Data of Sea Ice Extent

AMSR-E Sea Ice Extent
Numeric data of sea ice extent in the Arctic Ocean (CSV file)
  • Data from June 2002 to the present are included.
  • The format is "month, day, year, extent (unit: square km)".
  • Number "-9999" represents that we couldn't conduct the observation during the period for the reason that the satellite went into constrained operation mode or stand-by mode to avoid harmful effects by meteor showers and solar flares.
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The method for area calculation
  • Sea ice concentration (SIC) data* of AMSR-E standard products are used for area calculation.
  • Usually, sea ice extent is defined as an average of several days in order to eliminate calculation errors by data deficiency. However, we adopt the average of two days in this site for the purpose of rapid release.
    *Thanks to the cooperative relationship between NASA and JAXA, we are applying the AMSR-E sea ice concentration algorism developed by Dr. Comiso in NASA/GSFC.
Notes on the data
  • The numbers of sea ice extent in this site are estimates calculated by certain algorism.
  • When you use our data and graph, please follow our site policy.

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