【摘要】 取上海市区各站点的平均温度与近郊站点的温度之差作为衡量城市热岛强度的指标,利用上海市城区和郊区的6个Davis自动气象观测仪每小时观测的记录,对2000年的温差序列进行小波变换,分析上海市城市热岛强度时间-频率的多时间尺度的演变规律.结果表明:小波分析能在波幅的时间-尺度图上进行宏观分析,低频小波波幅的发展、加强与城市热岛的强弱相对应.上海城市热岛的周期变化在时间域上分布不均匀,冬季热岛变化以14h和26h尺度为主,而夏季以12h和28h尺度较为明显.同一尺度上冬季上海市热岛强度变化明显,变化幅度大(热岛强度最大达5.6℃),相对应的波的振荡频率快,振幅较大;夏季反之.更多还原

【Abstract】 The characteristics of the urban heat island(UHI) intensity in Shanghai were studied and calculated using wavelet transformation, based on per hour difference in temperatures in 2000 observed from Davis automatic stations installed at the Urban and Suburb of Shanghai.The results show that the period characteristics of UHI in Shanghai are asymmetric,which correspond with the period extending between wavelet amplitude centers and the strengthening of wavelet amplitude.Wavelet transformation can be used to analyze UHI synoptically.The UHI appears obvious on 14 hour-scale and 26 hour-scale in winter, while 12 hour-scale and 28 hour-scale in summer.The UHI in winter is stronger and more obvious than in summer.更多还原