Table 1.

Symbols, abbreviations and units of measurement used in text and model mathematics

Abbreviation	Definition	Unit
B	Bias or mean error	°C
clog,a	Logistic component during acclimation	Dimensionless
clog,d	Logistic component during deacclimation	Dimensionless
DDc	Chilling degree-days	°C
DDh	Heating degree-days	°C
DTA	Differential thermal analysis
EDB	Eco-dormancy boundary, DDc accumulation required to start eco-dormancy	°C
Hc	Cold hardiness	°C
Hc,i	Cold hardiness for day i	°C
Hc,i–1	Cold hardiness for day i–1	°C
Hc,initial	Initial cold hardiness, genotype-specific constant	°C
Hc,max	Maximum hardiness (most hardy condition), genotype-specific constant	°C
Hc,min	Minimum hardiness (least hardy condition), constant	°C
ΔHc	Change in cold hardiness	°C
ka,eco	Acclimation rate during eco-dormancy	°C °C−1
ka,endo	Acclimation rate during endo-dormancy	°C °C−1
kd,eco	Deacclimation rate during eco-dormancy	°C °C−1
kd,endo	Deacclimation rate during endo-dormancy	°C °C−1
LTE50	Low-temperature exotherm, temperature lethal to 50 % of the population	°C
RMSE	Root mean square error	°C
Tmax	Maximum daily temperature	°C
Tmean	Mean daily temperature	°C
Tmin	Minimum daily temperature	°C
Tth,eco	Threshold temperature for calculating degree-days during eco-dormancy	°C
Tth,endo	Threshold temperature for calculating degree-days during endo-dormancy	°C