Perennial snowfield - Perennial snowfield

Japanese: 越年性雪渓 - えつねんせいせっけい

…Many large snowfields, such as the Hakuba Oyukidake and Tsurugisawa Snowfield, are of this type. Snowfields that do not melt completely in the summer and remain snow-free throughout the year are called perennial (perennial) snowfields (permanent snow), and in the Japanese Alps, snowfields that remain snow-free for 10 to 20 years are known. In perennial snowfields, the snow layer melts and freezes repeatedly, turning into ice and becoming hard snow (firn) with a density of 0.5 g/cm3 or more. …

From "Eternal Snow"

…refers to the perennial expanse of ice and snow that remains during the summer snowmelt season. In mountainous areas, it forms snow valleys and snow fields, so it is now often called a perennial (or perennial) snow valley. It is not appropriate to call it "perennial" snow, since it actually forms in one year.

*Some of the terminology that refers to "winter snowfields" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…白馬大雪渓，劔沢雪渓など，大きな雪渓にはこの型のものが多い。夏にも溶けきらずに越年する雪渓を越年性(多年性)雪渓(万年雪)といい，日本アルプスでは10～20年間も越年する雪渓が知られている。越年性雪渓では，積雪層が融解と凍結を繰り返すうちに氷化して密度0.5g/cm3以上の固い雪(フィルンfirn)となる。…