Data from this array of drifting buoys provide time series of snow accumulation and ablation, ice growth, ice surface and bottom melt, internal ice temperature fields, and temporally-averaged estimates of ocean heat flux, along with position, sea level pressure, and surface air temperature. These data enable the attribution of thermodynamic ice loss to surface or bottom forcing. Near-real time data from active buoys, including changes in the snow depth and ice thickness, are automatically updated at 0h00 and 12h00 UTC daily.