eai: Emberger aridity index

In ClimInd: Climate Indices

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)

Example output

Loading required package: SPEI
Loading required package: lmomco
Loading required package: parallel
Loading required package: ggplot2
# Package SPEI (1.7) loaded [try SPEINews()].
Loading required package: chron
Loading required package: weathermetrics
    2050     2051     2052     2053     2054     2055     2056     2057 
      NA       NA       NA       NA       NA       NA       NA       NA 
    2058     2059     2060     2061     2062     2063     2064     2065 
      NA       NA       NA       NA       NA       NA       NA       NA 
    2066     2067     2068     1969     1970     1971     1972     1973 
      NA       NA       NA       NA       NA       NA       NA       NA 
    1974     1975     1976     1977     1978     1979     1980     1981 
      NA       NA       NA       NA       NA       NA 4.239807 4.372457 
    1982     1983     1984     1985     1986     1987     1988     1989 
5.077376 4.062116 4.618621 3.715865 5.268143 4.801290 5.429018 6.131370 
    1990     1991     1992     1993     1994     1995     1996     1997 
3.780013 4.282838 4.315963 4.002724 2.607240 4.215876 6.003205 5.614785 
    1998     1999     2000     2001     2002     2003     2004     2005 
4.271459 4.148903 3.364602 2.956778 5.979783 4.614941 4.440370 3.064014 
    2006     2007     2008     2009     2010     2011     2012     2013 
3.151914 4.469213 5.600395 3.535671 4.753869 3.810182 3.012661 4.959726 
    2014     2015     2016     2017 
4.336573 3.628024 4.811840 3.040897 

ClimInd documentation built on April 10, 2021, 1:06 a.m.