Sea Ice Index: Arctic and Antarctic Extent and Concentration

From November 1978 to the present, this dataset provides consistent, up-to-date images and data values for sea ice extent and concentration across the Arctic and Antarctic. It includes both monthly and daily products, with trends and anomalies calculated using a 30-year reference period from 1981 to 2010. The consistent production method makes the time-series appropriate for analyzing long-term trends in sea ice cover.

Use Cases

• Analyzing long-term trends in polar sea ice cover based on the consistent monthly time-series.
• Calculating anomalies in ice extent relative to the 1981-2010 climatological baseline.
• Comparing daily versus monthly sea ice variability to separate weather-driven changes from climatic trends.
• Visualizing spatial changes in sea ice concentration using the provided GeoTIFF and PNG image files.

Strengths

• Provides a continuous, consistent record from November 1978 to present, enabling long-term trend analysis.
• Includes data for both polar regions (Arctic and Antarctic) with calculated trends and anomalies.
• Offers data in multiple formats (GeoTIFF, ASCII, PNG) suitable for different analytical and visualization needs.

Limitations

• Metadata for row count, file size, and specific column names is unavailable across all sources.
• The dataset has been moved to a 'Basic' Level of Service due to funding limitations, which may affect support.
• The daily product contains errors that are averaged out in the monthly product, making the latter more reliable for trend analysis.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing, processed into a consistent index.

Time Range

November 1978 to present

Freshness

2026-04-09 22:35:51.695993

Geography

Arctic and Antarctic regions