Analysis of Extreme Weather Events in Beijing during 1951-2008
1951~2008年北京极端天气事件分析

Based on the daily observation data during 1951-2008,the change of extreme weather events in Beijing are analyzed.Results show that:(1) The annual mean temperature,minimum temperature,and mist events show increasing trends of 0.39 ℃·(10 a)-1,1.0 ℃·(10 a)-1,and 12.4 d·(10 a)-1 respectively.The maximum 24-h rainfall shows a decreasing trend of-10.8 mm·(10 a)-1,rain days,humidity,gale,and thunder storm decrease at different extent -1.90 d·(10 a)-1,-1.17%(10 a)-1,-2.64 d·(10 a)-1,and-1.24 d·(10 a)-1],sand and dust events show a decreasing trend of-9.39 d·(10 a)-1.The maximum temperature,the maximum rain intensity(60 min),and rainstorm,frost,fog,high temperature events have little change.(2) Rainstorm,high temperature,the maximum temperature,and sand and dust events have no remarkable periodicity.Thunder storm,frost,the minimum temperature,the maximum 24-h rainfall,and mist events have periodical variation,their main periods are 6 a,7 a,16 a,12 a,and 12 a,respectively.(3) Urbanization has an effect on the warming records in Beijing.Extreme weather events may be influenced by certain weather systems,with less correlation with city development.