improver.cli.phase_change_level module
Script to calculate continuous phase change level.
- process(*cubes, phase_change, grid_point_radius=2, horizontal_interpolation=True, model_id_attr=None)[source]
Height of precipitation phase change relative to sea level.
Calculated as a continuous 2D field by finding the height above sea level at which the integral of wet bulb temperature matches an empirical threshold that is expected to correspond with the phase change.
- Parameters:
cubes (iris.cube.CubeList or list of iris.cube.Cube) –
- containing:
- wet_bulb_temperature (iris.cube.Cube):
Cube of wet bulb temperatures on height levels.
- wet_bulb_integral (iris.cube.Cube):
Cube of wet bulb temperature integrals calculated vertically downwards to height levels.
- orography (iris.cube.Cube):
Cube of the orography height in m.
- land_sea_mask (iris.cube.Cube):
Cube containing the binary land-sea mask. Land points are set to 1, sea points are set to 0.
phase_change (str) –
The desired phase change for which the altitude should be returned. Options are:
snow-sleet - the melting of snow to sleet. sleet-rain - the melting of sleet to rain. hail-rain - the melting of hail to rain.
grid_point_radius (int) – The radius in grid points used to calculate the maximum height of the orography in a neighbourhood to determine points that should be excluded from interpolation for being too close to the orographic feature where high-resolution models can give highly localised results. Zero uses central point only (neighbourhood is disabled). One uses central point and one in each direction. Two goes two points etc.
horizontal_interpolation (bool) – If True apply horizontal interpolation to fill in holes in the returned phase-change-level that occur because the level falls below the orography. If False these areas will be masked.
model_id_attr (str) – Name of the attribute used to identify the source model for blending.
- Returns:
Processed Cube of phase change altitude relative to sea level.
- Return type: