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

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

doi:https://doi.org/10.5194/gmd-16-5931-2023

Articles | Volume 16, issue 20

https://doi.org/10.5194/gmd-16-5931-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-16-5931-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 20

Model evaluation paper

|

20 Oct 2023

Model evaluation paper |

| 20 Oct 2023

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

Megan A. Stretton, William Morrison, Robin J. Hogan, and Sue Grimmond

Supplement

https://doi.org/10.5194/gmd-16-5931-2023-supplement

Data sets

Data and Code for: Evaluation of vertically resolved longwave radiation in SPARTACUS-Urban and the sensitivity to urban surface temperatures Megan Stretton, William Morrison, Robin Hogan, and Sue Grimmond https://doi.org/10.5281/zenodo.6798640

Model code and software

SPARTACUS-Surface Robin Hogan https://github.com/ecmwf/spartacus-surface

DART Jean Philippe Gastellu-Etchegorry https://dart.omp.eu/

Short summary

Cities' materials and forms impact radiative fluxes. We evaluate the SPARTACUS-Urban multi-layer approach to modelling longwave radiation, describing realistic 3D geometry statistically using the explicit DART (Discrete Anisotropic Radiative Transfer) model. The temperature configurations used are derived from thermal camera observations. SPARTACUS-Urban accurately predicts longwave fluxes, with a low computational time (cf. DART), but has larger errors with sunlit/shaded surface temperatures.