The monthly Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice. It is a source for consistent ice extent and concentration images and data values from 1979 to the present. Monthly images show sea ice extent with an outline of the median extent for that month (magenta line). Other monthly images show sea ice concentration and anomalies and trends in concentration.

The daily Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice. It is a source for consistent daily ice extent and concentration images and data from 1979 to the present. Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on 1979 through 2000 data (orange line).