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Song S, Selin N E, Soerensen A L, Angot H, Artz R, Brooks S, Brunke E-G, Conley G, Dommergue A, Ebinghaus R, Holsen T M, Jaffe D A, Kang S, Kelley P, Luke W T, Magand O, Marumoto K, Pfaffhuber K A, Ren X, Sheu G-R, Slemr F, Warneke T, Weigelt A, Weiss-Penzias P, Wip D C, Zhang Q, |
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Title |
Top-down constraints on atmospheric mercury emissions and implications for global biogeochemical cycling
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Journal Article |
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2015 |
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Atmospheric Chemistry and Physics |
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15 |
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12 |
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7103-7125 |
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1028 |
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Copernicus GmbH |
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6219 |
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Dommergue, A., Angot, H., and Magand, O. |
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Recent measurements of atmospheric mercury in the Southern Hemisphere and their contribution to the understanding of Hg cycle |
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Conference - International - Poster |
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2015 |
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6220 |
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Angot, H., Dommergue, A., Magand, O., Helmig, D., Pirrone, N., and Sprovieri, F.: |
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Year-round record of gaseous mercury in air and snow: new insights into mercury reactivity in Central Antarctica (Dome C |
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Conference - International - Poster |
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2015 |
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6221 |
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Sprovieri, F., Pirrone, N., Bencardino, M., D'Amore, F., Angot, H., Barbante, C., Brunke, E.G., Arcega-Cabrera, F., Cairns, W., Comero, S., Diéguez, M.D.C., Dommergue, A., Ebinghaus, R., Feng, X.B., Fu, X., Garcia, P.E., Gawlik, B.M., Hageström, U., Hansson, K., Horvat, M., Kotnik, J., Labuschagne, C., Magand, O., Martin, L., Mashyanov, N., Mkololo, T., Munthe, J., Obolkin, V., Islas, M.R., Sena, F., Somerset, V., Spandow, P., Vardè, M., Walters, C., Wängberg, I., Weigelt, A., Yang, X., Zhang, H. |
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Title |
Five-year records of Total Mercury Deposition flux at GMOS sites in the Northern and Southern Hemispheres. |
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Journal Article |
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Year |
2016 |
Publication |
Atmos. chem. phys. |
Abbreviated Journal |
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Volume |
17 |
Issue |
4 |
Pages |
2689-2708 |
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1028 |
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yes |
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6558 |
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Pearce, D.A., Alekhina, I.A., Terauds, A., Wilmotte, A., Quesada, A., Edwards, A., Dommergue, A., Sattler, B., Adams, B., Magalhães, C.M., Chu, W.-L., Lau, M., Cary, S.C., Smith, D.J., Wall, D.H., Eguren, G., Matcher, G., Bradley, J., De Vera, J.-P.P., Elster, J., Hughes, K.A., Benning, L.G., Gunde - Cimerman, N., Convey, P., Hong, S.G., Pointing, S.B., Pellizari, V.H., Vincent, W.F., 2016. |
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Title |
Aerobiology over Antarctica – a new initiative for atmospheric ecology |
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Journal Article |
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Year |
2016 |
Publication |
Frontiers in microbiology |
Abbreviated Journal |
1664-302X |
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7 |
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The role of aerial dispersal in shaping patterns of biodiversity remains poorly understood, mainly due to a lack of coordinated efforts in gathering data at appropriate temporal and spatial scales. It has been long known that the rate of dispersal to an ecosystem can significantly influence ecosystem dynamics, and that aerial transport has been identified as an important source of biological input to remote locations. With the considerable effort devoted in recent decades to understanding atmospheric circulation in the south polar region, a unique opportunity has emerged to investigate the atmospheric ecology of Antarctica, from local to continental scales. This concept note identifies key questions in Antarctic microbial biogeography and the need for standardized sampling and analysis protocols to address such questions. A consortium of polar aerobiologists is established to bring together researchers with a common interest in the airborne dispersion of microbes and other propagules in the Antarctic, with opportunities for comparative studies in the Arctic. |
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yes |
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6559 |
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Nerentorp Mastromonaco, M., Gårdfeldt, K., Jourdain, B., Abrahamsson, K., Granfors, A., Ahnoff, M., Dommergue, A., Méjean, G., Jacobi, H.W. |
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Title |
Antarctic winter mercury and ozone depletion events over sea ice. |
Type |
Journal Article |
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Year |
2016 |
Publication |
Atmospheric environment |
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Volume |
129 |
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125-132 |
