Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.4747 |
The urban cool island phenomenon in a high-rise high-density city and its mechanisms | |
Yang, Xinyan1; Li, Yuguo1; Luo, Zhiwen2; Chan, Pak Wai3 | |
2017-02-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; England |
英文摘要 | The urban heat island (UHI) phenomenon has been studied extensively, but there are relatively fewer reports on the so-called urban cool island (UCI) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high-rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours (UCIdh) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high-rise, and high-density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high-rise compact city. In a low-rise, low-density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co-existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. |
英文关键词 | lumped urban air temperature model urban cool island degree hours urban heat island degree hours urban morphology |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000393415100025 |
WOS关键词 | HEAT-ISLAND ; SURFACE-TEMPERATURE ; ANTHROPOGENIC HEAT ; BOUNDARY-LAYER ; CLIMATE ZONES ; CANOPY LAYER ; MEAN WINDS ; HONG-KONG ; IMPACT ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/37725 |
专题 | 气候变化 |
作者单位 | 1.Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China; 2.Univ Reading, Sch Built Environm, Reading, Berks, England; 3.Hong Kong Observ, Kowloon, Hong Kong, Peoples R China |
推荐引用方式 GB/T 7714 | Yang, Xinyan,Li, Yuguo,Luo, Zhiwen,et al. The urban cool island phenomenon in a high-rise high-density city and its mechanisms[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(2). |
APA | Yang, Xinyan,Li, Yuguo,Luo, Zhiwen,&Chan, Pak Wai.(2017).The urban cool island phenomenon in a high-rise high-density city and its mechanisms.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(2). |
MLA | Yang, Xinyan,et al."The urban cool island phenomenon in a high-rise high-density city and its mechanisms".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.2(2017). |
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