海南热带气旋降水的气候特征

整理出海南1962-2004年的热带气旋的降水资料,我们分析了海南省热带气旋降在海南省总降水中的地位及其变化特征,结果表明:海南热带气旋降水平均占年总降水量30%,但呈每10 a 3%的显著线性下降趋势;海南热带气旋降水与年总降水相关显著,年总降水显著偏少的年份,热带气旋降水偏少;热带气旋降水显著偏多的年份,年总降水量偏多;海南热带气旋降水变化的空间特征表现为明显的一致型,时间特征表现明显的周期性:高频的年际变化周期70年代前期以前为3 a周期为主,80年代中期以后以2 a的周期为主;低频的年际变化周期80年代以前以8—9 a为主,80年代以后以准6 a为主;年代际变化则以准17 a的周期为主。

HAINAN TROPIC CYCLONE RAINFALL'S CLIMATE CHARACTERS

Based on tropic cyclone rainfall in Hainan from 1962 to 2004,Hainan Tropic Cyclone rainfall's status,its climate change characters and the mainly impacting factors are analyzed.Results show that the rate of Hainan Tropic Cyclone rainfall amounts to about 30 percent of whole precipitation,but it has a linear decreasing tendency at the rate of 3 percent every 10 years.Spatial character of Hainan Tropic Cyclone rainfall's change assumes persistence and temporal character of that change assumes periodicity.High frequent annual periods mainly are 2 years before 1970's and 3 years after middle 1980's.Low frequent yearly periods mainly are 8 to 9 years before 1980's and quasi 6 years after then.Decadal period mainly is quasi 17 years.