摘要
基于1986—1995年民航广汉机场气象台逐日逐时人工观测资料,利用统计分析,带通滤波方法、功率谱分析和小波分析等方法,分析了广汉机场云的周期性变化特征。结果表明:广汉机场主要受层积云Sc、积云Cu两种低云影响,且二者具有相反的日变化特征,碎层云Fs、雨层云Ns和碎雨云Fn等出现频率很低。广汉机场云量的变化明显具有60—120 d的准季节周期、30—60 d季节周期和10—20 d准双周振荡。
Based on the hourly manual observational data from meteorological station at Guanghan airport from 1986 to 1995,the periodic characteristics of low cloud were analyzed by band-pass filtering method,power spectrum analysis method and wavelet analysis method.The results indicate that Guanghan airport is influenced by stratocumulus（Sc） and cumulus（Cu）,and the daily variation characteristics of the two clounds are contrary.Other clouds such as stratus fractus（Fs）,nimbostratus（Ns） and fracto-nimbus（Fn） seldom appear at Guanghan airport.Variations of the cloud cover show an obvious quasi-seasonal cycle of 60-120 day,an intra-seasonal cycle of 30-60 day and a quasi-biweekly oscillation cycle of 10-20 day.
出处
《气象与环境学报》
2011年第1期30-34,共5页
Journal of Meteorology and Environment
基金
国家自然科学基金(40775069)资助
关键词
低云
周期性变化
带通滤波
功率谱分析
小波分析
Low cloud
Periodicity
Band-pass filtering
Power spectrum analysis
Wavelet analysis
