High-resolution regional modeling of urban moisture island: mechanisms and implications on thermal comfort

中尺度气象学 城市热岛 天气研究与预报模式 环境科学 海风 气候学 亚热带 白天 潜热 水分 峡谷 显热 城市气候 大气科学 气象学 地理 城市化 地质学 生物 地图学 经济 经济增长 渔业
作者
Ruiqing Du,Jiyun Song,Xinjie Huang,Qun Wang,Cheng Zhang,Oscar Brousse,Pak Wai Chan
出处
期刊:Building and Environment [Elsevier BV]
卷期号:207: 108542-108542 被引量:25
标识
DOI:10.1016/j.buildenv.2021.108542
摘要

The urban moisture island (UMI) can aggravate the thermal stress due to the urban heat island (UHI) in subtropical and tropical cities. In this study, we investigated the spatiotemporal variation patterns of UMI in Hong Kong, a subtropical coastal city, using the fine-resolution mesoscale Weather Research and Forecasting (WRF) model by integrating local climate zone (LCZ) maps based on the World Urban Database and Access Portal Tools (WUDAPT). Our results show that at regional scale, the UMI phenomenon tends to occur in coastal areas, possibly owing to rich moisture sources from sea breeze and inhibited moisture penetration due to barrier effects of mountains. Specifically, an all-day UMI effect was found in coastal low-density low-rise areas (LCZ5&8&10), while a nocturnal UMI effect and a daytime urban dry island (UDI) effect were found in coastal high-density high-rise areas (LCZ1&2). The UDI effect at daytime can be attributed to strong vertical moisture convection associated with intensive surface sensible heat fluxes in a strongly mixed urban boundary layer (UBL). The UMI effect at night can be attributed to blocked ventilation aisle, inhibited dewfall due to UHI, and weakened upward motion in a stable UBL. On the other hand, UMI can increase regional heat risks with additional 37.5% neighbourhoods in Extreme caution level and additional 6.1% neighbourhoods in Danger level. In addition, the impact of UMI on human thermal stress was found to be dominant at daytime in coastal low-density low-rise areas (LCZ5&8&10) and at nighttime in coastal high-density high-rise areas (LCZ1&2).
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