NSIDC-0063_1

Global Annual Freezing and Thawing Indices, Version 1

Version 1 eng; usa
  • Abstract
    The total annual freezing and thawing indices are defined as the cumulative number of degree-days when air temperatures are below and above zero degrees Celsius. The total annual freezing index has been widely used to predict permafrost distribution; estimate the maximum thickness of sea, lake, and river ice, and the maximum depth of ground-frost penetration; and classify snow types. The annual total thawing index has been used to predict permafrost distribution and to estimate the maximum depth of thaw in frozen ground. Both total freezing and thawing indices are important parameters for engineering design in cold regions. Data coverage is global. The data set contains the total annual freezing and thawing indices with a spatial resolution of 0.5 degrees latitude by 0.5 degrees longitude. Two data files are available, for the freeze and thaw indices respectively, in flat binary format. Each file is approximately 1 MB in size. The total annual freezing and thawing indexes were calculated based upon the monthly mean air temperature by Legates and Willmott (1990).
  • Purpose
    Scientific Research

Data Identification Fields:

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    Processing Level

    Level 3

    Quality
    Collection Progress

    Complete

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • Atmosphere
    • Atmospheric Temperature
    • Air Temperature
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Freeze/Thaw
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Freeze/Thaw
    • EARTH SCIENCE
    • Land Surface
    • Soils
    • Permafrost
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Permafrost
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Permafrost

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  • Not provided
    Instruments

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Geographic Region
    • Global

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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  • Tingjun
    Technical Contact
    Tingjun Zhang

    UCB449
    Boulder, Colorado 80309-0449

    • 1 303 492 6199
    • 1 303 492 2359
    • Email
  • Zhang,
    Technical Contact
    Zhang, T.

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

    Boulder, Colorado

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  • NSIDC
    Data Center Contact
    NSIDC Services

    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
  • NSIDC
    Data Center Contact
    NSIDC Services

    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

Collection Citations Fields:

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    Collection Citations
    • Global Annual Freezing and Thawing Indices, Version 1
      1

      Published by: National Snow and Ice Data Center