Analyzing the Characteristics of UHI (Urban Heat Island) in Summer Daytime Based on Observations on 50 Sites in 11 LCZ (Local Climate Zone) Types in Xi’an, China
Analyzing the Characteristics of UHI (Urban Heat Island) in Summer Daytime Based on Observations on 50 Sites in 11 LCZ (Local Climate Zone) Types in Xi’an, China
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DOI：
10.3390/su13010083
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发表时间：
2020-12
期刊：
影响因子：
3.9
通讯作者：
Yunwei Zhang;Jili Zhang;Xiaoqian Zhang;Dian Zhou;Zhaolin Gu
中科院分区：
文献类型：
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作者：
Yunwei Zhang;Jili Zhang;Xiaoqian Zhang;Dian Zhou;Zhaolin Gu
城市化引起了城市地区局部气候的显着变化。对于可持续的城市规划，有必要识别城市热岛（UHI）的分布特征和土地覆盖特性的影响。经常进行现场测量以获得城市气候研究中的关键数据。然而，在多个地点进行长时间连续观测仍然很少，尽管它们对于绘制城市热岛强度分布图很有用。在当前的工作中，在中国西安开展了三项观察活动。通过饮用水微环境站测量了 11 个当地气候区 (LCZ) 类型的 50 个地点的行人气温 (PLAT)。使用归一化 PLAT 研究冠层 UHI 特征和 LCZ 类型的影响。结果表明，土地覆盖类型和地表结构对当地气候有显着影响。高表面积分数建筑覆盖区域的PLAT高于低表面积分数建筑覆盖区域。在具有相似建筑面积的区域，建筑高度也会影响城市热岛辐射强度，因为高层建筑将为行人提供更多屏蔽。通过对观测结果进行统计分析，计算出每个 LCZ 类型内的平均 UHI 震级和标准差，这对于基于 LCZ 分类结果的城市地区 UHI 制图很有用。
Urbanization has induced significant changes on local climate in urban areas. For sustainable urban planning, it is necessary to identify the distribution characteristics of urban heat island (UHI) and the effects of land cover properties. In situ measurements are frequently carried out to obtain critical data in urban climate studies. However, long-time continuous observations on multiple sites are still rare, even though they would be useful in mapping the distribution of UHI intensity. In the current work, three observation campaigns were carried out in Xi’an, China. Pedestrian- level air temperatures (PLAT) were measured with potable micro-environment stations on 50 sites in 11 local climate zone (LCZ) types. The normalized PLAT was used to investigate the canopy layer UHI characteristics and the effects of LCZ types. Results revealed that the land coverage type and the surface structure have significant influence on the local climate. The PLAT in high-surface-fraction building covered areas was higher than that in low-surface-fraction building covered areas. In areas with similar building surface fraction, building height influences the UHI magnitude as well, as tall buildings would provide more shielding on the pedestrian level. The average UHI magnitude and the standard deviation within each LCZ type were calculated by statistical analysis of the observed results, which proved to be useful for UHI mapping based on the LCZ classification results in urban areas.