摘要
依据前人的研究和上海1949-2005年气象资料,研究了上海地区夏季降水特征,结果显示:上海夏季降水在时间分布上具有周期性变化,在1OO多年中有3个多雨湿润期和3个少雨偏干期;在空间分布上,因城市'雨岛'效应影响,城市和郊区差异明显.太阳活动周期对降水存在周期性的影响,ENSO事件对降水多寡有影响.火山爆发使降水出现1～2 a的较短的周期波动.
According to the climate records of Shanghai and other scholars' research during 1949-2005,we find the summer precipitation temporal distribution appears periodic variation.There are three rainy and humidity periods,and three little rain and dry periods during one hundred years.In precipitation spatial distribution,there are some difference between the urban areas and rural areas for the urban rain island effect.Three main natural reasons can explain this: the periodicity of solar activity,the influence of ENSO,and the volcanic explosion.
出处
《气象与环境科学》
2007年第3期14-19,共6页
Meteorological and Environmental Sciences
关键词
夏季降水
洪涝灾害
梅雨
台风暴雨
summer precipitation
flood disaster
Meiyu
typhoon and heavy rainfall
