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  • Required: In addition to the air parcel time, Met.3D requires the two attributes trajectory_starttime and forecast_inittime for the time variable that define the time at which the trajectory was started, as well as the forecast initialisation/base time of the forecast data on which the trajectory was computed.
  • Required: The vertices/particle positions of the trajectories need to specified in the variables lon, lat, and pressure.
  • Optional: Additional variables traced along the trajectories (e.g., temperature in the example above) need to be identifyable by the attribute auxiliary_data = "yes".
    • You can put an arbitrary number of auxiliary trace variables into your file.
  • Optional: The start_lon, start_lat and start_isobaric variables are optional and define the grid from which the trajectory bundle was started (used for WCB detection).
  • Optional: Similarly, the time_interval and delta_pressure_per_time_interval variables are optional and define pre-computed values for WCB detection. Contact us if you’re interested.

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