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Urban heat island circulations of an idealized circular city as affected by background wind speed

机译：受背景风速影响的理想化圆形城市的城市热岛环流

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The Weather Research and Forecasting (WRF) Model is used to study the interaction between urban heat island circulation (UHIC) and its background wind. Two distinct wind regimes are found depending on the ratio of the horizontal convective scale velocity to the background velocity, which is referred to as the buoyancy velocity ratio. When the buoyancy velocity ratio is above two, coherent asymmetric vortex rings are exhibited, similar to the UHIC structure under calm conditions. For buoyancy velocity ratios below two, upper return UHIC currents at the upstream disappear in the two-dimensional cases and the coherent asymmetric vortex rings are destroyed in the three-dimensional cases. In these low buoyancy velocity ratio cases, background wind inhibits UHIC development at the leading edge of the urban area and UHIC is transported downstream from the urban center. As a result, a trailing vortex forms instead of a vortex ring. In all simulated cases with a background wind speed, a counter-rotating vortex pair exists. This remarkable feature does not exist under calm conditions and is attributed to the corresponding background wind speed. Holding urban heat flux constant, as the background wind speed decreases, the reverse region expands.
机译：天气研究与预报（WRF）模型用于研究城市热岛环流（UHIC）与背景风之间的相互作用。根据水平对流尺度速度与背景速度之比，发现了两种不同的风况，这称为浮力速度比。当浮力速度比大于2时，表现出相干的不对称涡流环，类似于在平静条件下的UHIC结构。对于低于2的浮力速度比，在二维情况下，上游的回流UHIC电流消失，而在三维情况下，相干的不对称涡环被破坏。在这些低浮力速比的情况下，背景风在市区前沿抑制了UHIC的发展，UHIC从市区向下游输送。结果，形成了尾涡而不是涡环。在所有具有背景风速的模拟情况下，都存在反向旋转的涡流对。在平静的条件下不存在此显着特征，这归因于相应的背景风速。保持城市热通量恒定，随着背景风速降低，反向区域扩大。

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