基于船载走航气溶胶质谱技术的海洋气溶胶研究

发布时间：2018-05-28 05:48

本文选题：海洋气溶胶 + 成分　；参考：《环境科学》2017年07期

【摘要】：利用船载走航单颗粒气溶胶质谱仪(SPAMS)对东南沿海海洋气溶胶进行在线观测,获得了近岸海区大气气溶胶化学组成分布特性,并对气溶胶谱特征及其来源进行分析.结果表明:从近岸到远海,气溶胶的浓度呈下降趋势;在近岸海区气溶胶主要受港口及码头周边的汽车、船舶及燃煤等工业排放源的影响;随着离陆地距离的增加,海源性气溶胶的比重上升;海洋气溶胶在观测范围内呈单峰分布,峰值粒径在0.5μm左右,大多数颗粒主要集中在0.2~0.8μm的粒径段;近岸气溶胶元素碳谱峰强,正谱图中K~+元素具有很强的谱峰,负离子谱中HSO_4~-谱峰信号明显,但缺少NO_3~-和NO_2~-谱峰信号;远海气溶胶中元素碳的谱峰强度明显降低,正谱图中Na~+的谱峰很强,并出现Mg~+、Ca~+和NaCl~+的谱峰信号;负离子谱出现了明显的海洋生物特征气溶胶甲基磺酸MSA~-、CN~-、O~-和HSO_4~-等的谱峰信息.表明该观测海区的气溶胶组成复杂,同时受陆源排放气溶胶和海源气溶胶的影响.
[Abstract]:The marine aerosol mass spectrometer (SPAMS) was used to observe the marine aerosol in the southeast coastal area. The chemical composition of atmospheric aerosol in the near shore area was obtained, and the characteristics of the aerosol spectrum and its source were analyzed. The results showed that the aerosol concentration decreased from shore to sea, and the gas solution in the coastal area was gas soluble. The adhesive is mainly influenced by the industrial emission sources, such as cars, ships and coal, and other industrial emission sources around the port and wharf; with the increase of the distance from the land, the proportion of the marine aerosols increases; the ocean aerosol shows a single peak distribution in the range of observation, the peak particle size is about 0.5 m, and most of the particles are mainly concentrated in the particle size of 0.2~0.8 mu m; The K~+ element has strong spectral peak and the HSO_4~- peak signal is obvious in the negative ion spectrum, but there is a lack of NO_3~- and NO_2~- peak signal. The spectral peak intensity of the elemental carbon in the far sea air sol is obviously reduced. The spectral peak of Na~+ is strong in the positive spectrum, and the peak signal of Mg~+, Ca~ + and NaCl~+ appears, and the negative ion spectrum appears obvious. The spectral peaks of marine bioaerosol MSA~-, CN~-, O~- and HSO_4~-, etc., indicate that the aerosol composition of the observed sea area is complex and is affected by terrestrial aerosols and marine aerosols.
【作者单位】：国家海洋局第三海洋研究所;国家海洋局海洋-大气化学与全球变化重点实验室;暨南大学大气环境安全与污染控制研究所;
【基金】：福建省自然科学基金项目(2015J05024) 国家自然科学基金项目(21106018) 国家海洋局公益性行业科研专项(2004DIB5J178);国家海洋局第三海洋研究所基本科研业务费专项(海三科2014027)
【分类号】：X513

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