Contrasting changes of urban heat island intensity during hot weather episodes
Contrasting changes of urban heat island intensity during hot weather episodes
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DOI：
10.1088/1748-9326/ab506b
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发表时间：
2019-12-01
影响因子：
6.7
通讯作者：
Scherer, Dieter
中科院分区：
文献类型：
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作者：
Fenner, Daniel;Holtmann, Achim;Scherer, Dieter
城市通常表现出比农村地区更高的气温，这种现象被称为城市热岛效应。在炎热天气期间，热岛热岛强度（UHII）是否加剧或减弱，报告了对比结果。研究人员利用一组来自高质量气象站的观测数据，以及位于德国柏林市区的数百个众包公民气象站的观测数据，在2015年至2018年的四年时间里对这种对比进行了调查。可以证明，如果hes（这里定义为5月最热的10%的白天或夜晚）？9月，通过白天条件或市中心站点的夜间条件确定，然后夜间UHII加剧。然而，如果通过农村地区的夜间情况来确定hwe，那么夜间UHII就会减少。这些UHII变化的差异可能与普遍的天气条件有关，即辐射、云量、风速、降水和湿度。这突出表明，除了土地覆盖变化之外，气候变化引起的未来天气条件变化将控制城市热应激危害。
Cities typically exhibit higher air temperatures than their rural surroundings, a phenomenon known as the urban heat island (UHI) effect. Contrasting results are reported as to whether UHI intensity (UHII) is exacerbated or reduced during hot weather episodes (HWEs). This contrast is investigated for a four-year period from 2015 to 2018, utilising a set of observational data from high-quality meteorological stations, as well as from hundreds of crowdsourced citizen weather stations, located in the urban region of Berlin, Germany. It can be shown that if HWEs, defined here as the ten percent hottest days or nights during May?September, are identified via daytime conditions, or by night-time conditions at inner-city sites, then night-time UHII is exacerbated. However, if HWEs are identified via night-time conditions at rural sites, then night-time UHII is reduced. These differences in UHII change can be linked with prevalent weather conditions, namely radiation, cloud cover, wind speed, precipitation, and humidity. This highlights that, beside land cover changes, future changes in weather conditions due to climate change will control UHIIs, and thus heat-stress hazards in cities.