福建暴雨频数的变化特征

本文选引起旱涝灾害最重的暴雨频数进行分析探讨，揭示其演变规律和影响背景，主要结论有：1)福建暴雨频数在变化过程中存在着准2a和准11a主要振动周期；2)随着气候的增暖，福建暴雨频数存在增多之趋势；3)若冷空气势力偏弱、欧亚盛行纬向环流、西太平洋和南海副高偏强、以及西太平洋海温偏高时有利于福建暴雨频数增多；反之，有利于暴雨频数减少．

Discussing on variation and influence factor of rainstorm frequency in Fujian

The rainstorm frequency caused heaviest drought and flood disaster wasanalyzed to reavealed evolutional rule and infective background. The primary results are found as follows. 1) In the vaviation of rainstorm frequency in Fujian,there and two major periods,namely quasi-biennial oscillation and quasi-11years oscillation. 2) The climate warms up, the rainstorm frequency shows an increasing tendency. 3) The weaker cold air force,the prevailing latitudinal circulation on Eurasia,the stronger subtropical high on the Western Pacific Ocean and the Sonth China sea,and the higher sea surface temperature on the Western PacificOcean are favourable to the increasing rainstorm frequency in Fujian,conversely,the rainstorm frequency decreases.