aridity index

Japanese: aridity index(英語表記)aridityindex
aridity index

...The Martonne drying index is an improvement on this.
[Drying index]
Martonne's aridity index I is expressed as I = P / ( T + 10), where P is the annual precipitation and T is the sum of the monthly mean temperatures for months above 0°C divided by 12. It corresponds well to natural landscapes and land use, with I below 5 being desert, I between 5 and 10 being steppe, and I above 10 being possible for dry agriculture, but artificial irrigation is necessary up to I = 20.

*Some of the terminology explanations that mention "aridity index" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…マルトンヌの乾燥示数はこれを改良したものである。
[乾燥示数aridity index]
 マルトンヌの乾燥示数Iは,年降水量をP,月平均気温を0℃以上の月について合計しそれを12で割った値をTとしたとき,IP/(T+10)で表したものである。自然景観や土地利用とよく対応し,I=5以下が砂漠,I=5~10がステップ,I=10以上では乾燥農業が可能であるが,I=20までは人工灌漑が必要である。…

※「aridity index」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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