應用福建中部沿海 10 個測站日降水量資料和 NCEP/NCAR 逐日再分析資料，分析了福建省中部沿
海地區前汛期（5～6 月）降水的低頻特徵和前汛期持續性暴雨過程的氣候特徵，分析了前汛期持續性
暴雨過程與低頻振盪的關係。結果表明：(1)福建省中部沿海地區前汛期降水存在明顯的准雙周振盪
(BWO)和季節內振盪(ISO)，低頻方差貢獻平均為 24%左右，而降水異常年份方差貢獻高達 70%以上；
(2)降水低頻變化強度（BWO、ISO 強度）和持續性暴雨過程都有明顯的年際和年代際變化；(3)前汛期
總雨量、持續性暴雨過程與降水的低頻變化強度正相關，降水低頻振盪強的年份在BWO 和ISO正位相
疊加時有利於出現持續性暴雨過程，從而使該年前汛期總雨量偏多；(4)當熱帶大氣低頻振盪(MJO)位於
西太平洋位相或位於印度洋位相且強度較強時，皆有利於福建中部沿海出現持續性暴雨過程。

Based on the NCEP/NCAR reanalysis data and ten stations’ observed precipitation data of the
mid-coastal region of FuJian,the Low-Frequency characteristics about daily precipitations and the climate
characteristics about continuous heavy rainfall processes and their relationships in pre- flood season over the
mid-coastal region of FuJian are studied. The results show that: (1) in pre-flood season over the mid-coastal
region of FuJian, the daily rainfall exhibits significant quasi-bioweekly oscillation (BWO) and interseasonal
oscillation (ISO). Low-frequency oscillation’s mean contribution to the total variance is about 24%, and up to
70% in anomaly years. (2)Both the strength of low-frequency and the frequency of continuous heavy rainfall
processes exists interannual and interdecadal variations. (3) Over the mid-coastal region of FuJian, the
strength of low-frequency oscillations, the continuous heavy rainfall processes and the total precipitation have
obvious positive correlation in pre-flood season. Strong low-frequency oscillications are advantageous to
continuous heavy rainfall and the totle precipitation when BWO and ISO are both in positive phase at the
same time. (4) There are more continuous heavy rainfall processes over mid-coastal region of FuJian when
MJO is in Pacific phase or strong Indian phase.