De Martonne aridity index
De Martonne aridity index is the ratio between the annual amount of precipitation and anual mean of temperature plus 10 Celsius.
mai(pr, taverage, data_names = NULL, na.rm = FALSE, ...)
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 |
index value
MAI = \frac{P} {TG+10}
P = annual precipitation (mm); TG = mean annual air temperature (Celsius)
De Martonne E., 1926. Une nouvelle fonction climatologique: L’indice d’aridité. La Meteorologie, 449-458.
data(data_all) mai(pr = data_all$rr, taverage = data_all$tg)
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