Preprints
https://doi.org/10.5194/esd-2021-22
https://doi.org/10.5194/esd-2021-22

  30 Jun 2021

30 Jun 2021

Review status: a revised version of this preprint is currently under review for the journal ESD.

Impact of urbanization on thermal environment of Chengdu-Chongqing Urban Agglomeration under complex terrain

Si Chen1,2, Zhenghui Xie1,2, Jinbo Xie1, Bin Liu3, Binghao Jia1, Peihua Qin1, Longhuan Wang1,2, Yan Wang1,2, and Ruichao Li1,2 Si Chen et al.
  • 1State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3School of Software Engineering, Chengdu University of Information Technology, Chengdu 610225, China

Abstract. Located in the mountainous area of southwest China, the Chengdu-Chongqing Urban Agglomeration (CCUA) was rapidly urbanized in the last four decades, has led to a three-fold urban area expansion, thereby affecting the weather and climate. To investigate the urbanization effects on the thermal environment in the CCUA under the complex terrain, we conducted the simulations using the advanced Weather Research and Forecasting (WRF V4.1.5) model together with the combining land-use scenarios and terrain conditions. We observed that the WRF model reproduces the general synoptic summer weather pattern, particularly for the thermal environment. It was shown that the expansion of the urban area changed the underlying surface's thermal properties, leading to the urban heat island effect, enhanced by the complex terrain further. The simulation with the future scenario shows that the implementation of idealized measures including returning farmland to forests, expanding rivers and lakes can reduce the urban heat island effect and regulate the urban ecosystem. Therefore, the urban planning policy can has potential to provide feasible suggestions to best manage the thermal environment of the future city toward improving the livelihood of the people in the environment.

Si Chen et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esd-2021-22', Anonymous Referee #1, 09 Aug 2021
    • AC1: 'Reply on RC1', Zhenghui Xie, 30 Sep 2021
  • RC2: 'Comment on esd-2021-22', Hideki Takebayashi, 24 Aug 2021
    • AC2: 'Reply on RC2', Zhenghui Xie, 30 Sep 2021
  • RC3: 'Comment on esd-2021-22', Anonymous Referee #3, 30 Sep 2021
    • AC3: 'Reply on RC3', Zhenghui Xie, 01 Oct 2021

Si Chen et al.

Si Chen et al.

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Short summary
This study sheds light on the changes of summer thermal environment in Chengdu Chongqing urban agglomeration due to urban expansion under complex terrain conditions in recent 40 years, using high-resolution simulations with the WRF model. We quantify the influence of single urban expansion factor and single complex terrain factor on urban thermal environment.Under the joint influence of complex terrain and urban expansion, the heat island effect caused by urbanization was enhanced.
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