Keywords: NorthernHemisphere-SeaIceExtent-trend-sep.png en Northern Hemisphere Sea Ice Extent in September Data source http //nsidc org/data/docs/noaa/g02135_seaice_index/ NSIDC Sea Ice Index See also http //www arctic noaa gov/detect/ice-seaice shtml NOAA webpage on Arctic Change ja 北半球における9 の海氷 積の経年変化 出典 http //nsidc org/data/docs/noaa/g02135_seaice_index/ NSIDC Sea Ice Index 解説資料 http //www arctic noaa gov/detect/ice-seaice shtml NOAA webpage on Arctic Change NSIDC Sea Ice Index http //nsidc org/data/docs/noaa/g02135_seaice_index/ s-kei 2011-05-16 Cc-zero Climate change Sea ice |