近一个半世纪来得法降水的变化特征

利用香港1853－1996年月降水资料，对香港19个时距，包括1－12月，春、夏、秋、冬、前、后汛期和年降水做了特征分析，发现香港降水有其显著的气候特征。

The Characteristics of the Precipitation in Hongkong over the Last 150 Years

Based on the monthly precipitation data of Hongkong for 1853-1996, the characteristics of the precipitation variations in 19 seasons ( Jan -Dec , spring, summer, autumn, winter, former rainy season, later rainy season and year) in HongKong are analyzed. It is found that the precipitation in Hongkong bears the similar features with monsoon rainfall There are distinct wet and dry seasons around a year.In the wet half year (Apr -Sep ), the monthly precipitation appears stable. About 52 percent of the annual precipitation takes place in summer, more than 85 percents in the rainy season, and only 14 8 percent in dry half year (Oct -Mar ). The precipitation in Hongkong exhibits significant periodicity. The precipitation variations of all the 19 seasons have respective significant periods with 90 percent confidence.Except April, November and December, there exist periods from 2 4 to 4 5 years in other seasons There are no long term variating trends in the monthly precipitation series.But in 5\|year moving average series the increasing trends are shown in former rainy season and annual precipitation while there are opposite trends in other seasons.