Potsdam Institute for Climate Impact Research - PIK, Member of Leibniz Association, P.O. Box 60 12 03, Potsdam, 14412, Germany.
Institute for Environmental Science and Geography, University of Potsdam, Am Neuen Palais 10, 14469, Potsdam, Germany.
Nat Commun. 2020 May 27;11(1):2647. doi: 10.1038/s41467-020-16461-9.
The canopy layer urban heat island (UHI) effect, as manifested by elevated near-surface air temperatures in urban areas, exposes urban dwellers to additional heat stress in many cities, specially during heat waves. We simulate the urban climate of various generated cities under the same weather conditions. For mono-centric cities, we propose a linear combination of logarithmic city area and logarithmic gross building volume, which also captures the influence of building density. By studying various city shapes, we generalise and propose a reduced form to estimate UHI intensities based only on the structure of urban sites, as well as their relative distances. We conclude that in addition to the size, the UHI intensity of a city is directly related to the density and an amplifying effect that urban sites have on each other. Our approach can serve as a UHI rule of thumb for the comparison of urban development scenarios.
树冠层城市热岛（UHI）效应表现为城市地区近地表空气温度升高，使城市居民在许多城市，特别是在热浪期间面临额外的热应激。我们在相同的天气条件下模拟不同生成城市的城市气候。对于单核城市，我们提出了对数城市面积和对数总建筑面积的线性组合，这也捕捉到了建筑密度的影响。通过研究各种城市形状，我们进行了概括，并提出了一种简化形式，仅根据城市场地的结构及其相对距离来估计 UHI 强度。我们的结论是，除了规模之外，城市的 UHI 强度还直接与其密度以及城市场地之间的放大效应有关。我们的方法可以作为城市发展情景比较的 UHI 经验法则。
