摘要
基于1979—2020年的月降水数据计算标准化降水指数(SPI),分析了广东省近42年不同尺度的干旱时间和空间特征,结果发现:(1)1979—2020年广东省有略湿润趋势;SPI10年干旱倾向为“三明治”状分布,珠三角和粤北地区逐渐湿润化,粤东和粤西呈略干旱化。(2)广东省年际SPI分布主要有6种表现类型:模态1反映南涝北旱或北涝南旱2种类型;模态2反映东旱西涝或西旱东涝2种类型;模态3反映沿海涝内陆旱或沿海旱内陆涝2种类型。(3)基于季节尺度:春季的干旱化趋势最为明显,夏季非干旱化趋势明显;秋季是广东地区干旱的高发时期,干旱分布最广;春季发生轻旱以上等级的地区主要位于雷州半岛一带;秋冬连旱在广东普遍发生。
A standardized precipitation index(SPI) is determined based on the monthly precipitation data of Guangdong province from 1979 to 2020 and the spatiotemporal characteristics of droughts on various scales are analyzed for the 42 years studied. The results are shown as follows.(1) The province tends to get slightly wetter over the years studied. The 10-year drought tendency of the SPI tends to be distributed like a sandwich so that the Pearl River Delta and northern part of the province are gradually getting wetter while the eastern and western parts are slightly drier.(2) There are six types of annual SPI distribution for the province: Mode 1 reflects the conditions of flood in the south and drought in the north or vice versa, Mode 2 gives the conditions of drought in the east and flood in the west and vice versa, and Mode 3 tells the conditions of flood in the coast and drought in the inland area or vice versa.(3) For the seasonal scale, spring has the most significant trend of getting dry while summer has an obvious trend of getting wet. Autumn is the season when droughts happen frequently in the area of Guangdong and cover the most parts. The Leizhou Peninsula is the main area where springtime droughts take place on the light level or above. It is common for Guangdong to have droughts consecutively from autumn to winter.
作者
余锐
孙丽颖
焦玚
陆杰英
刘振邦
YU Rui;SUN li-ying;JIAO Yang;LU Jie-ying;LIU Zhen-bang(Meteorological Bureau of Sanshui District,Foshan,Foshan 528100;Meteorological Bureau of Zhengcheng District,Guangzhou 511300;Meteorological Observatory of Guangzhou,Guangzhou 511430)
出处
《广东气象》
2023年第1期19-22,共4页
Guangdong Meteorology
基金
广东省科技计划项目(2019B121201002)
广东省气象局科学技术研究项目(GRMC2021XQ16)
佛山市气象局科学技术研究项目(201914)。
关键词
气候学
干旱
降水
标准化降水指数(SPI)
广东省
climatology
drought
precipitation
standardized precipitation index(SPI)
Guangdong province