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首页> 外文期刊>Atmospheric environment >Water-soluble part of the aerosol in the dust storm season—evidence of the mixing between mineral and pollution aerosols
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Water-soluble part of the aerosol in the dust storm season—evidence of the mixing between mineral and pollution aerosols

机译：沙尘暴季节气溶胶的水溶性部分-矿物和污染气溶胶混合的证据

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摘要

Six dust episodes were observed in Beijing in 2002. Both TSP (Total Suspended Particulate, particle size smaller than 100 μm) and PM_(2.5) (particle size smaller than 2.5 μm) aerosol samples in these episodes were collected and their characteristics of water-soluble part were elaborated in demonstrating the mixing of mineral aerosol with pollution aerosol in the long-range transport of Asia aerosols with various sources and different paths. The dust storm peaked on 20 March, in which the highest concentrations of TSP and PM_(2.5) were 10.9 and 1.4 mg m~(-3), respectively. The mass fraction of water-soluble part generally decreased with the increase of dust intensity. SO_4~(2-) contributed 38-70% to the total anions and Ca~(2+) contributed 37-80% to the total cations, indicating that SO_4~(2-) and Ca~(2+) were the most abundant anion and cation, respectively. The major ions of the water-soluble parts could be classified into three groups, i.e., the crust ions (Ca~(2+), Na~+, and Mg~(2+) ), the pollution-crust ions (SO_4~(2-), Cl~-, and K~+), and the pollution ions (NO_3~-, NH_4~+, NO_2~-, and F~-). Crust ions and pollution ions were the main ion fractions in super dust and non-dust days, respectively, whereas the pollution-crust ions were the main ion fractions in both dust days of various dust intensity and non-dust days, which demonstrated clearly that the mixing between mineral and pollution aerosols was ubiquitous during the dust seasons (even in the super dust storm days) although it was more obvious in those normal and weak dust episodes. The main chemical species of the water-soluble part of the aerosols were CaCO_3 in the super dust storm, CaSO_4 in the normal and the weak dust events, and NH_4NO_3 in the non-dust event days. The secondary transformation of sulfate and nitrate occurred on dust particles both during and after dust days provided the strong evidence of the mixing between mineral and pollution aerosols during the long-range transport of dust.
机译：2002年在北京观测到了6次粉尘事件。收集了这些事件中的TSP（总悬浮颗粒，粒径小于100μm）和PM_（2.5）（粒径小于2.5μm）气溶胶样品，并分析了它们的水-详细阐述了可溶部分，以证明在不同来源和不同途径的亚洲气溶胶的远距离运输中矿物气溶胶与污染气溶胶的混合。沙尘暴在3月20日达到高峰，TSP和PM_（2.5）的最高浓度分别为10.9和1.4 mg m〜（-3）。水溶性部分的质量分数通常随着粉尘强度的增加而降低。 SO_4〜（2-）占总阴离子的38-70％，Ca〜（2+）占总阳离子的37-80％，表明SO_4〜（2-）和Ca〜（2+）最多分别含有丰富的阴离子和阳离子。水溶性部分的主要离子可分为三类：地壳离子（Ca〜（2 +），Na〜+和Mg〜（2+）），污染地壳离子（SO_4〜 （2-），Cl〜-和K〜+），以及污染离子（NO_3〜-，NH_4〜+，NO_2〜-和F〜-）。地壳离子和污染离子分别是超尘天和无尘天的主要离子分数，而污染壳离子是各种尘埃强度和无尘天的主要尘埃离子分数。在沙尘季节（即使是在超级沙尘暴天），矿物质和污染气溶胶之间的混合是普遍存在的，尽管在那些正常和微弱的沙尘事件中更为明显。气溶胶水溶性部分的主要化学物质是超级沙尘暴中的CaCO_3，正常和弱尘事件中的CaSO_4，以及非尘埃事件日中的NH_4NO_3。在粉尘天期间和之后，粉尘颗粒上都会发生硫酸盐和硝酸盐的二次转化，这提供了有力的证据，证明了粉尘在远距离迁移过程中矿物气溶胶和污染气溶胶之间的混合。

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