Entry_ID: NSIDC-0007
Entry_Title: Nimbus-7 SMMR Polar Gridded Radiances and Sea Ice Concentrations
Group: Data_Set_Citation
   Dataset_Creator: Gloersen, P. 
   Dataset_Title: Nimbus-7 SMMR Polar Gridded Radiances and Sea Ice Concentrations
   Dataset_Release_Date: 2006-08-03
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0007.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: Per
   Last_Name: Gloersen
   Email: per.gloersen@gsfc.nasa.gov
   Phone: 1 301 614-5710 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Per
   Last_Name: Gloersen
   Email: per.gloersen@gsfc.nasa.gov
   Phone: 1 301 614-5710 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Donald
   Middle_Name: J.
   Last_Name: Cavalieri
   Email: Donald.J.Cavalieri@nasa.gov
   Phone: 1 301 614-5901 x
   Fax: 1 301  614-5644 x
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/GSFC
      Address: Mail Code: 615
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      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: 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: Sea Ice Concentration
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Spectral/Engineering
   Term: Microwave
   Variable_Level_1: Brightness Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Extent
End_Group
Keyword: Antarctic
Keyword: Arctic
Keyword: CD-ROM
Keyword: DAAC
Keyword: EOSDIS
Keyword: Global Change
Keyword: Ice
Keyword: NSIDC DAAC
Keyword: Passive Microwave
Keyword: Polar
Keyword: Radiance
Keyword: Remote Sensing
Keyword: Sea Ice Concentration
Keyword: Sea Ice Extent
Keyword: Snow
Sensor_Name: RADIOMETERS
Sensor_Name: SMMR > Scanning Multichannel Microwave Radiometer
Source_Name: NIMBUS-7
Group: Temporal_Coverage
   Start_Date: 1978-10-25
   Stop_Date: 1987-08-20
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -90
   Northernmost_Latitude: -39
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: 30
   Northernmost_Latitude: 90
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: NORTH AMERICA
   Location_Subregion1: CANADA
   Location_Subregion2: HUDSON BAY
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: 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: Location
   Location_Category: OCEAN
   Location_Type: SOUTHERN OCEAN
   Detailed_Location: AMUNDSEN SEA
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
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: Distribution
   Distribution_Media: FTP
End_Group
Group: Reference

   Carsey, F.D., ed., Microwave remote sensing of sea ice. Geophysical Monograph 
   68, American Geophysical Union, 1992.

   Cavalieri, D.J., P. Gloersen and W.J. Campbell, Determination of sea ice 
   parameters with the Nimbus-7 SMMR, J. Geophys. Res. 89(D4):5355-5369, 1984.

   Comiso, J.C. and H.J. Zwally, Polar microwave brightness temperatures from 
   Nimbus-7 SMMR: Time series of daily and monthly maps from 1978 to 1987. NASA. 
   Reference Publication, 1223, 82 p.,1989. Francis, E.A., Calibration of the 
   Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), 1979-1984, Oregon 
   State University, M.S. thesis, 248 p., 1987.

   Gloersen, P., In-orbit calibration adjustment of the Nimbus-7 SMMR. NASA 
   Technical Memorandum 100678, 39 p, 1987.

   Gloersen, P. and D.J. Cavalieri, Reduction of weather effects in the 
   calculation of sea ice concentration from microwave radiances. J. of Geophys. 
   Res. 91(C3):3913-3919, 1986.

   Gloersen, P., W.J. Campbell, D.J. Cavalieri, J.C. Comiso, C.L. Parkinson and 
   H.J. Zwally. Arctic and Antarctic Sea Ice, 1978-1987: Satellite Passive 
   Microwave Observations. NASA SP-511, 1992.

   National Snow and Ice Data Center, Nimbus-7 SMMR Polar Radiances and Sea Ice 
   Concentrations on CD-ROM. User's Guide. NSIDC, Special Publication NSIDC SP-3, 
   Boulder, CO, 1994.

   Nimbus-7 User's Guide. NASA, Goddard Space Flight Center, 263 p., 1978.

End_Group
Group: Summary

   This data set contains gridded brightness temperatures and sea ice 
   concentrations for both polar regions. It spans the period from October 1978 
   through August 1987, when the Nimbus-7 SMMR scanner was turned off. The data 
   were collected every other day at 6.60, 10.69, 18.00, 21.00 and 37.00 GHz. Due 
   to spacecraft power limitations, the scanner operated only on alternate days. 
   There are usually at least foutreen days of coverage per month, although major 
   data gaps occurred during the month of August. In August 1982, the following 
   days are missing for both polar regions: 4th, 8th, and 16th; in August 1984, 
   the 13th through the 23rd are missing for both polar regions; and in August 
   1985, the 6th through 8th are missing for the Southern Hemisphere.

   Brightness temperature and sea ice concentration grids have 25 x 25 km grid 
   elements in polar stereographic projection. Volume 7 contains all SMMR sea ice 
   concentrations for both polar regions, plus five months of brightness 
   temperature grids for the North polar region.

   Brightness temperature grids are stored as 16-bit integers, one day of 
   brightness temperature data is 0.27 mbytes for the North polar region, 0.21 
   mbytes for the South. Ice grids are stored as 8-bit integers. Files contain 
   136192 bytes and 104912 bytes for the North and South respectively. The NASA 
   Team Algorithm (Cavalieri et al. 1984, Gloersen and Cavalieri 1986) was used 
   to calculate ice concentrations from the brightness temperatures. The data 
   were produced by Dr. P. Gloersen, NASA/GSFC, Oceans and Ice Branch, and are 
   available via FTP.

   Notice to Data Users: SMMR TCT tapes comprised the input data set, unlike the 
   SMMR Digital Media product distributed by NSIDC in 1979.

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
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2006-08-03
Last_DIF_Revision_Date: 2013-08-26
DIF_Revision_History:  updated version number to 1