22 Apr 2022
22 Apr 2022
Status: this preprint is currently under review for the journal ACP.

Long-term variation study of fine-mode particle size and regional characteristics using AERONET data

Juseon Shin1, Juhyeon Sim1, Naghmeh Dehkhoda1, Sohee Joo1, Taekyung Kim1, Gahyung Kim1, Detlef Müller2, Matthias Tesche3, Sungkyun Shin4, Dongho Shin5, and Youngmin Noh6 Juseon Shin et al.
  • 1Division of Earth Environmental System Science, Pukyong National University, Busan, Republic of Korea
  • 2University of Hertfordshire, United Kingdom
  • 3Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany
  • 4Department of Atmospheric Particulate Matter Research, Seoul Institute of Technology, Seoul, Republic of Korea
  • 5Fine Dust Research Department, Korea Institute of Energy Research, Daejeon, Republic of Korea
  • 6Department of Environmental Engineer, Pukyong National University, Busan, Republic of Korea

Abstract. 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. 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 -2.95 and -2.31, respectively). The change in τPC reflects the reduction of primary emissions from plants and other anthropogenic sources as the result of regulations by air policies. Values of αT decreased by -3.3 to -30.5 % in Europe, North Africa, and the Middle East, which means the mean size of aerosol particles increased. Particle size on average became smaller over India and Asian regions considered in our study. We find that αT increased by 1.3 to 13.1 %. In particular, αPF increased in most areas., showing the probability that the average particle size of fine-mode aerosols became smaller in recent years.

Juseon Shin et al.

Status: open (until 08 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-219', Anonymous Referee #1, 18 May 2022 reply

Juseon Shin et al.

Juseon Shin et al.


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Short summary
We analyzed long-term AERONET sun/sky radiometer for 6 continentals to verify the trend of aerosol physical properties depending on sources (dust or pollution) and size (fine or coarse mode). We identified the trend of classified aerosol optical depth (AOD) and size change over 9 years. Especially, we find out aerosol properties causing AOD variations are different from regions and fine aerosol particle in most regions has become smaller using MK-test for trend analysis.