广东“龙舟水”降水分型分析  

Precipitation Patterns and Analysis During the “Dragon Boat Water” in Guangdong

作　　者：郭圳勉 简茂球[2] 张弘豪 黄先伦 

机构地区：[1]阳江市气象局,广东阳江529500 [2]中山大学大气科学学院,广东广州510275

出　　处：《广东气象》2016年第6期6-11,共6页Guangdong Meteorology

基　　金：广东省气象局科学技术研究项目基金(2014C09)

摘　　要：利用1972—2012年广东省86个地面观测站逐日降水资料、NCEP/NCAR 2.5°×2.5°再分析资料,采用EOF分解、Morlet小波分析等方法,分析了广东“龙舟水”近41年的时空特征及环流特征。结果表明：（1）EOF主要模态有全区一致型和东西反位相型,全区一致型周期为8~12年,东西反位相型从20世纪80年代起周期以2~4年为主。（2）广东“龙舟水”期间,在EOF第一模态正（负）极值年,华南上空200 h Pa层有（无）明显辐散异常;西太副高脊线偏南（偏北）;500 h Pa层的上升运动较强（弱）;850 h Pa上西南风强（弱）;在EOF第2模态正、负极值年的环流异常特征表现出明显的反相特征,尤其是在南海北部-华南地区。The climatic characteristics, spatial and temporal characteristics and the causes of the ＂dragon boat water＂ （sustained heavy rain taking place in early lunar May, shortened as ＂DBW＂） in Guangdong in the past 41 a are analyzed by using Morlet wavelet analysis and EOF and SVD methods. The results are shown as follows： （1） There are two main precipitation patterns, one is the region＇s consistent type and the other the eastern and western anti-phase type. From the 1980s, the period of the consistent type is 8 - 12 a, and the period of the Eastern and Western anti-phase type is 2 -4 a. （2） In the years of ex- treme positive （negative） first EOF mode during the DBW in Guangdong, there is （no） obvious divergence anomaly at 200 hPa over South China, the West Pacific subtropical high ridge is southward （northward）, upward motion is strong （weak） at 500 hPa, and southwest wind is strong （weak） at 850 hPa. In the years of extreme positive （negative） second EOF mode, the circulation anomaly shows obvious anti-phase charac- teristics, especially in the northern part of the South China Sea and South China.

关 键 词：气候学 “龙舟水” 降水分型 广东 

分 类 号：P46[天文地球—大气科学及气象学]