Nimbus-7 SMMR Polar Gridded Radiances and Sea Ice Concentrations

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Entry ID

NSIDC-0007

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.

Geographic Coverage

 

Spatial Coordinates:
N: -39°     S: -90°     E: 180°     W: -180°    
N: 90°     S: 30°     E: 180°     W: -180°    

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

Temporal Coverage

Start Date: 1978-10-25
Stop Date: 1987-08-20

Location Keywords

  • CONTINENT NORTH AMERICA CANADA HUDSON BAY
  • GEOGRAPHIC REGION POLAR
  • OCEAN ARCTIC OCEAN BAFFIN BAY
  • OCEAN ARCTIC OCEAN BEAUFORT SEA
  • OCEAN ARCTIC OCEAN CHUKCHI SEA
  • OCEAN ATLANTIC OCEAN NORTH ATLANTIC OCEAN
  • OCEAN ATLANTIC OCEAN NORTH ATLANTIC OCEAN GREENLAND SEA
  • OCEAN PACIFIC OCEAN NORTH PACIFIC OCEAN BERING SEA
  • OCEAN SOUTHERN OCEAN AMUNDSEN SEA

Science Keywords

  • Cryosphere Sea Ice Ice Extent
  • Cryosphere Sea Ice Sea Ice Concentration
  • Cryosphere Snow/Ice Ice Extent
  • Oceans Sea Ice Ice Extent
  • Oceans Sea Ice Sea Ice Concentration
  • Spectral/Engineering Microwave Brightness Temperature
  • Terrestrial Hydrosphere Snow/Ice Ice Extent

Ancillary Keywords

  • Antarctic
  • Arctic
  • CD-ROM
  • DAAC
  • EOSDIS
  • Global Change
  • Ice
  • NSIDC DAAC
  • Passive Microwave
  • Polar
  • Radiance
  • Remote Sensing
  • Sea Ice Concentration
  • Sea Ice Extent
  • Snow

Platform

  • NIMBUS-7

Instrument

  • RADIOMETERS
  • SMMR Scanning Multichannel Microwave Radiometer

Project

  • EOSDIS Earth Observing System Data Information System
  • ESIP Earth Science Information Partners Program

Data Set Progress

complete

Data Center

NASA DAAC at the National Snow and Ice Data Center
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@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
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@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

NSIDC User Services
Role: TECHNICAL CONTACT
Phone: 1 303 492-6199 x
Fax: 1 303 492-2468 x
Email: nsidc@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

Per Gloersen
Role: INVESTIGATOR
Phone: 1 301 614-5710
Fax: 1 301 614-5644
Email: per.gloersen@gsfc.nasa.gov
Contact Address:

  • Laboratory for Hydrospheric Processes
  • NASA/Goddard Space Flight Center
  • Code 971

City: Greenbelt
Province or State: MD
Postal Code: 20771

Per Gloersen
Role: INVESTIGATOR
Phone: 1 301 614-5710
Fax: 1 301 614-5644
Email: per.gloersen@gsfc.nasa.gov
Contact Address:

  • Laboratory for Hydrospheric Processes
  • NASA/Goddard Space Flight Center
  • Code 971

City: Greenbelt
Province or State: MD
Postal Code: 20771

Donald J. Cavalieri
Role: INVESTIGATOR
Phone: 1 301 614-5901 x
Fax: 1 301 614-5644 x
Email: Donald.J.Cavalieri@nasa.gov
Contact Address:

  • NASA Goddard Space Flight Center
  • Laboratory for Hydrospheric Processes
  • NASA/GSFC
  • Mail Code: 615

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Related URL

VIEW PROJECT HOME PAGE
Sea Ice Products at NSIDC

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.

Metadata Name and Version

Metadata Name: CEOS IDN DIF
Metadata Version: 9.7

Creation and Review Dates

DIF Creation Date: 2006-08-03
Last DIF Revision Date: 2013-08-26

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