| Term: | First-year ice |
| Definition: | Sea ice of not more than one winter's growth, developing from young ice; thickness 30 cm - 2 m, and sometimes slightly more. May be subdivided into thin first-year ice/white ice, medium first-year ice and thick first-year ice. |
| Term: | First-year ice |
| Definition: | Sea ice terminology, meaning sea ice that has grown for not more than one winter, developing from young ice. It must also be 30 cm or greater. First-year ice may be subdivided into thin first-year ice (sometimes referred to as white ice), medium first-year ice, and thick first-year ice. |
| Term: | First-year ice |
| Definition: | Sea ice that has not yet experienced summer melt. First-year ice is distinguished from older ice primarily by having a higher salinity. Undeformed first-year ice differs from older ice in that it is smoother and lacks refrozen melt ponds. First-year ridges are distinguished by being larger, more angular, and more porous than multiyear ridges. |
| Term: | First-year ice |
| Definition: | Floating ice of no more than one year's growth developing from young ice; thickness from 0.3 to 2 meters (1 to 6.6 feet); characteristically level where undisturbed by pressure, but where ridges occur, they are rough and sharply angular. |
| Term: | First-year ice |
| Definition: | Sea ice of not more than one winter's growth, developing from young ice; thickness (typically) 30cm2m. May be subdivided into thin first-year ice/white ice, medium first-year ice and thick first-year ice. |
| Term: | First-year ice |
| Definition: | Sea ice of not more that one winter's growth, developing from young ice; thickness 1 to 7 ft (30 cm-2 in). May be subdivided into thin first-year ice (white ice), medium first-year ice, and thick first-year ice. |
| Term: | First-year ice |
| Definition: | Floating ice of not more than one year's growth developing from young ice. Thickness from 30 cm to 2 m. Characteristically level where undisturbed by pressure, but where ridges occur they are rough and sharply angular. |