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Volume 23 Issue 3

May  2006

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2006 >  23(3): 431-441

The Impacts of Optical Properties on Radiative Forcing Due to Dust Aerosol

  • 1.

    State Key Laboratory of Severe Weather/Center for Numerical Prediction Research, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmo,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Hainan Meteorology and Ecology Institute, Haikou 570203


doi: 10.1007/s00376-006-0431-5

  • There are large uncertainties in the quantitative assessment of radiative effects due to atmospheric dust aerosol. The optical properties contribute much to those uncertainties. The authors perform several sensitivity experiments to estimate the impacts of optical characteristics on regional radiative forcing in this paper. The experiments involve in refractive indices, single scattering albedo, asymmetry factor and optical depth. An updated dataset of refractive indices representing East Asian dust and the one recommended by the World Meteorology Organization (WMO) are contrastively analyzed and used. A radiative transfer code for solar and thermal infrared radiation with detailed aerosol parameterization is employed. The strongest emphasis is on the refractive indices since other optical parameters strongly depend on it, and the authors found a strong sensitivity of radiative forcing on refractive indices. Studies show stronger scattering, weaker absorption and forward scattering of the East Asian dust particles at solar wavelengths, which leads to higher negative forcing, lower positive forcing and bigger net forcing at the top of the atmosphere (TOA) than that of the WMO dust model. It is also found that the TOA forcings resulting from these two dust models have opposite signs in certain regions, which implies the importance of accurate measurements of optical properties in the quantitative estimation of radiative forcing.
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    • Manuscript History

    Manuscript received: 10 May 2006
    Manuscript revised: 10 May 2006
    通讯作者: 陈斌, bchen63@163.com
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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    The Impacts of Optical Properties on Radiative Forcing Due to Dust Aerosol

    • 1. State Key Laboratory of Severe Weather/Center for Numerical Prediction Research, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmo,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric and Quaternary Geology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Hainan Meteorology and Ecology Institute, Haikou 570203
    • Manuscript received: 2006-05-10
    • Manuscript revised: 2006-05-10

    Abstract: There are large uncertainties in the quantitative assessment of radiative effects due to atmospheric dust aerosol. The optical properties contribute much to those uncertainties. The authors perform several sensitivity experiments to estimate the impacts of optical characteristics on regional radiative forcing in this paper. The experiments involve in refractive indices, single scattering albedo, asymmetry factor and optical depth. An updated dataset of refractive indices representing East Asian dust and the one recommended by the World Meteorology Organization (WMO) are contrastively analyzed and used. A radiative transfer code for solar and thermal infrared radiation with detailed aerosol parameterization is employed. The strongest emphasis is on the refractive indices since other optical parameters strongly depend on it, and the authors found a strong sensitivity of radiative forcing on refractive indices. Studies show stronger scattering, weaker absorption and forward scattering of the East Asian dust particles at solar wavelengths, which leads to higher negative forcing, lower positive forcing and bigger net forcing at the top of the atmosphere (TOA) than that of the WMO dust model. It is also found that the TOA forcings resulting from these two dust models have opposite signs in certain regions, which implies the importance of accurate measurements of optical properties in the quantitative estimation of radiative forcing.

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