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DOI	10.5194/acp-19-13325-2019
	Diurnal cycle of iodine; bromine; and mercury concentrations in Svalbard surface snow
	Spolaor A.; Barbaro E.; Cappelletti D.; Turetta C.; Mazzola M.; Giardi F.; Björkman M.P.; Lucchetta F.; Dallo F.; Aspmo Pfaffhuber K.; Angot H.; Dommergue A.; Maturilli M.; Saiz-Lopez A.; Barbante C.; Cairns W.R.L.
发表日期	2019
ISSN	16807316
起始页码	13325
结束页码	13339
卷号	19 期号:20
英文摘要	Sunlit snow is highly photochemically active and plays a key role in the exchange of gas phase species between the cryosphere and the atmosphere. Here, we investigate the behaviour of two selected species in surface snow: mercury (Hg) and iodine (I). Hg can deposit year-round and accumulate in the snowpack. However, photo-induced re-emission of gas phase Hg from the surface has been widely reported. Iodine is active in atmospheric new particle formation, especially in the marine boundary layer, and in the destruction of atmospheric ozone. It can also undergo photochemical re-emission. Although previous studies indicate possible post-depositional processes, little is known about the diurnal behaviour of these two species and their interaction in surface snow. The mechanisms are still poorly constrained, and no field experiments have been performed in different seasons to investigate the magnitude of re-emission processes Three sampling campaigns conducted at an hourly resolution for 3 d each were carried out near Ny-Ålesund (Svalbard) to study the behaviour of mercury and iodine in surface snow under different sunlight and environmental conditions (24 h darkness, 24 h sunlight and day-night cycles). Our results indicate a different behaviour of mercury and iodine in surface snow during the different campaigns. The day-night experiments demonstrate the existence of a diurnal cycle in surface snow for Hg and iodine, indicating that these species are indeed influenced by the daily solar radiation cycle. Differently, bromine did not show any diurnal cycle. The diurnal cycle also disappeared for Hg and iodine during the 24 h sunlight period and during 24 h darkness experiments supporting the idea of the occurrence (absence) of a continuous recycling or exchange at the snow-air interface. These results demonstrate that this surface snow recycling is seasonally dependent, through sunlight. They also highlight the non-negligible role that snowpack emissions have on ambient air concentrations and potentially on iodine-induced atmospheric nucleation processes. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric chemistry; boundary layer; bromine; concentration (composition); diurnal variation; iodine; marine atmosphere; mercury (element); ozone; photochemistry; snow; Arctic; Svalbard; Svalbard and Jan Mayen
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/144066
作者单位	Institute of Polar Science, ISP-CNR, Campus Scientifico Via Torino 155, Mestre, Venice, 30172, Italy; Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Perugia, 06123, Italy; Institute of Polar Science, ISP-CNR, Via P. Gobetti 101, Bologna, Italy; Chemistry Department - Analytical Chemistry, Scientific Pole, University of Florence, Via della Lastruccia 3, Sesto Fiorentino (Florence), 50019, Italy; Department of Earth Sciences, University of Gothenburg, P.O. Box 460, Gothenburg, 40530, Sweden; Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Santa Marta - Dorsoduro 2137, Venice, 30123, Italy; NILU - Norwegian Institute for Air Research, Kjeller, Norway; Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, United States; Institut des Géosciences de l'Environnement, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, Grenoble, 38000, France; Alfred Wegener Institute, Helmholtz Centre for Polar and...
推荐引用方式 GB/T 7714	Spolaor A.,Barbaro E.,Cappelletti D.,et al. Diurnal cycle of iodine; bromine; and mercury concentrations in Svalbard surface snow[J],2019,19(20).
APA	Spolaor A..,Barbaro E..,Cappelletti D..,Turetta C..,Mazzola M..,...&Cairns W.R.L..(2019).Diurnal cycle of iodine; bromine; and mercury concentrations in Svalbard surface snow.Atmospheric Chemistry and Physics,19(20).
MLA	Spolaor A.,et al."Diurnal cycle of iodine; bromine; and mercury concentrations in Svalbard surface snow".Atmospheric Chemistry and Physics 19.20(2019).