jci {ClimInd}

Johansson Continentality Index

Description

The Johansson Continentality Index is usually used for the climatic differentiation between continental and oceanic climates.

Usage

jci(data, data_names = NULL, value, na.rm = FALSE, ...)

Arguments

data

daily mean temperature, Celsius

data_names

names of each period of time

value

lat

na.rm

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

...

further arguments passed to or from other methods

Value

index value

Formula

JCI = \frac {1.7(Thm-Tcm)}{sinf}-20.4

Thm = Average temperature of the hottest month (Celsius); Tcm = Average temperature of the coldest month (Celsius); f = geographical latitude

References

Chronopoulou-Sereli A. 1996. Courses of Agricultural Meteorology.Publications Agricultural University of Athens: Athens, OH

Examples

data(data_all)
jci(data = data_all$tg, value = data_all$lat)