Search found 83 matches

by christopher.loughner
August 22nd, 2023, 8:40 am
Forum: Dispersion Model
Topic: Vehicle emission concentration
Replies: 5
Views: 20612

Re: Vehicle emission concentration

1) For area sources, you want to use an EMITIMES file. See directions on how to setup an EMITIMES file in the user guide: https://www.ready.noaa.gov/hysplitusersguide/S417.htm Creating and using an EMITIMES file is also discussed in the online HYSPLIT Basic Tutorial: https://www.ready.noaa.gov/HYSPL...
by christopher.loughner
October 31st, 2022, 2:58 pm
Forum: Dispersion Model
Topic: WRF27 average wind
Replies: 2
Views: 3294

Re: WRF27 average wind

Thanks for letting us know about these files. We updated these files and they are now available on our archive.
by christopher.loughner
July 12th, 2022, 9:45 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Don't use WRF 27 km mass coupled time averaged files with HYSPLIT Version 4
Replies: 0
Views: 32219

Don't use WRF 27 km mass coupled time averaged files with HYSPLIT Version 4

Note that there are two versions of the WRF 27 km ARL meteorology files (https://www.ready.noaa.gov/data/archives/wrf27km/README.TXT). One set of files contain instantaneous wind velocities and the other mass coupled time average wind velocities. The set of files with mass coupled time averaged wind...
by christopher.loughner
June 17th, 2022, 9:42 am
Forum: 11. Pollutant transformations and deposition
Topic: Non-linearities in reaction rates
Replies: 2
Views: 17732

Re: Non-linearities in reaction rates

Yes, if you can generate an estimate of the real reaction mechanism and create an approximate first-order rate that gives a good representation of that overall rate, then I think you can try to do something in HYSPLIT. However, if you really want to do a lot of complex chemistry, it may be best to u...
by christopher.loughner
June 16th, 2022, 10:03 am
Forum: 7. Air concentration calculations
Topic: Spacing Lat, Lon
Replies: 3
Views: 13710

Re: Spacing Lat, Lon

This will be covered shortly during the Chapter 12 presentation. The concentration grid resolution can be finer than the meteorology. The main consideration for choosing the concentration grid resolution is to make sure it is not too high of a resolution that undersampling will occur based on the nu...
by christopher.loughner
June 15th, 2022, 4:34 pm
Forum: 9. Air concentration parameter sensitivity
Topic: Vertical turbulence choices
Replies: 1
Views: 11040

Re: Vertical turbulence choices

We have yet to identify one particular turbulence parameterization that consistently performs statistically better than other options for a particular location.

Later in the workshop (Chapter 12) we will go over how to use a range of model options to create an ensemble.
by christopher.loughner
June 15th, 2022, 4:05 pm
Forum: 17. Custom simulations
Topic: FMDV simulation
Replies: 3
Views: 19782

Re: FMDV simulation

Foot and mouth disease virus will not be covered in this workshop. Information on how to simulate FMDV through the atmosphere in HYSPLIT is outlined here: https://www.ready.noaa.gov/hysplitusersguide/S419.htm A HYSPLIT FMDV simulation is covered in the advanced HYSPLIT tutorial here: http://ready.ar...
by christopher.loughner
June 14th, 2022, 2:51 pm
Forum: 5. Trajectory options
Topic: Changing density of MATRIX trajectories
Replies: 4
Views: 21225

Re: Changing density of MATRIX trajectories

Alice's suggestion above of only changing the third location will change the density and number of trajectories and keep the same spatial boundary.
by christopher.loughner
November 18th, 2021, 11:35 am
Forum: Dispersion Model
Topic: dispersion simulation for future emission events
Replies: 1
Views: 5177

Re: dispersion simulation for future emission events

If you have meteorological-climate model simulation output, then you can convert the output to create ARL files for input into HYSPLIT. The HYSPLIT modeling system comes with several meteorological converters for doing this.

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