气候变化领域集成服务门户(CCPortal): Mercury in precipitated and surface snow at Dome C and a first estimate of mercury depositional fluxes during the Austral summer on the high Antarctic plateau

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DOI	10.1016/j.atmosenv.2021.118634
	Mercury in precipitated and surface snow at Dome C and a first estimate of mercury depositional fluxes during the Austral summer on the high Antarctic plateau
	Cairns W.R.; Turetta C.; Maffezzoli N.; Magand O.; Araujo B.F.; Angot H.; Segato D.; Cristofanelli P.; Sprovieri F.; Scarchilli C.; Grigioni P.; Ciardini V.; Barbante C.; Dommergue A.; Spolaor A.
发表日期	2021
ISSN	1352-2310
卷号	262
英文摘要	The role of deposition fluxes on the mercury cycle at Concordia station, on the high Antarctic plateau have been investigated over the Austral summer between December 2017 to January 2018. Wet/frozen deposition was collected daily from specially sited tables, simultaneously with the collection of surface (0–3 cm) and subsurface (3–6 cm) snow and the analysis of Hg0 in the ambient air. Over the course of the experiment the atmospheric Hg0 concentrations ranged from 0.58 ± 0.19 to 1.00 ± 0.33 ng m−3, surface snow Hg concentrations varied between (0–3 cm) 0.006 ± 0.003 to 0.001 ± 0.001 ng cm−3 and subsurface snow (3–6 cm) concentrations varied between 0.001 ± 0.001 to 0.003 ± 0.002 ng cm−3. The maximum daily wet deposition flux was found to be 23 ng m−2 d−1. Despite the low temporal resolution of our measurements combined with their potential errors, the linear regression of the Hg deposition fluxes against the snow accumulation rates allowed us to estimate the mean dry deposition rate from the intercept of the graph as −0.005 +- 0.008 ng m−2 d−1. From this analysis, we conclude that wet deposition accounts for the vast majority of the Hg deposition fluxes at Concordia Station. The number of snow events, together with the continuous GEM measurements have allowed us to make a first estimation of the mean snow scavenging factor at Dome C. Using the slope of the regression of mercury flux on snow accumulation we obtained a snow scavenging factor that ranges from 0.21 to 0.22 ± 0.02 (ngHg/g snow)/(ngHg/m3air). Our data indicate that the boundary layer height and local meteorological effects influence Hg0 reemission from the top of (0–3 cm) the snowpack into the atmosphere and into the deeper snowpack layer (3–6 cm). These data will help constrain numerical models on the behaviour of mercury in Antarctica. © 2021 Elsevier Ltd
关键词	Atmospheric conditions High resolution sampling Snow scavenging factor Snow sublimation
语种	英语
scopus关键词	Boundary layers; Deposition rates; Domes; Mercury (metal); Antarctic plateau; Atmospheric conditions; Austral summers; Deposition fluxes; Depositional fluxes; High resolution sampling; Snow accumulation; Snow scavenging factor; Snow sublimation; Surface snow; Snow; ambient air; boundary layer; mercury (element); regression; scavenging (chemistry); snowpack; wet deposition; Antarctica; Dome Concordia; East Antarctica
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248282
作者单位	CNR-Institute of Polar Sciences (ISP-CNR), 155 Via Torino, Mestre, 30170, Italy; Institut des Géosciences de l'Environnement, Université Grenoble Alpes, CNRS, IRD, Grenoble INP, Grenoble, 38400, France; CNRS, IRD, CET, Université Paul Sabatier–Toulouse III, Toulouse, France; Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, United States; Department of Environmental Sciences, Informatics and Statistics, University Ca’ Foscari of Venice, 155 Via Torino, Mestre30170, Italy; Institute of Atmospheric Sciences and Climate (CNR-ISAC), Via P. Gobetti 101, Bologna, 40129, Italy; CNR-Institute of Atmospheric Pollution Research (IIA-CNR), Division of Rende, UNICAL-Polifunzionale, Rende87036, Italy; ENEA, C.R. Casaccia, Roma, 00123, Italy
推荐引用方式 GB/T 7714	Cairns W.R.,Turetta C.,Maffezzoli N.,et al. Mercury in precipitated and surface snow at Dome C and a first estimate of mercury depositional fluxes during the Austral summer on the high Antarctic plateau[J],2021,262.
APA	Cairns W.R..,Turetta C..,Maffezzoli N..,Magand O..,Araujo B.F..,...&Spolaor A..(2021).Mercury in precipitated and surface snow at Dome C and a first estimate of mercury depositional fluxes during the Austral summer on the high Antarctic plateau.ATMOSPHERIC ENVIRONMENT,262.
MLA	Cairns W.R.,et al."Mercury in precipitated and surface snow at Dome C and a first estimate of mercury depositional fluxes during the Austral summer on the high Antarctic plateau".ATMOSPHERIC ENVIRONMENT 262(2021).