GGD223_1

Borehole locations and permafrost depths, Alaska, USA, Version 1

Version 1 eng; usa
  • Abstract
    The methods utilized by the U.S. Geological Survey to measure subsurface temperatures have evolved considerably over the years. Although some of the early measurements were obtained using thermistor strings frozen into permafrost, the vast majority of the measurements were made in fluid-filled holes using a custom temperature sensor. A typical sensor used in Alaska prior to 1989 consisted of a series-parallel network of 20 thermistors; see Sass et al. [1971] for a more detailed description. During a logging experiment, the resistance of the thermistor network was determined using a Wheatstone bridge prior to 1967. After that time, a 4-wire resistance measurement was made using a commercial 5.5-digit multimeter (DMM). Before 1984, boreholes were logged in the 'incremental' or 'stop-and-go' modes; the vertical spacing of the measurements was typically 3-15 m. Beginning in 1984, the depth/resistance measurements were automatically stored on magnetic tape, allowing boreholes to be logged in the 'continuous' mode; the typical data spacing for the continuous temperature logs was 0.3 m (1 ft). Many of the Alaskan boreholes were re-logged several times to quantify the thermal disturbance caused by drilling the holes (see Lachenbruch and Brewer [1959]). A review of current temperature measuring techniques used by the USGS in the polar regions is given by Clow et al. [1996]. Data from 1950-1989 are included on the CAPS CD-ROM Version 1.0, June 1998.
  • Purpose
    Scientific Research

Data Identification Fields:

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    Processing Level

    Not Applicable

    Quality
    Collection Progress

    Complete

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • Cryosphere
    • Frozen Ground
    • Permafrost
    • EARTH SCIENCE
    • Land Surface
    • Frozen Ground
    • Permafrost
    • EARTH SCIENCE
    • Cryosphere
    • Frozen Ground
    • Soil Temperature
    • EARTH SCIENCE
    • Land Surface
    • Frozen Ground
    • Soil Temperature

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    Instruments

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Continent
    • North America
    • United States Of America
    • Arctic Alaska, USA

Data Centers

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  • National Snow and Ice Data Center
    ARCHIVER

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • National Snow and Ice Data Center
    DISTRIBUTOR

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Data Contacts

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  • Gary
    Technical Contact
    Gary Clow

    Denver Federal Center, Box 25046, MS980
    Denver, CO 80225

    • 1 303 236 5509
    • 1 303 236 5349
    • Email
  • Max
    Technical Contact
    Max Brewer

    4200 University Drive
    Anchorage, AK 99508

    • 1 907 786 7429
    • 1 907 786 7429
  • Arthur
    Technical Contact
    Arthur Lachenbruch

    345 Middlefield Road, MS 977
    Menlo Park, CA 94025

  • Clow,
    Technical Contact
    Clow, G.D

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  • National Snow and Ice Data Center
    User Services
    National Snow and Ice Data Center

    Boulder, Colorado

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    Collection Citations
    • Borehole locations and permafrost depths, Alaska, USA, Version 1
      1

      Published by: National Snow and Ice Data Center