CATData#

class rojak.core.data.CATData(dataset, pressure_level_prefix, *, persist=True)[source]#

CATPrognosticData extended with the derived quantities required by CAT diagnostics

This is the concrete interface that MetData.to_clear_air_turbulence_data() must return: every MetData source is required to be able to produce one of these, which is what lets rojak.turbulence diagnostics work against any data source uniformly.

Each derived quantity is computed lazily on first access and cached thereafter (and persisted, unless constructed with persist=False).

Parameters:

dataset (Dataset)
pressure_level_prefix (float)
persist (bool)

__init__(dataset, pressure_level_prefix, *, persist=True)[source]#

See CATPrognosticData.__init__()

Parameters:

dataset (Dataset)
pressure_level_prefix (float)
persist (bool)

Return type:

None

Methods

`__init__`(dataset, pressure_level_prefix, *)	See `CATPrognosticData.__init__()`
`altitude`()	Altitude
`divergence`()	Horizontal divergence of wind in m/s
`geopotential`()	Geopotential in m^2/s^2
`ice_supersaturated_regions`([rhi_threshold])	Boolean mask of ice-supersaturated regions (ISSR), see `rojak.atmosphere.contrails.issr()`
`issr_along_path`(lon_points, lat_points[, ...])	Boolean mask of ice-supersaturated regions (ISSR), interpolated onto a path of longitude/latitude points
`jacobian_horizontal_velocity`()	Determinant of the Jacobian of the horizontal velocity field, i.e. du/dx * dv/dy - du/dy * dv/dx.
`potential_temperature`()	Potential temperature, see `rojak.turbulence.calculations.potential_temperature()`
`potential_vorticity`()	Potential vorticity
`pressure_level`([convert_to_pascals])	Pressure level coordinate
`shear_deformation`()	Shear deformation, see `rojak.turbulence.calculations.shearing_deformation()`
`specific_humidity`()	Specific humidity
`specific_velocity_derivative`(target_derivative)	A single component of `velocity_derivatives()`
`stretching_deformation`()	Stretch deformation, see `rojak.turbulence.calculations.stretching_deformation()`
`temperature`()	Air temperature in Kelvin
`time_window`()	Minimum and maximum values of the time coordinate
`total_deformation`()	Total deformation, see `rojak.turbulence.calculations.total_deformation()`
`u_wind`()	Zonal (eastward) wind speed in m/s
`v_wind`()	Meridional (northward) wind speed in m/s
`velocity_derivatives`()	All four horizontal velocity derivatives, see `rojak.core.derivatives.vector_derivatives()`
`vorticity`()	Vertical component of vorticity in m/s

Attributes

`required_coords`
`required_variables`