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Bown J, Boye M, Laan P, Bowie A R, Park Y-H, Jeandel C, Nelson D M, . (2012). Imprint of a dissolved cobalt basaltic source on the Kerguelen Plateau
. Biogeosciences, 9(12), 5279–5290.
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Landais A, Dreyfus G, Capron E, Pol K, Loutre M F, Raynaud D, Lipenkov V Y, Arnaud L, Masson-Delmotte V, Paillard D, Jouzel J, Leuenberger M, . (2012). Towards orbital dating of the EPICA Dome C ice core using δO2/N2
. Clim. Past, 8(1), 191–203.
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. (2012). Dynamic recycling of gaseous elemental mercury in the boundary layer of the Antarctic Plateau
. Atmos. Chem. Phys., 12(22), 11027–11036.
Abstract: Gaseous elemental mercury (Hg0) was investigated in the troposphere and in the interstitial air extracted from the snow at Dome Concordia station (alt. 3320 m) on the Antarctic Plateau during January 2009. Measurements and modeling studies showed evidence of a very dynamic and daily cycling of Hg0 inside the mixing layer with a range of values from 0.2 ng m−3 up to 2.3 ng m−3. During low solar irradiation periods, fast Hg0 oxidation processes in a confined layer were suspected. Unexpectedly high Hg0 concentrations for such a remote place were measured under higher solar irradiation due to snow photochemistry. We suggest that a daily cycling of reemission/oxidation occurs during summer within the mixing layer at Dome Concordia. Hg0 concentrations showed a negative correlation with ozone mixing ratios, which contrasts with atmospheric mercury depletion events observed during the Arctic spring. Unlike previous Antarctic studies, we think that atmospheric Hg0 removal may not be the result of advection processes. The daily and dramatic Hg0 losses could be a consequence of surface or snow induced oxidation pathways. It remains however unclear whether halogens are involved. The cycling of other oxidants should be investigated together with Hg species in order to clarify the complex reactivity on the Antarctic plateau.
Programme: 1028
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Gazeaux J, Bekki S, Naveau P, Keckhut P, Jumelet J, Parades J, David C, . (2012). Detection of particle layers in backscatter profiles: application to Antarctic lidar measurements
. 1680-7316, 12(7), 3205–3217.
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Pison I, Ringeval B, Bousquet P, Prigent C, Papa F, . (2013). Stable atmospheric methane in the 2000s: key-role of emissions from natural wetlands
. Atmos. Chem. Phys., 13(23), 11609–11623.
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Cavitte M G P, Blankenship D D, Young D A, Siegert M J, Le Meur E, . (2013). Radar stratigraphy connecting Lake Vostok and Dome C, East Antarctica, constrains the EPICA/DMC ice core time scale
. The Cryosphere Discuss., 7(1), 321–342.
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Gallet J-C, Domine F, Savarino J, Dumont M, Brun E, . (2014). The growth of sublimation crystals and surface hoar on the Antarctic plateau
. The Cryosphere, 8(4), 1205–1215.
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Slemr F, Angot H, Dommergue A, Magand O, Barret M, Weigelt A, Ebinghaus R, Brunke E-G, Pfaffhuber K A, Edwards G, Howard D, Powell J, Keywood M, Wang F, . (2015). Comparison of mercury concentrations measured at several sites in the Southern Hemisphere
. Atmos. Chem. Phys., 15(6), 3125–3133.
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Barral H, Genthon C, Trouvilliez A, Brun C, Amory C, . (2014). The Cryosphere Discuss., 8(3), 2759–2798.
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Gorodetskaya I V, Kneifel S, Maahn M, Van Tricht K, Schween J H, Crewell S, Van Lipzig N P M, . (2014). Cloud and precipitation properties from ground-based remote sensing instruments in East Antarctica
. The Cryosphere Discuss., 8(4), 4195–4241.
Abstract: A new comprehensive cloud-precipitation-meteorological observatory has been established at Princess Elisabeth base, located in the escarpment zone of Dronning Maud Land, East Antarctica. The observatory consists of a set of ground-based remote sensing instruments (ceilometer, infrared pyrometer and vertically profiling precipitation radar) combined with automatic weather station measurements of near-surface meteorology, radiative fluxes, and snow accumulation. In this paper, the observatory is presented and the potential for studying the evolution of clouds and precipitating systems is illustrated by case studies. It is shown that the synergetic use of the set of instruments allows for distinguishing ice, mixed-phase and precipitating clouds, including some information on their vertical extent. In addition, wind-driven blowing snow events can be distinguished from deeper precipitating systems. Cloud properties largely affect the surface radiative fluxes, with liquid-containing clouds dominating the radiative impact. A statistical analysis of all measurements (in total 14 months mainly occurring in summer/autumn) indicates that these liquid-containing clouds occur during as much as 20% of the cloudy periods. The cloud occurrence shows a strong bimodal distribution with clear sky conditions 51% of the time and complete overcast conditions 35% of the time. Snowfall occurred 17% of the cloudy periods with a predominance of light precipitation and only rare events with snowfall > 1 mm h-1 water equivalent (w.e.). Three of such intensive snowfall events occurred during 2011 contributing to anomalously large annual snow accumulation. This is the first deployment of a precipitation radar in Antarctica allowing to assess the contribution of the snowfall to the local surface mass balance. It is shown that on the one hand large accumulation events (>10 mm w.e. day-1) during the measurement period of 26 months were always associated with snowfall, but that on the other hand snowfall did not always lead to accumulation. In general, this promising set of robust instrumentation allows for improved insight in cloud and precipitation processes in Antarctica and can be easily deployed at other Antarctic stations.
Programme: 411
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