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During atmospheric mercury and ozone depletion events in the springtime in polar regions gaseous elemental mercury and ozone undergo rapid declines. Mercury is quickly transformed into oxidation products, which are subsequently removed by deposition. Here we show that such events also occur during Antarctic winter over sea ice areas, leading to additional deposition of mercury. Over four months in the Weddell Sea we measured gaseous elemental, oxidized, and particulate-bound mercury, as well as ozone in the troposphere and total and elemental mercury concentrations in snow, demonstrating a series of depletion and deposition events between July and September. The winter depletions in July were characterized by stronger correlations between mercury and ozone and larger formation of particulate-bound mercury in air compared to later spring events. It appears that light at large solar zenith angles is sufficient to initiate the photolytic formation of halogen radicals. We also propose a dark mechanism that could explain observed events in air masses coming from dark regions. Br2 that could be the main actor in dark conditions was possibly formed in high concentrations in the marine boundary layer in the dark. These high concentrations may also have caused the formation of high concentrations of CHBr3 and CH2I2 in the top layers of the Antarctic sea ice observed during winter. These new findings show that the extent of depletion events is larger than previously believed and that winter depletions result in additional deposition of mercury that could be transferred to marine and terrestrial ecosystems. |
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1028 |
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1352-2310 |
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6560 |
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Angot, H., Magand, O., Helmig, D., Ricaud, P., Quennehen, B., Gallée, H., Del Guasta, M., Sprovieri, F., Pirrone, N., Savarino, J., Dommergue, A. |
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Title |
New insights into the atmospheric mercury cycling in central Antarctica and implications on a continental scale |
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Journal Article |
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Year |
2016 |
Publication |
Atmospheric chemistry and physics |
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16 |
Issue |
13 |
Pages |
8249-8264 |
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Under the framework of the GMOS project (Global Mercury Observation System) atmospheric mercury monitoring has been implemented at Concordia Station on the high-altitude Antarctic plateau (75°06′ S, 123°20′ E, 3220 m above sea level). We report here the first year-round measurements of gaseous elemental mercury (Hg(0)) in the atmosphere and in snowpack interstitial air on the East Antarctic ice sheet. This unique data set shows evidence of an intense oxidation of atmospheric Hg(0) in summer (24-hour daylight) due to the high oxidative capacity of the Antarctic plateau atmosphere in this period of the year. Summertime Hg(0) concentrations exhibited a pronounced daily cycle in ambient air with maximal concentrations around midday. Photochemical reactions and chemical exchange at the air–snow interface were prominent, highlighting the role of the snowpack on the atmospheric mercury cycle. Our observations reveal a 20 to 30 % decrease of atmospheric Hg(0) concentrations from May to mid-August (winter, 24 h darkness). This phenomenon has not been reported elsewhere and possibly results from the dry deposition of Hg(0) onto the snowpack. We also reveal the occurrence of multi-day to weeklong atmospheric Hg(0) depletion events in summer, not associated with depletions of ozone, and likely due to a stagnation of air masses above the plateau triggering an accumulation of oxidants within the shallow boundary layer. Our observations suggest that the inland atmospheric reservoir is depleted in Hg(0) in summer. Due to katabatic winds flowing out from the Antarctic plateau down the steep vertical drops along the coast and according to observations at coastal Antarctic stations, the striking reactivity observed on the plateau most likely influences the cycle of atmospheric mercury on a continental scale. |
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1028 |
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1680-7316 |
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yes |
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6561 |
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Angot, H., Dion, I., Vogel, N., Legrand, M., Magand, O., Dommergue, A. |
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Multi-year record of atmospheric mercury at Dumont d'Urville, East Antarctic coast: continental outflow and oceanic influences |
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Journal Article |
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Year |
2016 |
Publication |
Atmospheric chemistry and physics |
Abbreviated Journal |
1680-7316 |
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Volume |
16 |
Issue |
13 |
Pages |
8265-8279 |
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Under the framework of the Global Mercury Observation System (GMOS) project, a 3.5-year record of atmospheric gaseous elemental mercury (Hg(0)) has been gathered at Dumont d'Urville (DDU, 66°40′ S, 140°01′ E, 43 m above sea level) on the East Antarctic coast. Additionally, surface snow samples were collected in February 2009 during a traverse between Concordia Station located on the East Antarctic plateau and DDU. The record of atmospheric Hg(0) at DDU reveals particularities that are not seen at other coastal sites: a gradual decrease of concentrations over the course of winter, and a daily maximum concentration around midday in summer. Additionally, total mercury concentrations in surface snow samples were particularly elevated near DDU (up to 194.4 ng L−1) as compared to measurements at other coastal Antarctic sites. These differences can be explained by the more frequent arrival of inland air masses at DDU than at other coastal sites. This confirms the influence of processes observed on the Antarctic plateau on the cycle of atmospheric mercury at a continental scale, especially in areas subject to recurrent katabatic winds. DDU is also influenced by oceanic air masses and our data suggest that the ocean plays a dual role on Hg(0) concentrations. The open ocean may represent a source of atmospheric Hg(0) in summer whereas the sea-ice surface may provide reactive halogens in spring that can oxidize Hg(0). This paper also discusses implications for coastal Antarctic ecosystems and for the cycle of atmospheric mercury in high southern latitudes. |
