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Here you can access the Sea Ice Index archives of images and data in various formats.
Animate a series of images of extent, concentrations, anomalies, trends, or plots over a specified period of time.
Data files tabulate extent and area (in millions of square kilometers) by year for a given month. For example, the file "N_04_area.txt" contains data from the Northern Hemisphere for the month of April.
Image files are available. For example, the file "S_200303_anom.png" is an image of concentration anomalies in the Southern Hemisphere in March 2003.
Monthly sea ice extent shapefiles, November 1978 to present. Shapefiles are available for Northern and Southern hemispheres, both polygons and polylines.
Monthly median shapefiles. Each month's shapefile indicates that month's median extent for the period 1979 to 2000. Shapefiles are available for Northern and Southern hemispheres, polylines only.
Shapefiles are organized in monthly directories, by extent for that month and year or by median extent for that month. Files are zipped. For example, "extent_N_199806_polyline.zip" contains the polyline extent shapefile for the Northern Hemisphere for June 1998.
The Sea Ice Index is derived from Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data and Near-Real-Time SSM/I Polar Gridded Sea Ice Concentrations (NRTSI).
These satellite-derived images depict current sea ice conditions and trends. Long-term changes in Arctic sea ice are an index of climate change. Southern Hemisphere sea ice images are also available. For more information about current conditions and their significance, see Arctic Sea Ice News and Analysis.
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