Long-Term Variation of Black Carbon Absorption Aerosol Optical Depth from AERONET Data over East Asia

Dehkhoda, Naghmeh; Noh, Youngmin; Joo, Sohee

doi:10.3390/rs12213551

Cited by 10 publications

(2 citation statements)

References 76 publications

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“…The LOW fraction was lowest in summer. Similarly, the mean AOD 440 in Osaka was highest in summer (0.64 ± 0.21) during 2001-2018 (Dehkhoda et al, 2020). The BC fraction was highest in summer (23.1%), although this was approximately 15% lower than the levels at all other sites.…”

Section: Seasonal Characteristicsmentioning

confidence: 83%

Long-term variation of aerosol optical properties associated with aerosol types over East Asia using AERONET and satellite (VIIRS, OMI) data (2012–2019)

Eom

Kim²,

Lee³

et al. 2022

Atmospheric Research

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Section: Seasonal Characteristicsmentioning

confidence: 83%

Long-term variation of aerosol optical properties associated with aerosol types over East Asia using AERONET and satellite (VIIRS, OMI) data (2012–2019)

Eom

Kim²,

Lee³

et al. 2022

Atmospheric Research

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“…Many studies show that aerosol mass concentration and aerosol optical depth (AOD, τ) have decreased globally in recent years [9][10][11]13,15,29,30]. However, these changes vary by region.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Variation Study of Fine-Mode Particle Size and Regional Characteristics Using AERONET Data

et al. 2022

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To identify the long-term trend of particle size variation, we analyzed aerosol optical depth (AOD, τ) separated as dust (τD) and coarse-(τPC) and fine-pollution particles (τPF) depending on emission sources and size. Ångström exponent values are also identified separately as total and fine-mode particles (αT and αPF). We checked these trends in various ways; (1) first-order linear regression analysis of the annual average values, (2) percent variation using the slope of linear regression method, and (3) a reliability analysis using the Mann–Kendall (MK) test. We selected 17 AERONET sun/sky radiometer sites classified into six regions, i.e., Europe, North Africa, the Middle East, India, Southeast Asia, and Northeast Asia. Although there were regional differences, τ decreased in Europe and Asian regions and increased in the Middle East, India, and North Africa. Values of τPC and τPF, show that aerosol loading caused by non-dust aerosols decreased in Europe and Asia and increased in India. In particular, τPF considerably decreased in Europe and Northeast Asia (95% confidential levels in MK-test), and τPC decreased in Northeast Asia (Z-values for Seoul and Osaka are −2.955 and −2.306, respectively, statistically significant if |z| ≥ 1.96). The decrease in τPC seems to be because of the reduction of primary and anthropogenic emissions from regulation by air quality policies. The meaningful result in this paper is that the particle size became smaller, as seen by values of αT that decreased by −3.30 to −30.47% in Europe, North Africa, and the Middle East because αT provides information on the particle size. Particle size on average became smaller over India and Asian regions considered in our study due to the decrease in coarse particles. In particular, an increase of αPF in most areas shows the probability that the average particle size of fine-mode aerosols became smaller in recent years. We presumed the cause of the increase in αT is because relatively large-sized fine-mode particles were eliminated due to air quality policies.

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Region-oriented simultaneously joint two-pollutant control strategies are required to substantially reduce deaths attributed to both PM2.5 and ozone pollution in China

Chen,

Zhong,

Hamm

et al. 2024

Atmospheric Environment

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Long-Term Variation of Black Carbon Absorption Aerosol Optical Depth from AERONET Data over East Asia

Cited by 10 publications

References 76 publications

Long-term variation of aerosol optical properties associated with aerosol types over East Asia using AERONET and satellite (VIIRS, OMI) data (2012–2019)

Long-term variation of aerosol optical properties associated with aerosol types over East Asia using AERONET and satellite (VIIRS, OMI) data (2012–2019)

Long-Term Variation Study of Fine-Mode Particle Size and Regional Characteristics Using AERONET Data

Region-oriented simultaneously joint two-pollutant control strategies are required to substantially reduce deaths attributed to both PM2.5 and ozone pollution in China

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