Global Annual Freezing and Thawing Indices
Entry ID: NSIDC-0063

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Summary
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).

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Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: Zhang, T.
Dataset Title: Global Annual Freezing and Thawing Indices
Dataset Release Date: 1998-01-01
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Online Resource: http://nsidc.org/data/nsidc-0063.html


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Science Keywords
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE    [Definition]
CRYOSPHERE >SNOW/ICE >FREEZE/THAW    [Definition]
CRYOSPHERE >SNOW/ICE >PERMAFROST    [Definition]
LAND SURFACE >SOILS >PERMAFROST    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >FREEZE/THAW    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >PERMAFROST    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
IMAGERY/BASE MAPS/EARTH COVER
GEOSCIENTIFIC INFORMATION


Instrument
Thermistors    [Information]
Thermometers    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]


Keywords
Air Temperature
Cryosphere
Degree Days
Freeze
Frozen Ground
Frozen Soil
Ice Growth
Ice Melt
Permafrost
Snow Melt
Thaw


Data Set Progress
COMPLETE


Data Center
NSIDC Distributed Active Archive Center    [Information]
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Frozen Ground Data Center    [Information]
Data Center URL: http://nsidc.org/fgdc/

Data Center Personnel
Name: NSIDC FGDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA



Distribution
Distribution_Media: FTP


Personnel
TINGJUN ZHANG
Role: INVESTIGATOR
Phone: 303-492-6199
Fax: 303-492-2359
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
University of Colorado
CIRES, 449 UCB
City: Boulder
Province or State: Colorado
Postal Code: 80309-0449
Country: USA


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Legates, D. R. and C. J. Willmott, 1990: Mean Seasonal and Spatial Variability in Global Surface Air Temperature, Theoretical and Applied Climatology, 41(1-2).

Creation and Review Dates
DIF Creation Date: 1998-01-01
Last DIF Revision Date: 2013-08-15

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