Evaluation of vertically resolved longwave radiation in SPARTACUS-Urban 0.7.3 and the sensitivity to urban surface temperatures

Abstract × < 2.5  % for downwelling fluxes, and < 0.5  % for top-of-canopy upwelling fluxes. Errors are larger (nBE < 8  %) for net longwave fluxes from walls and roofs. Using more realistic surface temperatures, varying depending on surface shading, the nBE in upwelling longwave increases to ∼ 2  %. Errors in roof and wall net longwave fluxes increase through the day, but nBEs are still 8 %–11 %. This increase in nBE occurs because SPARTACUS-Urban represents vertical but not horizontal surface temperature variation within a domain. Additionally, SPARTACUS-Urban outperforms the Harman single-layer canyon approach, particularly in the longwave interception by roofs. We conclude that SPARTACUS-Urban accurately predicts longwave fluxes, requiring less computational time (cf. DART, 2022) but with larger errors when surface temperatures vary due to shading. SPARTACUS-Urban could enhance multi-layer urban energy balance scheme prediction of within-canopy temperatures and fluxes.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Evaluation of vertically resolved longwave radiation in SPARTACUS-Urban 0.7.3 and the sensitivity to urban surface temperatures ; volume:16 ; number:20 ; year:2023 ; pages:5931-5947 ; extent:17 ; Geoscientific model development ; 16, Heft 20 (2023), 5931-5947 (gesamt 17)

Classification and Topics

• Classification: Architektur

Contributors, Places and Time

• Creator: Stretton, Megan A. ; Morrison, William ; Hogan, Robin J. ; Grimmond, Sue

Further information

• DOI: 10.5194/gmd-16-5931-2023
• URN: urn:nbn:de:101:1-2023102604333274241770
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 10:59 AM CEST