# Presentation: 056167

## Workshop Agenda

- PC-HYSPLIT WORKSHOP

| Model Overview
 Model history and features
 Computational method
 Trajectories versus concentration
 Code installation
 Model operation
 Example calculations
 Updating HYSPLIT

Meteorological Data
 Data requirements
 Forecast data FTP access
 Analysis data FTP access
 Display grid domain
 Vertical profile
 Contour data
             Examples 1-5
Particle Trajectory Methods
 Trajectory computational method
 Trajectory example calculation
 trajectory model configuration
 Trajectory error
 Multiple trajectories
 Terrain height
  Meteorological analysis along a trajectory
 Vertical motion options | Pollutant Plume Simulations
 Modeling particles or puffs
 Concentration prediction equations
 Turbulence equations
 Dispersion model configuration
 Defining multiple sources
 Simulations using emission grids
 Concentration and particle display options
 Converting concentration data to text files
 Example local scale dispersion calculation
Special Topics
 Automated trajectory calculations
 Trajectory cluster analysis
 Concentration ensembles
 Chemistry conversion modules
 Pollutant deposition
 Source attribution using back trajectory analysis
 Source attribution using source-receptor matrices
 Source attribution functions
 GIS Shapefile output
 KML/KMZ output
 Customizing map labels
 Scripting for automated operations
Extra Topics
 Modeling PM10 emissions from dust storms
 Restarting the model from a particle dump file |
| --- | --- |

## Modeling PM10 emissions from dust storms

- HYSPLIT contains a PM10 emission algorithm that will emit particles from grid-cells with a desert land-use classification and a friction velocity that exceeds a certain threshold value. (More detail on this approach can be found in the on-line HYSPLIT references.)
- To set up the model for such a simulation, an approach similar to the matrix configuration is employed. Set up two starting locations representing the domain limits over which dust will be emitted and set a third to represent the grid resolution.
- For this example, we will run the model for a region over North Africa in late February of 2000, during one of the _[largest dust storms](http://jwocky.gsfc.nasa.gov/aerosols/africa/canary.html)_ ever captured by the SeeWiFS satellite (26 Feb 2000, 28 Feb 2000).

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## Modeling PM10 emissions from dust storms

- Set up the model to run for the 3 locations at right, starting at 0000 UTC 23 February 2000, for a duration of 4 days (96 hrs).
- Use the **FNLDUST.bin** archive data and set the concentration grid resolution to 0.2 degrees and the span to 50.0 lat. and 100.0 lon. to speed up the calculation.
- The emission duration should be set to 1 unit/hr for 48 hours and set the model to output a _snapshot _after 24 hours between the ground and 100 m-agl.

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## Modeling PM10 emissions from dust storms

- The initial **CONTROL** file will only have 3 starting locations.
- From the **Advanced / Configuration Setup / Concentration / In-line Chemical CONVERSION MODULES** menu, set the conversion module to **Enable the PM10 dust storm emission algorithm for desert landuse**.
- Also, output a particle dump file after **96** hours and set the model type to **500 3D particle horizontal and vertical **in the **Advanced / Configuration Setup / Concentration **menu.
- The particle dump output file will also be used in the next example.
- Save the configuration and go to the next slide.

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## Modeling PM10 emissions from dust storms

- The HYSPLIT dust model is run from the **Run Dust Storm** tab of the **Concentration / Special Runs** menu.
- This causes the execution of a pre-processor that writes out the value of all the desert land-use locations to the **CONTROL** file that will be used for the simulation.
- Only grid cells where the friction velocity exceeds the threshold value will emit dust particles.
- Upon completion of the simulation use the **Particle Display** program to show the dust distribution (lower left), which is very similar to the satellite image from the 26th (lower right).

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## Restarting the model from a particle dump file

- The **Particle Editor / Edit / View** tab from the **Advanced** menu has several built-in functions.
- In addition to viewing the particles from the particle dump file, it can also be used to move those particles to a different location, and then re-write the file.  The model simulation can then be restarted from the adjusted particle dump file from the configuration menu, which can be useful if the forecast did not position the particles in the location observed and you want to start the next day's forecast from where they were observed.
- The menu opens a blank map with several buttons across the top.
- Selecting **File** opens the particle dump file (default is the last created particle dump file).

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## Restarting the model from a particle dump file

- In this example, choose the **PARDUMP** file created in the dust storm example.
- Particle densities are shown at one-degree resolution.
- Zoom the image by selecting **Zoom**  from the **Edit **drop-down menu.  Select a box around the area of interest with the left mouse button and release to zoom.

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## Restarting the model from a particle dump file

- Next, exit from the particle editor and choose **NASA TOMS** from the **Advanced / FTP Satellite Data** menu.
- A TOMS aerosol index file can be automatically downloaded from the NASA web site (lower right), or a NOAA AVHRR file of optical depth over the oceans can be downloaded from NOAA, if available (more details on these files is provided in the User’s Guide).
- Enter a valid email address, fill in the blanks for the February 27, 2000 data, and then click on **Get Data File**.
- When the ftp is finished, click on the **continue** button.

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## Restarting the model from a particle dump file

- Return to the particle editor and load the **PARDUMP** file again.
- Now, add the TOMS image by choosing **TomsFile** from the **Background** menu tab and then selecting the file just downloaded (*ga000227.txt*).
- Loading the TOMS image for February 27th and zooming in yields a picture remarkably similar to the model calculation, including a dust plume over east central Africa. \
- The HYSPLIT plume can be turned on and off by repeatedly clicking on the **Cloud On/Off** button.

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- HYSPLIT

- TOMS Image

## Restarting the model from a particle dump file

- In this example the model and measurements are so close that not much adjustment to the particles is necessary. However, to move a small area of HYSPLIT particles , choose **Part Shift / Select Area** from the **Edit** menu to select a box around the area to be moved. In this example, the particles off the southwest coast of Africa will be shifted northeast to better match the TOMS image.
- Next, choose **New Pos** from the **Part Shift** menu and click the mouse near the center of the box and drag to the northeast creating an arrow.
- After releasing the mouse button the particles will be moved to the northeast.
- You can undo the change by selecting **Undo New Pos** from the **Part Shift** menu.
- When finished, click on **Complete Area Shift** to finish moving the particles.
- Finally, choose **Save As** from the **File** menu to save the particle positions to a new PARDUMP file. This file can be used to restart HYSPLIT (see the HYSPLIT User's Guide for more details).

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