A coefficient devised by Charles Thornthwaite to express the degree of aridity of a climate. A term corresponding to the wetness coefficient. Considering three factors, potential evapotranspiration (the combined amount of evaporation from the earth's surface and transpira- tion from plants), a certain amount of water stored in the soil, and precipitation, if the annual total of the water deficit is d and the annual total of potential evapotranspiration is n , the dryness coefficient Id is Id = 100 d / n . Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
チャールズ・ソーンスウェートによって考案された気候の乾燥の程度を表す係数。湿潤係数に対応する用語。蒸発散位(地表からの蒸発と植物からの発散を合わせた量),一定量の土壌中の貯水量,降水量の三つを考え,水分の不足量の年間合計を d,蒸発散位の年合計を n とすれば,乾燥係数 Id は,Id=100d/n となる。
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