Freeze-up of Arctic Sea Ice in the U.S. Beaufort and Chukchi Seas (2013-2014)

Previous freeze-up studies (2009-10 through 2012-13), had begun to reveal that freeze-up timing could not be predicted from air temperature alone, and that phenomena such as extraordinary ice-fracturing events and coastal flaw lead behavior warranted continued year-over-year documentation to distinguish lasting trends from natural variability. This fifth consecutive study was designed to document the 2013-14 freeze-up season and extend the five-year dataset needed to characterize present-day freeze-up processes relative to the 1980s baseline. Researchers combined proprietary and public satellite imagery (RADARSAT-2, AVHRR, MODIS), meteorological data, ice charts, and telemetry buoy tracks (including new participation in the International Arctic Buoy Programme) with five aerial reconnaissance flights conducted in late March 2014, after contractual delays prevented earlier-season flights. The 2013-14 winter was the warmest of the 44-year temperature record at Barrow, producing the thinnest first-year ice measured in the five-year study series; freeze-up was delayed by roughly ten days in both seas relative to the prior four-year average; and the Chukchi coastal flaw lead repeatedly channeled multi-year ice floes south of Point Barrow, contributing to the ninth multi-year ice invasion recorded in fourteen years. The five-year record now supports more statistically grounded estimates of invasion probability and storm frequency, confirms that air temperature alone is an unreliable predictor of freeze-up timing, and reinforces that sea surface temperature, wind conditions, and salinity must be incorporated into forecasting approaches used for offshore facility design and operational planning in the region. This abstract was drafted with the assistance of Claude, July 2026.