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17 October 2023 Influence of inversion on the diffusion of a passive impurity over a heat island with large-scale roughness
Lyudmila I. Kurbatskaya
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Proceedings Volume 12780, 29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 127805G (2023) https://doi.org/10.1117/12.2690383
Event: XXIX International Symposium "Atmospheric and Ocean Optics, Atmospheric Physics", 2023, Moscow, Russian Federation
Abstract
The results of computer simulation for an atmospheric boundary layer (ABL) structure, inversion development and scattering of a passive impurity from a continuous source during a critical meteorological period (weak wind, stable atmospheric stratification) above a thermally heterogeneous surface are presented with condideration for urban roughness phenomenon. The influence of urban roughness is not explicitly resolved, but its effect on the wind and temperature fields is parameterized. The Euler model of atmospheric diffusion is based on a three-parameter RANS turbulence model and includes differential transport equations for the mean concentration and the correlation between turbulent concentration and temperature fluctuations. A completely explicit anisotropic algebraic model of gradient type is formulated for the turbulent impurity flow vector. The numerical simulation results show clearly the penetration of impurity into the inversion layer above the mixed layer and the gravitational propagation of impurity inside this layer.
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Lyudmila I. Kurbatskaya "Influence of inversion on the diffusion of a passive impurity over a heat island with large-scale roughness", Proc. SPIE 12780, 29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 127805G (17 October 2023); https://doi.org/10.1117/12.2690383
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KEYWORDS
Diffusion
Modeling
Data modeling
Heat flux
Contamination
Mathematics
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