气候变化领域集成服务门户(CCPortal): Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer

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DOI	10.5194/acp-21-13287-2021
	Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer
	Pernov J.B.; Jensen B.; Massling A.; Thomas D.C.; Skov H.
发表日期	2021
ISSN	1680-7316
起始页码	13287
结束页码	13309
卷号	21 期号:17
英文摘要	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 NCoarse 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. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol; air mass; atmospheric pollution; concentration (composition); mercury (element); summer; Arctic; Greenland
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246600
作者单位	Department of Environmental Science, IClimate, Arctic Research Center, Aarhus University, Frederiksborgvej 399, Roskilde, 4000, Denmark
推荐引用方式 GB/T 7714	Pernov J.B.,Jensen B.,Massling A.,et al. Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer[J],2021,21(17).
APA	Pernov J.B.,Jensen B.,Massling A.,Thomas D.C.,&Skov H..(2021).Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17).
MLA	Pernov J.B.,et al."Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021).