%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Zagorodnov, V.
%A Thompson, L. G.
%A Ginot, Patrick
%A Mikhalenk, V.
%T Intermediate-depth ice coring of high-altitude and polar glaciers with a lightweight drilling system
%D 2005
%L fdi:010056720
%G ENG
%J Journal of Glaciology
%@ 0022-1430
%M CC:0002406087-0017
%N 174
%P 491-501
%R 10.3189/172756505781829269
%U https://www.documentation.ird.fr/hor/fdi:010056720
%> https://www.documentation.ird.fr/intranet/publi/depot/2012-08-30/010056720.pdf
%V 51
%W Horizon (IRD)
%X A total of 11 ice cores to a maximum depth of 460 m have been obtained over the past 3 years from high-altitude glaciers on the saddle of Mount Bona and Mount Churchill in Alaska (designated B-C), and on Quelccaya ice cap and Nevado Coropuna in Peru. Ice coring was conducted using an intermediate-depth drilling system. The system includes an electromechanical drill (EMD) and an ethanol thermal electric drill (ETED). The EMD permitted an average ice-core production rate (ICPR) of 7.0 m h(-1) down to 150 m. An average ICPR of 2 m h(-1) to 460 m depth was possible with the ETED. The quality of the B-C ice cores is better than that of cores previously drilled with an EMD and ETED system. A new cutter design, drilling with a lubricant/cutting fluid and a new anti-torque assembly were tested in the laboratory and in glacier boreholes. We examine the performance of the drills in cold and temperate ice and in clean and particle-laden ice. The influence of the ethanol drilling fluid on ice-core isotopic, ionic and dust composition is discussed.