Precipitable water - Kakosuiryo

Japanese: 可降水量 - かこうすいりょう
Precipitable water - Kakosuiryo

This is the amount of precipitation assuming that all the moisture in the air falls as rain or snow. The amount of water vapor in the atmosphere varies considerably depending on the location and season, but on average on Earth, an air column with a cross-sectional area of ​​1 square centimeter contains about 3 grams of water vapor. This is equivalent to 30 millimeters of precipitation. The reason that the actual amount of precipitation is much greater than the amount of precipitable water is that moisture constantly evaporates from the Earth's surface, and moist air forms large-scale currents that carry water vapor one after another.

[Takeji Shinohara]

[Reference] | Precipitation

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

空気中に含まれている水分が、すべて雨や雪になって降ったと仮定したときの降水量。場所あるいは季節により大気中の水蒸気量はかなり異なるが、地球上の平均でみれば、断面積1平方センチメートルの空気柱は約3グラムの水蒸気を含む。これは30ミリメートルの降水量にあたる。実際の降水量が可降水量よりもずっと多いのは、地球表面から絶えず水分が蒸発し、湿った空気が大規模な流れになって、次々と水蒸気を運んでくるためである。

[篠原武次]

[参照項目] | 降水量

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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