soft rime (English spelling) softrime

Japanese: soft rime（英語表記）softrime

...When the temperature near the ground drops below 0°C, the ice that is formed when water vapor in the atmosphere sublimes directly onto the surface of trees or objects, or when supercooled cloud particles adhere to and freeze is called frost. Depending on how the ice is formed, it can be divided into three types: frost on trees, ice on trees, and rough ice. Ice on trees is formed when supercooled cloud particles collide with cold trees or objects one after another and freeze instantly, resulting in opaque white ice made up of many ice particles, which can be thought of as being formed in the same way as hail. It is generally a fragile ice with a thin fan-shaped base, and is sometimes called a "shrimp's tail" due to its shape. ...

From [Frost]

...On clear winter nights, when the temperature near the ground drops due to radiation cooling, they tend to grow on the windward side of objects and trees. (2) Soft rime This is mainly supercooled cloud particles colliding with cold trees and objects one after another, and is instantly frozen into opaque white, brittle ice with a thin, fan-shaped base. It is sometimes called a "shrimp tail" because of its shape. It can be thought of as being formed in the same way as hail. ...

*Some of the terminology that mentions "soft rime" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…主として地表付近の気温が0℃以下になったとき，樹木や地物の表面に大気中の水蒸気が直接昇華したり，また過冷却雲粒が付着し凍結してできた氷を総称して霧氷というが，氷のでき方によって，樹霜，樹氷，粗氷の3種に分けられる。樹氷は過冷却雲粒が冷たい樹木や地物につぎつぎに衝突し，瞬間的に凍り，たくさんの氷の粒からなる白色不透明の氷で，あられのでき方と同じと考えてよい。一般に根元が細く扇形のもろい氷なので，その形から〈えびのしっぽ〉などとよばれることもある。…

【霧氷】より

…冬の晴れた夜，地面近くが放射冷却によって気温が下がったときに地物や樹木の風上側に成長しやすい。(2)樹氷soft rime　おもに過冷却雲粒が冷たい樹木や地物に次々に衝突し，瞬間的に凍った白色不透明の根元が細く扇形のもろい氷で，その形から〈えびのしっぽ〉と呼ばれることがある。あられのでき方と同じと考えてよい。…

※「soft rime」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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