Search found 157 matches

by alicec
July 26th, 2019, 8:29 am
Forum: Dispersion Model
Topic: even if the option of the pollutant is set to continuous release but is not continuously released.
Replies: 13
Views: 753

Re: even if the option of the pollutant is set to continuous release but is not continuously released.

Thank you for explaining more.
Could you please attach your CONTROL, SETUP.CFG and MESSAGE file.
by alicec
July 25th, 2019, 9:45 am
Forum: Dispersion Model
Topic: even if the option of the pollutant is set to continuous release but is not continuously released.
Replies: 13
Views: 753

Re: even if the option of the pollutant is set to continuous release but is not continuously released.

Are you concerned by the concentration contours not being smooth? Please review the tutorial, in particular this portion. https://www.ready.noaa.gov/documents/Tutorial/html/conc_part.html Increasing the number of particles or making the concentration grid size larger will help. If you still have pro...
by alicec
July 19th, 2019, 3:57 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: help needed using mixed resolutions meteo files
Replies: 3
Views: 314

Re: help needed using mixed resolutions meteo files

Please also see the following documentation for more detail on how meteorological grids should be specified. It can get quite complex! https://www.ready.noaa.gov/hysplitusersguide/S262.htm - Number of input data grids Default: 1 Number of simultaneous input meteorological files. The following two en...
by alicec
July 19th, 2019, 3:12 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: help needed using mixed resolutions meteo files
Replies: 3
Views: 314

Re: help needed using mixed resolutions meteo files

Please use an additional gdas1 file so that there is an overlap in time between the two met datasets. See below for an example. HYSPLIT will automatically use the finer resolution (gdas0p5/ GHDA) during the overlap time. 2 03 01 00 00 1 42.768 -86.149 100.0 -24 0 10000.0 5 /tdir/gdas0p5/ 20120227_gd...
by alicec
July 19th, 2019, 10:39 am
Forum: Dispersion Model
Topic: even if the option of the pollutant is set to continuous release but is not continuously released.
Replies: 13
Views: 753

Re: even if the option of the pollutant is set to continuous release but is not continuously released.

Please see the user guide on how to set the number of particles emitted and the maximum number of particles allowed by the simulation. https://ready.arl.noaa.gov/hysplitusersguide/S623.htm You can also check the MESSAGE file to see if there is a warning that the maximum number of particles allowed w...
by alicec
July 15th, 2019, 10:39 am
Forum: Dispersion Model
Topic: even if the option of the pollutant is set to continuous release but is not continuously released.
Replies: 13
Views: 753

Re: even if the option of the pollutant is set to continuous release but is not continuously released.

It looks like you are only creating output at the deposition level.
So when you look at your contour plots, you are only seeing the deposition layer.

Num of vertical levels : 1
Height of levels(M agl) : 0


Try using at least two vertical levels, perhaps 0 and 100.


Alice
by alicec
July 9th, 2019, 10:00 am
Forum: Dispersion Model
Topic: Diameter (µm) Density (g/cc) and Shape
Replies: 6
Views: 517

Re: Diameter (µm) Density (g/cc) and Shape

You may find this technical report by Richard Dare useful. It explains the calculation of the terminal fall velocity of the particles in detail. https://cawcr.gov.au/technical-reports/CTR_079.pdf Here is a relevant section of the HYSPLIT user manual. You may also wish to consult the reference here. ...
by alicec
June 21st, 2019, 9:15 am
Forum: Dispersion Model
Topic: Time Step and Concentration Calculation
Replies: 35
Views: 1567

Re: Time Step and Concentration Calculation

There will be differences because the random numbers generated on the two systems will not be the same. To see this on the same system, you can set the SEED parameter in the SETUP.CFG (at least if you have a more recent version). https://ready.arl.noaa.gov/hysplitusersguide/S410.htm Try running with...
by alicec
June 19th, 2019, 9:19 am
Forum: Dispersion Model
Topic: the numbers of emitors
Replies: 5
Views: 362

Re: the numbers of emitors

The main output of a dispersion run is a binary file which we often refer to as a cdump file.
This file can be converted to ascii output as described here:
https://ready.arl.noaa.gov/hysplitusersguide/S341.htm
by alicec
June 19th, 2019, 9:13 am
Forum: Dispersion Model
Topic: Time Step and Concentration Calculation
Replies: 35
Views: 1567

Re: Time Step and Concentration Calculation

Try the following: 1. Repeat your runs with the deposition turned off. 2. Look and see how many particles HYSPLIT emitted. I think what you are running into is that HYSPLIT takes NUMPAR, number of particles to release, as a guide. When you go to the 24 hour emissions cycle, HYSPLIT wants to release ...