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1680-7316 |
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6562 |
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F. Sprovieri, N. Pirrone, M. Bencardino, F. D'Amore, H. Angot, C. Barbante, E.-G. Brunke, F. Arcega-Cabrera, W. Cairns, S. Comero, M. D. C. Diéguez, A. Dommergue, R. Ebinghaus, X. B. Feng, X. Fu, P. E. Garcia, B. M. Gawlik, U. Hageström, K. Hansson, M. Horvat, J. Kotnik, C. Labuschagne, O. Magand, L. Martin, N. Mashyanov, T. Mkololo, J. Munthe, V. Obolkin, M. Ramirez Islas, F. Sena, V. Somerset, P. Spandow, M. Vardè, C. Walters, I. Wängberg, A. Weigelt, X. Yang, H. Zhang |
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Title |
Five-year records of mercury wet deposition flux at GMOS sites in the Northern and Southern hemispheres |
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Journal |
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Year |
2017 |
Publication |
Atmos. chem. phys. |
Abbreviated Journal |
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Volume |
17 |
Issue |
4 |
Pages |
2689-2708 |
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The atmospheric deposition of mercury (Hg) occurs via several mechanisms, including dry and wet scavenging by precipitation events. In an effort to understand the atmospheric cycling and seasonal depositional characteristics of Hg, wet deposition samples were collected for approximately 5 years at 17 selected GMOS monitoring sites located in the Northern and Southern hemispheres in the framework of the Global Mercury Observation System (GMOS) project. Total mercury (THg) exhibited annual and seasonal patterns in Hg wet deposition samples. Interannual differences in total wet deposition are mostly linked with precipitation volume, with the greatest deposition flux occurring in the wettest years. This data set provides a new insight into baseline concentrations of THg concentrations in precipitation worldwide, particularly in regions such as the Southern Hemisphere and tropical areas where wet deposition as well as atmospheric Hg species were not investigated before, opening the way for future and additional simultaneous measurements across the GMOS network as well as new findings in future modeling studies. |
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1028 |
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1680-7324 |
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1680-7324 |
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6588 |
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O. Travnikov, H. Angot, P. Artaxo, M. Bencardino, J. Bieser, F. D'Amore, A. Dastoor, F. De Simone, M. D. C. Diéguez, A. Dommergue, R. Ebinghaus, X. B. Feng, C. N. Gencarelli, I. M. Hedgecock, O. Magand, L. Martin, V. Matthias, N. Mashyanov, N. Pirrone, R. Ramachandran, K. A. Read, A. Ryjkov, N. E. Selin, F. Sena, S. Song, F. Sprovieri, D. Wip, I. Wängberg, X. Yang |
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Title |
Multi-model study of mercury dispersion in the atmosphere: atmospheric processes and model evaluation |
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2017 |
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Atmos. chem. phys. |
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17 |
Issue |
8 |
Pages |
5271-5295 |
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Current understanding of mercury (Hg) behavior in the atmosphere contains significant gaps. Some key characteristics of Hg processes, including anthropogenic and geogenic emissions, atmospheric chemistry, and air–surface exchange, are still poorly known. This study provides a complex analysis of processes governing Hg fate in the atmosphere involving both measured data from ground-based sites and simulation results from chemical transport models. A variety of long-term measurements of gaseous elemental Hg (GEM) and reactive Hg (RM) concentration as well as Hg wet deposition flux have been compiled from different global and regional monitoring networks. Four contemporary global-scale transport models for Hg were used, both in their state-of-the-art configurations and for a number of numerical experiments to evaluate particular processes. Results of the model simulations were evaluated against measurements. As follows from the analysis, the interhemispheric GEM gradient is largely formed by the prevailing spatial distribution of anthropogenic emissions in the Northern Hemisphere. The contributions of natural and secondary emissions enhance the south-to-north gradient, but their effect is less significant. Atmospheric chemistry has a limited effect on the spatial distribution and temporal variation of GEM concentration in surface air. In contrast, RM air concentration and wet deposition are largely defined by oxidation chemistry. The Br oxidation mechanism can reproduce successfully the observed seasonal variation of the RM ∕ GEM ratio in the near-surface layer, but it predicts a wet deposition maximum in spring instead of in summer as observed at monitoring sites in North America and Europe. Model runs with OH chemistry correctly simulate both the periods of maximum and minimum values and the amplitude of observed seasonal variation but shift the maximum RM ∕ GEM ratios from spring to summer. O3 chemistry does not predict significant seasonal variation of Hg oxidation. Hence, the performance of the Hg oxidation mechanisms under study differs in the extent to which they can reproduce the various observed parameters. This variation implies possibility of more complex chemistry and multiple Hg oxidation pathways occurring concurrently in various parts of the atmosphere. |
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1680-7324 |
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1680-7324 |
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6589 |
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