second-year ice

second-year ice

[′sek·ənd ¦yir ′īs]
(oceanography)
Sea ice that has survived only one summer's melt. Also known as two-year ice.
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A larger volume of younger ice meant that a larger portion of it made it through the summer and was available to form second-year ice.
The salt content in first- and second-year ice gives them different electrical properties than multi-year ice: In winter, when the surface of the sea ice is cold and dry, the microwave emissivity of multiyear ice is distinctly different from that of first- and second-year ice.
But, most of the 2009 September Arctic sea ice is thin first- or second-year ice, rather than thicker, multi-year ice that used to dominate the region," said Meier.