Detection of internally mixed Asian dust with air pollution aerosols using a polarization optical particle counter and a polarization-sensitive two-wavelength lidar

Sugimoto, Naoki; Nishizawa, Tomoaki; Shimizu, Atsushi; Matsui, Ichiro; Kobayashi, Hiroshi

doi:10.1016/j.jqsrt.2014.08.003

Cited by 62 publications

(49 citation statements)

References 30 publications

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“…Generally, pure dusts near the desert region show larger depolarization ratios while industrial and urban aerosols indicate smaller value. Transported low-altitude dusts may mix with the anthropogenic pollutants thus showing the middle-level depolarization ratio (Sugimoto et al, 2015). Our value of volume depolarization ratio dv ¼ 0.1e0.2 agrees with averages observed in Wuhan, China (30.5 N, 114.4 E, He and Yi, 2015).…”

Section: Asian Dust Optics Properties and Time-height Evolutionsupporting

confidence: 88%

Characterizing a persistent Asian dust transport event: Optical properties and impact on air quality through the ground-based and satellite measurements over Nanjing, China

Han

Wang

et al. 2015

Atmospheric Environment

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Section: Asian Dust Optics Properties and Time-height Evolutionsupporting

confidence: 88%

Characterizing a persistent Asian dust transport event: Optical properties and impact on air quality through the ground-based and satellite measurements over Nanjing, China

Han

Wang

et al. 2015

Atmospheric Environment

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“…Internal mixing of coarse mode dust with fine mode anthropogenic aerosols has been suggested by observations in the Asian Aerosol Characterization Experiment (ACE-Asia) (Seinfeld et al, 2004) and recent studies (Sugimoto et al, 2015;Wang et al, 2017), although the mechanism leading to the mixing has yet to be elucidated. Internal mixing of dust with anthropogenic pollution likely occurs via condensation of low-volatility organic and inorganic compounds, particle-phase reactions, and coagulation with other aerosol types (Zhang et al, 1996;Zhao et al, 2006;Qiu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Radiative absorption enhancement of dust mixed with anthropogenic pollution over East Asia

Tian

Zhang

et al. 2018

Atmos. Chem. Phys.

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Abstract. The particle mixing state plays a significant yet poorly quantified role in aerosol radiative forcing, especially for the mixing of dust (mineral absorbing) and anthropogenic pollution (black carbon absorbing) over East Asia. We have investigated the absorption enhancement of mixed-type aerosols over East Asia by using the Aerosol Robotic Network observations and radiative transfer model calculations. The mixed-type aerosols exhibit significantly enhanced absorbing ability than the corresponding unmixed dust and anthropogenic aerosols, as revealed in the spectral behavior of absorbing aerosol optical depth, single scattering albedo, and imaginary refractive index. The aerosol radiative efficiencies for the dust, mixed-type, and anthropogenic aerosols are −101.0, −112.9, and −98.3 Wm −2 τ −1 at the bottom of the atmosphere (BOA); −42.3, −22.5, and −39.8 Wm −2 τ −1 at the top of the atmosphere (TOA); and 58.7, 90.3, and 58.5 Wm −2 τ −1 in the atmosphere (ATM), respectively. The BOA cooling and ATM heating efficiencies of the mixed-type aerosols are significantly higher than those of the unmixed aerosol types over the East Asia region, resulting in atmospheric stabilization. In addition, the mixed-type aerosols correspond to a lower TOA cooling efficiency, indicating that the cooling effect by the corresponding individual aerosol components is partially counteracted. We conclude that the interaction between dust and anthropogenic pollution not only represents a viable aerosol formation pathway but also results in unfavorable dispersion conditions, both exacerbating the regional air pollution in East Asia. Our results highlight the necessity to accurately account for the mixing state of aerosols in atmospheric models over East Asia in order to better understand the formation mechanism for regional air pollution and to assess its impacts on human health, weather, and climate.

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“…So far, about 10 papers are published using ADNet data [8][9][10]. A study for providing a qualitative index of internal mixing of dust and air pollution particles is being conducted [11].…”

Section: Epidemiology Using Ad-net Datamentioning

confidence: 99%

Recent developments with the asian dust and aerosol lidar observation network (AD-NET)

et al. 2018

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Recent developments of lidars and data analysis methods for AD-Net, and the studies using ADNet are presented. Continuous observation was started in 2001 at three stations using polarizationsensitive Mie-scattering lidars. Currently, lidars, including three multi-wavelength Raman lidars and one high-spectral-resolution lidar, are operated at 20 stations. Recent studies on validation/assimilation of chemical transport models, climatology, and epidemiology of Asian dust are also described.

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Detection of internally mixed Asian dust with air pollution aerosols using a polarization optical particle counter and a polarization-sensitive two-wavelength lidar

Cited by 62 publications

References 30 publications

Characterizing a persistent Asian dust transport event: Optical properties and impact on air quality through the ground-based and satellite measurements over Nanjing, China

Characterizing a persistent Asian dust transport event: Optical properties and impact on air quality through the ground-based and satellite measurements over Nanjing, China

Radiative absorption enhancement of dust mixed with anthropogenic pollution over East Asia

Recent developments with the asian dust and aerosol lidar observation network (AD-NET)

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