Importance of radiative transfer processes in urban climate models: a study based on the PALM 6.0 model system
-
Published:2022-01-10
Issue:1
Volume:15
Page:145-171
-
ISSN:1991-9603
-
Container-title:Geoscientific Model Development
-
language:en
-
Short-container-title:Geosci. Model Dev.
Author:
Salim Mohamed H.ORCID, Schubert SebastianORCID, Resler JaroslavORCID, Krč PavelORCID, Maronga Björn, Kanani-Sühring Farah, Sühring Matthias, Schneider ChristophORCID
Abstract
Abstract. Including radiative transfer processes within the urban canopy layer into microscale urban climate models (UCMs) is essential to obtain realistic model results. These processes include the interaction of buildings and vegetation with shortwave and longwave radiation, thermal emission, and radiation reflections. They contribute differently to the radiation budget of urban surfaces. Each process requires different computational resources and physical data for the urban elements. This study investigates how much detail modellers should include to parameterize radiative transfer in microscale building-resolving UCMs. To that end, we introduce a stepwise parameterization method to the Parallelized Large-eddy Simulation Model (PALM) system 6.0 to quantify individually the effects of the main radiative transfer processes on the radiation budget and on the flow field. We quantify numerical simulations of both simple and realistic urban configurations to identify the major and the minor effects of radiative transfer processes on the radiation budget. The study shows that processes such as surface and vegetation interaction with shortwave and longwave radiation will have major effects, while a process such as multiple reflections will have minor effects. The study also shows that radiative transfer processes within the canopy layer implicitly affect the incoming radiation since the radiative transfer model is coupled to the radiation model. The flow field changes considerably in response to the radiative transfer processes included in the model. The study identified those processes which are essentially needed to assure acceptable quality of the flow field. These processes are receiving radiation from atmosphere based on the sky-view factors, interaction of urban vegetation with radiation, radiative transfer among urban surfaces, and considering at least single reflection of radiation. Omitting any of these processes may lead to high uncertainties in the model results.
Funder
Technology Agency of the Czech Republic Norway Grants
Publisher
Copernicus GmbH
Reference52 articles.
1. Arakawa, A. and Lamb, V. R.: Computational Design of the Basic Dynamical Processes of the UCLA General Circulation Model, in: Methods in Computational Physics: Advances in Research and Applications, Elsevier, Los Angeles, California, USA,, 173–265, https://doi.org/10.1016/b978-0-12-460817-7.50009-4, 1977. a 2. Archambeau, F., Méchitoua, N., and Sakiz, M.: Code Saturne: A Finite
Volume Code for the computation of turbulent incompressible flows –
Industrial Applications, International Journal on Finite Volumes, 1, Institut de Mathématiques de Marseille, Aix-Marseille Université, France, available at: https://hal.archives-ouvertes.fr/hal-01115371 (last access: 27 December 2021), 2004. a, b, c 3. Bottillo, S., Vollaro, A. D. L., Galli, G., and Vallati, A.: CFD modeling of
the impact of solar radiation in a tridimensional urban canyon at different
wind conditions, Sol. Energy, 102, 212–222, 2014. a, b 4. Clough, S., Shephard, M., Mlawer, E., Delamere, J., Iacono, M., Cady-Pereira,
K., Boukabara, S., and Brown, P.: Atmospheric radiative transfer modeling: a
summary of the AER codes, J. Quant. Spectrosc. Ra., 91, 233–244, 2005. a 5. Crank, P. J., Sailor, D. J., Ban-Weiss, G., and Taleghani, M.: Evaluating the
ENVI-met microscale model for suitability in analysis of targeted urban
heat mitigation strategies, Urban Climate, 26, 188–197,
https://doi.org/10.1016/j.uclim.2018.09.002, 2018. a
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|