The Impact of Urbanization on Extreme Air Temperature in Nanjing

doi:10.11924/j.issn.1000-6850.casb17030046

Abstract

Abstract: The paper aims to scientifically understand the impact of urbanization on the extreme air temperatures. Based on the observed daily maximum air temperatures and minimum air temperatures at three urban stations and three rural stations in Nanjing during the period of 1961 to 2005, the average values and change trends of 17 extreme temperature indices for urban and rural stations were analyzed. The impact and contribution of urbanization on the variation trends of extreme temperature indices were also estimated. Results showed that warm events increased, while cold events decreased in Nanjing during 1961 to 2005. However, compared to rural stations, there were more warm events and less cold events for urban stations. Extreme value indices and mean value indices both exhibited increasing trend, and were larger at urban stations than that at rural stations. Impact of urbanization on the variation trends of extreme temperatures showed two characteristics. On one hand, urbanization accelerated the change rates of extreme temperature indices. The increasing rates of warm events, extreme value indices and mean value indices and the decreasing rates of cold events were both improved due to the urbanization. On the other hand, the trends of indices based on daily minimum temperature were more significant than that based on daily maximum air temperature. The contribution of urbanization on change trends was larger for warm events than that for cold events, and larger for extreme value indices and mean value indices of minimum air temperature than that for extreme value indices and mean value indices of maximum air temperature.

CLC Number:

Huang Rong,Gong Nianzu,Liu Huawei,Hu Shanshan,Duan Chunfeng and Li Xuan. The Impact of Urbanization on Extreme Air Temperature in Nanjing[J]. Chinese Agricultural Science Bulletin, 2017, 33(21): 118-125.

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