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气象:2020,46(6):801-812
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基于区域自动气象站的广东极端强降水特征分析
伍红雨,李芷卉,李文媛,郑璟
(广东省气候中心,广州 510641; 中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室,广州 510641)
Characteristics Analysis of Extremly Severe Precipitation Based on Regional Automatic Weather Stations in Guangdong
WU Hongyu,LI Zhihui,LI Wenyuan,ZHENG Jing
(Guangdong Climate Center, Guangzhou 510641; Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, CMA, Guangzhou 510641)
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投稿时间:2018-12-10    修订日期:2019-10-11
中文摘要: 利用2003—2017年广东2000多个区域自动气象站逐小时降水资料,分析了不同历时的广东极端强降水的年和月变化特征,在此基础上分析汛期4—9月的极端强降水频次的时空分布特征。结果表明:近15年来,广东不同历时极端强降水出现频率的年变化趋势存在明显差异,在年以及前、后汛期,24 h呈减少趋势;3、1 h呈上升趋势,其中1 h极端强降水频率在年和后汛期呈显著增加趋势。5—6月是广东极端强降水最易出现的时段,频次大值主要出现在粤西南阳江、江门、茂名,中部和北部的广州、清远以及粤东的汕头、揭阳等地。后汛期极端强降水主要出现在粤中南部地区,特别是南部沿海。1 h极端强降水次数在珠江三角洲以及茂名信宜、高州等地增加趋势明显,而粤东的大部分地区为减少趋势。地形和大气环流等可能是广东极端强降水频次中心形成的重要因素。
Abstract:Based on the hourly precipitation data of more than 2000 regional automatic weather stations du ring 2003-2017 in Guangdong, the characteristics of the annual and monthly variations of extremely severe 〖JP2〗precipitation with different durations in Guangdong were ana 〖JP〗lyzed. On this basis, the spatio temporal distributions of the frequency of extreme precipitation in the flood season from April to September were analyzed. The results showed that there are obvious differences among the annual frequency variation trends of extremely severe precipitation with different durations in Guangdong in the last 15 years. The frequency of 24 h precipitation tends to decrease in the annual, the first and the second flood seasons but those of the 3 h and 1 h precipitation increase. The frequency of 1 h extremely severe precipitation shows a significant increase in the annual and the second flood season. May-June is 〖JP2〗the most prone period for extreme precipi 〖JP〗tation in Guangdong, whose frequency is mainly found in Yangjiang, Jiangmen and Maoming in the southwest of Guangdong, Guangzhou and Qingyuan in the central and northern parts, as well as Shantou and Jieyang in the east of Guangdong. The extremly severe precipitation in the second flood season is mainly seen in the south central region, especially in the southern coast of Guangdong. The number of extremely severe precipitation for 1 h shows an increasing trend in the Pearl River Delta, Xinyi of Maoming and Gaozhou, while the trend for most of the eastern Guangdong decreases. Terrain and atmospheric circulation may be the important factors for the frequency center of extremely severe precipitation in Guangdong.
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基金项目:广东省科技计划项目(2017B020244002和2017B030314140),广东省气象局科技项目(GRMC2019M10和GRMC2017Z04)共同资助
引用文本:
伍红雨,李芷卉,李文媛,郑璟,2020.基于区域自动气象站的广东极端强降水特征分析[J].气象,46(6):801-812.
WU Hongyu,LI Zhihui,LI Wenyuan,ZHENG Jing,2020.Characteristics Analysis of Extremly Severe Precipitation Based on Regional Automatic Weather Stations in Guangdong[J].Meteor Mon,46(6):801-812.