Near-Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations  View Catalog Page Entry ID
NSIDC-0081
Summary
This data set provides a near-real-time (NRT) map of sea ice concentrations for both the Northern and Southern Hemispheres. The near-real-time passive microwave brightness temperature data are acquired with the Special Sensor Microwave Imager/Sounder (SSMIS) on board the Defense Meteorological Satellite Program (DMSP) F17 satellite. The SSMIS instrument is the next generation Special Sensor Microwave/Imager (SSM/I) instrument. SSMIS data are received daily from the Comprehensive Large Array-data Stewardship System (CLASS) at the National Oceanic and Atmospheric Administration (NOAA) and are gridded onto a polar stereographic grid. Investigators generate sea ice concentrations from these data using the NASA Team algorithm.
These data are stored as one-byte flat scaled binary arrays with one byte per pixel, at a resolution of 25 km. For each data file, a corresponding PNG image file is provided. These data are available via FTP for the most recent three to six months and are retained on the FTP site until NSIDC's Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data (preliminary data) become available for the same time period.
These data are primarily meant to provide a best estimate of current ice and snow conditions based on information and algorithms available at the time the data are acquired. Near-real-time products are not intended for operational use in assessing sea ice conditions for navigation and should be used with caution in extending the sea ice time series in NSIDC's Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data.
Multimedia Sample
View full image
Caption: Most recent sea ice concentration data for the Northern Hemisphere.
View full image
Caption: Most recent sea ice concentration data for the Southern Hemisphere.
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Geographic Coverage
Spatial Coordinates:
N: -39.23°
S: -90°
E: 180°
W: -180°
N: 90°
S: 30.98°
E: 180°
W: -180°
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Data Set Citation
Dataset Creator: Jim Maslanik
Dataset Title: Near-Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations
Dataset Release Date: 1999-01-01, updated daily
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Data Presentation Form: Digital media
Online Resource: http://nsidc.org/data/nsidc-0081.html
Temporal Coverage
Start Date: 1999-04-05
Data Resolution
Latitude Resolution: 25 km
Longitude Resolution: 25 km
Temporal Resolution: Daily
Location Keywords
- Continent Antarctica
- Geographic Region Arctic
- Geographic Region Polar
Science Keywords
- Cryosphere Sea Ice Sea Ice Concentration
- Oceans Sea Ice Sea Ice Concentration
Ancillary Keywords
- Antarctic
- Arctic
- DMSP
- Gridded Data
- Ice
- Ice Concentration
- Near Real-time
- Passive Microwave
- Polar
- Polar Stereographic
- Remote Sensing
- Sea Ice
- Sea Ice Concentration
- SMMR
- Special Sensor Microwave Imager/Sounder
- SSM/I
- SSMIS
- Climatology/Meteorology/Atmosphere
- Oceans
Platform
- DMSP 5D-2/F13 Defense Meteorological Satellite Program-F13
- DMSP 5D-2/F15 Defense Meteorological Satellite Program-F15
- DMSP 5D-3/F17 Defense Meteorological Satellite Program-F17
Instrument
- SSM/I Special Sensor Microwave/Imager
- SSMIS Special Sensor Microwave Imager/Sounder
Project
- EOSDIS Earth Observing System Data Information System
- ESIP Earth Science Information Partners Program
Quality
This near-real-time sea ice concentration (NRTSI) data set is created using brightness temperatures from NOAA's Comprehensive Large Array-data Stewardship System (CLASS) in order to provide the product within one to two days following data acquisition. These brightness temperatures do not receive the same level of quality control as the DMSP SSM/I Daily Polar Gridded Brightness Temperatures product created at NSIDC.
Additionally, these NRTSI data may be missing swaths and contain erroneous ice over ocean that was missed by the weather filters.
Use Constraints
These data are intended to facilitate time-sensitive research dependent upon precise detection of seasonal polar sea ice formation and break up. These data are primarily meant to provide a best estimate of current ice and snow conditions based on information and algorithms available at the time the data are acquired. Near real-time products are not intended for operational use in assessing sea ice conditions for navigation and should be used with caution in extending the sea ice time series. For historical SMMR and SSM/I sea ice concentration data, please see Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data.
Data Set Progress
IN WORK
Originating Center
NSIDC_DAAC
Data Center
National Snow and Ice Data Center
Data Center URL: http://nsidc.org
Data Set ID: NSIDC-0081
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
NSIDC Distributed Active Archive Center
Data Center URL: http://nsidc.org/daac/index.html
Data Set ID: NSIDC-0081
Data Center Personnel
Name: NSIDC DAAC 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
Distribution Format: PNG
Fees: none
Distribution Media: FTP
Distribution Size: 105212 bytes per southern file
Distribution Format: binary
Fees: none
Distribution Media: FTP
Distribution Size: 136492 bytes per northern file
Distribution Format: binary
Fees: none
Personnel
JIM MASLANIK
Role: INVESTIGATOR
Phone: (303) 492-6199
Fax: (303) 492-2468
Email: nsidc@kryos.colorado.edu
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309
Julienne Stroeve
Role: INVESTIGATOR
Email: stroeve@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
Kenneth W. Knowles
Role: INVESTIGATOR
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
Walt Meier
Role: INVESTIGATOR
Email: walt@nsidc.org
Contact Address:
449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309
Country: USA
DONALD CAVALIERI
Role: INVESTIGATOR
Phone: (301) 614-5901
Fax: (301) 614-5644
Email: don@cavalieri.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
NSIDC USER SERVICES
Role: TECHNICAL CONTACT
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
Related URL
GET DATA
FTP site for obtaining these data
GET SERVICE > GET WEB COVERAGE SERVICE (WCS)
Access the most current data in GeoTIFF format using the Open Geospatial Consortium (OGC) Web Coverage Service (WCS). A WCS for the Southern Hemisphere will be added soon.
GET SERVICE > GET WEB MAP SERVICE (WMS)
Access the most current Nothern Hemisphere data as a map image using the Open Geospatial Consortium (OGC) Web Map Service (WMS). A WMS for the Southern Hemisphere will be added soon.
VIEW RELATED INFORMATION
Near-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent
VIEW RELATED INFORMATION
Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data
Reference
Cavalieri, D. J., P. Gloersen, and W. J. Campbell. 1984. Determination of sea ice parameters with the NIMBUS-7 SMMR. Journal of Geophysical Research 89(D4):5355-5369.
Cavalieri, D. J., C. I. Parkinson, P. Gloersen, and H. J. Zwally. 1997. Arctic and Antarctic sea ice concentrations from multichannel passive-microwave satellite data sets: October 1978 to December 1996, User's Guide. NASA Technical Memorandum 104647. 17 pages.
For a complete list of references, see the References and Related Publications section in the documentation for NSIDC's Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data.
Metadata Name and Version
Metadata Name: CEOS IDN DIF
Metadata Version: 9.7
Creation and Review Dates
DIF Creation Date: 1999-07-14
Last DIF Revision Date: 2008-06-20
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