Twenty-First Century Projected Changes in Extreme Temperature over Côte d’Ivoire (West Africa)

Table 2

The ETR and ETCCDI (HWFI, TX90P and TN90P) temperature indices. The terms T_Xn90, T_Nn90, T_Gn90 are the 90^th percentile of the maximum, minimum and mean temperature, and the terms T_Gi, T_Ni, T_Xi, indicate the mean, minimum and maximum temperature, respectively. TN_Ni is the minimum of the minimum temperature and TX_Xi is the maximum of the maximum temperature. All these terms are used to calculate the ETR and ETCCDI (HWFI, TX90P and TN90P) indices that are given in bold.

Index	Definition	Expression	Unit
HWFI	Warm spells duration index	Count when at least six (6) consecutive days with daily maximum temperature is greater than 90^th percentile (TGi > TGn90)	Days
ETR	Intra period extreme temperature range	Difference between the maximum of the maximum temperature and the minimum of the minimum temperature (ETR = TXXi−TNNi)	°C
TX90P	Warm days	Percentage of days when daily maximum temperature is greater than 90^th percentile (TXi > TXn90)	%
TN90P	Warm nights	Percentage of days when daily minimum temperature is greater than 90^th percentile (TNi > TNn90)	%