Optical and microphysical properties of severe haze and smoke aerosol measured by integrated remote sensing techniques in Gwangju, Korea

Noh, Youngmin; Müller, Detlef; Shin, Dong-Hwa; Lee, Hanlim; Jung, Jae Seung; Lee, Kwon-Ho; Cribb, Maureen; Li, Zhanqing; Kim, Young Jin

doi:10.1016/j.atmosenv.2008.10.058

Cited by 72 publications

(48 citation statements)

References 53 publications

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“…As wind speeds were slower and RHs were higher (RH = 67%-92%) on haze days than on non-haze days (Table 1), formation of secondary OC particles (probably produced by photochemical smog or photochemical reactions) is favoured. Kang et al (2004) and Noh et al (2009) reported that the fine aerosols responsible for haze formation are mostly secondary OC particles based on the investigation of chemical characteristics of acidic gas pollutants and PM 2.5 during hazy episodes in Seoul, Korea.…”

Section: Particle Typesmentioning

confidence: 99%

Characterisation of individual aerosol particles collected during a haze episode in Incheon, Korea using the quantitative ED-EPMA technique

et al. 2011

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Abstract. A quantitative energy-dispersive electron probe X-ray microanalysis (ED-EPMA), called low-Z particle EPMA, was used to analyse individual aerosol particles collected in Incheon, Korea on 13-18 October 2008 (a typical haze episode occurred from 15 to 18 October). Overall 3600 individual particles in PM 2.5−10 and PM 1.0−2.5 fractions from 12 aerosol samples collected on haze and non-haze days were analysed. The analysed particles were classified, based on their X-ray spectral data together with their secondary electron images. The major particle types included organic carbon (OC), elemental carbon (EC), sea-salt, mineral dust (such as aluminosilicate, SiO 2 , CaCO 3 /CaMgCO 3 , etc.), (NH 4 ) 2 SO 4 /NH 4 HSO 4 -containing, K-containing, Ferich and fly ash particles. Their relative number abundance results showed that OC particles were significantly increased while sea-salts and mineral dust particles were significantly decreased (especially in PM 1.0−2.5 fraction) when haze occurred. For the other particle types (except Fe-rich particles in PM 2.5−10 fraction), there were no significant differences in their relative abundances between haze and non-haze samples. On non-haze days, the nitrate-containing reacted seasalt and mineral dust particles in PM 1.0−2.5 fraction significantly outnumbered the sulfate-containing ones, whereas it was the reverse on haze days, implying that on haze days there were special sources or formation mechanisms for fine aerosol particles (≤2.5 µm in aerodynamic diameter). The emission of air pollutants from motor vehicles and stagnant meteorological conditions, such as low wind speed and high relative humidity, might be responsible for the elevated level of OC particles on haze days.

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Section: Particle Typesmentioning

confidence: 99%

Characterisation of individual aerosol particles collected during a haze episode in Incheon, Korea using the quantitative ED-EPMA technique

et al. 2011

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“…These types of aerosol lidar observations are valuable for spaceborne lidars such as CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) (e.g. Omar et al, 2009), since lidar ratio values for different aerosol types are required for reliable aerosol extinction retrievals. Therefore, this study could be useful for further improving lidar ratio selection-scheme algorithms used in spaceborne lidar missions.…”

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confidence: 99%

Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements

et al. 2016

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Abstract. Optical and microphysical properties of different aerosol types over South Africa measured with a multiwavelength polarization Raman lidar are presented. This study could assist in bridging existing gaps relating to aerosol properties over South Africa, since limited long-term data of this type are available for this region. The observations were performed under the framework of the EUCAARI campaign in Elandsfontein. The multi-wavelength Polly XT Raman lidar system was used to determine vertical profiles of the aerosol optical properties, i.e. extinction and backscatter coefficients, Ångström exponents, lidar ratio and depolarization ratio. The mean microphysical aerosol properties, i.e. effective radius and single-scattering albedo, were retrieved with an advanced inversion algorithm. Clear differences were observed for the intensive optical properties of atmospheric layers of biomass burning and urban/industrial aerosols. Our results reveal a wide range of optical and microphysical parameters for biomass burning aerosols. This indicates probable mixing of biomass burning aerosols with desert dust particles, as well as the possible continuous influence of urban/industrial aerosol load in the region. The lidar ratio at 355 nm, the lidar ratio at 532 nm, the linear particle depolarization ratio at 355 nm and the extinction-related Ångström exponent from 355 to 532 nm were 52 ± 7 sr, 41 ± 13 sr, 0.9 ± 0.4 % and 2.3 ± 0.5, respectively, for urban/industrial aerosols, while these values were 92 ± 10 sr, 75 ± 14 sr, 3.2 ± 1.3 % and 1.7 ± 0.3, respectively, for biomass burning aerosol layers. Biomass burning particles are larger and slightly less absorbing compared to urban/industrial aerosols. The particle effective radius were found to be 0.10 ± 0.03, 0.17 ± 0.04 and 0.13 ± 0.03 µm for urban/industrial, biomass burning, and mixed aerosols, respectively, while the singlescattering albedo at 532 nm was 0.87 ± 0.06, 0.90 ± 0.06, and 0.88 ± 0.07 (at 532 nm), respectively, for these three types of aerosols. Our results were within the same range of previously reported values.

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“…In this respect, many studies have successfully demonstrated the capabilities of MRL for use in the monitoring of aerosols (i.e. Tatarov et al, 2012;Müller et al, 2010;Noh et al, 2009).…”

Section: Instruments and Methodsmentioning

confidence: 99%

Multi-wavelength Raman LIDAR for Use in Determining the Microphysical, Optical, and Radiative Properties of Mixed Aerosols

Lee¹,

Noh²

2015

ajae

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The Multi-wavelength Raman LIDAR (MRL) system was developed to enable a better understanding of the complex properties of aerosols in the atmosphere. In this study, the microphysical, optical, and radiative properties of mixed aerosols were retrieved using the discrete aerosol observation products from the MRL. The dust mixing ratio, which is the proportion of dust particles to the total mixed, was derived using the particle depolarization ratio. It was employed in the retrieval of backscattering and extinction coefficient profiles for dust and non-dust particles. The vertical profiles of aerosol optical properties were then used as input parameters in the inversion algorithm for the retrieval of microphysical parameters including the effective radius, refractive index, and the single scattering albedo (SSA). Those products were successfully applied to an analysis of radiative flux using a radiative transfer model. The relationship between the MRL derived extinction and aerosol radiative forcing (ARF) in short-wavelength was assessed over Gwangju, Korea. The results clearly demonstrate that the MRL-derived extinction profiles are a good surrogate for use in the estimation of optical, microphysical, and radiative properties of aerosols. It is considered that the analytical results shown in this study can be used to provide a better understanding of air quality and the variation of local radiative effects due to aerosols.

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Optical and microphysical properties of severe haze and smoke aerosol measured by integrated remote sensing techniques in Gwangju, Korea

Cited by 72 publications

References 53 publications

Characterisation of individual aerosol particles collected during a haze episode in Incheon, Korea using the quantitative ED-EPMA technique

Characterisation of individual aerosol particles collected during a haze episode in Incheon, Korea using the quantitative ED-EPMA technique

Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements

Multi-wavelength Raman LIDAR for Use in Determining the Microphysical, Optical, and Radiative Properties of Mixed Aerosols

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