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Contrasting the size-resolved nature of particulate arsenic, cadmium, and lead among diverse regions
Atmospheric Pollution Research ( IF 4.5 ) Pub Date : 2021-01-05 , DOI: 10.1016/j.apr.2021.01.002
Marisa E. Gonzalez , Connor Stahl , Melliza Templonuevo Cruz , Paola Angela Bañaga , Grace Betito , Rachel A. Braun , Mojtaba Azadi Aghdam , Maria Obiminda Cambaliza , Genevieve Rose Lorenzo , Alexander B. MacDonald , James Bernard Simpas , Janae Csavina , A. Eduardo Sáez , Eric Betterton , Armin Sorooshian

This study examines the mass size distributions and crustal enrichment factors (EFs) of arsenic (As), cadmium (Cd), and lead (Pb) for diverse regions: coastal marine (Marina, California), arid mining facility (Hayden, Arizona), arid urban (Tucson, Arizona), free troposphere (Mt. Lemmon, Arizona), and coastal urban (Manila, Philippines). Micro-orifice uniform deposit impactor (MOUDI) measurements revealed several notable features. All sites showed a bimodal profile with a peak in the submicrometer and supermicrometer diameter range except for Manila, which peculiarly lacked a peak above 1 μm. Enrichment factor analysis revealed contaminated dust at all sites, even the free tropospheric site, with greater contamination in the submicrometer range. The most extensive dataset in Manila allowed for seasonal analysis, which revealed differences among the same species based on seasonally-dependent transport patterns. Sites experiencing biomass burning influence (Manila and Marina) generally exhibited suppressed concentrations and crustal EFs during burning periods presumably because soil emitted from fires is fresh without extensive processing time to become contaminated. These results have important implications for a variety of aerosol effects dependent on aerosol size (e.g., public health, biogeochemical cycling, heterogeneous chemistry) and underscore the importance of accounting for the coarse aerosol mode as more dust emissions are expected in warmer climate scenarios.



中文翻译:

在不同区域中对比砷,镉和铅颗粒的大小分辨性质

这项研究检查了以下地区的砷(As),镉(Cd)和铅(Pb)的质量尺寸分布和地壳富集因子(EFs):沿海海洋(加利福尼亚州玛丽娜),干旱采矿设施(亚利桑那州海登) ,干旱的城市(亚利桑那州的图森),对流层(亚利桑那州的莱蒙山)和沿海城市(菲律宾的马尼拉)。微孔口均匀沉积撞击器(MOUDI)的测量显示了几个显着特征。除马尼拉以外,所有位点均显示双峰分布,其峰在亚微米和超微米直径范围内,而马尼拉例外,该峰缺少1μm以上的峰。富集因子分析显示,所有部位,甚至是自由对流层部位的灰尘均受到污染,亚微米范围内的污染更大。马尼拉最广泛的数据集可以进行季节性分析,根据季节相关的运输方式揭示了同一物种之间的差异。受生物质燃烧影响的地点(马尼拉和滨海地区)通常在燃烧期间表现出抑制的浓度和地壳EF,大概是因为火灾释放的土壤是新鲜的,没有大量的处理时间被污染。这些结果对取决于气溶胶大小的各种气溶胶效应(例如,公共卫生,生物地球化学循环,异质化学)具有重要意义,并强调了考虑粗气溶胶模式的重要性,因为在温暖的气候情景下,预计会有更多的粉尘排放。受生物质燃烧影响的地点(马尼拉和滨海地区)通常在燃烧期间表现出抑制的浓度和地壳EF,大概是因为火灾释放的土壤是新鲜的,没有大量的处理时间被污染。这些结果对取决于气溶胶大小的各种气溶胶效应(例如,公共卫生,生物地球化学循环,异质化学)具有重要意义,并强调了考虑粗气溶胶模式的重要性,因为在温暖的气候情景下,预计会有更多的粉尘排放。受生物质燃烧影响的地点(马尼拉和滨海地区)通常在燃烧期间表现出抑制的浓度和地壳EF,大概是因为火灾释放的土壤是新鲜的,没有大量的处理时间被污染。这些结果对取决于气溶胶大小的各种气溶胶效应(例如,公共卫生,生物地球化学循环,异质化学)具有重要意义,并强调了考虑粗气溶胶模式的重要性,因为在温暖的气候情景下,预计会有更多的粉尘排放。

更新日期:2021-01-06
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