The impacts of optical properties on radiative forcing due to dust aerosol |
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Authors: | Hong Wang Guangyu Shi Shuyan Li Wei Li Biao Wang Yanbin Huang |
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Affiliation: | 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 |
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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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Keywords: | optical properties dust aerosol radiative forcing |
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