Regional climate change and local urbanization effects on weather variables in Southeast China |
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| Authors: | Ji Chen Qinglan Li Jun Niu Liqun Sun |
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| Institution: | (1) Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China |
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| Abstract: | This paper presents the analyses of regional climate change features and the local urbanization effects on different weather
variables over Southeast China. The weather variables considered are: daily mean (Tm), minimum (Tmin), and maximum (Tmax) near surface air temperature, diurnal temperature range (DTR), relative humidity (RH), and precipitation (P). With analysis
of two datasets (a station dataset for the period from 1960 to 2005 that is mainly used and a grid dataset for the period
1960–2000), this study reveals that the trends in the variations of these weather variables can be separated into two periods,
before and after 1984. Before 1984, there were no significant urbanization effects, and Tmin, RH, and P steadily increased but Tmax decreased, resulting in a considerable decrease in DTR and a slight decrease in Tm. After 1984, Tmin and Tmax increased considerably, and the urbanization influence on Tmin, but not Tmax, is observable. The urbanization effect causes an extra increasing trend in Tmin with a rate of about 0.6°C/decade and, accordingly, extra decreasing trends in DTR and RH. The analysis of the seasonal trends
reveals that the urbanization influence results in a near-uniform increase of Tmin for all four seasons and a strong decrease of RH in summer and autumn. Moreover, there is no significant change in P at the
annual scale and an increasing rate of 11.8%/decade in summer. With the urbanization influence, a considerable increase in
P is noticeable at the annual scale; specifically, the increasing rates of 18.6%/decade in summer and 13.5%/decade in autumn
are observed. |
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