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Aerosol Optical Properties and Its Radiative Forcing over Yulin, China in 2001 and 2002

Advances in Atmospheric Sciences 2009年第3期26卷 564-576页

作者：车慧正张小曳 Stephane ALFRARO bernadette chatenet Laurent GOMES 赵剑琦 Key Laboratory of Atmospheric Chemistry Centre for Atmosphere Watch and ServicesChinese Academy of Meteorological Sciences China Meteorological AdministrationBeijing 100081 Laboratoire Inter-Universitaire des Systmes Atmosphriques Universit Paris Ⅶ/Paris Ⅻ94010 Crteil Cedex France Centre National de la Recherche Scientifique Meto-France/CNRM/GMEI/MNPCA31057ToulouseFrance State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029

The aerosol optical properties and direct radiative forcing over the Mu Us desert of northern China, acquired through a CE318 sunphotometer of the ground-based Aerosol Robotic Network （AERONET）, are analyzed. The seasonal variations in the aerosol optical properties are examined. The effect of meteorological elements （pressure, temperature, water vapor pressure, relative humidity and wind speed） on the aerosol optical properties is also studied. Then, the sources and optical properties under two different cases, a dust event and a pollution event, are compared. The results show that the high aerosol optical depth （AOD） found in Yulin was mostly attributed to the occurrence of dust events in spring from the Mu Us desert and deserts of West China and Mongolia, as well as the impacts of anthropogenic pollutant particles from the middle part of China in the other seasons. The seasonal variation and the probability distribution of the radiative forcing and the radiative forcing efficiency at the surface and the top of the atmosphere are analyzed and regressed using the linear and Gaussian regression methods.

关键词： aerosol optical properties aerosol radiative forcing Mu Us desert China

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ANALYSIS OF COLUMN-INTEGRATED AEROSOL OPTICAL THICKNESS IN BEIJING FROM AERONET OBSERVATIONS

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China Particuology 2006年第6期4卷 330-335页

作者： Xuehua Fan Hongbin Chen Philippe Goloub Xiang'ao Xia Wenxing Zhang bernadette chatenet LAGEO Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China The Graduate School Chinese Academy of Sciences Beijing China Laboratoire d'Optique Atmosphérique Université des Sciences et Technologies de Lille Villeneuve d'Ascq France Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA) Université Paris Creteil France

Aerosol Optical Thickness （AOT）, water vapor content and derived Angstrom exponent acquired by a CIMEL sun photometer in Beijing are analyzed. Monthly means computed from quality-assured daily means, seasonal trends and inter-annual variations are presented and discussed. Summer has the highest seasonal average AOT at 440 nm （τa440）, Angstrom exponent （α440-870） and water vapor content with the values 0.93, 1.34 and 3.0 cm, respectively. The second highest seasonal average τa440 appears in spring with the largest variation of α440-870 and minimum α440-870 0.99 due to the impact of coarse particles. The minimum seasonal average τa440 （0.44） and water vapor content （0.4 cm） appear in winter. The annual average τa440 , α440-870 and water vapor content for about 4-year observation period are 0.70, 1.19 and 1.4 cm, respectively. All monthly average Angstrom exponents are within 0.8-1.4. which indicates aerosol in Beijing is a very complex mixture of both fine- and coarse-mode particles （from anthropogenic influence and natural mineral dust）.

关键词： AERONET AOT angstrom exponent water vapor content

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