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Glaciers, Snow & Ice Data

NSIDC Sea Ice Extent & Concentration

NSIDC Sea Ice data provides daily Arctic and Antarctic sea ice concentration at 25km from 1979-present — the standard reference for sea ice monitoring.

Format GeoTIFF / Shapefile / PNG
Coverage Arctic and Antarctic
Resolution 25km grid
License Free open access (NSIDC/NASA)
Update Daily, weekly, monthly
Download source Open official source

Format

GeoTIFF / Shapefile / PNG

Geometry

Raster (sea ice concentration)

Coverage

Arctic and Antarctic

Resolution

25km grid

About this dataset

Satellite-derived daily and monthly sea ice extent and concentration for the Arctic and Antarctic from 1979-present.

NSIDC Sea Ice data provides satellite-derived sea ice concentration and extent for both the Arctic and Antarctic from 1979 to present. Using passive microwave sensors (SMMR, SSM/I, SSMIS), the dataset offers daily, weekly, and monthly gridded sea ice concentration at 25km resolution with consistent methodology across the entire record.

Sea ice monitoring Climate change research Polar navigation Arctic ecosystem studies

How to download

  1. 1 Open the NSIDC Sea Ice data page.
  2. 2 Select the product (daily, monthly, or Sea Ice Index).
  3. 3 Choose Arctic or Antarctic region.
  4. 4 Download GeoTIFF or shapefile for sea ice analysis.

NSIDC Sea Ice data

Daily sea ice concentration (passive microwave)

→

Sea Ice Index

Sea Ice Index products and visualization

→

FAQ

How far back does sea ice data go?

The passive microwave sea ice record starts in October 1978, providing over 45 years of consistent daily sea ice observations.

What is sea ice concentration vs extent?

Concentration is the percentage of a grid cell covered by ice (0-100%). Extent is the total area where concentration is ≥15%, used for measuring the ice cap's footprint.