NSIDC-0081 Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations Jim Maslanik Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations 1999-01-01updated daily Boulder, Colorado USA NSIDC: National Snow and Ice Data Center http://nsidc.org/data/nsidc-0081.html Investigator Jim Maslanik nsidc@kryos.colorado.edu 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309 Investigator Julienne Stroeve stroeve@nsidc.org

CIRES

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309 Investigator Kenneth Knowles

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA Investigator Walt Meier walt@nsidc.org

CIRES

National Snow and Ice Data Center

449 UCB

University of Colorado

Boulder CO 80309 USA Investigator Donald J. Cavalieri Donald.J.Cavalieri@nasa.gov 1 301 614-5901 x 1 301 614-5644 x

NASA Goddard Space Flight Center

Laboratory for Hydrospheric Processes

NASA/GSFC

Mail Code: 615

Greenbelt MD 20771 USA Technical Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 x 1 303 492-2468 x

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA EARTH SCIENCE Cryosphere Sea Ice Sea Ice Concentration EARTH SCIENCE Cryosphere Sea Ice Sea Ice Concentration EARTH SCIENCE Oceans Sea Ice Sea Ice Concentration EARTH SCIENCE Oceans Sea Ice Sea Ice Concentration Climatology/Meteorology/Atmosphere Oceans 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 SSM/I Special Sensor Microwave/Imager SSMIS Special Sensor Microwave Imager/Sounder 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 2012-01-01 2013-05-19 2012-01-01 2013-05-19 in work -90 -39.23 -180 180 30.98 90 -180 180 CONTINENT ANTARCTICA GEOGRAPHIC REGION ARCTIC GEOGRAPHIC REGION POLAR 25 km 25 km 1 day EOSDIS Earth Observing System Data Information System ESIP Earth Science Information Partners Program 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-SSMIS 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. 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. English NSIDC_DAAC NSIDC_DAAC NASA DAAC at the National Snow and Ice Data Center http://nsidc.org/daac/index.html Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA NSIDC National Snow and Ice Data Center http://nsidc.org Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA FTP PNG FTP 102.7 KB Binary FTP 133.3 KB Binary http://nsidc.org/data/seaice/images/yesterday_nhem.png Most recent sea ice concentration data for the Northern Hemisphere. Sea ice concentration refers to the fraction of ice within each image pixel. This image is color-coded to show varying levels of ice concentration for the Northern Hemisphere. Grey represents land. Pixels with at least 15 percent concentration are classified as sea ice. Pixels with less than 15 percent ice concentration are classified as water. http://nsidc.org/data/seaice/images/yesterday_shem.png Most recent sea ice concentration data for the Southern Hemisphere. Sea ice concentration refers to the fraction of ice within each image pixel. This image is color-coded to show varying levels of ice concentration for the Southern Hemisphere. Grey represents land. Pixels with at least 15 percent concentration are classified as sea ice. Pixels with less than 15 percent ice concentration are classified as water. 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.

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.

VIEW PROJECT HOME PAGE http://nsidc.org/data/seaice/ Sea Ice Data at NSIDC VIEW RELATED INFORMATION http://nsidc.org/data/nise1.html Near-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent VIEW RELATED INFORMATION http://nsidc.org/data/nsidc-0051.html Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data VIEW RELATED INFORMATION http://nsidc.org/data/g02135.html Sea Ice Index USA/NASA CEOS IDN DIF 9.7 1999-01-01 2012-10-02 Updated spatial coverage