出典:Wiktionary
出典:『Wiktionary』 (2024/12/12 22:52 UTC 版)
Borrowed from German Firn, from Alemannic German firn (“last year's”), from Old High German firni (“old”), from Proto-West Germanic [Term?], from Proto-Germanic *firnijaz, *fernaz (“foregoing, previous”), from Proto-Indo-European *per- (“forth, forward, across, through”); cognate with 古期英語 fyrn (“former”), Old Norse forn (“old”), and Gothic 𐍆𐌰𐌹𐍂𐌽𐌴𐌹𐍃 (fairneis, “old”).
firn (countable and uncountable, plural firns)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/27 12:34 UTC 版)
Firn (from German Firn with the same meaning, cognate with for) is partially-compacted névé, a type of snow that has been left over from past seasons and has been recrystallized into a substance denser than névé. It is ice that is at an intermediate stage between snow and glacial ice. Firn has the appearance of wet sugar, but has a hardness that makes it extremely resistant to shovelling. Its density generally ranges from 550 kg/m³-830 kg/m³ and can be often found underneath the snow that accumulates at the head of a glacier.