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Atmospheric Dispersion Simulations Workshop

Explore trajectory and dispersion simulations with meteorological data examples using PC-HYSPLIT. Run examples and view results to understand model workings and settings. Workshop covers various scenarios and visualization techniques.

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Atmospheric Dispersion Simulations Workshop

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  1. Example Simulations Presented on the following slides are several basic trajectory and dispersion simulations and meteorological data display examples that you can run prior to viewing section 3 and 4 of the presentation. Sections 3 and 4 will delve more deeply into the inner workings of the model and advanced settings of the GUI. The first slide of each example will present the problem to be answered, the next few slides will show the GUI inputs, and the last slide will show the resulting map. It is recommended to click on the Reset button of the main HYSPLIT menu before proceeding in order to clear out any old cases in the working directory. Note: These runs were produced using HYSPLIT version 4.9 (released February 2009). Slight differences are possible with older/newer versions of the model. PC-HYSPLIT WORKSHOP

  2. Example 1: Multiple Trajectories Source Location: Houston, Texas (29.65N, 95.28W) @ 10 and 750 meters AGL Date/Time: February 17, 2009 @ 1200 UTC (can use default zeros) Duration: Forward 48 hours Meteorology: NAM 40 km Display: Zoom set to 80% Endpoint labels every 6 hours Vertical display coordinate set to Meters-agl Optional Google Earth PC-HYSPLIT WORKSHOP

  3. Example 1: Inputs PC-HYSPLIT WORKSHOP

  4. Example 1: Results PC-HYSPLIT WORKSHOP

  5. Example 2: Back Trajectory Source Location: Atlanta, Georgia (33.65N, 84.42W) @ 750 meters AGL Date/Time: February 20, 2009 @ 0600 UTC Duration: Backward 72 hours Meteorology: GFS Display: Zoom set to 80% Endpoint labels every 12 hours Vertical display coordinate set to Meters-agl Optional Google Earth PC-HYSPLIT WORKSHOP

  6. Example 2: Inputs PC-HYSPLIT WORKSHOP

  7. Example 2: Results PC-HYSPLIT WORKSHOP

  8. Example 3: Simple Dispersion Source Location: New Orleans, LA (30.05N, 90.03W) @ 10 meters AGL Source Duration: 1 unit/hr source emission for 2 hours Date/Time: February 18, 2009 @ 1200 UTC Duration: Forward, 6 hours Output: 6-hour average concentration between the surface and 100 meters Grid Spacing: 0.05 degrees latitude and longitude Grid Span: 20.0 degrees latitude and longitude Deposition: None Meteorology: hysplit.t12z.namsf.SEtile (NAM 12 km SE US tile) Display: Zoom set to 50% Optional Google Earth PC-HYSPLIT WORKSHOP

  9. Example 3: Inputs PC-HYSPLIT WORKSHOP

  10. Example 3: Inputs PC-HYSPLIT WORKSHOP

  11. Example 3: Inputs To display the concentration results, choose Contours from the Concentration / Display / Concentration menu. PC-HYSPLIT WORKSHOP

  12. Example 3: Results PC-HYSPLIT WORKSHOP

  13. Example 4: Simple Dispersion Source Location: New Orleans, LA (30.05N, 90.03W) @ 10 meters AGL Source Duration: 1 unit/hr source emission for 2 hours Date/Time: February 18, 2009 @ 1200 UTC Duration: Forward, 4 hours Output: 30-minute average concentration between the surface and 100 m Grid Spacing: 0.01 degrees latitude and longitude Grid Span: 10.0 degrees latitude and longitude Deposition: None Meteorology: hysplit.t12z.namsf.SEtile (NAM 12 km SE US tile) Display: Zoom set to 90% Add four 50 km rings Add county map background (file map_county) Fix exponential contours Optional: Create animated gif image PC-HYSPLIT WORKSHOP

  14. Example 4: Inputs PC-HYSPLIT WORKSHOP

  15. Example 4: Inputs PC-HYSPLIT WORKSHOP

  16. Example 4: Inputs PC-HYSPLIT WORKSHOP

  17. Example 4: Results PC-HYSPLIT WORKSHOP

  18. Example 5: Meteorology From the last case, explore the wind field near the source location. Source Location: New Orleans, LA (30.05N, 90.03W) Date/Time: February 18, 2009 beginning @1200 UTC Meteorology: hysplit.t12z.namsf.SEtile (NAM 12 km SE US tile) Display: 1) Show 10 meters wind vector maps every 3 hours beginning 1200 UTC February 18 (see next page for defaults). 2) Hourly profile output at source location beginning @1200 UTC using the Polar coordinate system to show wind direction and speed. (This may take a few minutes to generate.) Notes: The NAM dataset begins with February 17, 2009 @ 1200 UTC and has data every hour, which can be determined by running Check File. PC-HYSPLIT WORKSHOP

  19. Example 5: Contour Inputs PC-HYSPLIT WORKSHOP

  20. Example 5: Results Approximate source location (not displayed on original map) Note that the winds are initially from the SSW, but then come from the WNW by 0600 UTC on February 19. PC-HYSPLIT WORKSHOP

  21. Example 5: Profile Inputs PC-HYSPLIT WORKSHOP

  22. Example 5: Results • Wind Direction and Speed at 1010 hPa • Date/Time WDIR WSPD • 18/1200203.07.7 • 18/1500212.99.7 • 18/1800 223.310.4 • 18/2100 231.910.0 • 19/0000 229.6 9.5 • 19/0300 248.1 7.0 • 19/0600 261.4 6.7 • 19/0900 317.2 6.2 • 19/1200 286.5 8.8 PC-HYSPLIT WORKSHOP

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