I was wondering if it was possible to find further information about the vertical motion method for trajectories, especially for average data and damped magnitude.
thank your
Vertical motion method
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barbara.stunder
- Posts: 451
- Joined: November 9th, 2012, 4:23 pm
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Re: Vertical motion method
See section 4.8 in the HYSPLIT training material about trajectory vertical motion at http://www.meteozone.com/home/tutorial/html/index.html
Also, this is from the hysplit4\html\S212.htm file:
Vertical Motion Methods
The trajectory vertical motion method is set by a single digit in the CONTROL file. This method would apply to all meteorological data files. The default value is to use the vertical velocity data fields supplied with the meteorologcal model data.
1 0 = uses the data fields from the meteorological model
2 1 = isobaric follows constant pressure surfaces
3 2 = isentropic follows potential temperature surfaces
4 3 = the calculation follows constant density surfaces
5 4 = isosigma follows the internal terrain following coordinate system, the closest approximation to no vertical velocity
6 5 = computes the vertical velocity by integrating the divergence
7 6 = assumes the vertical velocities are relative to MSL which are remapped to AGL
8 7 = horizontally averages the vertical velocities to be consistent with the temporal frequency of the data
9 8 = damps the magnitude of the vertical velocity based upon the ratio of data frequency to grid size
Note that methods 1,2,3,4 are only approximations. Instead of remapping the data fields to these surfaces, a vertical velocity is computed that would maintain the trajectory on the selected surface.
Also, this is from the hysplit4\html\S212.htm file:
Vertical Motion Methods
The trajectory vertical motion method is set by a single digit in the CONTROL file. This method would apply to all meteorological data files. The default value is to use the vertical velocity data fields supplied with the meteorologcal model data.
1 0 = uses the data fields from the meteorological model
2 1 = isobaric follows constant pressure surfaces
3 2 = isentropic follows potential temperature surfaces
4 3 = the calculation follows constant density surfaces
5 4 = isosigma follows the internal terrain following coordinate system, the closest approximation to no vertical velocity
6 5 = computes the vertical velocity by integrating the divergence
7 6 = assumes the vertical velocities are relative to MSL which are remapped to AGL
8 7 = horizontally averages the vertical velocities to be consistent with the temporal frequency of the data
9 8 = damps the magnitude of the vertical velocity based upon the ratio of data frequency to grid size
Note that methods 1,2,3,4 are only approximations. Instead of remapping the data fields to these surfaces, a vertical velocity is computed that would maintain the trajectory on the selected surface.
Re: Vertical motion method
Under strong inversion condition, which method is appropriate to use? Thanks.