Simultaneous Detection of Alkylamines in the Surface Ocean and Atmosphere of the Antarctic Sympagic Environment
Simultaneous Detection of Alkylamines in the Surface Ocean and Atmosphere of the Antarctic Sympagic Environment
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DOI：
10.1021/acsearthspacechem.9b00028
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发表时间：
2019-05-01
影响因子：
3.4
通讯作者：
Simo, Rafel
中科院分区：
文献类型：
--
作者：
Dall'Osto, Manuel;Airs, Ruth L.;Simo, Rafel
报道了在南极半岛、南奥克尼和南乔治亚群岛同时采集的海水和大气样品中的烷基胺的测量结果。与无冰的远洋海水相比，渐近海水中一、二和三甲胺(分别为MMA、DMA和TMA)及其前体甘氨酸甜菜碱和胆碱的浓度增加，这表明海冰和受海冰影响的海洋微生物群是这些化合物的主要来源。用单颗粒气溶胶飞行时间质谱仪(ATOFMS)研究了由鼓泡海水样品人工产生的原始海雾气溶胶颗粒；它们的混合状态表明，烷基胺是从溶解的和颗粒状的有机氮库中通过海雾进行气雾化的。尽管有这种明确的与海洋喷雾有关的烷基胺来源，ATOFMS对渐近区域周围气溶胶的分析表明，大多数(75%-89%)的气溶胶烷基胺是二次来源，即在气态-海洋交换后并入气溶胶。这些结果表明，渐近的海水性质是影响从海洋流入边界层的生物气溶胶的烷基胺的来源；在评估南极洲的次生气溶胶形成过程时，应考虑这些有机氮化合物。
Measurements of alkylamines from seawater and atmospheric samples collected simultaneously across the Antarctic Peninsula, South Orkney and South Georgia Islands are reported. Concentrations of mono-, di-, and trimethylamine (MMA, DMA, and TMA, respectively), and their precursors, the quarternary amines glycine betaine and choline, were enhanced in sympagic seawater samples relative to ice-devoid pelagic ones, suggesting the microbiota of sea ice and sea ice-influenced ocean is a major source of these compounds. Primary sea-spray aerosol particles artificially generated by bubbling seawater samples were investigated by aerosol time-of-flight mass spectrometry (ATOFMS) of single particles; their mixing state indicated that alkylamines were aerosolized with sea spray from dissolved and particulate organic nitrogen pools. Despite this unequivocal sea spray-associated source of alkylamines, ATOFMS analyses of ambient aerosols in the sympagic region indicated that the majority (75-89%) of aerosol alkylamines were of secondary origin, that is, incorporated into the aerosol after gaseous air-sea exchange. These findings show that sympagic seawater properties are a source of alkylamines influencing the biogenic aerosol fluxed from the ocean into the boundary layer; these organic nitrogen compounds should be considered when assessing secondary aerosol formation processes in Antarctica.