Volume 9, No. 3, September 2009, Pages 323-331 PDF(885 KB)
Individual Particle Analysis of Atmospheric Aerosols at Nam Co, Tibetan Plateau
Zhiyuan Cong1, Shichang Kang1,2, Shuping Dong3, Yulan Zhang1
1 Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, Beijing 100085, China
2 State Key Laboratory of Cryospheric Science, Chinese Academy of Sciences, Lanzhou 730000, China
3 National Center for Environmental Analysis and Measurements, Beijing 100029, China
Twelve filter samples were sampled monthly during a continuous 1-year campaign at a remote site, Nam Co in central Tibetan Plateau. The total aerosol concentrations ranged from 0.48 μg/m3 to 36.11 μg/m3 with the annual average of 6.74 μg/m3, reflecting a typical background level. The composition and morphology of atmospheric aerosols with size ranging from 0.5 to 10 μm were investigated using a scanning electron microscope coupled with energy dispersive X-ray analysis. Then aerosol particles were classified into 7 groups: soot, tar ball, aluminosilicates/quartz, calcium sulfate, Ca/Mg carbonate, Fe/Ti oxide, and biological particle. Aerosol optical properties from the sun photometer and the results obtained by SEM-EDX could support and verify each other, providing complementary information on aerosol characteristics at Nam Co. Two distinct types of air masses arriving at Nam Co correspond to different aerosol constituent, showing that the summer monsoon circulation may bring considerable pollution from South Asia, while the westerly flow dominated in winter is relative clean.
Aerosols; SEM-EDX; Nam Co; Tibetan Plateau.