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首页> 外文期刊>Aerosol Science and Technology: The Journal of the American Association for Aerosol Research >Dry Deposition Fluxes and Size Distributions of Heavy Metals in Seoul,Korea During Yellow-Sand Events
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Dry Deposition Fluxes and Size Distributions of Heavy Metals in Seoul,Korea During Yellow-Sand Events

机译：黄沙事件期间韩国首尔的干沉积通量和重金属的尺寸分布

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摘要

Mass and elemental dry deposition fluxes and ambient particle size distributions 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 statistically the same as during springtime nonyellow-sand events. However, most elemental fluxes were higher. In general, the flux ratios of both crustal (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 than 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 flux of the crustal metals Al and Ca.As is typically found, two modes, fine (0.1 approx 1.0 #mu#m) and coarse (1.0 approx 10.0 #mu#m) were present in the measured size distributions (<10 #mu#m). The particles in the coarse mode constitute a major portion of the measured mass size distribution during the yellow-sand events, possibly due to the long-range transport of those particles from China.
机译：1998年3月至1998年11月在韩国汉城使用干式沉积板和级联撞击器测量了质量和元素的干式沉积通量和环境粒径分布。在春季采样期间，以中国和蒙古的长途运输为特征的几次黄沙事件影响了该地区。在这些事件中，质量通量在统计上与春季非黄砂事件中的相同。但是，大多数元素通量较高。通常，白天黄沙事件中测得的地壳元素（Al，Ca，Mn和人为元素（Ni，Pb））的通量比均显着高于非黄沙时段春季时测得的通量比。 。在所有季节中，白天测得的平均通量大约是夜间通量的两倍。人为主要金属（Cu，Ni，Pb，Zn）和Mn的通量平均比地壳金属Al和Ca的通量低一到两个数量级。通常发现，两种模式都很好（约0.1在测得的尺寸分布中（<10＃mu＃m）存在粗颗粒（1.0＃mu＃m）和粗颗粒（1.0大约10.0＃mu＃m）。在黄沙事件期间，处于粗模式的颗粒构成了测得的质量尺寸分布的主要部分，这可能是由于这些颗粒从中国进行的远距离运输所致。

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