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  • 1. Wilhelms, Frank
    et al.
    Miller, Heinrich
    Gerasimoff, Michael D.
    Druecker, Cord
    Frenzel, Andreas
    Fritzsche, Diedrich
    Grobe, Hannes
    Hansen, Steffen Bo
    Hilmarsson, Sverrir A. E.
    Hoffmann, Georg
    Hörnby, Kerstin
    Stockholm University, Faculty of Science, Department of Physical Geography.
    Jaeschke, Andrea
    Jakobsdottir, Steinunn S.
    Juckschat, Paul
    Karsten, Achim
    Karsten, Lorenz
    Kaufmann, Patrik R.
    Karlin, Torbjorn
    Stockholm University, Faculty of Science, Department of Physical Geography.
    Kohlberg, Eberhard
    Kleffel, Guido
    Lambrecht, Anja
    Lambrecht, Astrid
    Lawer, Gunther
    Schaermeli, Ivan
    Schmitt, Jochen
    Sheldon, Simon G.
    Takata, Morimasa
    Trenke, Marcus
    Twarloh, Birthe
    Valero-Delgado, Fernando
    Wilhelms-Dick, Dorothee
    The EPICA Dronning Maud Land deep drilling operation2014In: Annals of Glaciology, ISSN 0260-3055, E-ISSN 1727-5644, Vol. 55, no 68, p. 355-366Article in journal (Refereed)
    Abstract [en]

    We report on the EPICA Dronning Maud Land (East Antarctica) deep drilling operation. Starting with the scientific questions that led to the outline of the EPICA project, we introduce the setting of sister drillings at NorthGRIP and EPICA Dome C within the European ice-coring community. The progress of the drilling operation is described within the context of three parallel, deep-drilling operations, the problems that occurred and the solutions we developed. Modified procedures are described, such as the monitoring of penetration rate via cable weight rather than motor torque, and modifications to the system (e.g. closing the openings at the lower end of the outer barrel to reduce the risk of immersing the drill in highly concentrated chip suspension). Parameters of the drilling (e.g. corebreak force, cutter pitch, chips balance, liquid level, core production rate and piece number) are discussed. We also review the operational mode, particularly in the context of achieved core length and piece length, which have to be optimized for drilling efficiency and core quality respectively. We conclude with recommendations addressing the design of the chip-collection openings and strictly limiting the cable-load drop with respect to the load at the start of the run.

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