摘要
利用1971-2010年北京地区20个测站降水资料和城市发展数据,分析了北京地区降水的大尺度变化趋势及局地降水的城市效应特征。结果表明:(1)北京地区年降水量具有大尺度变化特征,其线性倾向率为-9.12 mm·(10a)-1;(2)城市化缓慢期城市对降水影响不明显,而快速发展期则表现出明显的雨岛效应,城市化不仅使雨岛增强,还对城市下风向降水有一定影响;(3)受盛行风及热岛环流的共同影响,北京地区不同季节局地降水表现出不同的分布形态;(4)城市化过程对城区局地强降水日数存在增加效应。
Based on the precipitation data at 20 stations in Beijing and its urban development statistical data during 1971 —2010,the large scale interannual change trend of precipitation and city effect properties of local precipitation were studied.The results show that:(1) A large scale change characteristics is found in annual precipitation in Beijing,with a linear trend rate of-9.12 mm ·(10a)-1 and a break point in 1997.(2) Beijing behaves a dry island during lag phase of urbanization,and tends to be a rain island during rapid development of urbanization period.Urbanization can not only enhance rain island effect,but also make a certain influence on precipitation of downwind areas.(3) Precipitation spatial distribution in Beijing varies in different season due to the combined influence of prevail wind and heat island circulation.(4) Urbanization can also increase the number of local strong rainfall days.
出处
《高原气象》
CSCD
北大核心
2014年第2期522-529,共8页
Plateau Meteorology
基金
中国科学院战略性先导科技专项(XDA05090202)
国家自然科学基金项目(41175015)
城市气象研究基金项目(UMRF201108)
关键词
城市雨岛效应
年际变化
降水
北京
City rain island effect
Interannual change
Precipitation
Beijing
