Preprints
https://doi.org/10.5194/egusphere-2024-1118
https://doi.org/10.5194/egusphere-2024-1118
24 May 2024
 | 24 May 2024

Coupling the urban canopy model TEB (SURFEXv9.0) with the radiation model SPARTACUS-Urbanv0.6.1 for more realistic urban radiative exchange calculation

Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson

Abstract. The urban canopy model TEB is coupled with the radiation model SPARTACUS-Urban to improve both the urban geometry simplification and radiative transfer calculation. SPARTACUS-Urban assumes that the probability density function of wall-to-wall and ground-to-wall distances follows a decreasing exponential. This matches better the distributions in real cities compared to the infinitely-long street canyon employed by the classical TEB. SPARTACUS-Urban solves the radiative transfer equation using the discrete ordinate method. This allows to take into account physical processes like the interaction of radiation with air in the urban canopy layer, spectral dependency of urban material reflectivities, or specular reflections. Such processes would be more difficult to account for with the radiosity method used by the classical TEB. With SPARTACUS-Urban, the mean radiant temperature, a crucial parameter for outdoor human thermal comfort, can be calculated using the radiative fluxes in vertical and horizontal direction incident on a human body in the urban environment. TEB-SPARTACUS is validated by comparing the solar and terrestrial urban radiation budget observables with those simulated by the Monte-Carlo-based HTRDR-Urban reference model for procedurally-generated urban districts mimicking the Local Climate Zones. An improvement is found for almost all radiative observables and urban morphologies for direct solar, diffuse solar, and terrestrial infrared radiation. TEB-SPARTACUS might therefore lead to more realistic results for building energy consumption, outdoor human thermal comfort, or the urban heat island effect.

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Journal article(s) based on this preprint

24 Jan 2025
Coupling the urban canopy model TEB (SURFEXv9.0) with the radiation model SPARTACUS-Urbanv0.6.1 for more realistic urban radiative exchange calculation
Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson
Geosci. Model Dev., 18, 405–431, https://doi.org/10.5194/gmd-18-405-2025,https://doi.org/10.5194/gmd-18-405-2025, 2025
Short summary
Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1118', Anonymous Referee #1, 30 Aug 2024
  • RC2: 'Comment on egusphere-2024-1118', Anonymous Referee #2, 01 Sep 2024
  • AC1: 'Response to both reviewers comments', Robert Schoetter, 31 Oct 2024

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1118', Anonymous Referee #1, 30 Aug 2024
  • RC2: 'Comment on egusphere-2024-1118', Anonymous Referee #2, 01 Sep 2024
  • AC1: 'Response to both reviewers comments', Robert Schoetter, 31 Oct 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Robert Schoetter on behalf of the Authors (31 Oct 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (04 Nov 2024) by Mohamed Salim
RR by Anonymous Referee #2 (13 Nov 2024)
ED: Publish as is (27 Nov 2024) by Mohamed Salim
AR by Robert Schoetter on behalf of the Authors (27 Nov 2024)  Manuscript 

Journal article(s) based on this preprint

24 Jan 2025
Coupling the urban canopy model TEB (SURFEXv9.0) with the radiation model SPARTACUS-Urbanv0.6.1 for more realistic urban radiative exchange calculation
Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson
Geosci. Model Dev., 18, 405–431, https://doi.org/10.5194/gmd-18-405-2025,https://doi.org/10.5194/gmd-18-405-2025, 2025
Short summary
Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson
Robert Schoetter, Robin James Hogan, Cyril Caliot, and Valéry Masson

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Short summary
Radiation is relevant for the atmospheric impact on humans and infrastructure in cities since it can influence the urban heat island, building energy consumption, and human thermal comfort. A new urban radiation model assuming a more realistic form of urban morphology is coupled with the urban climate model TEB. The coupled model is evaluated using a more detailed radiation model for a variety of urban morphologies and an improvement of the most relevant urban radiation variables is found.