Entry_ID: G00917
Entry_Title: NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990
Group: Data_Set_Citation
   Dataset_Creator: Ropelewski, C. F. 
   Dataset_Title: NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990
   Dataset_Release_Date: 1983-01-01updated 1990
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/g00917.html
   Dataset DOI: http://dx.doi.org/10.7265/N5Z60KZ1
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Chester
   Middle_Name: F.
   Last_Name: Ropelewski
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: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Ice Extent
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Ice Extent
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Sea Ice Concentration
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
ISO_Topic_Category: Oceans
Keyword: Antarctic
Keyword: Arctic
Keyword: Gridded Data
Keyword: Model Input Data
Sensor_Name: DIGITIZER
Sensor_Name: VISUAL OBSERVATIONS
Source_Name: AIRCRAFT
Source_Name: GROUND-BASED OBSERVATIONS
Source_Name: GROUND STATIONS
Source_Name: SATELLITES
Source_Name: SHIPS
Group: Temporal_Coverage
   Start_Date: 1973-01-31
   Stop_Date: 1990-08-31
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -90
   Northernmost_Latitude: -50
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: 50
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: POLAR
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: ARCTIC OCEAN
   Detailed_Location: BAFFIN BAY
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: ARCTIC OCEAN
   Location_Subregion1: BEAUFORT SEA
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: ARCTIC OCEAN
   Location_Subregion1: CHUKCHI SEA
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: ATLANTIC OCEAN
   Detailed_Location: NORTH ATLANTIC OCEAN
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: PACIFIC OCEAN
   Location_Subregion1: NORTH PACIFIC OCEAN
   Location_Subregion2: BERING SEA
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: SOUTHERN OCEAN
   Detailed_Location: AMUNDSEN SEA
End_Group
Group: Quality

   The weekly chart dated closest to the end of the month was selected to 
   represent the sea ice for that month, because it was not practical to analyze 
   each of the weekly charts. This introduces error, or noise, into these 
   estimates for year-to-year comparisons (Ropelewski, 1983). No quality 
   assessment or quality control has been performed on these data at NSIDC.

End_Group
Data_Set_Language: English
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: NOAA @ NSIDC > National Oceanic and Atmospheric Administration
   Data_Center_URL: http://nsidc.org/noaa/
   Group: Personnel
      Role: Data Center Contact
      First_Name: NOAA
      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
End_Group
Group: Reference

   Ropelewski, C.F. 1983. Spatial and temporal variations in Antarctic sea ice 
   (1973-82). Journal of Climate and Applied Meteorology. 22,470-473.

End_Group
Group: Summary

   Sea ice extent from January 1973 through August 1990 was digitized from weekly 
   operational sea ice charts produced by the Navy/NOAA Joint Ice Center. Charts 
   were digitized by hand using a 1 degree latitude x 2.5 degrees longitude grid. 
    The grid boxes were then summed in 1 degree latitude  x 10 degrees longitude 
   slices, and the ice covered area computed. The data represent the extent of 
   sea ice at the end of each month, given for 36 10-degree longitudinal sectors 
   in each hemisphere. Data were provided by the NOAA National Weather Service 
   National Meteorological Center (NMC) Climate Analyses Center (CAC).

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/seaice/
   Description: Sea Ice Products at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/g00917.html
   Description: Access to NMC/CAC sea ice information and data
End_Group
IDN_Node: USA/NOAA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 1983-01-01
Last_DIF_Revision_Date: 2013-08-05
DIF_Revision_History:  Fixing error in summary, no QC needed.