Search found 433 matches
- August 9th, 2019, 4:34 pm
- Forum: Dispersion Model
- Topic: Deposition Velocity
- Replies: 4
- Views: 3877
Re: Deposition Velocity
If I understand what you are saying correctly, then yes, you are correct. If you define a constant settling velocity for the particle (by specifying the deposition velocity for a 'particulate' computational particle), then you over-ride the calculation and the settling velocity is the value that you...
- August 9th, 2019, 10:12 am
- Forum: Dispersion Model
- Topic: PARINIT vs. EMITIMES
- Replies: 7
- Views: 8051
Re: PARINIT vs. EMITIMES
The PARINIT file basically contains a list of computational particles with their relevant characteristics. (Time, location, mass, etc.) With NINIT=1, HYSPLIT opens the file at the beginning of the simulation and looks for particles with the same time as the run start. If it finds some, then it reads...
- August 8th, 2019, 3:20 pm
- Forum: Dispersion Model
- Topic: even if the option of the pollutant is set to continuous release but is not continuously released.
- Replies: 13
- Views: 10557
Re: even if the option of the pollutant is set to continuous release but is not continuously released.
Please review the tutorial to understand how changing the particle number affects results.
Section 7 is particularly relevant.
https://ready.arl.noaa.gov/documents/Tu ... _test.html
Section 7 is particularly relevant.
https://ready.arl.noaa.gov/documents/Tu ... _test.html
- July 31st, 2019, 6:45 pm
- Forum: Dispersion Model
- Topic: Deposition Velocity
- Replies: 4
- Views: 3877
Re: Deposition Velocity
This section of the tutorial may help you. https://www.ready.noaa.gov/documents/Tutorial/html/chem_linear.html If particle diameter, density, and shape are all 0, then the computational particle is treated as a gas and no gravitational settling is applied, but dry deposition may occur when the compu...
- July 29th, 2019, 1:33 pm
- Forum: Dispersion Model
- Topic: Diameter (µm) Density (g/cc) and Shape
- Replies: 6
- Views: 6488
Re: Diameter (µm) Density (g/cc) and Shape
The lat lon coordinate for the HYSPLIT concentration grid is generally the center of the cell (for computational particles on a square concentration grid). Met data output is valid for the point at which it is output. For computational particles which are between met grid points, the met data is int...
- July 29th, 2019, 7:43 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: 10557
Re: even if the option of the pollutant is set to continuous release but is not continuously released.
Yes - you are exceeding the number of particles / puffs allowed. That is what this warning in the MESSAGE file means. WARNING emspnt: exceeding puff limit WARNING depsus: exceeding puff limit NOTICE main: 168 58515839 10000 2.6298373E+14 WARNING emspnt: exceeding puff limit HYSPLIT will not emit mor...
- 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: 10557
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.
Could you please attach your CONTROL, SETUP.CFG and MESSAGE file.
- 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: 10557
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...
- 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: 4571
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...
- 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: 4571
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...