Daily Data (Arctic)

This site is intended to better study short term events like melt ponds, storms or quick refreezing.

NSIDC Area is calculated as the sum of all pixels with sea ice concentration between 15% and 100%. Pixel area is considered in the calculation. Lake ice is ignored to reduce noise from coastlines.  The current year is calculated from Near Real-Time Data and previous years from Final Data.

More details about Sea ice Area can be found under: Documentation

lowest minimum = 2.241 (2012)
2nd lowest minimum = 2.401 (2016)

lowest maximum = 12.668 (2016)
2nd lowest maximum = 13.080 (2007) 

Note: The anomaly is calculated against the 2007-2016 average.

Full year graph 
A lower compaction ratio during the melting season indicates a higher melt rate. During the freezing season a  low compaction ratio indicates lots of new thin ice.

A more detailed description with images is available under Documentation

Cavalieri, D., C. Parkinson, P. Gloersen, and H. J. Zwally. 1996, updated yearly. Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1. [indicate subset used]. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center.http://dx.doi.org/10.5067/8GQ8LZQVL0VL.