Trend and Abrupt Regime Shift of Temperature Extreme in Northeast China, 1957–2015

Table 1

Description of the temperature indices used in this paper; all the indices are computed using RClimDEX.

Index	Index description	Definitions	Units
Extremely cold temperature indices
TN10p	Cold night frequency	Percentage of time when daily minimum temperature <10th percentile	^%
TNn	Min Tmin (coldest night)	The minimum value of the daily minimum temperature	°C
TXn	Min Tmax (coldest day)	The minimum value of the daily maximum temperature	°C
DTR	Diurnal temperature range	Mean difference between daily maximum temperature and daily minimum temperature	°C
FD	Frost days	Count of days where daily minimum temperature <0°C	Days
ID	Icing days	Count of days where daily maximum temperature <0°C	Days
Extremely warm temperature indices
TN90p	Warm night frequency	Percentage of time when daily minimum temperature >90th percentile	^%
TNx	Max Tmin (warmest night)	Maximum value of daily minimum temperature	°C
TXx	Max Tmax (warmest day)	Maximum value of daily maximum temperature	°C
Tr	Tropical nights	Count of days where daily minimum temperature >20°C	Days
GSL	Growing season length	Period between when daily mean temperature, >5°C for >5 days and daily mean temperature, < 5°C for >5 days	Days