Seasonal dependency of the atmospheric oxidizing capacity of the marine boundary layer of Bermuda
Seasonal dependency of the atmospheric oxidizing capacity of the marine boundary layer of Bermuda
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DOI：
10.1016/j.atmosenv.2022.119326
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发表时间：
2022-08
影响因子：
5
通讯作者：
Y. Elshorbany;Yuting Zhu;Youfeng Wang;Xianliang Zhou;Summer Sanderfield;C. Ye;M. Hayden;A. Peters
中科院分区：
文献类型：
--
作者：
Y. Elshorbany;Yuting Zhu;Youfeng Wang;Xianliang Zhou;Summer Sanderfield;C. Ye;M. Hayden;A. Peters
在这项研究中，我们调查了2019年春季和夏季在百慕大都铎山海洋大气观测站进行的两次测量活动中海洋边界层的大气氧化能力。测量的物种包括非甲烷碳氢化合物（NMHCs），HONO，HNO 3，颗粒物，颗粒硝酸盐，NO，NO2，O3，以及气象参数。所有物种的实测浓度一般在春季高于夏季。在春季和夏季，OH起始源分别占白天总OH产生率（POH）的61%和42%。与夏季相比，春季臭氧光解产生的NMHCs和OH水平较高，导致NMHCs的氧化速率较高。但春、夏季NO含量低，导致RO 2和HO 2向OH的再循环效率低，其中HO 2与NO的反应仅占POH的22%和42%。敏感性分析表明，在MBL的OH反应性可以潜在地增强由海洋源，而不是二次氧化产物。包括卤素的一氧化物，溴和IO被发现减少HO 2的14%和18%，分别在春季和夏季，由于气溶胶吸收的损失较高，对OH的边际影响。结果表明，复杂的多相HOx-卤素化学，并呼吁更全面的多相调查。
In this study, we investigate the atmospheric oxidation capacity in the marine boundary layer during two measurement campaigns in spring and summer 2019 at the Tudor Hill Marine Atmospheric Observatory, Bermuda. Measured species included non-methane hydrocarbons (NMHCs), HONO, HNO3, particulate matter, particulate nitrates, NO, NO2, O3, in addition to the meteorological parameters. Measured concentrations of all species were generally higher in spring than in summer. During the spring and summer, OH initiation sources made 61% and 42% of the total OH production rate (POH) during the daytime, respectively. The higher levels of NMHCs and OH production from ozone photolysis lead to a higher oxidation rate of NMHCs in the spring compared to summer. However, the low NO in the spring and summer leads to inefficient recycling of RO2and HO2to OH, with HO2reaction with NO accounting for only 22% and 42% of POHduring spring and summer. Sensitivity analysis suggests that OH reactivity in the MBL can be potentially enhanced by an oceanic source rather than a secondary oxidation product. Including halogen monoxides, BrO and IO were found to decrease HO2by ∼14 and 18% during spring and summer, respectively, with marginal impact on OH due to the higher loss by aerosol uptake. The results demonstrate the complex multiphase HOx-Halogen chemistry and call for a more comprehensive multiphase investigation.