Talks by Dr Mark Curran & Andrea Spolaor – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > NBI Calendar 2014 > Talks by Dr Mark Curra...

Talks by Dr Mark Curran & Andrea Spolaor

Hrs. 13-14

Aurora Basin Drilling project - A Science and field season overview


Talk by Dr Mark Curran
chief scientist of the Aurora Basin ice core drilling project

Abstract
The Aurora Basin North (ABN) drilling project aimed, as part of the IPICS array, to drill a 2000 year old ice core from a sparsely sampled region of East Antarctica. The project took place over a 5 week period during the 13-14 field season. The project involved 7 nations, 17 institutions and over 30 scientists, with the Centre for Ice and Climate being one of 3 major partners.  Trevor Popp and Simon Sheldon drilled a 303m ice core dating back at least 2000 years and this ice has returned to Australia for cutting and analysis.  Other shallow drilling and sampling projects were also undertaken, including ECM as set up in the field by JP Steffensen. This talk will give an overview of the science behind the ice core and the work undertaken in Antarctica, including a pictorial overview of the field season.  We have some results from the field which I will share.
Short air/coffee refresh
Hrs. 14-15

Halogens pole to pole – The GV7 and Svalbard expeditions


Talk by Andrea Spolaor
Department of Environmental Sciences, Informatics, and Statistics, University Ca’ Foscari of Venice, Venice, Italy,
Institute for the Dynamics of Environmental Science, National Research Council (CNR-IDPA), Dorsoduro 2137, 30123 Venice, Italy;

Abstract
Sea ice is an integral part of the Earth’s climate system because it affects planetary albedo, ocean circulation, sea surface salinity, and the atmosphere-ocean exchange of reactive gases and aerosols. Arctic sea ice has declined faster than predicted, and the annual duration of sea ice at the Antarctic Peninsula has decreased by over 85 days during the past 30 years. A key goal in paleoclimate research is to find a quantitative proxy of sea ice extent. The halogens Iodine (I) and Bromine (Br) are closely related to sea ice processes. Br reacts with the sea ice surface in auto-catalyzing “Bromine explosion” events. Iodine is emitted from algal communities growing under sea ice. Iodine (I) and bromine (Br) have been measured in the northern hemisphere, in particular in two shallow cores drilled in the Svalbard Archipelago. In 2012, a first shallow core was drilled at the top of the Holtedhalfonna glacier (79° 09’N, 13° 23’ E, at an altitude of 1150 m.a.s.l.), while in 2013 a second core was drilled in the Staxrudafonna glacier (79°50’N, 11°45’E, at an altitude of 920 m.a.s.l.). Additional data for evaluating the seasonal variation of these elements have been obtained from snowpit samples recovered at the NEEM camp. In the 2013/14 Austral summer a team of Italian and Korean scientists performed a new drilling in Antarctica, in the site of GV7 (70°41'08.5'' S, 158°51'49.4'' E, 1957 m.a.s.l.). The site was selected for its high snow accumulation to obtain a high temporal resolution record of the last 2k years. The location of the drilling makes the core important to evaluate the marine related process. In addition, during the field campaign other experiments have been performed. In particular the daily effect of light on the surface snow has been evaluated with particular attention to some reactive elements, such as Br and I. In addition, during the traverse from Talos Dome (159°04'21"E, 72°47'14"S, 2318.5 m) to GV7, several surface snow cores (2 metres depth) were collected with the aim of investigating changes in snow composition and possible transport effects for specific elements.  

Thanks to:
Paul Vallelonga
Carlo Barbante
John M.C. Plane
Anja Schönhardt
Massimo Frezzotti
Jacopo Gabrieli