Antarctic marginal ice zone width data from AltiKa

These data underpin the Fraser et al., 2026 publication in Nature Communications: "Revealing the Antarctic marginal ice zone: a decade-long wave-in-ice climatology". They are presented as one .csv file per year, each containing around 8500-9000 rows. Each row corresponds to the data retrieved from a SARAL half-orbit (pole to pole). Each row presents the along-track summary fields used to estimate the wave-affected marginal ice zone width. The marginal ice zone width is estimated from the difference in latitude between the ice edge and the latitude of the "inner MIZ limit". The inner MIZ limit is estimated from AltiKa Ka-band radar altimeter waveforms: where the waveform of returned power becomes suffiently peaky and "steep", we interpret this as being the point where wave passage becomes undetectable.