Abstract: This report and the reports of the 2009 and 2011 similar Antarctic gravity campaigns are available from http://eost.unistra.fr/observatoires/observatoires-geophysiques-globaux/obsgravi/recherches-associees/rebond-post-glaciaire/

Abstract: This paper will discuss an on-going project involving 3 researchers and 4 inuit communities in Nunavik (Kangiqsujuaq, Umiujaq and Kuujjuaraapik) and in the NWT (Ulukhaktok, called Holman until 2006.) The project looks at pictures taken by Inuit and representing their families and/or their surroundings (human settlements, the land and landscapes), in familiar or unfamiliar settings (i.e: a campsite outside one's community vs a southern city where one was visiting). Depending on the topic different methodologies are used for data collections. Véronique Antomarchi will mainly work on family photo albums handed out to her by Inuit from Kangiqsujuaq, Umiujaq and Kuujjuaraapik. Béatrice Collignon will build and analyze a collection of pictures taken by Ulukhaktuurmiut when travelling outside of their region and chosen by themselves, at her request, as their “favourite” and/or “most representative” ones. Meanwhile, Fabienne Joliet (PI of the project) will set a “landscape photographic observatory” in Kangiqsujuaq (Nunavik), with professional Inuit photographer Yaaka Yaaka taking pictures of the same view 6 times/year from 2012 to 2014. This series will complement the one she already gathered from 2009 to 2011 in the communities of Umiujaq and Kuujjuaraapik where inhabitants were asked to take pictures of their favourite landscapes in their surroundings (the community and the most travelled land around). Through the crossed study of these collections we seek to better understand Inuit self-representation of one's self and one's culture, as well as raise awareness of the value of such self-representation, both among Inuit and non-Inuit. At this early stage of the project comments and suggestions from the audience will be more than welcome.

Abstract: This paper summarizes the objectives and setting of the OPALE (Oxidant Production over Antarctic Land and its Export) project during summer 2010/2011 at Dumont d'Urville. The primary goal of the campaign is to characterize the oxidizing environment of the atmospheric boundary layer along the coast of East Antarctica. A summary of the relevant field chemical measurements is presented including the carbon monoxide and ammonia records that are used here to identify local influences due to station activities and penguin emissions. An overview of the basic meteorological conditions experienced by the site is presented including the results from the trajectory/dispersion model FLEXPART to highlight which types of air mass were sampled (marine boundary layer versus continental Antarctic air). The results of the FLEXPART analysis demonstrate that high ozone levels and related changes in the OH concentrations are associated with the transport of continental air to DDU. Finally, three companion papers are introduced. A first paper is dedicated to the impact of local penguin emissions on the atmospheric budget of several oxygenated volatile organic compounds. The second paper reports on HONO levels that were measured for the first time in Antarctica by using the long path absorption photometer (LOPAP) technique. Finally, in a third paper, major findings on the HOx levels are detailed, leading to the overall conclusion that the photochemistry at coastal East Antarctica is strongly driven by an efficient HOx chemistry compared to the situation at other coastal Antarctic regions.

Abstract: This paper summarizes recent advances in our understanding of geomagnetism, and its relevance to terrestrial space weather. It also discusses specific core magnetic field features such as the dipole moment decay, the evolution of the South Atlantic anomaly, and the location of the magnetic poles that are of importance for the practice of space weather.

Abstract: This paper reports the first rare earth element (REE) concentrations in accreted ice refrozen from sub-glacial Lake Vostok (East Antarctica). REE were determined in various sections of the Vostok ice core in order to geochemically characterize its impurities. Samples were obtained from accreted ice and, for comparison, from the upper glacier ice of atmospheric origin (undisturbed, disturbed and glacial flour ice). REE concentrations ranged between 0.856 pg g1 for Ce and 0.00350.24 pg g1 for Lu in glacier ice, and between <0.124 pg g1 for Ce and <0.00040.02 pg g1 for Lu in accreted ice. Interestingly, the REE concentrations in the upper accreted ice (AC1; characterized by visible aggregates containing a mixture of very fine terrigenous particles) and in the deeper accreted ice (AC2; characterized by transparent ice) are lower than those in fresh water and seawater, respectively. We suggest that such ultra-low concentrations are unlikely to be representative of the real REE content in Lake Vostok, but instead may reflect phase exclusion processes occurring at the ice/water interface during refreezing. In particular, the uneven spatial distribution (on the order of a few cm) and the large range of REE concentrations observed in AC1 are consistent with the occurrence/absence of the aggregates in adjacent ice, and point to the presence of solid-phase concentration/exclusion processes occurring within separate pockets of frazil ice during AC1 formation. Interestingly, if the LREE enrichment found in AC1 was not produced by chemical fractionation occurring in Lake Vostok water, this may reflect a contribution of bedrock material, possibly in combination with aeolian dust released into the lake by melting of the glacier ice. Collectively, this valuable information provides new insight into the accreted ice formation processes, the bedrock geology of East Antarctica as well as the water chemistry and circulation of Lake Vostok.