Example 3 Integration Error

1
Example 3Integration Error

• Compute a backward trajectory starting from the
  example 2 trajectory endpoint to investigate the
  integration error.

2
Find the last latitude, longitude, and height AGL
from the endpoints file in Example 2 to be used
as the starting location.
3
Run a backward trajectory with NAMF40 forecast
data from the Workshop archive again.
4
Enter the starting location of 69.866N and 16.833W
5
Allow transfer to/from the GFS.
Trajectory direction Backward
Vertical motion method Isobaric
Start time 0000UTC 12/23
Total run time 84 hours
Starting height 2797.8 m AGL
Vertical plot height units Pressure
6
Submit the job and view the results
7
Backward Trajectory
Forward Trajectory
Forward Backward Trajectories
This plot was created by reading both the forward
and backward trajectory endpoints files into the
PC HYSPLIT display GUI (this is feature is not
available using HYSPLIT-WEB). Note that this
case had very little integration error since the
backward trajectory returned to the origin of the
forward trajectory.