A new perspective on evaluating high-resolution urban climate simulation with urban canopy parameters
ID:8 View Protection:PUBLIC Updated Time:2021-09-28 09:12:41 Hits:316 墙报交流

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Abstract
The ‘state-of-the-art’ urban climate models have not been evaluated against dense meteorological networks under various weather conditions. In this study, we conducted high-resolution urban climate simulations in Beijing and investigated the relationship between their performances and urban canopy parameters (UCPs). The latest version of single-layer (UCM) and multi-layer (BEP) urban canopy models were tested separately. Results show that model performances are insensitive to rainfall events in summer, but change significantly with wind conditions in winter. Inclusion of UCPs have a limited impact on air temperature simulations. In term of wind speed simulations, consistent overestimations by UCM and BEP are found in both summer and winter. The overestimation by BEP reduces significantly when UCPs are available, especially on windy days in winter. On the other hand, performance of UCM can degrade over urban areas with canopy parameters. Wind speed biases are found to correlate significantly with UCPs. The accuracy of wind speed simulations by UCM and BEP increases with urban fraction and building surface ratio. This indicates poor model performances over low-density urban areas, which requires enhanced aerodynamic parameterizations to better account for UCPs. This study reveals the limitation of current urban climate simulations and provides guidance for future model developments.
 
Keywords
Urban canopy parameter
Speaker
于淼
中国气象科学研究院

Submission Author
于淼 中国气象科学研究院
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  • Conference Date

    Oct 13

    2021

    to

    Oct 15

    2021

  • Sep 28 2021

    Draft paper submission deadline

  • Oct 08 2021

    Registration deadline

  • Oct 31 2021

    Contribution Submission Deadline

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中国气象学会
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