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The Significant Contribution of Small-Sized and Spherical aerosol Particles to the Decreasing Trend in Total aerosol Optical Depth over Land from 2003 to 2018

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Engineering 2022年第9期16卷 82-92页

作者： Ke Gui Huizheng Che Lei Li Yu Zheng Lei Zhang Hujia Zhao Junting Zhong Wenrui Yao Yuanxin Liang Yaqiang Wang Xiaoye Zhang State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological SciencesBeijing 100081China Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166China

The optical and microphysical properties of aerosols remain one of the greatest uncertainties associated with evaluating the climate forcing attributed to *** the trends in aerosol optical depth(AOD)at global and regional scales have been widely examined,little attention has been paid to the trends in type-dependent AODs related to aerosol particle ***,using the aerosol optical component dataset from the Multi-angle Imaging SpectroRadiometer(MISR)instrument,we investigate decadal-scale trends in total aerosol loading as well as AODs for five aerosol components by particle size and morphology during 2003–2018 over *** between the total AOD(TAOD)trends and type-dependent AOD changes were examined,and the relative contribution of each type-dependent AOD to the overall TAOD trends was *** dividing the TAOD values into four different aerosol pollution levels(APLs)with splits at 0.15,0.40,and 0.80,we further explored the relationships between TAOD changes and interannual variations in the frequency-of-occurrences(FoOs)of these ***-term trends in FoOs in the different APLs show that there was a significant improvement in air quality between 2003 and 2018 in most land areas,except South Asia,corresponding to a shift from lightly polluted to clean ***,the effects of different APLs on TAOD changes are regionally dependent and their extent of correlation varied ***,we observed that the annual mean TAOD has decreased by 0.47%.a^(-1)over land since 2003(Paerosols composed of sulfate,organic matter,and black carbon play a

关键词： AOD MISR aerosol pollution levels aerosol type Particle size and morphology

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