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Characterization of Optical Properties of Long-range Transported Asian Dust in NorthEast Asia

동북아시아 지역에서 황사의 중장거리 이동에 따른 광학적 특성 변화 분석

  • Noh, Youngmin (School of Environmental Science & Engineering, Gwangju Institute of Science and Technology) ;
  • Lee, Kwon-Ho (Department of Geoinformatics Engineering, Kyungil University)
  • 노영민 (광주과학기술원 환경공학부) ;
  • 이권호 (경일대학교 공간정보공학과)
  • Received : 2013.04.12
  • Accepted : 2013.04.18
  • Published : 2013.04.30

Abstract

The optical properties of long-range transported Asian dust were studied by the satellite observations and Sun/sky radiometer measurements from the Aerosol Robotic Network(AERONET) in Northeast Asia. The movement of Asian dust from source regions to downwind areas was tracked by the Ozone Monitoring Instrument(OMI) derived aerosol product imagery. The optical properties of Asian dust were classified for geographical locations, which are source regions such as deserts area in Dunhuang and Inner Mongolia, downwind areas such as Yulin and Beijing, and long-range transported regions such as Korea(Anmyon and Gosan) and Japan(Noto). In general, relatively higher aerosol mass loadings with larger aerosol particles at desert regions were found. Aerosol Optical Depth(AOD) decreased significantly in downwind areas and long-range transported areas, which was accompanied by increased Angstrom exponents. This indicates the effects of aerosol mixing with various pollutants during transport of Asian dust plume on aerosol optical properties. Moreover, relatively high Single-Scattering Albedo(SSA) at 440 nm values ranging from 0.90 - 0.96 and increasing tendency of SSA with wavelength were observed at source region. The spectral dependence of SSA decreased during long-range transport.

본 연구는 인공위성과 지상 원격탐사 자료를 이용하여 동북아 지역에서 발생하는 황사현상의 중장거리 이동에 따른 광학적 특성 변화를 분석하였다. 동북아시아 지역의 Aerosol Robotic Network(AERONET)의 선포토미터 관측 지점 중에 황사의 발원지로 Dunhuang과 Inner-Mongolia, 발원지에 근접한 풍하측 지점으로 Yulin과 Beijing, 그리고 장거리 이동 지점으로 한국의 Anmyon과 Gosan, 일본의 Noto, 이렇게 7곳을 선정하여 자료를 분석하였다. 황사의 발생 및 이동 경로를 파악하기 위하여 자외선 원격탐사 기법을 사용하는 인공위성인 Ozone Monitoring Instrument(OMI) 관측자료를 활용하였다. 발원지에서의 단산란알베도는 440 nm에서 0.90에서 0.96 사이의 값으로 높았으나 풍하측이나 장거리 이동 지역에서는 그 값이 감소하였다. 또한, 파장에 따른 단산란알베도 값의 차이는 발원지에서는 높게 나타났으나 이동된 지역에서는 그 차이가 감소하였다. 이러한 장거리 이동에 따른 황사의 광흡수 특성의 변화는 이동 중 탄소입자와 같은 대기 오염물질과의 혼합으로부터 기인하는 것으로 판단된다.

Keywords

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