Study on the reality of urban heat islands in Shanghai, China

点击翻译按钮获取中文摘要

This study had two main purposes; the first was to pursue a cost-effective approach to developing observation and monitoring techniques for studying urban heat island (UHI) in large cities in developing countries, and the second was to clarify the effects of municipal parks on mitigating UHI.That was proved that between 1984 and 2005, there have been sharp temperature rises in Shanghai and Tokyo, two Asian mega cities. The annual mean temperature in Shanghai has increased by over 1.8℃ in the past 20 years. The results of field observations in 2005 clearly showed that the UHIs appear on cloudless days not only in autumn and winter, but also in spring and summer. The UHI reached its greatest intensity on cloudless nights between 22:00 and 23:00, when the UHI intensity was over 3.5℃ in July depending on the wind speed and direction. In particular, the lower UHI intensity in parks developed after 19:30, and the greatest difference of mean UHI intensity between parks and central urban residential areas reached 1.5℃ between 21:00-23:00 in July and August.