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Importance of radiative transfer processes in urban climate models: A study based on the PALM model system 6.0
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SYSNO ASEP 0531794 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Importance of radiative transfer processes in urban climate models: A study based on the PALM model system 6.0 Author(s) Salim, M. (DE)
Schubert, S. (DE)
Resler, Jaroslav (UIVT-O) SAI, RID, ORCID
Krč, Pavel (UIVT-O) SAI, RID, ORCID
Maronga, B. (DE)
Kanani-Sühring, F. (DE)
Sühring, M. (DE)
Schneider, Ch. (DE)Source Title Geoscientific Model Development. - : Copernicus GmbH - ISSN 1991-959X
Roč. 15, č. 1 (2022), s. 145-171Number of pages 27 s. Language eng - English Country DE - Germany Keywords radiative transfer ; radiation interactions ; radiation in urban canopy ; RTM Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences R&D Projects UH0383 GA KHP - The Capital City of Prague (KHP) TO01000219 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Open access Institutional support UIVT-O - RVO:67985807 UT WOS 000740963700001 EID SCOPUS 85122995520 DOI 10.5194/gmd-15-145-2022 Annotation 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 parameterise radiative transfer in microscale building resolving UCMs. To that end, we introduce a stepwise parameterization method to the PALM model 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 radiative transfer processes which have major effects on the radiation budget, such as surface and vegetation interaction with short wave and long wave radiation, and those which have minor effects, such as multiple reflections. 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 highlights those processes which are essentially needed to assure acceptable quality of the flow field. Omitting any of these processes may lead to high uncertainties in the model results. Workplace Institute of Computer Science Contact Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Year of Publishing 2023 Electronic address https://dx.doi.org/10.5194/gmd-15-145-2022
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