qinling-Dabashan)of China,this paper used monthly precipitation and mean temperature of 32 meteorological stations from 1960 to 2015 to calculate the monthly drought in the study area.The meteorological drought index CI and the cumulative anomaly method based on the principle of meteorological drought classification were used to analyze the drought changes in the North-South transitional zone of China.The results showed that the drought intensity,duration and frequency of different levels of drought increased with time,and the light drought accounted for the most in all levels of drought,which was 55.6%.The occurrence of drought had a seasonal pattern.The intensity of spring drought was the largest and the duration was long.The summer drought was the most likely to occur.The frequency of autumn drought generally increased first and then decreased,reaching maximum in the 1990 s.The duration of winter drought was relatively short compared to other seasons.In terms of spatial change,the northern part of the study area was relatively dry,and the south was relatively humid,the Wudu area and the Henan region was the airdest,whereas the southern part of Gansu was the wettest region in the entire study area.
作者
果华雯
张元伟
宋小燕
张静
刘国庆
GUO Huawen;ZHANG Yuanwei;SONG Xiaoyan;ZHANG Jing;LIU Guoqing(Northwest A&,F University,Yangling712100,China;Liaoning Liaoyang Hydrology Bureau,Liaoyang 111000,China)
出处
《南水北调与水利科技（中英文）》
CAS
北大核心
2020年第2期79-85,158,共8页
South-to-North Water Transfers and Water Science & Technology
基金
国家科技基础资源调查专项(2017FY100904)
国家自然科学基金(41501022)。
关键词
干旱
综合气象干旱指数
时空变化
中国南北过渡带
drought
comprehensive meteorological drought index
time and space change
China North-South transition zone
