Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis
Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis
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DOI：
10.5194/acp-22-9389-2022
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发表时间：
2022-07-21
影响因子：
6.3
通讯作者：
Haywood, James
中科院分区：
文献类型：
--
作者：
Dang, Caroline;Segal-Rozenhaimer, Michal;Haywood, James
这项研究描述了在观测云层上方的气溶胶及其相互作用(先知)和云-气溶胶-辐射相互作用和强迫：2017年(CRILEY-2017)活动期间收集的过滤器的单颗粒气溶胶成分。特别是描述了老化的生物质燃烧气溶胶(BBA)及其与海洋边界层的相互作用，以及生物质燃烧(BB)空气对海洋气溶胶的影响。研究发现了BBA受海洋边界层处理影响的证据，以及海盐受BB空气影响的证据。在清洁的海洋空气中以及在自由对流层中受BB影响的空气中观察到了二次氯气溶胶。挥发性较高的有机气溶胶似乎与生物质燃烧羽流的年龄增加有关，光解或氧化可能是明显增加挥发性的一种机制。水处理和与海洋边界层空气的相互作用可能是许多陈年钾盐上存在钠的一种机制。从数量上看，生物质燃烧钾盐和改性海盐是过滤样品上观察最多的颗粒物。最常见的BC涂层是无机盐。这些结果表明，光解、氧化和云处理等大气过程是影响老化BBA的元素组成和形态的关键驱动因素。新鲜的BBA无机盐含量对颗粒吸收水分的能力具有重要作用，可能是水处理和大气老化过程中的关键驱动因素。
This study characterizes single-particle aerosol composition from filters collected during the ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) and CLoud-Aerosol-Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) campaigns. In particular the study describes aged biomass burning aerosol (BBA), its interaction with the marine boundary layer and the influence of biomass burning (BB) air on marine aerosol. The study finds evidence of BBA influenced by marine boundary layer processing as well as sea salt influenced by BB air. Secondary chloride aerosols were observed in clean marine air as well as in BB-influenced air in the free troposphere. Higher-volatility organic aerosol appears to be associated with increased age of biomass burning plumes, and photolysis or oxidation may be a mechanism for the apparent increased volatility. Aqueous processing and interaction with the marine boundary layer air may be a mechanism for the presence of sodium on many aged potassium salts. By number, biomass burning potassium salts and modified sea salts are the most observed particles on filter samples. The most commonly observed BC coatings are inorganic salts. These results suggest that atmospheric processes such as photolysis, oxidation and cloud processing are key drivers in the elemental composition and morphology of aged BBA. Fresh BBA inorganic salt content, as it has an important role in the particles' ability to uptake water, may be a key driver in how aqueous processing and atmospheric aging proceed.