National Snow and Ice Data Center

2025 Arctic sea ice minimum squeezes into the ten lowest minimums

The overall, downward trend in the minimum extent from 1979 to 2025 is 12.1 percent per decade relative to the 1981 to 2010 ...
National Snow and Ice Data Center

Arctic sea ice has reached minimum extent for 2025

For further information, please see our "This year is yet another low extent for Arctic sea ice," said senior scientist Walt ...
National Snow and Ice Data Center

Taking a bite out of the Beaufort

Throughout August 2025, sea ice rapidly melted and compacted north of Alaska in the Beaufort Sea, initiated by a warm pulse ...
Arctic Sea Ice

What is the Cryosphere?

The cryosphere influences our world's climate, provides water for ecosystems, supports agriculture and is central to the daily lives of people, plants, and animals. Many animals and plants are ...
Arctic Sea Ice

Global Terrestrial Network for Permafrost (GTN-P), Version 1

Dear data users, NSIDC does not archive or provide citation guidance for these data. The Global Terrestrial Network for Permafrost (GTN-P) was established in 1999 by the International Permafrost ...
Arctic Sea Ice

IPA-IPY Thermal State of Permafrost (TSP) Snapshot Borehole Inventory, Version 1

As a condition of using these data, you must cite the use of this data set. Such a practice gives credit to data set producers and advances principles of transparency and reproducibility. Other ...
Arctic Sea Ice

Seasonal frost depths, midwestern USA, Version 1

As a condition of using these data, you must cite the use of this data set. Such a practice gives credit to data set producers and advances principles of transparency and reproducibility. Other ...
Arctic Sea Ice

Propagation of Uncertainties in Sea Ice Thickness Calculations from Basin-Scale Operational Observations

FOR THE PUBLIC News & Stories Learn About Snow & Ice Current Conditions & Analyses Featured Research Careers For the Media EDUCATORS/STUDENTS Current Conditions & Analyses Explore Data Help Center Our ...
Arctic Sea Ice

HadISST Monthly Sea Ice Concentrations, Version 1

Dear data users, NSIDC does not archive or provide citation guidance for these data. Data from HadISST contains measurements of sea surface temperature (SST) and also global sea ice coverage (HadISST1 ...
Arctic Sea Ice

How to access NSIDC data using an FTP client, command line, wget, or Python

FTP Client: Perfect for users who prefer a visual interface with drag-and-drop functionality Command Line: Excellent for power users and task automation Wget: Efficient for downloading multiple files ...
Arctic Sea Ice

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci) Sea Ice Concentration Climate Data Record from the AMSR-E and AMSR-2 Instruments at 25 km Grid Spacing, Version 1

Dear data users, NSIDC does not archive or provide citation guidance for these data. The data set provides a 25 km grid Climate Data Record of Sea Ice Concentration (SIC) for the polar regions, ...
Arctic Sea Ice

New study explains Antarctica’s coldest temperatures

The National Snow and Ice Data Center (NSIDC) is part of the Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder. Tiny valleys near the top of Antarctica ...