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Analysis of the urban heat island under different synoptic patterns using local climate zones

机译：利用当地气候区分析不同舞蹈模式下的城市热岛

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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 instrument 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. 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 degrees C, and around 0 degrees C or negative during the rest of the day. The largest UHII (11.0 degrees C) was registered under anticyclone conditions, whilst the smallest ones (around 0 degrees 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 the suburban and rural areas. The introduction of six LCZ sub-classes revealed to be a suitable mapping approach to describe the land use and cover and evaluate the air temperature field in areas with mixed urban fabric . 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.
机译：表征城市热岛强度的时空变异性（UHII）最重要的是了解与空气污染分散和热舒适有关的过程。然而，由于仪器限制或缺乏专业知识，在大多数全球城市中仍在研究此功能。本研究旨在调查当地气候区（LCZ）的标准和亚类对巴西城市UHI行为的影响，使用LCZS分类/子分类和原位近地气温观察。应用于日常气象数据的聚类分析将研究期分成五组，具有类似的天气特性。每个群集都是由作用在该区域的天气系统的组合，反过来确定UHII的强度。整个昼夜Uhii在夜间和清晨的夜间强烈，平均最大值为6.0摄氏度，以及在一天剩下的时间内或阴性约为0.在反周潮条件下，最大的UHII（11.0摄氏度）在反岩条件下注册，而在阴槽，冷锋和Mesoscale复杂系统中，始终观察到最小的（左右0）（约0摄氏度）。基于取样和预测的LCZ温度分析的夜间UHII的空间分布表明，中央区域比郊区和农村地区更温暖。六个LCZ子类的引入显示是一种合适的映射方法来描述土地使用和覆盖，并评估混合城市面料区域的空气温度场。 LCZ地图有助于识别可用于规划策略的关键气候区域，以瞄准UHI效应，并创造美学上愉悦和健康的城市。

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