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Size-resolved aerosol ionic composition and secondary formation at Mount Heng in South Central China

机译：中南部衡山的尺寸分辨气溶胶离子组成和二次形成

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摘要

To understand the size-resolved aerosol ionic composition and the factors influencing secondary aerosol formation in the upper boundary layer in South Central China, size-segregated aerosol samples were collected using a micro-orifice uniform deposit impactor (MOUDI) in spring 2009 at the summit of Mount Heng (1269 m asl), followed by subsequent laboratory analyses of 13 inorganic and organic water-soluble ions. During non-dust-storm periods, the average PM_(1.8) concentration was 41.8μg-m~(-3), contributing to 55% of the PM_(10). Sulfates, nitrates, and ammonium, the dominant ions in the fine particles, amounted to 46.8% of the PM_(1.8). Compared with Mount Tai in the North China Plain, the concentrations of both fine and coarse particles and the ions contained therein were substantially lower. When the air masses from Southeast Asia prevailed, intensive biomass burning there led to elevated concentrations of sulfates, nitrates, ammonium, potassium, and chloride in the fine particles at Mount Heng. The air masses originating from the north Gobi brought heavy dust storms that resulted in the remarkable production of sulfates, ammonium, methane sulfonic acid, and oxalates in the coarse particles. Generally, the sulfates were primarily produced in the form of (NH_4)_2SO_4 in the droplet mode via heterogeneous aqueous reactions. Only approximately one-third of the nitrates were distributed in the fine mode, and high humidity facilitated the secondary formation of fine nitrates. The heterogeneous formation of coarse nitrates and ammonium on dry alkaline dust surfaces was found to be less efficient than that on the coarse particles during non-dust-storm periods.
机译：为了解尺寸解析的气溶胶离子组成以及影响华南中上边界层次生烟雾形成的因素，2009年春季在峰会上使用微孔均匀沉积撞击器（MOUDI）收集了尺寸分离的烟雾样品。随后对Heng山（1269 m asl）进行了分析，随后对13种无机和有机水溶性离子进行了实验室分析。在非沙尘暴时期，PM_（1.8）的平均浓度为41.8μg-m〜（-3），占PM_（10）的55％。细颗粒中的主要离子硫酸根，硝酸根和铵离子占PM_（1.8）的46.8％。与华北平原的泰山相比，细颗粒和粗颗粒以及其中所含离子的浓度均大大降低。当东南亚的空气盛行时，那里大量的生物质燃烧导致横山的细颗粒中硫酸盐，硝酸盐，铵，钾和氯化物的浓度升高。来自戈壁北部的空气团带来了严重的沙尘暴，导致在粗颗粒中大量产生了硫酸盐，铵盐，甲烷磺酸和草酸盐。通常，硫酸盐主要通过多相水反应以液滴模式以（NH_4）_2SO_4的形式产生。只有大约三分之一的硝酸盐以精细模式分布，高湿度促进了精细硝酸盐的二次形成。在无沙尘暴时期，在干燥的碱性粉尘表面上形成粗硝酸盐和铵的异质性要比在粗颗粒上形成的效率低。

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  • 来源
    《Frontiers of environmental science & eng》 |2013年第6期|815-826|共12页
  • 作者

    Xinfeng WANG; Wenxing WANG; Likun XUE; Xiaomei GAO; Wei NIE; Yangchun YU; Yang ZHOU; Lingxiao YANG; Qingzhu ZHANG; Tao WANG;

  • 作者单位

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China;

    Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Environment Research Institute, Shandong University, Jinan 250100, China;

    Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China;

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  • 正文语种 eng
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  • 关键词

    aerosol water-soluble ions; size distributions; secondary formation; dust storm; Mount Heng;

    机译：气溶胶水溶性离子;尺寸分布;次要阵型尘暴;横山;

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