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The mechanism of urban agglomeration causing the enhancement of regional extreme heat and drought events
Atmospheric Research ( IF 4.5 ) Pub Date : 2024-10-05 , DOI: 10.1016/j.atmosres.2024.107716 Yulong Ren, Ping Yue, Jinhu Yang, Qiang Zhang, Sha Sha, Xiaoyun Liu, Yaling Lu
Atmospheric Research ( IF 4.5 ) Pub Date : 2024-10-05 , DOI: 10.1016/j.atmosres.2024.107716 Yulong Ren, Ping Yue, Jinhu Yang, Qiang Zhang, Sha Sha, Xiaoyun Liu, Yaling Lu
Urban agglomerations formed by rapid urbanization have been found to be important ways through which human activities influence regional weather and climate. However, the role of urban agglomerations in the formation of extreme heat and drought events remains unclear. We perform numerical simulations using RegCM 5.0 on an August 2022 extreme heat event in the Yangtze River Basin in China. The results show that urban agglomerations lead to significantly increased temperature in both urban (0.6 °C increase) and non-urban (0.2 °C increase) areas. The land feedback formed by urban agglomerations significantly increases the surface sensible heat, turbulence activity, urban upward movement, and urban heat island effect. As a result, the sinking airflow is enhanced, the surface wind is increased, and a dome-shaped wind field anomaly is formed around the urban agglomerations. This widens the geographic scope of the heat event and heightens its intensity.
更新日期：2024-10-05
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