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Urban heat island circulations over the Beijing-Tianjin region under calm and fair conditions

机译：在平静和公平条件下，城市热岛循环北京 - 天津地区

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摘要

The Beijing-Tianjin-Hebei region has experienced severe urban heat island (UHI) effects in recent decades. Using the Weather Research and Forecasting (WRF) model and the new World Urban Database and Access Portal Tools (WUDAPT) land-use dataset, the urban heat island circulations (UHICs) and other local atmospheric circulations over Beijing and Tianjin were studied during a severe UHI event in 2012. It was shown that in the daytime, various UHICs over Beijing and Tianjin developed separately under a southerly background wind. Two of these UHICs formed over Beijing due to multiple hot regions, involving a chain flow mechanism in which the outflows from one UHIC over nearby mountains were connected to the inflows to the other UHICs in a west-to-east direction. At night, more robust UHICs occurred and a chain flow mechanism again formed over the Beijing-Tianjin region, as the upper-level outflows from the UHIC over Tianjin were connected to the inflows of the UHIC over Beijing. Moreover, the rotary air movements formed by the flows over the mountain and the down-slope winds formed a convergent region in the northwest of Beijing. In particular, sensitivity experiments replacing either Beijing or Tianjin with cropland grids revealed that the presence of either of those urban areas modified the penetration of the sea-breeze circulation. The city shape was found to affect the UHIC over Beijing at night, as the convergent zones were distributed diagonally and the wind speeds were higher in the diagonal direction.
机译：北京天津 - 河北地区近几十年来经历了严重的城市热岛（UHI）效果。使用天气研究和预测（WRF）模型和新的世界城市数据库和接入门户工具（WUDAPT）土地使用数据集，在严重的情况下研究了北京和天津的城市热岛循环（UHICS）和当地大气环流紫外线活动在2012年。显示在白天，在北京和天津的各种Uhics在南风背景风下分开开发。由于多个炎热地区，这些UHIC中的两个是在北京形成的，涉及一种链流量机制，其中来自附近山脉的一个Uhic的流出与西到东方的其他UHIC的流入。在晚上，发生了更强大的Uhics，并且在北京 - 天津地区再次形成了一个较强的连锁机制，因为来自天津的Uhic over over over天津的上层流出与北京的Uhic的流入。此外，通过山上的流动形成的旋转空气运动和下坡风在北京西北形成的会聚区域。特别是，敏感性实验取代北京或天津与农田网格透露，这些城市地区的存在修改了海风循环的渗透。发现城市形状在夜间影响北京的Uhic，因为收敛区域对角分布，在对角线方向上较高。

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