U.S. GEOLOGICAL SURVEY DIGITAL DATA SERIES DDS-27

               Monthly Average Polar Sea-Ice Concentration

                         By Peter N. Schweitzer


                              REFERENCES


    Edwards, M.H. 1989, Global gridded elevation and bathymetry (ETOPO5):
    Digital raster data on a 5-minute geographic (lat/long) 2160x4320
    (centroid-registered) grid: Boulder, Colorado, U.S. National Oceanic
    and Atmospheric Administration, National Geophysical Data Center,
    9-track tape, 18.6 megabytes.

    Gloersen, P., Campbell, W.J., Cavalieri, D.J., Comiso, J.C.,
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    National Snow and Ice Data Center, 1994, Nimbus-7 SMMR polar radiances
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    National Snow and Ice Data Center [1992], DMSP SSM/I [U.S. Air Force
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    (870709-891231): Boulder, Colorado, National Snow and Ice Data Center,
    1 CD-ROM.

    National Snow and Ice Data Center [1993], DMSP SSM/I [U.S. Air Force
    Defense Meteorological Satellite Program, Special Sensor Microwave/
    Imager] ice concentration grids for the polar regions, vol. 2, rev. 2
    (900101-911231): Boulder, Colorado, National Snow and Ice Data Center,
    1 CD-ROM.

    National Snow and Ice Data Center, 1992, DMSP SSM/I brightness
    temperature and sea ice concentration grids for the polar regions on
    CD-ROM, User's guide: National Snow and Ice Data Center Special Report
    1 [300 p.].

    U.S. National Aeronautics and Space Administration [1992], Radiances
    on a north polar stereographic grid 4/1/87 - 8/20/87 and Arctic and
    Antarctic sea ice concentrations 10/25/78 - 8/20/87, v. 7 of Nimbus-7
    Scanning Multichannel Microwave Radiometer (SMMR) Polar Data: Boulder
    Colorado, National Snow and Ice Data Center, 1 CD-ROM.

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