Entry_ID: NSIDC-0050
Entry_Title: AARI 10-Day Arctic Ocean EASE-Grid Sea Ice Observations
Group: Data_Set_Citation
   Dataset_Creator: Fetterer, F. 
   Dataset_Title: AARI 10-Day Arctic Ocean EASE-Grid Sea Ice Observations
   Dataset_Release_Date: 1997-06-15
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0050.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Florence
   Last_Name: Fetterer
   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
   End_Group
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: Ice Growth/Melt
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Ice Types
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Sea Ice Age
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: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Extent
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: Ice Types
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Polynyas
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Sea Ice Age
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Extent
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
ISO_Topic_Category: Oceans
Keyword: Arctic
Keyword: ICE CHARTS
Keyword: Ice Form
Keyword: North Polar Basin
Keyword: Sea Ice Concentration
Keyword: Sea Ice Extent
Keyword: Sea Ice Form
Keyword: Sea Ice Stage Of Development
Keyword: Stage Of Development
Sensor_Name: DIGITIZER
Group: Temporal_Coverage
   Start_Date: 1953-01-01
   Stop_Date: 1990-12-30
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: 45
   Northernmost_Latitude: 90
   Westernmost_Longitude: -130
   Easternmost_Longitude: 105
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: 68
   Northernmost_Latitude: 90
   Westernmost_Longitude: -24
   Easternmost_Longitude: 110
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: ARCTIC OCEAN
   Detailed_Location: BARENTS SEA
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: ATLANTIC OCEAN
   Location_Subregion1: NORTH ATLANTIC OCEAN
   Detailed_Location: GREENLAND SEA
End_Group
Group: Location
   Location_Category: OCEAN
   Location_Type: PACIFIC OCEAN
   Location_Subregion1: NORTH PACIFIC OCEAN
   Location_Subregion2: BERING SEA
End_Group
Group: Data_Resolution
   Latitude_Resolution: 12.5 km
   Longitude_Resolution: 12.5 km
   Temporal_Resolution: 10 days
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Group: Quality

   It is impossible to assess errors that might have occurred in translating ice 
   observations to the original operational charts and to SIGRID files, since 
   these steps were performed at AARI.  However, AARI estimates that ice edge 
   boundaries are generally accurate to between 2 and 10 km under typical ice 
   reconnaissance conditions, and to within 50 km under the worst conditions.

   Quality control routines assessed the 'correctness' of the AARI coding (i.e., 
   checked whether the AARI implementation of SIGRID matched the published 
   standard). Few errors were found in AARI's coding of the files.

End_Group
Access_Constraints: These data are freely available to the public.
Use_Constraints: None.
Data_Set_Language: English
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   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: 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 > 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: Reference

   Bushuev, A. V., R. G. Barry, V. M. Smolyanitsky, and V. J. Troisi. 1994. 
   Format to Provide Sea Ice Data for the World Climate Program (SIGRID-2). 
   Unpublished report to the World Meteorological Organization Commission for 
   Marine Meteorology.

   Environment Canada. 1989. Ice Charts: WMO Symbols for the Hatching of Total 
   Concentration of Ice. Manual of Standard Procedures for Observing and 
   Reporting Ice Conditions.  Atmospheric Environment Service, Ottawa Ontario. p. 
   3-21 - 3-31.

   Environment Canada. 1992. Ice Terminology: Ice Codes and Symbols, Egg Code. 
   MANIS, Manual of Ice Services.  Atmospheric Environment Service. Ottawa, 
   Ontario. sect. A.3.

   Kokaly, Raymond F. 1996. Format for Gridded Sea Ice Information (SIGRID). 
   Special Report to the National Snow and Ice Data Center, Boulder, Colorado.

   Kokaly, Raymond F. 1996. An Evaluation of the Results from Using Nearest 
   Neighbor and Area Min/Max Resampling Methods to Regrid AARI Digitized Sea Ice 
   Charts to EASE-Grid.  Special Report to theNational Snow and Ice Data Center, 
   Boulder, Colorado.

   Thomas Thompson. 1981. Proposed Format for Gridded Sea Ice Information 
   (SIGRID). Unpublished report prepared for the World Climate Programme.

End_Group
Group: Summary

   NOTE: This data set has been 
   replaced by the Sea Ice Charts of 
   the  Russian Arctic in Gridded Format, 1933-2006 data set.

   These gridded ice charts represent a reformatting of information contained in 
   another data set, the Russian Arctic and Antarctic Research Institute's (AARI) 
   10 Day Digital Arctic Sea Ice Charts. AARI digitized Arctic sea ice 
   concentration and stage of development charts as part of an international data 
   exchange program. The AARI source charts, similar to operational charts 
   distributed by the National Ice Center describing ice type and constitution, 
   were developed from aircraft and satellite observations for shipping purposes, 
   and provide extremely detailed information.  Such data are particularly valued 
   in process studies tracking the growth and recession of polynyas, or for 
   looking at the preponderance of ice at certain stages of development in a 
   particular area. NSIDC does not maintain the operational charts, but archives 
   the AARI digitized version. However, the Arctic and Antarctic Research 
   Institute (AARI) 10  Day Digital Arctic Sea Ice Charts were encoded in SIGRID 
   (Sea Ice Grid) format, which assigns numerical values to ice parameters and 
   records them at specific lat/lon grid points. But due to the difficulties of 
   visualizing, extracting and working with data in SIGRID,  NSIDC is now 
   providing AARI data in NSIDC's Equal Area SSM/I Earth Grid.

   The EASE-Grid format makes it especially easy to compare observed ice 
   concentrations or ice types with the same parameters derived from satellite 
   data (such as ice concentrations from passive microwave sensors).

   AARI sea ice data in the EASE-Grid projection are gridded at a 12.5 km 
   resolution, for both Western (24W to 110E) and Eastern (105E to 130W) sectors 
   . Data extend from 1953 through 1990, and are available via ftp in compressed 
   tar format. Postscript (.ps) files depicting coverage per year are also 
   provided with the data.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/noaa/gdsidb/
   Description: Global Digital Sea Ice Data Bank (GDSIDB)
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/ease/
   Description: All About EASE-Grid
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/g02172.html
   Description: National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/g02176.html
   Description: Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006
End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 1997-06-15
Last_DIF_Revision_Date: 2013-03-12
Group: DIF_Revision_History

    Removed documentation link to replacement data set because that field is 
   strictly for the current data set. The link to the replacement data set is 
   highlighted in red in the summary, instead.

End_Group