Example 6 Trajectory Ensemble

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Example 6Trajectory Ensemble

• Configure HYSPLIT to automatically run 27
  trajectories in an ensemble fashion (shifting the
  meteorology grid) from the chosen starting
  location.

Z
Y
X
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Run a trajectory ensemble with NAMF40 forecast
data from the Workshop archive.
Choose the Ensemble option and then click Next
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Choose Source Location
Enter a starting location at 40N and 85W
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Trajectory direction Backward
Start time 0000 UTC on 12/23/2005
Starting height 750 m AGL
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Submit the job and view the results
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The resulting plot (right) shows that 3 different
paths are possible depending on the selected
location in X, Y, and Z. This method gives the
user a sense of the sensitivity of the chosen
starting location within the meteorological grid
as well as an "envelope" of the uncertainty about
the single trajectory result.