Abnormal visibility - Ijōshī

Japanese: 異常視程 - いじょうしてい
Abnormal visibility - Ijōshī

... Visibility improves after rain washes away fine particles from the atmosphere, or when strong cold air blows in from the continent, causing active convection in the atmosphere and dispersing the fine particles. Visibility of more than 50 km is called abnormal visibility. When the temperature is higher in the upper atmosphere and a temperature inversion layer is formed, the atmosphere becomes stable and the fine particles accumulate, resulting in poor visibility. ...

*Some of the terminology that refers to "abnormal visibility" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 大気中の微粒子が雨で洗い落とされたあとや,大陸から強い寒気が吹きこみ,大気中の対流が活発になって微粒子が拡散するとき,視程はよくなる。50km以上の視程を異常視程という。気温が上空ほど高く,気温の逆転層ができると,大気は安定化し微粒子がたまってしまうので,視程は悪くなる。…

※「異常視程」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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