Increase of Extreme Drought over Ethiopia under Climate Warming

Table 1

List of the ETCCDI extremes investigated in this study.

Elements	Index name	Definition	Units
Temperature	TMAXmean	Annual maximum temperature mean	°C
	TMINmean	Annual minimum temperature mean	°C
	SU25	Annual count when TX (daily maximum) > 25°C	days
	TR20	Annual count when TN (daily minimum) > 20°C	days
	TXx	Monthly maximum value of daily maximum temp.	°C
	TNx	Monthly maximum value of daily minimum temp.	°C
	TXn	Monthly minimum value of daily maximum temp.	°C
	TNn	Monthly value of daily minimum temp. when TX > 90th percentile	°C
	DTR	Monthly mean difference between TX and TN	°C
	WSDI	Annual count of days with at least 6 consecutive days when TN > 90th percentile	days
Precipitation	RX1day	Monthly maximum 1-day precipitation	mm
	RX5day	Monthly maximum consecutive 5-day precipitation	mm
	SDII	Annual total precipitation divided by the number of wet days (defined as PRCP ≥ 1.0 mm) in the year	mm/day
	R10	Annual count of days when PRCP ≥ 10 mm	days
	R20	Annual count of days when PRCP ≥ 20 mm	days
	R25	Annual count of days when PRCP ≥ 25 mm	days
	CDD	Maximum number of consecutive days with RR < 1 mm	days
	CWD	Maximum number of consecutive days with RR ≥ 1 mm	days
	R95p	Annual total PRCP when PR > 95th percentile	mm
	R99p	Annual total PRCP when PR > 99th percentile	mm
	PRCPTOT	Annual total PRCP in wet days (RR ≥ 1 mm)	mm

Note: full definitions are available at http://etccdi.pacificclimate.org/list_27_indices.shtml.