{
  "retrievedAt": "2026-09-17T16:46:25.836075+00:00",
  "observationDate": "2026-09-16",
  "citation": "Fetterer, F., Knowles, K., Meier, W. N., Savoie, M., Windnagel, A. K. & Stafford, T. (2025). Sea Ice Index. G02135, Version 4. NSIDC. https://doi.org/10.7265/a98x-0f50",
  "method": "September monthly extent shapes, 1979\u20132025, threshold 15% mean concentration; monthly extent statistics from NSIDC CSV. The monthly value is not the daily annual minimum. Daily extent raster for 2026-09-16 includes only ice code 1. Latest daily shape compares with the day-of-year median; historical years compare with the September median. Baseline statistic is the arithmetic mean of 1981\u20132010 September extents, not the area enclosed by the spatial median. Shapes simplified by 7 km in source CRS; land and bathymetry by 4.5 km; SVG coordinates rounded to 0.1 units. Natural Earth contextual land and bathymetry. Routes and settlement points are editorial geographic references, not navigation data. No ice thickness or route accessibility is inferred.",
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