Preprints
https://doi.org/10.5194/gmd-2023-232
https://doi.org/10.5194/gmd-2023-232
Submitted as: development and technical paper
 | 
05 Jan 2024
Submitted as: development and technical paper |  | 05 Jan 2024
Status: this preprint is currently under review for the journal GMD.

An urban module coupled with the Variable Infiltration Capacity model to improve hydrothermal simulations in urban systems

Yibing Wang, Xianhong Xie, Bowen Zhu, Arken Tursun, Fuxiao Jiang, Yao Liu, Dawei Peng, and Buyun Zheng

Abstract. Global urban expansion has altered surface aerodynamics and hydrothermal dynamics, aggravating environmental challenges such as urban heat/dry islands. To identify such environmental responses, various physical models, including urban canyon models (UCMs) and land surface models (LSMs), have been developed to represent surface hydrothermal processes. However, UCMs often treat a city as a unified entity and overlook subcity heterogeneity. LSMs are generally designed for natural land covers and lack the capability to capture urban characteristics. To address these limitations, the aim of this study is to couple an urban module with a sophisticated LSM, i.e., the Variable Infiltration Capacity (VIC) model. This coupled model, i.e., the VIC-urban model, is characterized by its ability to coordinate certain critical urban features, including the urban geometry, radiative interactions, and human impacts. Adopting Beijing as an evaluation site, the VIC-urban model shows higher performance than the original version, with excellent accuracy in simulating sensible heat, latent heat, runoff, and land surface temperature (LST). The absolute error is smaller than 25 % for the sensible heat and latent heat, and smaller than 12 % and 30 % for the LST and runoff, respectively, which indicates that VIC-urban can effectively simulate hydrological and thermal fluxes in urban systems. Sensitivity analysis reveals that the roof emissivity and interception capacity exert the greatest impact on the roof temperature and evaporation, and the height-width ratio exerts the greatest influence on the canyon. Our work introduces a reliable option for large-scale land surface simulations that accounts for urban environments, and is among the first attempts to establish a systematic urban modelling framework of the VIC model. The VIC-urban model enables the analysis of urbanization-induced environmental changes and quantification of environmental variations among different urban configurations. The proposed model can thus offer invaluable insights for urban planners and landscape designers.

Yibing Wang, Xianhong Xie, Bowen Zhu, Arken Tursun, Fuxiao Jiang, Yao Liu, Dawei Peng, and Buyun Zheng

Status: open (until 10 Mar 2024)

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Yibing Wang, Xianhong Xie, Bowen Zhu, Arken Tursun, Fuxiao Jiang, Yao Liu, Dawei Peng, and Buyun Zheng
Yibing Wang, Xianhong Xie, Bowen Zhu, Arken Tursun, Fuxiao Jiang, Yao Liu, Dawei Peng, and Buyun Zheng

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Short summary
Urban expansion intensifies challenges like urban heat/dry islands. To address this, we developed an urban module in a land surface model, named VIC-urban. Tested in Beijing, VIC-urban accurately simulated heat fluxes, runoff, and land surface temperature. Our work provides a reliable tool for large-scale simulations considering urban environment, and pioneers a systematic urban modeling framework within VIC. The model offers crucial insights for urban planners and designers.