Merkling T, Agdere L, Albert A, Durieux R, Hatch SA, Danchin E & Blanchard P. (2014). Experimental manipulation of hatching asynchrony influences the course and outcome of sibling competition..
Abstract: Australian Society for the Study of Animal Behaviour 2014 (Katoomba, NSW, Australia) 1-4 July 2014
Programme: 1162
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Testut L. (2014). L'élévation du niveau des mers..
Abstract: Colloque-débat “Réduire les risques littoraux et s'adapter au changement climatique”, 2-4 avril 2014, La Rochelle.
Programme: 688
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L. Testut and A.S Unnikrishnan. (2014). Overview of the Sea Level research activities in France, Indo-French collaboration : current status and perspective.
.
Abstract: 20 January 2014, INCOIS, Hyderabad (India).
Programme: 688
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Calzas M, C. Brachet, C. Drezen, L. Fichen, C. Guillerm, A. Guillot, L. Testut and P. Bonnefond. (2014). New technological development : Tide Station, Static and Towed GPS Buoys for Satellite Altimetry Calibration.
Abstract: AGU Fall Meeting, 15-19 December 2014, San Francisco
Programme: 688
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Calzas M, C. Brachet, C. Drezen, L. Fichen, C. Guillerm, A. Guillot, L. Testut and P. Bonnefond.
. (2014). New technological development for CAL/VAL activities.
Abstract: OST-ST Meeting 26-31 October 2014, Germany.
Programme: 688
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Trouvilliez Alexandre, Naaim-Bouvet Florence, Genthon Christophe, Piard Luc, Favier Vincent, Bellot Hervé, Agosta Cécile, Palerme Cyril, Amory Charles, Gallée Hubert, . (2014). A novel experimental study of aeolian snow transport in Adelie Land (Antarctica)
. Cold Regions Science and Technology, 108, 125–138.
Abstract: None of the previous aeolian snow transport campaigns in Antarctica meet the requirements in terms of temporal resolution, long-term series and qualified instruments for evaluations of meteorological and climate models including parameterization for aeolian snow transport. Consequently, determining the quantity of snow transported remains a challenge. A field campaign was therefore launched in January 2009, in Adélie Land, Antarctica, to acquire new model-evaluation-oriented observations within the European ICE2SEA project, with the logistical support of the French polar Institute (IPEV). The available aeolian snow transport sensors are reviewed and the sensor that best suited our specific needs was chosen: FlowCapt™ acoustic sensors. Three automatic weather stations were deployed with FlowCapts™ close to the coast. The stations' locations are distinct, ranging from 1 to 100km inland, one of them with a 7-m mast with six levels of anemometers and thermohygrometers. The fluid and impact threshold friction velocities recorded were 0.48±0.09ms−1 and 0.4±0.09ms−1, respectively, with a high standard deviation of 0.12±0.03ms−1 and 0.13±0.03ms−1, respectively. The aeolian snow transport frequency in Adélie Land was very high with seasonal variation of transport occurring with minima during the austral summer. Seven percent of the aeolian snow transport events were drifting snow (maximum particle's height, <1m above the surface). The snow quantity transported was above 1kiloton per year in the first meter above the surface.
Keywords: Aeolian transport, Antarctica, Blowing snow, Drifting snow,
Programme: 411,1013
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Triest J, Alemany O, . (2014). Drill fluid selection for the SUBGLACIOR probe: a review of silicone oil as a drill fluid
. Annals of Glaciology, 55(68), 311–321.
Abstract: As part of the ICE&LASER/SUBGLACIOR projects, an innovative probe called SUBGLACIOR is developed with the aim of perforating the ice sheet down to depths of 3500m in a single season and continuously measuring in situ the isotopic composition of the meltwater and the methane concentration in trapped gases. Ice chips generated by the electromechanical drilling will be removed from the borehole by circulating a drill fluid. The selection of this drill fluid is important as it will have a major impact on the performance and the environmental evaluation. A literature review of drilling liquids is carried out to select potential fluids for further detailed testing. The selected fluids are varying grades of silicone oils, known as linear polydimethylsiloxanes, and ESTISOL™ 140, an aliphatic ester. The requirements for this project are similar to those for other deep ice-core drilling projects but, due to the embedded analytical system and the speed of drilling, there are some specific considerations. Following extensive testing, we conclude that a silicone fluid with a kinematic viscosity of 3mm2 s–1 (3 cSt) is ideally suitable and affordable. This evaluation provides new insights into the use of silicone oils as a drill fluid that are of use to the wider ice-core drilling community.
