Entry_ID: GGD650
Entry_Title: Northern Hemisphere Seasonal and Intermittent Frozen Ground Areas 1901-2001
Group: Data_Set_Citation
   Dataset_Creator: T. Zhang, J. Smith
   Dataset_Title: Northern Hemisphere Seasonal and Intermittent Frozen Ground Areas 1901-2001
   Dataset_Release_Date: 2006-01-01
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/ggd650.html
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Tingjun
   Middle_Name: Z
   Last_Name: Zhang
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2359 x
   Group: Contact_Address
      Address: University of Colorado
      Address: National Snow and Ice Data Center/World Data Center for Glaciology
      Address: UCB449
      City: Boulder
      Province_or_State: Colorado
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Frozen Ground
   Variable_Level_1: Seasonally Frozen Ground
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Frozen Ground
   Variable_Level_1: Seasonally Frozen Ground
   Detailed_Variable: Freezing/Thawing Index
End_Group
ISO_Topic_Category: Geoscientific Information
Keyword: intermittently frozen ground
Group: Temporal_Coverage
   Start_Date: 1901-01-01
   Stop_Date: 2002-12-31
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: 0
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: ARCTIC
End_Group
Group: Data_Resolution
   Latitude_Resolution: 25 km
   Longitude_Resolution: 25 km
   Temporal_Resolution: 1 year
End_Group
Data_Set_Language: English
Originating_Center: FGDC
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: FGDC > Frozen Ground Data Center
   Data_Center_URL: http://nsidc.org/fgdc/
   Group: Personnel
      Role: Data Center Contact
      First_Name: FGDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 x
      Fax: 1 303  492-2468 x
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 20 KB
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: Reference

   Zhang, T., R. G. Barry, K. Knowles, F. Ling, and R. L. Armstrong. 2003. 
   Distribution of seasonally and perennially frozen ground in the Northern 
   Hemisphere. in Phillips, M., S. M. Springman, and L. U. Arenson (editors). 
   2003. Permafrost: Proceedings of the Eighth International Conference on 
   Permafrost, 21-25 July 2003, Zurich, Switzerland. Lisse, The Netherlands: A.A. 
   Balkema. Mitchell T. D. and P. D. Jones. 2005. An improved method of 
   constructing a database of monthly climate observations and associated 
   high-resolution grids. International Journal of Climatology 25, 693-712.

End_Group
Group: Summary

   This data set contains monthly values of the total exposed land area of 
   seasonally frozen ground and  annual values for intermittently frozen ground 
   in the Northern Hemisphere. Seasonally frozen ground is  defined as the 
   near-surface soil that experiences freeze for more than 15 days per year, 
   while intermittently frozen ground experiences fewer than 15 days of freeze 
   per year. The values were  calculated based upon the monthly mean air 
   temperature from the 1901-2002, 0.5 deg. global land  temperatures from the 
   University of East Anglia Climate Research Unit (Mitchell and Jones, 2005) 
   using  the technique described by Zhang, et al. (2003).

   Two ASCII files are available. One file contains monthly values of seasonally 
   frozen ground area in  square kilometers for 1901-2001. The other file 
   contains annual values of intermittently frozen ground  area. Data are 
   available via FTP.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/ease/index.html
   Description: All About EASE-Grid
End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2006-01-01
Last_DIF_Revision_Date: 2012-09-18
DIF_Revision_History: deleted dupe URL in Related URL field