Temporal-Spatial Characteristics and Future Changes of Temperature Extremes in Longtan Watershed Based on Multiple Indices

Table 1

Definition of extreme temperature index.

	Index	Name	Definition	Unit
Intensity index
1	TXx	Extreme Tmax	The maximum value of daily Tmax in a year	°C
2	TNn	Extreme Tmin	The minimum value of daily Tmin in a year	°C
3	DTR	Diurnal temperature range	Average difference between annual daily Tmax and Tmin	°C
Frequency index
4	SU25	Summer days	Total number of days with daily Tmax >25°C	d
5	FD	Frost days	Total number of days with daily Tmin <0°C	d
6	TX90p	Warm days	Annual count of daily Tmax >90% percentile value	d
7	TN90p	Warm nights	Annual count of daily Tmin >90% percentile value	d
8	TX10p	Cold days	Annual count of daily Tmax <10% percentile value	d
9	TN10p	Cold nights	Annual count of daily Tmin <10% percentile value	d
Duration index
10	WSDI	Warm spell duration indicator	Annual count of at least six consecutive days of Tmax >90% percentile value	d
11	CSDI	Cold spell duration indicator	Annual count of at least six consecutive days of Tmin <10% percentile value	d