Dry deposition fluxes and size distributions of heavy metals in Seoul, Korea during yellow-sand events

Citation
Sm. Yi et al., Dry deposition fluxes and size distributions of heavy metals in Seoul, Korea during yellow-sand events, AEROS SCI T, 35(1), 2001, pp. 569-576
Citations number
22
Categorie Soggetti
Mechanical Engineering
Journal title
AEROSOL SCIENCE AND TECHNOLOGY
ISSN journal
02786826 → ACNP
Volume
35
Issue
1
Year of publication
2001
Pages
569 - 576
Database
ISI
SICI code
0278-6826(200107)35:1<569:DDFASD>2.0.ZU;2-C
Abstract
Mass and elemental dry deposition fluxes and ambient particle size distribu tions were measured using dry deposition plates and a cascade impactor from March to November 1998 in Seoul, Korea. During the spring sampling period several yellow-sand events characterized by long-range transport from China and Mongolia impacted the area. During these events the mass fluxes were s tatistically the same as during springtime nonyellow-sand events. However, most elemental fluxes were higher. In general, the flux ratios of both crus tal (Al, Ca, Mn) and anthropogenic (Ni, Pb) elements to total mass measured during the daytime yellow-sand events were substantially higher than those measured in spring daytime during nonyellow-sand time periods. During all seasons the average measured daytime fluxes were about two times higher tha n nighttime fluxes. The flux of primarily anthropogenic metals (Cu, Ni, Pb, Zn) and Mn was on average one to two orders of magnitude lower than the fl ux of the crustal metals Al and Ca. As is typically found, two modes, fine (0.1 similar to 1.0 mum) and coarse (1.0 similar to 10.0 mum) were present in the measured size distributions (< 10 <mu>m). The particles in the coars e mode constitute a major portion of the measured mass size distribution du ring the yellow-sand events, possibly due to the long-range transport of th ose particles from China.