eai {ClimInd}

Emberger aridity index

Description

Aridity index based on annual precipitation and temperature range

Usage

eai(pr, taverage, data_names = NULL, na.rm = FALSE, ...)

Arguments

pr

daily precipitation, mm

taverage

daily mean temperature, Celsius

data_names

names of each period of time

na.rm

logical. Should missing values (including NaN) be removed?

...

further arguments passed to or from other methods

Value

index value

Formula

EAI = \frac {100*P}{Thm^2 - Tcm^2}

P = annual precipitation; Thm = Average temperature of the hottest month in Kelvin; Tcm= Average temperature of the coldest month in Kelvin

References

Emberger L. 1930. La végétation de la région méditerranéenne: essai d'une classification des groupements végétaux Revue Générale de Botanique, 42 (641–662), pp. 705-721

Examples

data(data_all)
eai(pr = data_all$rr, taverage = data_all$tg)