摘要
采用经验正交函数分解(EOF)、快速富里叶变换(FFT)、连续(CWT)和正交小波变换(OWT),对近41 a来福建省25个代表站不同雨季旱涝指数(Z指数)序列进行了分析。结果表明:(1)福建旱涝在1965-1975年及1990年代具有显著的2-3a周期;(2)在1980年代中期以后南北反向变化具有显著的1a和3-4a周期;(3)中西部与其它区域的反向变化,在1985-1998年间有显著的1-2a周期,在1980年代以后9-13a周期较强;(4)近40年来有干旱趋势,南部(东部)比北部(西部)明显,其中1990年代这种趋势显著。(5)1960年代和1980年代相对湿润,而1970年代和1990年代则相对干旱。
41a (1961-2001) seasonal Z index series of 25 representative weather stations are investigated by virtue of EOF, FFT, continuous wavelet transformation (CWT) and orthogonal wavelet transformation (OWT). It shows that: (1) Fujian drought/flood (DF) has a significant 2-3a cycle for the periods 1965-1975 and 1990s; (2) the pattern, which represents the opposite DF trend between the southern and northern parts, has la and 3-4a cycles since the middle of 1980s; (3) EOF3, which denotes the reverse change between the middle-west region and other areas, has significant 1-2 cycle for the period from 1985 to 1998 and 9-13a cycle since 1980s; (4) there is a obvious drought trend for the last 40a (especially in the 1990's), which is more outstanding in the south (east) than in the north (west); (5) the 1960's and 1980's are relatively wet phases and the 1970's and 1990's are drought spells.
出处
《热带气象学报》
CSCD
北大核心
2006年第5期491-497,共7页
Journal of Tropical Meteorology
基金
国家科技部项目(2001DIB20116)
南京信息工程大学KLME开放课题(KJS02108)共同资助
关键词
福建
旱涝
时空变化
EOF
小波分析
Fujian
drought and flood
spatial/time features
EOF
wavelet analysis