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Example SimulationsExample 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.
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Example 1: Multiple Trajectories
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
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Example 2: Back TrajectoryExample 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
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Example 3: Simple Dispersion
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
Example 3: InputsExample 3: Inputs
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To display the concentration results, choose Contours from the Concentration / Display / Concentration menu.
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Example 4: Simple Dispersion
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
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Example 5: MeteorologyExample 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.
Example 5: ResultsExample 5: Results
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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.
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