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Sea Ice Index

July 1, 2013: The Sea Ice Index team has replaced the
22-year base period with a new 30-year version. Read more.

Blue Marble View

The monthly Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. It is a source for consistently processed ice extent and concentration images and data values since 1979. Monthly images show sea ice extent with an outline of the 30-year (1981-2010) median extent for that month (magenta line). Other monthly images show sea ice concentration and anomalies and trends in concentration.

Monthly Sea Ice Extent Anomaly Graph

The daily Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. It provides consistently processed daily ice extent and concentration images and data since 1979. 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 a 30-year (1981-2010) median (orange line).

Daily Sea Ice Extent Time Series

Blue Marble View

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 since 1979. Monthly images show sea ice extent with an outline of the 30-year (1981-2010) median extent for that month (magenta line). Other monthly images show sea ice concentration and anomalies and trends in concentration.

Monthly Sea Ice Extent Anomaly Graph

The daily Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice. It provides consistent daily ice extent and concentration images and data since 1979. 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 a 30-year (1981-2010) median (orange line).

Daily Sea Ice Extent Time Series Graph