Turbulent Diffusion Effect on PM2.5 Concentration above an Urban Canopy

Turbulent diffusion played a role in mixing the pollutants that caused instability in the atmospheric boundary layer by analyzing the features of turbulent transfer, diffusion coefficients of momentum (km) and heat (kh), and the shape of universal functions of PM2.5. Observation of turbulence measur...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2023-08, Vol.1223 (1), p.012005
Main Authors: Redah, Ghadeer A., Al-Jiboori, Monim H., Al-Taai, Osama T.
Format: Article
Language:English
Subjects:
Atmosphere stability
Atmospheric boundary layer
Boundary layer stability
Boundary layers
Contaminants air
Diffusion coefficient
Diffusion layers
Eddy diffusion
Heat
Heat exchange
Momentum
Particulate matter
Stability analysis
Turbulence
Turbulent diffusion
Urban boundary layer
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Summary:Turbulent diffusion played a role in mixing the pollutants that caused instability in the atmospheric boundary layer by analyzing the features of turbulent transfer, diffusion coefficients of momentum (km) and heat (kh), and the shape of universal functions of PM2.5. Observation of turbulence measured by 3D ultrasonic anemometer for one week in both January and July 2016, in Baghdad, Iraq. K and PM2.5 concentrations had a strong inverse relationship under three atmospheric stabilities: unstable, neutral, and stable conditions, this indicated that turbulent diffusion’s impact was significant during the observed period. According to the comparisons between Km and Kh, the strength of the turbulent exchange of PM2.5 concentration at stations may be weaker or stronger than the strength of the turbulent momentum and heat exchange. Finally, the result shows the turbulent diffusion coefficient by heat Kh was larger than the turbulent diffusion coefficient by momentum Km.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1223/1/012005