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KMID : 0614720040470050453
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Journal of Korean Medical Association
2004 Volume.47 No. 5 p.453 ~ p.464
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Physical and Chemical Characteristics of Asian Dust
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Abstract
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The frequency record of sand storm occurrence in spring season has been renewed continuously along with its intensity and extended duration from the year 2000 to 2002 period. The airborne sand transported from long distance practically reduces visibility and influences atmospheric radiation energy balance. It can further affect the ecological system through the deposition on the earth´s surface while offering the buffer effect to acid substance, because of its alkali content such as calcium. It is known that no chemical reaction proceeds between elemental components contained in transporting particles during sand storm period. The elements originating from soil sources and some cations increased with the occurrence of sand storm. However the elements of anthropogenic origin(Pb, Se and Zn) and anions(NH4´ and N03-) decreased, possibly because of the dilution effect by the strong air flow from westward direction.
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