Deposition of atmospheric mercury is of global concern, primarily due to health effects associated with efficient bioaccumulation of mercury in marine food webs. Although oxidation of gaseous elementary mercury (GEM), the major fraction of atmospheric mercury, is a critical stage in regulating atmospheric mercury deposition efficiency, this oxidation is currently not well-characterized, limiting modeling-based assessments of mercury in the environment. Based on a previous study, we hypothesized that the oxidation of GEM is predominantly controlled by multistep bromine- and chlorine-induced oxidation (MBCO) in the remote marine boundary layer (RMBL), and by photochemical smog oxidants, primarily ozone (O 3 ) and hydroxyl radical (OH), in the polluted continental boundary layer (PCBL). To test this hypothesis, we used the following analyses: (i) application of a newly developed criterion to evaluate the gaseous oxidized mercury (GOM)–O 3 association based on pre...

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大气汞的氧化是否通过受污染的大陆边界层和偏远海洋边界层中的不同机制来控制？

大气中汞的沉积是全球关注的问题，主要是由于与海洋食物网中汞的有效生物富集有关的健康影响。尽管大气中汞的主要成分气态元素汞（GEM）的氧化是调节大气中汞沉积效率的关键阶段，但目前尚无法很好地表征这种氧化，从而限制了基于模型的环境汞评估。根据先前的研究，我们假设，GEM的氧化主要受远端海洋边界层（RMBL）中多步溴和氯诱导的氧化（MBCO）以及光化学烟雾氧化剂（主要是臭氧（O 3））的控制。和羟基自由基（OH），位于受污染的大陆边界层（PCBL）中。为了检验该假设，我们使用了以下分析：