{"sample":true,"collected_at":"2026-10-02T11:30:00Z","current_source_check":false,"dataset":"sea_ice_extent","range":{"start":"2025-03-01","end":"2025-03-07","expected_days":7,"returned_days":7},"units":"million km2","first":13.835,"last":14.012,"change":0.177,"mean":13.969,"observations":[{"date":"2025-03-01","value":13.835},{"date":"2025-03-02","value":13.969},{"date":"2025-03-03","value":13.866},{"date":"2025-03-04","value":13.981},{"date":"2025-03-05","value":14.071},{"date":"2025-03-06","value":14.046},{"date":"2025-03-07","value":14.012}],"provenance":[{"requested_end":"2025-03-07","as_of":"2026-10-01","fetched_at":"2026-10-02T11:29:34Z","expires_at":"2026-10-02T23:29:34Z","cache":"hit","source_url":"https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv","attribution":"NSIDC Sea Ice Index, Version 4 (G02135), National Snow and Ice Data Center, Boulder, Colorado"},{"requested_end":"2025-03-04","as_of":"2026-10-01","fetched_at":"2026-10-02T11:29:34Z","expires_at":"2026-10-02T23:29:34Z","cache":"hit","source_url":"https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv","attribution":"NSIDC Sea Ice Index, Version 4 (G02135), National Snow and Ice Data Center, Boulder, Colorado"},{"requested_end":"2025-03-01","as_of":"2026-10-01","fetched_at":"2026-10-02T11:29:34Z","expires_at":"2026-10-02T23:29:34Z","cache":"hit","source_url":"https://noaadata.apps.nsidc.org/NOAA/G02135/north/daily/data/N_seaice_extent_daily_v4.0.csv","attribution":"NSIDC Sea Ice Index, Version 4 (G02135), National Snow and Ice Data Center, Boulder, Colorado"}],"note":"Historical Arctic extent observations. Not a forecast. as_of describes the source, not the requested range."}