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The investigation and experience of using ESTISOL™ 240 and COASOL™ for ice-core drilling

  • Simon G. Sheldon (a1), Jørgen P. Steffensen (a1), Steffen B. Hansen (a1), Trevor J. Popp (a1) and Sigfús J. Johnsen (a1)...

Abstract

Continuous good-quality deep ice cores provide excellent scientific data with which to reconstruct a past climate record for >800 ka. At depths starting from ∼100m using an electromechanical drill, a drilling liquid is essential for successful recovery of the very high-quality ice cores demanded by modern scientific analysis techniques (e.g. continuous flow analysis). Finding a suitable drill fluid for use at deep ice-coring drill sites is not an easy task. Temperatures vary greatly not just from site to site, but also at a site where the average mean temperature from surface to bedrock can vary from –55°C to –2.75°C. In the past 60 years, many fluids have been used, with varying degrees of success, but for various reasons are either unavailable, are now considered unsafe and dangerous or are too environmentally damaging to be permitted. Here we report on our pre-season investigation into possible candidate drill fluids, with specific information concerning ESTISOL™ 240 and COASOL™, the rationale behind the redesign of our drill successfully used at NorthGRIP, Greenland, and EPICA DML, Antarctica, the knock-on effect of those changes, and our field experience in Greenland at Flade Isblink in 2006 and at NEEM in 2009–10.

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References

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Dahl-Jensen, D and 6 others (1998) Past temperatures directly from the Greenland ice sheet. Science, 282(5387), 268271 (doi: 10.1126/science.282.5387.268)
Gerasimoff, M (2003) Drilling fluid observations and recommendations for U.S. Polar Program, Waiscores Drilling Project. (Internal Report) Space Science and Engineering Center, University of Wisconsin–Madison, Madison, WI http://icedrill.org/Documents/Download.pm?DOCUMENT_ID=50
Gundestrup, NS, Clausen, HB, Hansen, SB and Johnsen, SJ (1994) Hole liquids and gaskets for the ISTUK deep ice core drill. Mem. Natl Inst. Polar Res., Special Issue 49, 327334
Harrison, WD and Raymond, CF (1976) Impurities and their distribution in temperate glacier ice. J. Glaciol., 16(74), 173181
Popp, TJ, Hansen, SB, Sheldon, SG and Panton, C (2014a) Deep ice-core drilling performance and experience at NEEM, Greenland. Ann. Glaciol., 55(68) (doi: 10.3189/2014AoG68A042) (see paper in this issue)
Popp, T, Hansen, S, Sheldon, SG, Schwander, J and Panton, C (2014b) Drilling into debris-rich basal ice at the bottom of the NEEM (Greenland) borehole. Ann. Glaciol., 55(68) (doi: 10.3189/2014AoG68A029) (see paper in this issue)
Talalay, PG and Gundestrup, NS (2002) Hole fluids for deep ice core drilling. Mem. Natl Inst. Polar Res., Special Issue 56, 148170
Vasiliev, NI and Kudryashov, BB (2002) Hydraulic resistance to movement of a drill suspended by a cable in a bore-hole in travels. Mem. Natl Inst. Polar Res., Special Issue 56, 142147

Keywords

The investigation and experience of using ESTISOL™ 240 and COASOL™ for ice-core drilling

  • Simon G. Sheldon (a1), Jørgen P. Steffensen (a1), Steffen B. Hansen (a1), Trevor J. Popp (a1) and Sigfús J. Johnsen (a1)...

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