---
cited_by: []
definition: 'Sea ice is described by the area it covers, its thickness, its age, and its movement with the winds and ocean currents. Concentration is a unitless term that describes the relative amount of area covered by ice, compared to some reference area. Thus, concentration describes how much of a 25.0 kilometer by 25.0 kilometer (15.5 mile by 15.5 mile) box is covered by sea ice. Ice concentration typically is reported as a percentage (0 to 100 percent ice), a fraction from 0 to 1, or sometimes in tenths (0/10 to 10/10). Our Sea Ice Index products show ice concentration as a percentage. A value of 0 means there is no ice, while a value of 100 means the region is completely covered by ice.'
href: https://data.globalchange.gov/gcmd_keyword/a3f36d7c-4eed-4d7a-8902-a5fcdc1b6261.yaml
identifier: a3f36d7c-4eed-4d7a-8902-a5fcdc1b6261
label: ICE FRACTION
parent_identifier: 8012fda7-3ea4-4ef2-bb4e-0f66d4d9e850
uri: /gcmd_keyword/a3f36d7c-4eed-4d7a-8902-a5fcdc1b6261