A Study on the Particles Density Estimation in Seoul Metropolitan

김신도,; 김창환,; 황의현,

doi:10.5668/jehs.2008.34.2.131

Cited by 8 publications

(2 citation statements)

References 8 publications

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“…The particle size distribution of the resuspended PM sample was compared to that of the original PM sample. We modified the particle size distribution data provided by NIST using atmospheric particle density data and used it as the distribution of the original PM sample ( Kim, Kim & Hwang, 2008 ). The total number of resuspended particles was collected by the detector and averaged by surface type.…”

Section: Methodsmentioning

confidence: 99%

Particulate matter resuspension from simulated urban green floors using a wind tunnel-mounted closed chamber

Seo

Park

Yoo

2023

PeerJ

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Background Green areas are thought to reduce particulate matter (PM) concentrations in urban environments. Plants are the key to PM reduction via various mechanisms, although most mechanisms do not lead to the complete removal of PM. Ultimately, PM falls into the soil via wind and rainfall. However, the fallen PM can re-entrain the atmosphere, which can affect plants capacity to reduce PM. In this study, we simulated an urban green floor and measured the resuspension of PM from the surface using a new experimental system, a wind tunnel-mounted closed chamber. Methods The developed system is capable of quantifying the resuspension rate at the millimeter scale, which is measured by using the 1 mm node chain. This is adequate for simulating in situ green floors, including fallen branches and leaves. This addressed limitations from previous studies which focused on micrometer-scale surfaces. In this study, the surfaces consisted of three types: bare sand soil, broadleaves, and coniferous leaves. The resuspended PM was measured using a light-scattering dust detector. Results The resuspension rate was highest of 14.45×10−4 s−1 on broad-leaved surfaces and lowest on coniferous surfaces of 5.35×10−4 s−1 (p < 0.05) and was not proportional to the millimeter-scale surface roughness measured by the roller chain method. This might be due to the lower roughness density of the broad-leaved surface, which can cause more turbulence for PM resuspension. Moreover, the size distribution of the resuspended PM indicated that the particles tended to agglomerate at 2.5 µm after resuspension. Conclusion Our findings suggest that the management of fallen leaves on the urban green floor is important in controlling PM concentrations and that the coniferous floor is more effective than the broadleaved floor in reducing PM resuspension. Future studies using the new system can be expanded to derive PM management strategies by diversifying the PM types, surfaces, and atmospheric conditions.

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Section: Methodsmentioning

confidence: 99%

Particulate matter resuspension from simulated urban green floors using a wind tunnel-mounted closed chamber

Seo

Park

Yoo

2023

PeerJ

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“…1.85±0.14 (calculated) Dry desert aerosol ⁄2.5 μm 1.56±0.12 (retrieved) Kim et al (2008) 1.92 (winter) Urban aerosol ⁄10 μm 1.64 (spring) 1.57 (fall) Heo et al (1986) 2.2~Metals from soil dust 1.3~2.2 Metals from combustion Pitz et al (2003) 1.6 (1.0~2.5) Urban aerosol 10 nm~2.03 μm Karg (2000) 1 …”

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confidence: 99%

Aerosol Density Determined Using Micro-orifice Uniform Deposit Impactor and Aerosol Dust Monitors Data at Seoul

Kim¹,

Lee²

2010

Journal of Korean Society for Atmospheric Environment

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서 론입자의 AbstractIn order to calculate the aerosol bulk densities of PM 1.0 and PM 10 , aerosol mass and number concentrations were measured for the period of December 2008~April 2009. PM 1.0 and PM 10 mass concentrations were measured using a cascade impactor (Micro-Orifice Uniform Deposit Impactor, MOUDI) while their volume concentrations were calculated based on number concentrations from an environmental dust monitor (EDM). Normal aerosol size distribution fitting functions were retrieved for number size distribution since aerosols ⁄2.5 μm were measured from the EDM. Strong correlation was found between PM 10 mass and volume concentrations obtained with a R 2 of 0.95.The calculated average bulk densities of PM 1.0 and PM 10 were 1.97±0.33 g/cm 3 and 2.15±0.18 g/cm 3 , respectively.

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Development and experimental validation of a physical model for the soiling of mirrors for CSP industry applications

et al. 2018

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A Study on the Particles Density Estimation in Seoul Metropolitan

Cited by 8 publications

References 8 publications

Particulate matter resuspension from simulated urban green floors using a wind tunnel-mounted closed chamber

Particulate matter resuspension from simulated urban green floors using a wind tunnel-mounted closed chamber

Aerosol Density Determined Using Micro-orifice Uniform Deposit Impactor and Aerosol Dust Monitors Data at Seoul

Development and experimental validation of a physical model for the soiling of mirrors for CSP industry applications

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