Web-based Trajectory Tool

Plot a trajectory: Please try out this page and let us know what you think. We plan to improve the plotting capabilities as well as add more functionality such as multiple initial levels or locations. The code used to calculate the trajectories is kindly supplied by the University of Melbourne and details are on their Parcel Trajectory Software Home Page.

Trajectory Options:

? Dataset?
? Enter start date to end date (YYYY MM DD HH to YYYY MM DD HH) e.g. 1989 2 1 18.
For backwards, end date should be higher than start. You are currently limited to 60 time steps or about 15 days. HH should be 00,06,12, or 18
? Enter latitude/longitude and level: Lat (-90 to 90) Lon (-180 to 360) Select Level(s)

Plot Options:

?Markers drawn for every 6 hours: No: Yes:
?Select region
? If not default: Map type: :Polar Stereographic Cylindical Equidistant
? If custom: Lat1 to Lat2 (S to N) to : Lon1 to Lon2 to
go to error submittal form (Report Bugs)
Trajectory model and caveats:

Levels used are from 1000mb to 100mb. Input winds are available 4 times daily(0,6,12 and 18z). The trajectory model does not know about the surface and calculations can result in air moving down through the surface. Interpolated model output is used below the surface.

Note that trajectories that cross 180 can be drawn plotted incorrectly due to a NCL issue. You can download the kmz file and look at the trajectories in Google Earth or if you have the Google Earth browser API installed, you can view the trajectories there. I am working on a solution. Also, the labels for the lines are too big. A solution is being worked on.

Referencing Trajectory Code: The parcel trajectory software (traj3d) was obtained from the University of Melbourne Parcel Trajectory Software web page (http://www.cycstats.org/trajectories/trajhome.htm). A discussion of the algorithm is given by Noone and Simmonds (1999) and Barras and Simmonds (2009). Noone, D., and I. Simmonds, 1999: A three-dimensional spherical trajectory algorithm. Research Activities in Atmospheric and Oceanic Modelling, Report No. 28, WMO/TD-No. 942. H. Ritchie, Ed., World Meteorological Organization, 3.26-3.27. Barras, V., and I. Simmonds, 2009: Observation and modeling of stable water isotopes as diagnostics of rainfall dynamics over southeastern Australia Journal of Geophysical Research, 114, D23308, doi:10.1029/2009JD012132, 2009.

If you use plots or data from the page, we would also appreciate a reference: "Image provided by the NOAA-ESRL Physical Sciences Division, Boulder Colorado from their Web site at http://www.esrl.noaa.gov/psd/". Finally, you should reference the dataset that is used in the plot.

WRIT is supported in part by NOAA's Climate Goal and by the US Department of Energy's Office of Science (BER)
This is a Research and Development Application