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Korean Meteorological Society (한국기상학회)
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Comparison of light-absorption properties of aerosols observed in East and South Asia

동아시아와 남아시아지역에서 관측된 에어러솔의 광흡수 특성 비교

  • Lee, Hae-Jung (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Sang-Woo (School of Earth and Environmental Sciences, Seoul National University) ;
  • Yoon, Soon-Chang (School of Earth and Environmental Sciences, Seoul National University) ;
  • Lee, Sihye (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Ji-Hyoung (School of Earth and Environmental Sciences, Seoul National University)
  • 이혜정 (서울대학교 지구환경과학부) ;
  • 김상우 (서울대학교 지구환경과학부) ;
  • 윤순창 (서울대학교 지구환경과학부) ;
  • 이시혜 (서울대학교 지구환경과학부) ;
  • 김지형 (서울대학교 지구환경과학부)
  • Received : 2011.06.28
  • Accepted : 2011.08.12
  • Published : 2011.09.30
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Abstract

In this study, we compared light-absorption properties of aerosols observed in East and South Asia from black carbon (BC) mass concentration, aerosol scattering (${\sigma}_s$) and absorption (${\sigma}_a$) coefficients measurements at four sites: Korea Climate Observatory-Gosan (KCO-G), Korea Climate Observatory-Anmyeon (KCO-A), Maldives Climate Observatory-Hanimaadhoo (MCO-H) and Nepal Climate Observatory-Pyramid (NCO-P). No significant seasonal variations of BC mass concentration, ${\sigma}_s$ and ${\sigma}_a$, despite of wet removal of aerosols by precipitation in summer, were observed in East Asia, whereas dramatic changes of light-absorbing aerosol properties were observed in South Asia between dry and wet monsoon periods. Although BC mass concentration in East Asia is generally higher than that observed in South Asia, BC mass concentration at MCO-H during winter dry monsoon is similar to that of East Asia. The observed solar absorption efficiency (${\alpha}$) at 550 nm, where ${\alpha}={\sigma}_a/({\sigma}_s+{\sigma}_a)$, at KCO-G and KCO-A is higher than that in MCO-H due to large portions of BC emission from fossil fuel combustion. Interestingly, ${\alpha}$ at NCO-P is 0.14, which is two times great than that in MCO-H and is about 40% higher than that in East Asia, though BC mass concentration at NCO-P is the lowest among four sites. Consistently, the highest elemental carbon to sulphate ratio is found at NCO-P.

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References

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