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Urbanization Effect on Climate in Beijing

ZHENG Si-Yi1,4 and LIU Shu-Hua2,31 Department of Environmental Engineering,Peking University,Beijing 1008712 Department of Atmospheric Sciences,Peking University,Beijing 1008713 Laboratory of Climate Research,National Climatic Center,China MeteorologicalAdministration,Beijing 1000814 China Meteorological Administration,Beijing 100081  
By climate observation data collected from 13 weather stations of Beijing region from the period from 1961 to 2000 and the data of yearbook in Beijing region,annual and seasonal variation of temperature,relative humidity and precipitation of urban and rural stations in Beijing area during those 40 years and the data of Beijing development were analyzed.The results showed that annual temperatures of urban and rural stations in Beijing area increased obviously.The average temperature and the lowest temperature in urban stations increased faster than those in rural ones.The urban heat island was also increasing and there was a significantly positive correlation between urbanization index and heat island intensity.The relative humidity in urban stations in Beijing area decreased while the relative humidity of rural stations in Beijing area increased slightly.Precipitations in Beijing area decreased obviously.The precipitation in urban stations decreased faster and fluctuated greatly than that in rural ones.Seasonal variation trends of temperature,relative humidity and precipitation of urban and rural stations in Beijing area were consistent with their annual variation trends.The differences of variation trends between some seasons and their annual resulted from the effect of urbanization and seasonal characteristics.The climate variation trends in Beijing during the recent 40 years and the data of Beijing development indicated that the rapid development of Beijing city and urbanization had greatly influenced the local climate change in Beijing.
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