Programme: 1119
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Duphil Romain, Possenti Philippe, Piard Luc, . (2014). A new leak-tight borehole casing at Dome Concordia station, Antarctica, for the SUBGLACIOR project
. Annals of Glaciology, 55(68), 351–354.
Abstract: In the frame of the SUBGLACIOR project, a new type of casing has been installed for testing during the 2013/14 austral summer season at Dome Concordia station, Antarctica. The SUBGLACIOR probe requires a full fluid column up to the surface, in order to circulate fluid for icechips recovery. This makes it essential that the casing is leak-tight through the porous firn column. We have evaluated existing solutions before opting to test a new method. This new system is made of polyethylene pipes which are welded together at the surface while the casing pipes are lowered into the reamed borehole. It is simple and lightweight and allows the casing to be installed quickly with
optimum chance of being leak-tight. The installed casing has been tested both with compressed air and drilling fluids and has proven to work.
Programme: 1119
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Alemany O, Chappellaz J, Triest J, Calzas M, Cattani O, Chemin JF, Desbois Q, Desbois T, Duphil R, Falourd S, Grilli R, Guillerme C, Kerstel E, Laurent B, Lefebvre E, Marrocco N, Pascual O, Piard L, Possenti P, Romanini D, Thiebaut V, Yamani R, . (2014). The SUBGLACIOR drilling probe: concept and design
. Annals of Glaciology, 55(68), 233–242.
Abstract: In response to the ‘oldest ice’ challenge initiated by the International Partnerships in Ice Core Sciences (IPICS), new rapid-access drilling technologies through glacier ice need to be developed. These will provide the information needed to qualify potential sites on the Antarctic ice sheet where the deepest section could include ice that is >1Ma old and still in good stratigraphic order. Identifying a suitable site will be a prerequisite for deploying a multi-year deep ice-core drilling operation to elucidate the cause and mechanisms of the mid-Pleistocene transition from 40 ka glacial–interglacial cycles to 100 ka cycles. As part of the ICE&LASERS/SUBGLACIOR projects, we have designed an innovative probe, SUBGLACIOR, with the aim of perforating the ice sheet down to the bedrock in a single season and continuously measuring in situ the isotopic composition of the melted water and the methane concentration in trapped gases. Here we present the general concept of the probe, as well as the various technological solutions that we have favored so far to reach this goal.
Programme: 1119
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Grilli R, Marrocco N, Desbois T, Guillerm C, Triest J, Kerstel E, Romanini D, . (2014). Invited article: SUBGLACIOR: an optical analyzer embedded in an Antarctic ice probe for exploring the past climate.
. The Review of scientific instruments, 85(11), 111301.
Abstract: This article describes the advances made in the development of a specific optical spectrometer based
on the Optical Feedback-Cavity Enhanced Absorption Spectroscopy technique for exploring past climate
by probing the original composition of the atmosphere stored in the ice sheet of a glacier. Based on significant technological progresses and unconventional approaches, SUBGLACIOR will be a
revolutionary tool for ice-core research: the optical spectrometer, directly embedded in the drilling probe, will provide in situ real-time measurements of deuterium isotopic variations (δ2H ) and CH4 concentrations down to 3500 m of ice depth within a single Antarctic season. The instrument will provide simultaneous and real-time vertical profiles of these two key climate signatures in order to evaluate if a target site can offer ice cores as old as 1.5 million years by providing direct insight into past temperatures and climate cycles. The spectrometer has a noise equivalent absorption coefficient of 2.8 × 10-10 cm-1 Hz-1/2, corresponding to a detection limit of 0.2 ppbv for CH4 and a precision of 0.2‰ on the δ2H of H2O within 1 min acquisition time.
Programme: 1119
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