Precipitation effectiveness

Japanese: precipitation effectiveness(英語表記)precipitationeffectiveness
Precipitation effectiveness

...The indices corresponding to vegetation distribution are K = P / ( W + 20) (when W < 100) and K = 2P / ( W + 140) (when W > 100), which are called the dry and wet indices ( P (mm) is the annual precipitation).
[Precipitation effectiveness]
The ratio of monthly precipitation P (inches) divided by monthly evaporation E (inches) ( P - E ratio) is calculated by multiplying the total for 12 months by 10. This is called the precipitation efficiency or P - E index, and was invented by C.W. Thornthwaite for his climate classification (old classification). It refers to the efficiency of precipitation taking into account the water lost through evaporation. …

*Some of the terminology used in reference to "precipitation effectiveness" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…なお植生分布に対応する示数としてKP/(W+20)(W<100の場合),K=2P/(W+140)(W>100の場合)を乾湿示数と名付けている(P(mm)は年降水量)。
[降水効率precipitation effectiveness]
 月降水量P(インチ)を月蒸発量E(インチ)で割った比(PE比)を12ヵ月合計してこれを10倍したものを降水効率またはPE示数といい,C.W.ソーンスウェートが気候分類(旧分類)のために考案したもの。蒸発によって失う水分を考慮した降水の効率を意味する。…

※「precipitation effectiveness」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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