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《Journal of Beijing Normal University(Natural Science)》 2016-02
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Multi-scale temporal characteristics and periodic analysis of urban heat island——a case study of Beijing

GE Rongfeng;ZHANG Lixiao;WANG Jingli;TIAN Guangjin;FENG Yueyi;State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Beijing Normal University;Institute of Urban Meteorology CMA;  
Meteorological data of Beijing from 1978 to 2013were used to investigate the characteristics of inter-annual,seasonal,weekly and fixed hourly variations of urban heat island(UHI)effect.Periodic variation was probed by wavelet analysis.Inter-annual mean urban heat island intensity(UHII)presented an overall increasing trend at a rate of 0.24℃·(10a)-1 in Beijing from 1978 to 2013,due to acceleration of urban construction and urbanization.Seasonal UHII also changed significantly,being strongest in winter,weakest in summer.UHII varied at different times of the day,being the lowest at daytime and highest at nighttime.There is evident for a reverse"weekend effect",which signified that UHII was higher on weekend than during weekday.Wavelet analysis revealed four periods of inter-annual UHII,in which the 21 years was widely distributed throughout the study period.Similarly,the average daily UHII also showed four periods,of which120 days had the strongest periodic swings and became the main period.
【Fund】: 国家科技支撑计划资助项目(2012BAC13B01);; 国家自然科学基金创新研究群体科学基金资助项目(51421065)
【CateGory Index】: X16
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