mai: De Martonne aridity index

In ClimInd: Climate Indices

Description

De Martonne aridity index is the ratio between the annual amount of precipitation and anual mean of temperature plus 10 Celsius.

Usage

mai(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

MAI = \frac{P} {TG+10}

P = annual precipitation (mm); TG = mean annual air temperature (Celsius)

References

De Martonne E., 1926. Une nouvelle fonction climatologique: L’indice d’aridité. La Meteorologie, 449-458.

Examples

data(data_all)
mai(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 24.41496 22.20308 
    1982     1983     1984     1985     1986     1987     1988     1989 
25.77840 21.38974 25.79232 21.30028 26.01198 25.52069 26.15076 29.92953 
    1990     1991     1992     1993     1994     1995     1996     1997 
19.71477 24.14550 23.73315 20.49254 14.18020 19.86997 29.47697 25.57808 
    1998     1999     2000     2001     2002     2003     2004     2005 
20.90682 20.92114 17.24457 16.18496 25.58041 25.38202 21.46937 17.39997 
    2006     2007     2008     2009     2010     2011     2012     2013 
17.36177 21.48162 29.10595 19.28905 27.19403 19.43908 17.77395 26.33624 
    2014     2015     2016     2017 
21.33112 20.96459 22.81382 15.70575 

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