Lead detection in Arctic sea ice from CryoSat-2 : quality assessment, lead area fraction and with distribution

• Published in: The Cryosphere
• Main Authors: Wernecke, A., Kaleschke, L.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2015
• Subjects: Arctic; Beaufort Sea; Sea ice; The Cryosphere
• Online Access: http://hdl.handle.net/11858/00-001M-0000-0025-B467-9

Leads cover only a small fraction of the Arctic sea ice but they have a dominant effect on the turbulent exchange between the ocean and the atmosphere. A supervised classification of CryoSat-2 measurements is performed by a combination with visual MODIS scenes. For several parameters thresholds are optimized and tested in order to reproduce this prior classification. The maximum power of the waveform shows the best classification properties amongst them, including the Pulse Peakiness. With the same correct lead detection rates as of published classifiers, the amount of ice being detected as lead can be reduced by up to 40%. Lead area fraction estimates based on CryoSat-2 show a major fracturing event in the Beaufort Sea in 2013. The resulting Arctic wide lead width distribution follows a power law with an exponent of 2.47 ± 0.04 for the winter seasons from 2011 to 2014, confirming and complementing a regional study based on a high resolution SPOT image.