【摘要】 根据河南省 5 0个站 195 1～ 2 0 0 0年的月平均气温资料 ,采用小波变换等方法分析了近 5 0年来河南省气温变化的时频特征。结果表明 ,河南省气温变化包含不同时间尺度的多层次演变特征 ,具有准 2年、4年、6～ 8年、16年和 2 8年左右的周期振荡 ,其中尤以 16年和 8年左右的周期最为显著 ;长期变化规律为 5 0、6 0年代气温较低 ,70、80年代变化平缓 ,90年代以来气温明显升高且强度较大。更多还原

【Abstract】 By means of power-spectrum and wavelet techniques, an analysis was conducted on the temporal frequency structure of temperature variation in Henan Province during the last 50 years, based on the data of 50 stations in Henan Province from 1951 to 2000. The results show that temperature variation in Henan has a multi-scale and multi-fold feature and periodic fluctuations of quasi-two, 4, 6 to 8, 16 and 28 years. Especially the periods of 16 and 8 years are most obvious. With respect to long-term variation, the air temperature in Henan in the 1950s and 1960s was relatively low, changed smoothly in the 1970s and 1980s and increased quickly in the 1990s.更多还原