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Mineralogical characteristics of soil dust from source regions in northern China

Particuology 2009年第6期7卷 507-512页

作者： Zhenxing Shen Sandrine Caquineau Junji Cao Xiaoye Zhang Yuemei Han Annie Gaudichet laurent gomes Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'an China SKLLQG Institute of Earth Environment Chinese Academy of Sciences Xi'an China Institut de Recherche pour le Developpement 32 av. H. Varagnat 93143 Bondy cedex France LISA UMR-CNRS-7583 61 av. de Gal de Gaulle. 94010 Creteil France Meteo-France/CNRM URA I357 42 av. G. Coriolis 31057 Toulouse cedex France

Mineral compositions of aerosol particles were investigated at four sites （Aksu, Dunhuang, Zhenbeitai, and Tongliao） in desert regions of northern China from March to May in 2001 and 2002 during the intensive field campaign period of ACE-Asia （Aerosol Characterization Experiments-Asia）. The X-ray diffraction （XRD） results show the main minerals for Asian dust are illite, chlorite, kaolinite, quartz, feldspar, calcite, and dolomite. Gypsum, hornblende, and halite are also detected in several samples. Semi-quantitative mineralogical data of aerosol samples show that carbonate content decreases from western to eastern source areas; that is, soil dust collected at western source area sites of Dunhuang and Aksu are enriched with carbonate, while northeastern source area site of Tongliao is associated with low carbonate content. But the spatial distribution of feldspar exhibits a different pattern as compared to carbonate, increasing from the western to the eastern sources. The total clay content is significantly higher （73% in average） at the deposition site of Changwu than those at source areas. Air-mass back trajectory studies for the three dust storm events observed at Changwu, showed that soil dust transport pathways were as expected from carbonate content for the source identification, further demonstrating that carbonate was a useful tracer for eolian dust on regional scale in northern China.

关键词： Soil dust Mineralogical composition Carbonate Tracer

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

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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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