Ice concentration and ice thickness time series. a) Ice concentration from AMSR2 (lines), TerraSAR-X (circles), and RADARSAT-2 (Xs). RADARSAT-2 concentrations are only shown for July – September for simplicity. b) Ice thickness plotted as ice elevation and ice draft at C2–C5 with the central location in bold and outlying IMB data in lighter dashed lines. At C5, the lighter blue central location is the average melt/growth of the outlying IMB data combined with the initial thickness of the ITP-V hole. Gray bars as in Figure 3. Vertical magenta and dashed gray lines denote 15 May, 27 June, and 1 September. DOI: https://doi.org/10.1525/elementa.241.f4