多た年ねん氷ひょうじ字FuriganaMeanings1nounmulti-year iceTechnical term in glaciology and oceanography for sea ice that has survived at least two summer melt seasons.北ほっ極きょく海かいでは多た年ねん氷ひょうが減げん少しょうしている。Multi-year ice is decreasing in the Arctic Ocean.
