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首页> 外文期刊>Anais da Academia Brasileira de Ciencias >Atmospheric particle dry deposition of major ions to the South Atlantic coastal area observed at Baía de Todos os Santos, Brazil
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Atmospheric particle dry deposition of major ions to the South Atlantic coastal area observed at Baía de Todos os Santos, Brazil

机译：在巴西的贝多·托多斯·奥斯·桑托斯观察到主要离子向南大西洋沿岸地区的大气颗粒干沉降

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摘要

The coastal atmosphere adjacent to large urban areas can be strongly affected by the emission of air pollutants, among them, major ions species. In this study, the chemical composition and sources of carboxylates and other water-soluble ions in fine and coarse aerosols as well as estimates of particle dry deposition fluxes were studied at a tropical coastal site affected by an urban environment. The mean concentrations of the total carboxylates were 78 ng m–3 in fine fraction and 81 ng m–3 in coarse fraction of particulate matter (PM). The corresponding values for the total inorganic ions were 2143 ng m–3 and 4880 ng m–3 respectively. Main sources for fine particles were:(i) photochemical formation of carboxylic acids in vapor phase and a posterior gas-to-particle conversion onto sea salt particles; (ii) emissions from anthropic sources with long range transportation processes; and (iii) the interchanging of volatile species among atmospheric phases. In turn, for coarse particles, the predominant sources were: (i)gas-phase species and ab/adsorbed onto pre-existing particles afterwards;(ii) primary emission of coarse particles from anthropogenic sources; and (iii) sea salt spray and/or soil resuspension. Finally, particle dry deposition was a very important mechanism representing air-to-sea fluxes of major species.
机译：邻近大城市地区的沿海大气会受到空气污染物（其中主要离子物种）的排放的强烈影响。在这项研究中，在受城市环境影响的热带沿海地区研究了细气溶胶和粗气溶胶中羧酸根和其他水溶性离子的化学组成和来源，以及颗粒干沉降通量的估算值。总的羧酸盐平均浓度为细颗粒物（PM）细颗粒为78 ng m-3，粗颗粒物为81 ng m-3。总无机离子的相应值分别为2143 ng m-3和4880 ng m-3。细颗粒的主要来源是：（i）气相中光化学形成羧酸和后气-气转化为海盐颗粒; （ii）长期运输过程中来自人为来源的排放; （iii）挥发性物质在大气相之间的交换。反过来，对于粗颗粒而言，主要来源是：（i）气相物质，然后ab /被吸附到预先存在的颗粒上;（ii）来自人为来源的粗颗粒的一次排放; （iii）海盐喷雾和/或土壤悬浮。最后，颗粒干沉降是代表主要物种海气通量的非常重要的机制。

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