60 yrs1959 to 201950 yrs1969 to 201940 yrs1979 to 201930 yrs1989 to 201920 yrs1999 to 2019Air TemperatureFrozen Ground
This variable represents surface air temperature at 1/24° (~4 km) spatial resolution, derived from the TerraClimate data set (Abatzglou et al., 2018)."
decreaseincrease
Arctic Boreal Zone
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°C per decade
Analysis Location
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°C per decade
This variable represents the number of days the ground surface was frozen according to the Freeze-thaw Earth System Data Record (FT-ESDR), which is based on satellite microwave remote sensing of brightness temperatures (Kim et al., 2017).