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Clow, Gary D (2003): GISP2-D Borehole Geometry. PANGAEA,

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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, grip-gisp.iso
Gundestrup, Niels S; Clausen, Henrik Brink; Hansen, Bogi (1994): The UCPH borehole logger. Memoirs of the National Institute of Polar Research, Special Issue, 49, 224-233
Greenland Ice Core Projects (GRIP/GISP/NGRIP)
Latitude: 72.588000 * Longitude: -38.457000
Minimum DEPTH, ice/snow: 0.0000 m * Maximum DEPTH, ice/snow: 3047.7800 m
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
Inclination and azimuth was meas. 1993, 1994, 1995 using Univy of Copenhagens geophysical logging system (UCPH), described by Gundestrup et al., (1994). Continued measurements will reveal the rate at which the ice is deforming as a function of depth in the ice sheet; ice deformation measurements are needed to constrain ice dynamics models developed for the GISP2 and GRIP sites. Given the slow deformation rates at GISP2, these measurements will need to be continued through at least 1999. Depth is true vertical depth
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2North componentNorthmClow, Gary D
3West componentWestmClow, Gary D
4InclinationIncldegClow, Gary D
5AzimuthAzimdegClow, Gary D
6--Clow, Gary Dslant length measured along the borehole
670 data points

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