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Clow, Gary D (1999): GISP2-D Borehole Diameter. PANGAEA, https://doi.org/10.1594/PANGAEA.56090

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Related to:
Clow, Gary D; Saltus, Richard W; Waddington, Edwin D (1996): A new high-precision borehole-temperature logging system used at GISP2, Greenland, and Taylor Dome, Antarctica. Journal of Glaciology, 42, 576-584
GRIP/GISP (1997): The Greenland Summit Ice Cores CD-ROM GISP2/GRIP. National Snow and Ice Data Center, University of Colorado at Boulder, and World Data Center for Paleoclimatology, National Geophysical Data Center, Boulder Colorado, CD-ROM, http://store.pangaea.de/Projects/GRIP-GISP/grip-gisp.iso
Project(s):
Greenland Ice Core Projects (GRIP/GISP/NGRIP)
Coverage:
Latitude: 72.588000 * Longitude: -38.457000
Minimum DEPTH, ice/snow: 74.3200 m * Maximum DEPTH, ice/snow: 3045.9000 m
Event(s):
GISP2-D * Latitude: 72.588000 * Longitude: -38.457000 * Elevation Start: 3203.0 m * Elevation End: 0.0 m * Campaign: GISP * Basis: Sampling/drilling ice * Method/Device: Drilling/drill rig (DRILL) * Comment: The length of the 3-km borehole at the GISP2 site was measured by two completely independent geophysical logging systems, the University of Copenhagen system (UCPH) and the U.S. Geological Survey's temperature system (USGS). Both systems utilized steel logging cables. The depth calibration factor for the UCPH system was determined from the measured length of the GRIP ice core while the USGS system was calibrated using a fiberglass tape measure with a low coefficient of thermal expansion. The accuracy of the depth measurements for both systems is estimated to be 2-3 m at a depth of 3 km. Inclination/azimuth measurements from the UCPH logger have been used to calculate the true vertical depth of the borehole from the measured total slant length. UCPH/true vertical depth (m):3047.8 slant length (m):3056.5 USGS/true vertical depth (m):3047.9, slant length (m):3056.6
Comment:
Depth=TVD true vertical depth. The diameter of the 3-km borehole (GISP-D) at the GISP2 site was measured during 1993, 1994, and 1995 using University of Copenhagens geophysical logging system (UCPH); the UCPH logging system is described in Gundestrup et al.(1994).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2Borehole, diameter, maximumHole diam maxmmClow, Gary DCaliper logging tool (CALI)
3Borehole, diameter, minimumHole diam minmmClow, Gary DCaliper logging tool (CALI)
Size:
7502 data points

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