GISP2-D_tempertr.tab (3.8 kB)

GISP2-D Temperature

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dataset
posted on 20.11.2019 by Gary D Clow
Depth is true vertical depth. Sample spacing for the primary temp logs is 20 cm, accuracy is 4.5mK. The "uncorrected" data were obtained on 14June1995. Quality is insuff for borehole thermometry studies.

History

Year

1999

Size

31 data points

Coverage

* Latitude: 72.588 * Longitude: -38.457 * Minimum DEPTH, ice/snow: 100.0m * Maximum DEPTH, ice/snow: 100.0m

Event(s)

GISP2-D * Latitude: 72.588 * Longitude: -38.457 * Elevation: 3203.0 * Campaign: GISP * Basis: Sampling/drilling ice * 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

Project(s)

Greenland Ice Core Projects (GRIP/GISP/NGRIP)

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, Clow, Gary D; Saltus, Richard W; Waddington, Edwin D (1995): High-precision temperature logging at GISP2, Greenland, May 1992. U.S. Geological Survey Open-File Report, 95-490, 490 pp, https://pubs.usgs.gov/of/1995/0490/report.pdf Cuffey, Kurt M; Clow, Gary D; Alley, Richard B; Stuiver, Minze; Waddington, Edwin D; Saltus, Richard W (1995): Large Arctic Temperature Change at the Wisconsin-Holocene Glacial Transition. Science, 270(5235), 455-458, https://doi.org/10.1126/science.270.5235.455 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 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, Saltus, Richard W; Clow, Gary D (1994): Deconvolution of continuous borehole temperature logs: Example from the Greenland GISP2 icecore hole. U.S. Geological Survey Open-File Report, 94-254, 254 pp, https://pubs.usgs.gov/of/1994/0254/report.pdf

Comment

Depth is true vertical depth. Sample spacing for the primary temp logs is 20 cm, accuracy is 4.5mK. The "uncorrected" data were obtained on 14June1995. Quality is insuff for borehole thermometry studies.

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