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WRF (v4.0)–SUEWS (v2018c) coupled system: development, evaluation and application

Sun, Ting; Omidvar, Hamidreza; Li, Zhenkun; Zhang, Ning; Huang, Wenjuan; Kotthaus, Simone; Ward, Helen C; ... Grimmond, Sue; + view all (2024) WRF (v4.0)–SUEWS (v2018c) coupled system: development, evaluation and application. Geoscientific Model Development , 17 (1) pp. 91-116. 10.5194/gmd-17-91-2024. Green open access

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Abstract

The process of coupling the Surface Urban Energy and Water Scheme (SUEWS) into the Weather Research and Forecasting (WRF) model is presented, including pre-processing of model parameters to represent spatial variability in surface characteristics. Fluxes and mixed-layer height observations in the southern UK are used to evaluate a 2-week period in each season. Mean absolute errors, based on all periods, are smaller in residential Swindon than central London for turbulent sensible and latent heat fluxes (QH, QE) with greater skill on clear-sky days on both sites (for incoming and outgoing short- and long-wave radiation, QH and QE). Clear-sky seasonality is seen in the model performance: there is better absolute skill for QH and QE in autumn and winter, when there is a higher frequency of clear-sky days, than in spring and summer. As the WRF-modelled incoming short-wave radiation has large errors, we apply a bulk transmissivity derived from local observations to reduce the incoming short-wave radiation input to the land surface scheme – this could correspond to increased presence of aerosols in cities. We use the coupled WRF–SUEWS system to investigate impacts of the anthropogenic heat flux emissions on boundary layer dynamics by comparing areas with contrasting human activities (central–commercial and residential areas) in Greater London – larger anthropogenic heat emissions not only elevate the mixed-layer heights but also lead to a warmer and drier near-surface atmosphere.

Type: Article
Title: WRF (v4.0)–SUEWS (v2018c) coupled system: development, evaluation and application
Open access status: An open access version is available from UCL Discovery
DOI: 10.5194/gmd-17-91-2024
Publisher version: http://dx.doi.org/10.5194/gmd-17-91-2024
Language: English
Additional information: © Author(s) 2024. This work is distributed under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/10185266
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