Study on the Impact of Future Climate Change on Extreme Meteorological and Hydrological Elements in the Upper Reaches of the Minjiang River

Table 4

Definitions of indices.

	Index	Index title	Index definition	Unit
Extreme temperature indices	TX10p	Cold days	Annual total days when maximum daily temperature is less than the 10th percentile value in 1961–2016	Days
	TN10p	Cold nights	Annual total days when minimum daily temperature is less than the 10th percentile value in 1961–2016	Days
	TX90p	Warm days	Annual total days when maximum daily temperature is more than the 10th percentile value in 1961–2016	Days
	TN90p	Warm nights	Annual total days when minimum daily temperature is more than the 10th percentile value in 1961–2016	Days
	TXn	Minimum Tmax	The minimum of daily maximum temperature in each month	°C
	TNn	Minimum Tmin	The minimum of daily minimum temperature in each month	°C
	TXx	Maximum Tmax	The minimum of daily maximum temperature in each month	°C
	TNx	Maximum Tmin	The maximum of daily minimum temperature in each month	°C
Extreme precipitation indices	CWD	Consecutive wet days	Maximum number of consecutive days with RR ≥ 1 mm	Days
	R10 mm	Number of heavy precipitation days	Annual count of days when RR ≥ 10 mm	days
	R25 mm	Number of very heavy precipitation days	Annual count of days when RR ≥ 25 mm	Days
	RX1DAY	Maximum 1-day precipitation	Annual maximum 1-day precipitation	mm
	RX5DAY	Maximum 5-day precipitation	Annual maximum 5-day precipitation	mm
Extreme flow indices	AM	Maximum 1-day flow	Annual maximum 1-day flow	m³/s
	IM	Minimum monthly flow	Annual minimum monthly flow	m³/s
	Q90	90% quantile runoff	10% of the daily average runoff series in the year exceed this value	m³/s
	Q95	95% quantile runoff	5% of the daily average runoff series in the year exceed this value	m³/s
	Q99	99% quantile runoff	1% of the daily average runoff series in the year exceeds this value	m³/s
	Q10	10% quantile runoff	More than 90% of the annual average daily runoff of the series	m³/s
	Q5	5% quantile runoff	95% of the daily average runoff series in the year exceed this value	m³/s
	Q1	1% quantile runoff	99% of the daily average runoff series in the year exceed this value	m³/s