Data obtained with the SIRAL instrument aboard the CryoSat-2 satellite are used to produce a data set of the percentage lead area fraction for winter months January, February, and March on the NSIDC polar-stereographic grid with 100 km grid resolution.
The first step is a supervised classification of different parameters derived from SIRAL measurements. The results of the classification are inter-compared with contemporary MODIS visible imagery with the goal to find the best parameter / parameter combination to identify leads in Arctic sea ice. The parameter with the best classification agreement to the MODIS imagery which - among the pulse peakiness - is the maximum power of the waveforms is used to derive the Arctic lead area fraction offered here.
For more details of the methodology and potential limitations we refer to the publications given in the references.
This data set has been published via ICDC on October 9 2015.