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Challenges of high-fidelity air quality modeling in urban environments – PALM sensitivity study during stable conditions
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SYSNO ASEP 0585707 Document Type V - Research Report R&D Document Type V - Research Report Title Challenges of high-fidelity air quality modeling in urban environments – PALM sensitivity study during stable conditions Author(s) Resler, Jaroslav (UIVT-O) SAI, RID, ORCID
Bauerová, P. (CZ)
Belda, M. (CZ)
Bureš, Martin (UIVT-O) SAI, ORCID
Eben, Kryštof (UIVT-O) SAI, RID, ORCID
Fuka, V. (CZ)
Geletič, Jan (UIVT-O) RID, ORCID, SAI
Jareš, R. (CZ)
Karel, J. (CZ)
Keder, J. (CZ)
Krč, Pavel (UIVT-O) SAI, RID, ORCID
Patiño, W. (CZ)
Radović, J. (CZ)
Řezníček, Hynek (UIVT-O) ORCID, SAI, RID
Sühring, M. (DE)
Šindelářová, A. (CZ)
Vlček, O. (CZ)Issue data München: Europen Geosciences Union, 2024 Series EGUsphere Preprints Series number 2024-1231 Number of pages 35 s. Publication form Online - E Language eng - English Country DE - Germany Keywords large-eddy simulation ; PALM ; urban climate ; air quality ; ventilation ; sensitivity OECD category Meteorology and atmospheric sciences R&D Projects TO01000219 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Research Infrastructure e-INFRA CZ II - 90254 - CESNET, zájmové sdružení právnických osob Institutional support UIVT-O - RVO:67985807 Annotation The urban air quality is an important part of human well-being and its detailed and precise modeling is important for efficient urban planning. In this study the potential sources of errors in LES runs of the PALM model in stable conditions for a high-traffic residential area in Prague, Czech Republic with focus to street canyon ventilation are investigated. The evaluation of the PALM model simulations against observations obtained during a dedicated campaign revealed unrealistically high concentrations of modeled air pollutants for a short period during a winter inversion episode. To identify potential reasons, the sensitivities of the model to changes of meteorological boundary conditions and adjustments of model parameters were tested. The model adaptations included adding the anthropogenic heat from cars, setting a bottom limit of the subgrid-scale TKE, adjusting the profiles of parameters of the Synthetic Turbulence Generator in PALM and limiting the model time step. The study confirmed the crucial role of the correct meteorological boundary conditions for realistic air quality modeling during stable conditions. Besides this, the studied adjustments of the model parameters proved to have a significant impact in these stable conditions, resulting in a decrease of concentration overestimation in range 30–66 % while exhibiting negligible influence on model results during the rest of the episode. This suggested that the inclusion or improvement of these processes in PALM is desirable despite their negligible impact in most other conditions. Moreover, the time step limitation test revealed numerical inaccuracies caused by discretization errors which occurred during such extremely stable conditions. Workplace Institute of Computer Science Contact Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Year of Publishing 2025 Electronic address https://doi.org/10.5194/egusphere-2024-1231
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