摘要
为客观判定贵州省盛夏的旱涝急转事件,本文利用1981~2017年7~8月贵州省78站逐月降水资料,计算并分析了贵州省盛夏旱涝急转指数(I_(DFA))的时空演变特征。结果表明:1981~2017年贵州省盛夏旱涝急转指数的变化趋势并不明显,但年代际变化特征明显。单独用I_(DFA)来判定旱涝急转典型年并不完全准确,典型旱涝急转年的定义标准为:I_(DFA)绝对值大于1,其7、8月降水距平百分率绝对值在15%以上,且7、8月百分率之差的绝对值在50%以上。贵州省涝转旱频次的大值区位于遵义市南部、黔东南州北部,表明该区域易发生涝转旱事件;旱转涝频次的大值区位于遵义市北部、安顺市东部至黔东南州北部一带,表明该区域易发生旱转涝事件。
In order to objectively judge the abrupt of drought and flood in Guizhou Province during midsummer,using the monthly precipitation data of 78 stations in Guizhou Province from 1981 to 2017 to calculate and analyze the characteristics of spatial temporal variation of abrupt alternation of drought-flood abrupt alternation index.The results show that the changing trend of drought-flood abrupt alternation index in Guizhou Province from 1981 to 2017 is not obvious,but the interdecadal change characteristics are obvious.Using the drought-flood abrupt alternation index alone to determine the typical year is not completely accurate.The definition standard of the typical year of drought-flood abrupt alternation is:the absolute value of drought-flood abrupt alternation index is greater than 1,and the absolute value of the precipitation anomaly percentage in July and August is above 15%,and the absolute value of the percentage difference between July and August is above 50%.The large-value areas of the frequency of flood to drought abrupt alternation are located in the south of Zunyi and the north of Qiandongnan,which indicating that the area is prone to flood to drought abrupt alternation events.And the large-value areas of the frequency of drought to flood abrupt alternation are located in the north of Zunyi and the east of Anshun and the north of Qiandongnan,which indicating that the area is prone to drought to flood abrupt alternation events.
作者
李忠燕
张娇艳
王玥彤
王烁
陈早阳
曹蔚
LI Zhongyan;ZHANG Jiaoyan;WANG Yuetong;WANG Suo;CHEN Zaoyang;CAO Wei(Guizhou Climate Center,Guiyang 550002,China;Guizhou Key Laboratory of Mountainous Climate and Resource,Guiyang 550002,China)
出处
《高原山地气象研究》
2020年第2期59-62,共4页
Plateau and Mountain Meteorology Research
基金
中国气象局预报员专项(CMAYBY2019-106、CMAYBY2020-118)
国家自然基金项目(418650005)。
关键词
旱涝急转
盛夏
指数
drought-flood abrupt alternation
midsummer
index
