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Wilhelms, Frank; Miller, Heinz; Gerasimoff, Michael D; Drücker, Cord; Frenzel, Andreas; Fritzsche, Diedrich; Grobe, Hannes; Hansen, Steffen Bo; Hilmarsson, Sverrir Æ; Hoffmann, Georg; Hörnby, Kerstin; Jaeschke, Andrea; Jakobsdottir, Steinunn S; Juckschat, Paul; Karsten, Achim; Karsten, Lorenz; Kaufmann, Patrik R; Karlin, Torbjörn; Kohlberg, Eberhard; Kleffel, Guido; Lambrecht, Anja; Lambrecht, Astrid; Lawer, Gunther; Schärmeli, Ivan; Schmitt, Jochen; Sheldon, Simon G; Takata, Morimasa; Trenke, Marcus; Twarloh, Birthe; Valero-Delgado, Fernando; Wilhelms-Dick, Dorothee (2014): EPICA Dronning Maud Land EDML ice core drilling protocol. PANGAEA, https://doi.org/10.1594/PANGAEA.841035, Supplement to: Wilhelms, F et al. (2014): The EPICA Dronning Maud Land deep drilling operation. Annals of Glaciology, 55(68), 355-366, https://doi.org/10.3189/2014AoG68A189

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Abstract:
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. core-break 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.
Further details:
Talalay, Pavel G (2014): Drill heads of the deep ice electromechanical drills. Cold Regions Science and Technology, 97, 41-56, https://doi.org/10.1016/j.coldregions.2013.09.009
Coverage:
Latitude: -75.002500 * Longitude: 0.068400
Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2006-01-17T00:00:00
Minimum DEPTH, ice/snow: 91.54 m * Maximum DEPTH, ice/snow: 2761.77 m
Event(s):
EDML (EPICA Dronning Maud Land, DML28C01_00) * Latitude: -75.002500 * Longitude: 0.068400 * Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2006-01-17T00:00:00 * Elevation: 2891.7 m * Recovery: 2774.15 m * Campaign: EPICA-Campaigns * Basis: Kohnen Station * Method/Device: EPICA drill (EDRILL) * Comment: Elevation is given with reference to WGS84
Comment:
DEPTH, ice/snow [m] = Drilled depth, measured cable length. For offset to core depth refer to reference.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1RunRunWilhelms, FrankThe run number, without prefix drilling run, "FR": filter run, "RR": reaming run, "START": start of season, "END": end of season
2Run Date/TimeRun Date/TimeWilhelms, FrankDate/Time when run was started (GMT)
3Core lengthCore lengthcmWilhelms, FrankTotal length of fitted core pieces immediately after core retrieval
4Numbern#Wilhelms, FrankNumber of core pieces counted immediately after core retrieval
5Break strengthBreak strdaNWilhelms, FrankForce needed to break the core as recorded with a load cell in the top tower wheel
6MassMasskgWilhelms, FrankWeight of the spin extractor dried chips. See reference for the residual liquid content.
7DEPTH, ice/snowDepth ice/snowmGeocode
8CommentCommentWilhelms, FrankSpecial remarks on the run
9CommentCommentWilhelms, FrankSpecial remarks related to the electronics
10CommentCommentWilhelms, FrankSpecial remarks related to the pump
11Pitch, lower limitPitch lowmmWilhelms, FrankMinimal distance between 3 grooves on the core surface (P.G. Talalay, 2014)
12Pitch, upper limitPitch upmmWilhelms, FrankMaximal distance between 3 grooves on the core surface (P.G. Talalay, 2014)
13LevelLevelmWilhelms, FrankDrilled depth when the top of the drilling liquid column is reached. See reference for details.
14VolumeVolm3Wilhelms, FrankThe volume of the drilling liquid pumped into the hole measured with a flow meter
15Density, mass densityDensitykg/m3Wilhelms, FrankThe density of the drilling liquid pumped to the hole simultaneosly measured with an aerometer and an alcohol thermometer
16Temperature, technicalT tech°CWilhelms, FrankThe temperature of the drilling liquid pumped to the hole simultaneosly measured with an aerometer and an alcohol thermometer
Size:
14880 data points

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