基于DI的南澳县气象干旱演变特征  

Characteristics of the Evolution of Meteorological Droughts in Nan’ao County Based on a Drought Index

作　　者：刘小勇 陈婷莎 许泽龙 张晓宇 LIU Xiao-yong;CHEN Ting-sha;XU Ze-long;ZHANG Xiao-yu(Meteorological Bureau of Nao’ao,Nao’ao 515900;Meteorological Bureau of Shaotou,Shaotou 515041;Meteorological Bureau of Chaoyang District,Shantou,Shantou 515100)

机构地区：[1]南澳县气象局,广东南澳515900 [2]汕头市气象局,广东汕头515041 [3]汕头市潮阳区气象局,广东汕头515100

出　　处：《广东气象》2021年第6期20-23,共4页Guangdong Meteorology

摘　　要：基于1962—2020年南澳县气象站逐日气象资料,采用干旱指数(DI)、线性趋势、M-K突变检验等方法研究了南澳县气象干旱的演变特征。结果表明:南澳县年平均气象干旱日数为113 d,以0.41 d/年的速率显著减少;季节性干旱明显,11月—次年3月为气象干旱多发期;1965和2019年为气象干旱日数突变减少的2个时段;年气象干旱日数存在20年的完整周期;平均每年出现2.1次气象干旱过程,过程平均日数49 d,干旱过程持续时间以10~60 d为主。Based on the daily meteorological data from a station of Nan’ao from 1962 to 2020 and with the methods of a drought index,linear tendency and Mann-Kendall abruptness test,this work studies the evolution characteristics of meteorological droughts in the county.The results are shown as follows.For Nan’ao,the annual average number of meteorological drought days is 113 d,which decreases significantly at a rate of 0.41 d/year.The drought is significantly seasonal,which takes place most frequently from November to the following March.1965 and 2019 are the two years in which the number of drought days decreases abruptly.The annual number of drought days has a complete period of 20 years.On average,there are 2.1 droughts every year,with each of them lasting for an average of 49 d,and a drought process persists mainly for 10 to 60 d.

关 键 词：气候学 气象干旱 干旱指数 南澳县 

分 类 号：P46[天文地球—大气科学及气象学]