Sea Ice Freeboard Monitoring
Sea ice freeboard of each 20 Hz measurement (Baseline-F onwards): the height of the snow-ice interface above the local sea surface, computed as the radar freeboard plus the snow depth correction (for the slower propagation of the radar pulse through the snow layer). Only computed in SAR and SARin modes. Baseline-F products contain 0 rather than the fill value in LRM mode and where the freeboard error flag is set, so these measurements are excluded. The 10 km grid maps show a statistic (ie the median) of the measurements in each cell of a 10 km polar stereographic grid.
Measurements with the freeboard_error bit (mask 65536) of flag_prod_status_20_ku set are excluded. Only SAR and SARin mode measurements are used.
Baseline-F, cycle 194: 25-Aug-2026 to 23-Sep-2026 · 263 GDR-A files · data covers 18.1 of 30 days Partial cycle processed 11-Oct-2026 01:13 UTC
Sea Ice Freeboard, All modes: Maps
Sea Ice Freeboard, All modes: Cycle 194 Statistics
| Area | Records | Valid | Mean (m) | Median (m) | Std Dev (m) | RMS (m) | Min (m) | Max (m) |
|---|---|---|---|---|---|---|---|---|
| Global | 32,941,951 | 93,908 (0.3%) | 0.17 | 0.16 | 0.19 | 0.25 | -0.30 | 3.03 |
| North Polar (>60N) | 5,641,750 | 0 (0.0%) | – | – | – | – | – | – |
| South Polar (<60S) | 5,553,821 | 91,390 (1.6%) | 0.17 | 0.16 | 0.19 | 0.25 | -0.30 | 3.03 |
Statistics use every 20 Hz measurement of the cycle within each area. Std Dev is the population standard deviation, RMS the root mean square.
Sea Ice Freeboard, All modes: Trends
Click a point to show that cycle.
