While much research has been devoted to the subject of gaseous elemental mercury (GEM) and gaseous oxidized mercury (GOM) in the Arctic spring during atmospheric mercury depletion events, few studies have examined the behavior of GOM in the High Arctic summer. GOM, once deposited and incorporated into the ecosystem, can pose a threat to human and wildlife health, though there remain large uncertainties regarding the transformation, deposition, and assimilation of mercury into the food web. Therefore, to further our understanding of the dynamics of GOM in the High Arctic during the late summer, we performed measurements of GEM and GOM, along with meteorological parameters and atmospheric constituents, and utilized modeled air mass history during two summer campaigns in 2019 and 2020 at Villum Research Station (Villum) in northeastern Greenland. Seven events of enhanced GOM concentrations were identified and investigated in greater detail. In general, the common factors associated with event periods at ground level were higher levels of radiation and lower H₂O mixing ratios, accumulated precipitation, and relative humidity (RH), although none were connected with cold temperatures. Non-event periods at ground level each displayed a different pattern in one or more parameters when compared to event periods. Generally, air masses during event periods for both campaigns were colder and drier, arrived from higher altitudes, and spent more time above the mixed layer and less time in a cloud compared to non-events, although some events deviated from this general pattern. Non-event air masses displayed a different pattern in one or more parameters when compared to event periods, although they were generally warmer and wetter and arrived from lower altitudes with little radiation. Coarse-mode aerosols were hypothesized to provide the heterogenous surface for halogen propagation during some of the events, while for others the source is unknown. While these general patterns were observed for event and non-event periods, analysis of individual events showed more specific origins. Five of the seven events were associated with air masses that experienced similar conditions: transported from the cold, dry, and sunlit free troposphere. However, two events experienced contrasting conditions, with air masses being warm and wet with surface layer contact under little radiation. Two episodes of extremely high levels of N_Coarse and BC, which appear to originate from flaring emissions in Russia, did not contribute to enhanced GOM levels. This work aims to provide a better understanding of the dynamics of GOM during the High Arctic summer.

中文翻译：

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高北极夏季 Villum 研究站气态氧化汞的动力学

虽然很多研究都致力于大气汞消耗事件期间北极春季的气态元素汞 (GEM) 和气态氧化汞 (GOM) 的主题，但很少有研究检查 GOM 在高北极夏季的行为。GOM 一旦沉积并融入生态系统，就会对人类和野生动物的健康构成威胁，尽管在汞向食物网的转化、沉积和同化方面仍然存在很大的不确定性。因此，为了进一步了解夏末高北极地区 GOM 的动态，我们对 GEM 和 GOM 以及气象参数和大气成分进行了测量，并利用了 2019 年和 2020 年两次夏季活动期间模拟的气团历史在格陵兰岛东北部的 Villum 研究站（Villum）。确定并更详细地研究了七个 GOM 浓度升高的事件。一般来说，与地面事件周期相关的共同因素是辐射水平较高，而辐射水平较低。H ₂ O混合比、累积降水和相对湿度 (RH)，尽管这些都与低温无关。与事件周期相比，地平面的非事件周期在一个或多个参数中显示出不同的模式。一般来说，与非事件相比，两个运动的事件期间的气团更冷、更干燥，来自更高的高度，在混合层上停留的时间更长，在云中停留的时间更少，尽管有些事件偏离了这种一般模式。与事件期间相比，非事件气团在一个或多个参数中显示出不同的模式，尽管它们通常更温暖、更潮湿，并且从低海拔到达，辐射很少。假设粗模式气溶胶在某些事件期间为卤素传播提供异质表面，而其他人的来源是未知的。虽然在事件和非事件期间观察到这些一般模式，但对个别事件的分析显示出更具体的起源。七个事件中有五个与经历类似条件的气团有关：从寒冷、干燥和阳光照射的自由对流层传输。然而，两个事件经历了截然不同的条件，气团温暖潮湿，表面层接触很少辐射。两集超高水平 两个事件经历了截然不同的条件，气团温暖潮湿，表面层接触很少辐射。两集超高水平 两个事件经历了截然不同的条件，气团温暖潮湿，表面层接触很少辐射。两集超高水平 N _Coarse和 BC 似乎源于俄罗斯的燃烧排放，但对 GOM 水平的提高没有贡献。这项工作旨在更好地了解高北极夏季 GOM 的动态。