气候变化领域集成服务门户(CCPortal): Variability in gaseous elemental mercury at villum research station; Station Nord; in North Greenland from 1999 to 2017

CCPortal

DOI	10.5194/acp-20-13253-2020
	Variability in gaseous elemental mercury at villum research station; Station Nord; in North Greenland from 1999 to 2017
	Skov H.; Hjorth J.; Nordstrøm C.; Jensen B.; Christoffersen C.; Poulsen M.B.; Liisberg J.B.; Beddows D.; Dall'Osto M.; Christensen J.H.
发表日期	2020
ISSN	16807316
起始页码	13253
结束页码	13265
卷号	20 期号:21
英文摘要	Mercury is ubiquitous in the atmosphere, and atmospheric transport is an important source for this element in the Arctic. Measurements of gaseous elemental mercury (GEM) have been carried out at Villum Research Station (Villum) at Station Nord, situated in northern Greenland. The measurements cover the period 1999-2017, with a gap in the data for the period 2003-2008 (for a total of 11 years). The measurements were compared with model results from the Danish Eulerian Hemispheric Model (DEHM) that describes the contribution from direct anthropogenic transport, marine emissions and general background concentration. The percentage of time spent over different surfaces was calculated by back-trajectory analysis, and the reaction kinetics were determined by a comparison with ozone. The GEM measurements were analysed for trends, both seasonal and annual. The only significant trends found were negative ones for the winter and autumn months. Comparison of the measurements to simulations using the Danish Eulerian Hemispheric Model (DEHM) indicated that direct transport of anthropogenic emissions of mercury accounts for between 14 % and 17 % of the measured mercury. Analysis of the kinetics of the observed atmospheric mercury depletion events (AMDEs) confirms the results of a previous study at Villum of the competing reactions of GEM and ozone with Br, which suggests that the lifetime of GEM is about a month. However, a GEM lifetime of 12 months gave the best agreement between the model and measurements. The chemical lifetime is shorter, and thus, the apparent lifetime appears to be the result of deposition followed by reduction and re-emission; for this reason, the term “relaxation time” is preferred to “lifetime” for GEM. The relaxation time for GEM causes a delay between emission reductions and the effect on actual concentrations. No significant annual trend was found for the measured concentrations of GEM over the measurement period, despite emission reductions. This is interesting, and together with low direct transport of GEM to Villum as found by the DEHM model, it shows that the dynamics of GEM are very complex. Therefore, in the coming years, intensive measurement networks are needed to describe the global distribution of mercury in the environment as the use of models to predict future levels will still be highly uncertain. The situation is increasingly complex due to global changes that most likely will change the transport patterns of mercury, not only in the atmosphere but also between matrixes. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
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/143826
作者单位	Department of Environmental Science, iClimate, Aarhus University, Frederiksborgvej 399, Roskilde, 4000, Denmark; Physics of Ice, Climate and Earth, University of Copenhagen, Tagensvej 16, Copenhagen, 2200, Denmark; Centre for Atmospheric Science, Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Institute of Marine Sciences (ICM), Consejo Superior de Investigaciones Científicas (CSIC), Passeig Marítim de la Barceloneta 37-49, Barcelona, 08003, Spain
推荐引用方式 GB/T 7714	Skov H.,Hjorth J.,Nordstrøm C.,et al. Variability in gaseous elemental mercury at villum research station; Station Nord; in North Greenland from 1999 to 2017[J],2020,20(21).
APA	Skov H..,Hjorth J..,Nordstrøm C..,Jensen B..,Christoffersen C..,...&Christensen J.H..(2020).Variability in gaseous elemental mercury at villum research station; Station Nord; in North Greenland from 1999 to 2017.Atmospheric Chemistry and Physics,20(21).
MLA	Skov H.,et al."Variability in gaseous elemental mercury at villum research station; Station Nord; in North Greenland from 1999 to 2017".Atmospheric Chemistry and Physics 20.21(2020).