Characterization and Temporal Variation of Asian Dust Aerosol from a Site in the Northern Chinese Deserts |
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| Authors: | X Y Zhang S L Gong R Arimoto Z X Shen F M Mei D Wang Y Cheng |
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| Institution: | (1) State Key Laboratory of Loess &, Quaternary Geology Institute of Earth Environment, Chinese Academy of Sciences, P.O. Box 17, XiAn, 710075, China;(2) Meteorological Service of Canada, ARQM, 4905 Dufferin Street, Toronto, M3H 5T4, Canada;(3) Carlsbad Environmental Monitoring and Research Center, New Mexico State University, Carlsbad, NM, 88220, U.S.A |
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| Abstract: | Time series for total aerosol mass and the concentrations of nineteen elements, and the mass particle-size distributions of the elements, were determined for samples collected from a site in the northern deserts of China -Zhenbeitai, one of ground sites of the Asia-Pacific Regional Aerosol Characterization Experiment (ACE-Asia). Nine dust storm (DS) events were observed during the spring of 2001, lasting a combined total of twenty-six days. Peak mass loadings greatly exceeded the average (260  g m–3), and higher than average dust-element concentrations and wind speeds were also observed during the three-month study. Material balance calculations showed that  82% mass of the total aerosol particles could be ascribed to Asian dust, of which Al, Ca, Fe, K, Mn, Si and Ti accounted for 7%, 6%, 4%, 2%, 0.1%, 32% and 1% by weight, respectively. Modelcalculated dry deposition velocities for 7 dust-elements during dust storm periods averaged 17 cm s–1 and ranged from 14 to 21 cm s–1. The estimated dry depositiona of Asian dust for the spring of 2001 was 189 g m–2, of which 85% was due to dust storms. Factor analysis indicated that 89% of the dust loading during this period was due to remote or regional transport; 11% to local or background dust. |
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| Keywords: | Asian dust Chinese deserts dust storm elements size distribution |
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