{"id":"polar_sea_ice","title_ru":"Морской лёд обоих полушарий: площадь и протяжённость","title_en":"Sea ice in both hemispheres: area and extent","rows":2471,"entities":2,"entity_types":["polar_region"],"measures":["sea_ice_area","sea_ice_area_annual_mean","sea_ice_extent","sea_ice_extent_annual_mean"],"period_start":"1978-11-01","period_end":"2026-09-30","time_basis":["calendar_month","calendar_year"],"source_url":"https://nsidc.org/data/g02135/versions/4","license":"Public government-funded scientific data; required attribution: Fetterer et al. (2025), Sea Ice Index v4, doi:10.7265/a98x-0f50; NSIDC data/citation policies.","metadata":"/data/indicators/life/meta/polar_sea_ice.json","pages":25,"page_size":100,"columns":["entity_type","entity_id","iso3","period_start","period_end","time_basis","measure","value","unit","dimensions","quality","source_url","raw_sha256"],"units":{"sea_ice_area":["million km2"],"sea_ice_area_annual_mean":["million km2"],"sea_ice_extent":["million km2"],"sea_ice_extent_annual_mean":["million km2"]},"parts":[{"id":"polar_sea_ice","rows":2471,"page_offset":0,"pages":25,"csv":"/data/indicators/life/datasets/polar_sea_ice.csv"}],"inputs":[{"url":"https://noaadata.apps.nsidc.org/NOAA/G02135/seaice_analysis/Sea_Ice_Index_Monthly_Data_by_Year_G02135_v4.0.xlsx","resolved_url":"https://noaadata.apps.nsidc.org/NOAA/G02135/seaice_analysis/Sea_Ice_Index_Monthly_Data_by_Year_G02135_v4.0.xlsx","retrieved_at":"2026-10-06T00:15:46.561102+00:00","sha256":"bf05345d0e59777c288379598229535bd32d2ba0eece4bbfd1dc54d32a2be569","bytes":26045,"content_type":"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}],"notes_ru":"Fetterer et al. (2025), Sea Ice Index v4, DOI 10.7265/a98x-0f50. Northern/Southern Hemisphere не страны. Extent считает целые ячейки с концентрацией льда ≥15%; area учитывает концентрацию. Месячные спутниковые оценки, млн км², не объём и не ледники суши. Последние точки могут быть предварительными. Годовое среднее источника взвешено по дням; публикуется только при наличии всех 12 месяцев. Не суммируем полушария как универсальный климатический индекс.","notes_en":"Fetterer et al. (2025), Sea Ice Index v4, DOI 10.7265/a98x-0f50. Northern/Southern Hemisphere are not countries. Extent counts whole grid cells with ice concentration ≥15%; area weights by concentration. Monthly satellite estimates in million km², not volume or land glaciers. Recent points may be preliminary. The published annual mean is calendar-day weighted and retained only with all 12 months present. Hemispheres are not summed into a universal climate index."}