lcl()
definition thermo_parcel_path(vector t_profile, vector td_profile, vector p_profile, definition start_condition)
definition thermo_parcel_path(thermo_profile profile, definition start_condition)
Computes the path of an ascending thermodynamic parcel with the given start condition for the given vertical profile. It returns a definition suitable for plotting all the details of the parcel path into a thermodynamic diagram. The vertical profile is either specified as a set of vectors where:
- t_profile: the temperature profile (in K or °C)
- td_profile: the dew point temperature profile (in K or °C)
- p_profile: the pressure profile (in Pa or hPa)
or as a vertical profile where:
- profile: the result of a vertical profile extraction from GRIB or BUFR with the thermo_grib() or thermo_bufr() functions, respectively.
The start_condition definition can specify these four different modes:
| Mode | Definition |
|---|---|
Surface The parcel is started from the surface, i.e. the lowest point of the profile. | (mode: 'surface') |
Custom The parcel is started from the given temperature, dewpoint and pressure. | (mode: 'custom', t: start_temperature, td: start_dewpoint, p: start_pressure) |
Mean layer The parcel is started from the mean temperature, dew point and pressure of a given pressure layer. Please note that when | (mode: 'mean_layer', p_top: layer_top, p_bottom: layer_bottom ) |
Most unstable The parcel is started from the most unstable condition. To determine this, a parcel is started from all the points along the profile in a specified pressure layer. The staring position of the parcel resulting in the highest CAPE value define the most unstable start condition. Please note that when | (mode: 'most_unstable', p_top: layer_top, p_bottom: layer_bottom ) |
The result