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首页> 外文期刊>Atmospheric research >Elucidating the sources and dynamics of PM_(10) aerosols in Cienfuegos (Cuba) using their multi-stable and radioactive isotope and ion compositions
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Elucidating the sources and dynamics of PM_(10) aerosols in Cienfuegos (Cuba) using their multi-stable and radioactive isotope and ion compositions

机译：利用其多稳态和放射性同位素和离子组合物阐明CienfueGos（古巴）中PM_（10）气溶胶的来源和动力学

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摘要

In this study, PMic, aerosol samples were collected at 4 urban and 1 rural sites in the region of Cienfuegos (Cuba) and analyzed for their chemical compositions (total carbon (TC), total nitrogen (TN), NH4+, Cl-, NO3- and SO42-) and their stable carbon (delta C-13) and nitrogen (delta N-15), and radioactive (Pb-210, Be-7, Cs-137 and K-40) isotope systematics, in order to better constrain both their sources of pollution and their atmospheric dynamics. The average PMic, concentrations varied from 21.67 +/- 8.54 mu g.m(-3) at the rural site to 39.01 +/- 8.23 mu g m(-3) at an urban site characterized by high road traffic. Chemical compositions showed low variability and similar abundances of the ionic species, but we observed strong correlations between i) NH4+ and SO42- that indicates the formation of secondary ammonium bisulfate (NH4HSO4), and ii) between PM10, and TC highlighting the significant influence of carbonaceous aerosols. We are reporting here the first Pb-210 aerosol concentrations in this region and demonstrate that, coupled with the corresponding Be-7 concentrations, they allow characterizing the dynamics of the regional continental air masses. delta C-13 values in PM10, appear to be controlled by i) emissions from different types of combustion sources, including fossil fuel and biomass burning and ii) carbonate inputs from the industrial activities located around the limestone quarries, east of the city. delta N-15 values presented large isotope variations that can be explained by kinetic processes and the exchange between gas (NH3) and particle (NH4+) phases during the formation of secondary NH4HSO4, a reaction that was enhanced as Cl- concentrations decreased, revealing the preponderant role of local emissions in the budget of the aerosol nitrogen. This study confirms that isotope analysis is reliable for tracing the origin of aerosols and highlight the importance of a multi-isotope approach.
机译：在本研究中，PMIC，在Cienfuegos（古巴）区域的4个城市和1个农村地点收集了PMIC，分析了它们的化学成分（总碳（TC），总氮（TN），NH4 +，CL-，NO3 - 和SO42-）及其稳定的碳（Delta C-13）和氮（Delta N-15）和放射性（PB-210，BE-7，CS-137和K-40）同位素系统，以便更好约束他们的污染源及其大气动力学。平均PMIC，浓度在农村遗址的21.67 +/- 8.54亩，在城市遗址的39.01 +/- 8.23 mm g m（-3），其特征在于高道路交通。化学组合物显示出低变异性和相似的离子物质丰度，但我们观察到I）NH 4 +和SO42之间的强相关性，表明PM10和TC在PM10之间形成二硫酸铵（NH4HSO4）和II）的形成碳质气溶胶。我们在此报告该区域的第一个PB-210气溶胶浓度并证明，与相应的BE-7浓度相结合，它们允许表征区域大陆空气群众的动态。 PM10中的Delta C-13值似乎是I）来自不同类型的燃烧来源的排放，包括化石燃料和生物量燃烧，II）来自城市以东的石灰石采石场周围的工业活动的碳酸盐投入。 ΔN-15值呈现大同位素变化，可以通过动力学方法和气体（NH 3）和颗粒（NH 4）和颗粒（NH 4 +）相的交换来解释，所述仲乳NH4HSO4形成，随着CL-浓度的增加而增强，揭示了地方排放在气溶胶氮预算中的优势作用。本研究证实，同位素分析可靠地追踪气溶胶的起源，并突出多同位素方法的重要性。

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