earthkit.climate.atmos.temperature.chill_portions¶
- earthkit.climate.atmos.temperature.chill_portions(tas: xarray.DataArray | str = 'tas', ds: xarray.Dataset | Any = None, *, freq: str = 'YS', **kwargs: Any) Any¶
Chill portions.
Chill portions are a measure to estimate the bud breaking potential of different crops. The constants and functions are taken from Luedeling et al. (2009) which formalises the method described in Fishman et al. (1987). The model computes the accumulation of cold temperatures in a two-step process. First, cold temperatures contribute to an intermediate product that is transformed to a chill portion once it exceeds a certain concentration. The intermediate product can be broken down at higher temperatures but the final product is stable even at higher temperature. Thus the dynamic model is more accurate than other chill models like the Chilling hours or Utah model, especially in moderate climates like Israel, California or Spain.
Units:
cp: dimensionless
This function wraps xclim.indicators.atmos.chill_portions.
- Parameters:
tas (
xarray.DataArray | str) – Hourly temperature.freq (
str) – Resampling frequency.ds (
xarray.Dataset | Any) – Input dataset.**kwargs (
Any) – Additional keyword arguments.
- Returns:
The computed index.
- Return type:
Any