当前位置: X-MOL 学术Build. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Analysis of the urban heat island under different synoptic patterns using local climate zones
Building and Environment ( IF 7.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.buildenv.2020.107268
Max Anjos , Admir Créso Targino , Patricia Krecl , Gabriel Yoshikazu Oukawa , Rodrigo Favaro Braga

Characterising the spatio-temporal variability of the Urban Heat Island intensity (UHII) is of utmost importance to understand processes related to air pollution dispersion and thermal comfort. However, this feature is still under-researched in most global cities due to instrumental limitations or lack of expertise. This study aims at investigating the influences of standard and subclasses of Local Climate Zones (LCZ) on the behaviour of the UHI in a Brazilian city using LCZs classification/sub-classification and in situ near-surface air temperature observations at different LCZ sites. Cluster analysis applied to daily meteorological data split the study period into five groups with similar weather characteristics. Each cluster was dominated by a combination of weather systems acting over the region which, in turn, determined the strength of the UHII. The overall diurnal UHII was strong during the nights and early mornings, with mean maximum values of 6.0 °C, and around 0 °C or negative during the rest of the day. The largest UHII (11.0 °C) was registered under anticyclone conditions, whilst the smallest ones (around 0 °C) were always observed under overcast and rainy conditions regulated by the passage of troughs, cold fronts and mesoscale complex systems. The spatial distribution of the nocturnal UHII based on the sampled and predicted LCZ temperature analysis showed that the central areas were substantially warmer than its surrounding suburban and rural areas. The introduction of six LCZ sub-classes was considered as consequence of the mixing of urban fabric and revealed a suitable mapping approach to describe the land use and cover and evaluate the air temperature field. The LCZ map helped identify key climatic areas which could be used in planning strategies to target the UHI effects and create both aesthetically pleasant and healthy cities.

中文翻译:

利用局地气候带分析不同天气模式下的城市热岛

表征城市热岛强度 (UHII) 的时空变异性对于了解与空气污染扩散和热舒适性相关的过程至关重要。然而,由于工具限制或缺乏专业知识,在大多数全球城市中,这一功能仍未得到充分研究。本研究旨在使用 LCZ 分类/子分类和不同 LCZ 站点的原位近地表气温观测,调查地方气候区 (LCZ) 的标准和子类对巴西城市 UHI 行为的影响。应用于日常气象数据的聚类分析将研究期间分为具有相似天气特征的五组。每个集群都由作用于该地区的天气系统组合主导,反过来,决定了 UHII 的强度。整个昼夜 UHII 在夜间和清晨很强,平均最大值为 6.0 °C,在一天的其余时间为 0 °C 左右或负值。最大的 UHII (11.0 °C) 记录在反气旋条件下,而最小的 UHII (大约 0 °C) 总是在受低谷、冷锋和中尺度复杂系统通过的阴雨条件下观察到。基于采样和预测的 LCZ 温度分析的夜间 UHII 的空间分布表明,中心地区比其周围的郊区和农村地区要暖和得多。六个 LCZ 子类的引入被认为是城市结构混合的结果,并揭示了一种合适的绘图方法来描述土地利用和覆盖以及评估气温场。LCZ 地图有助于确定关键气候区域,这些区域可用于规划战略,以针对 UHI 效应并创建美观宜人且健康的城市。
更新日期:2020-11-01
down
wechat
bug