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<p>The influences of atmospheric circulation systems on urban heat islands (UHI) are significant but generally overlooked. To obtain a comprehensive insight into the influences of western Pacific subtropical high (WPSH) on UHI, this study simulated UHI in Hefei during four heatwaves using the Weather Research and Forecasting (WRF) coupled with the building effect parameterization coupled with the building energy model (BEP/BEM), a multilayer urban canopy module refined by the local climate zones (LCZ) scheme. Heatwaves from 2003 to 2023 are categorized according to the novel local WPSH forcing index (LWFI) proposed to quantify influences of WPSH considering both intensity and coverage of WPSH over the study area. Four heatwaves with LWFI values of 0, 0.005, 0.4, and 0.87 are chosen to represent UHI uninfluenced, slightly forced, partially forced and strongly forced by WPSH, respectively. An LCZ map of Hefei is produced to provide physical properties for LCZs in simulation using WUDAPT LCZ generator, of which overall classification accuracy is 0.88. Moreover, the correlation coefficient (R) between nocturnal UHI intensity (UHII) and LWFI is 0.46, indicating a moderate positive correlation. The differences between surface storage heat fluxes in real and urban-free scenarios are around − 80 to -100&#xa0;W∙<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{m}^{-2}\)</EquationSource> </InlineEquation>, dominating the variations of nocturnal UHI. The disparities in UHII among LCZs are revealed and explained by the diversities in the properties of LCZs. Results show that buildings with low aspect ratios and high sky view factors tend to present strong UHII.</p>

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Unveiling the Role of Western Pacific Subtropical High in Urban Heat Islands Using Local Climate Zones Coupled WRF-BEP/BEM

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Keqi Zhou,
  • Lei Zhong,
  • Jie Liu,
  • Zixin Wang,
  • Jinchen Liu

摘要

The influences of atmospheric circulation systems on urban heat islands (UHI) are significant but generally overlooked. To obtain a comprehensive insight into the influences of western Pacific subtropical high (WPSH) on UHI, this study simulated UHI in Hefei during four heatwaves using the Weather Research and Forecasting (WRF) coupled with the building effect parameterization coupled with the building energy model (BEP/BEM), a multilayer urban canopy module refined by the local climate zones (LCZ) scheme. Heatwaves from 2003 to 2023 are categorized according to the novel local WPSH forcing index (LWFI) proposed to quantify influences of WPSH considering both intensity and coverage of WPSH over the study area. Four heatwaves with LWFI values of 0, 0.005, 0.4, and 0.87 are chosen to represent UHI uninfluenced, slightly forced, partially forced and strongly forced by WPSH, respectively. An LCZ map of Hefei is produced to provide physical properties for LCZs in simulation using WUDAPT LCZ generator, of which overall classification accuracy is 0.88. Moreover, the correlation coefficient (R) between nocturnal UHI intensity (UHII) and LWFI is 0.46, indicating a moderate positive correlation. The differences between surface storage heat fluxes in real and urban-free scenarios are around − 80 to -100 W∙ \(\:{m}^{-2}\) , dominating the variations of nocturnal UHI. The disparities in UHII among LCZs are revealed and explained by the diversities in the properties of LCZs. Results show that buildings with low aspect ratios and high sky view factors tend to present strong UHII.