Search found 432 matches

by alicec
March 28th, 2024, 10:38 am
Forum: Users
Topic: Default SETUP.CFG namelist file parameters
Replies: 2
Views: 29330

Re: Default SETUP.CFG namelist file parameters

MHRS, TOUT are only pertinent to the trajectory runs and have no meaning for a dispersion run. Therefore the defaults may be different - e.g. 0. KWET - Thanks for pointing out the discrepancy between the descriptions. There is an error in the Namelist variable section.  https://www.ready.noaa.gov/hy...
by alicec
March 28th, 2024, 10:35 am
Forum: Wildfire Smoke
Topic: Data Inputs needed for Smoke Concentration
Replies: 2
Views: 155524

Re: Data Inputs needed for Smoke Concentration

You need emissions data. You can specify complex emissions scenarios using an EMIT-TIMES file. https://www.ready.noaa.gov/documents/Tutorial/html/cust_emit.html HYSPLIT currently has three plume-rise options (see PLRISE in SETUP.CFG and https://acp.copernicus.org/articles/23/3083/2023/) https://www....
by alicec
March 21st, 2024, 3:49 pm
Forum: Wildfire Smoke
Topic: Hysplit on R studio:
Replies: 1
Views: 354

Re: Hysplit on R studio:

Could you provide more information.
In particular it would be nice to see your CONTROL file for the run and also whether you are running
trajectory or dispersion. What is in the resulting table?
by alicec
March 21st, 2024, 3:45 pm
Forum: Trajectory Model
Topic: Backward trajectory for odour sources
Replies: 1
Views: 2004

Re: Backward trajectory for odour sources

The short answer is yes, it could be used that way. For most applications one of the keys is to make sure the meteorological data which provides the wind fields to HYSPLIT is appropriate for the question you are trying to answer. For your application, the HRRR with 3km horizontal resolution may work...
by alicec
March 21st, 2024, 12:18 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Running decades using ERA5 ?
Replies: 1
Views: 923

Re: Running decades using ERA5 ?

Was it the downloading time that was the problem? The conversion itself should be pretty fast. Unfortunately I'm not sure of how to solve the problem of long download times. I think there are various ways you can try to subset the data to make it faster. https://confluence.ecmwf.int/display/CKB/How+...
by alicec
March 21st, 2024, 12:04 pm
Forum: HYSPLIT for PCs
Topic: executing HYSPLIT parallel
Replies: 1
Views: 2006

Re: executing HYSPLIT parallel

There are a few things that can help with executing multiple hysplit runs at the same time. 1. you can name your CONTROL and SETUP.CFG files with a suffix - CONTROL.suffix1 SETUP.suffix1, CONTROL.suffix2 SETUP.suffix2. Then you call the hysplit executable with (example shell scrip) /hysplit/exec/hyt...
by alicec
March 21st, 2024, 11:46 am
Forum: Dispersion Model
Topic: Pollutant Concentration
Replies: 1
Views: 164

Re: Pollutant Concentration

There are a good number of ways HYSPLIT can be utilized to model air pollutants which depends on what question you are trying to answer, what data you have regarding measurements and emissions estimates and so forth. I suggest using a literature search tool such as web of science and searching for s...
by alicec
December 4th, 2023, 9:39 am
Forum: Dispersion Model
Topic: Extracting data at specific location
Replies: 3
Views: 76979

Re: Extracting data at specific location

A couple thoughts 1. You release particles at 70m and are defining 10m vertical resolution on your concentration grid. To get non-zero concentrations in the first level, the material will need to mix downward to the first level. How quickly this happens depends on the meteorological conditions. So i...
by alicec
December 1st, 2023, 10:30 am
Forum: Dispersion Model
Topic: Utilizing Particle Size Characteristics
Replies: 1
Views: 46455

Re: Utilizing Particle Size Characteristics

Hello! You can define different 'species' in HYSPLIT. Each species (pollutant) has it's own emission rate, emission duration, release start time, https://www.ready.noaa.gov/hysplitusersguide/S312.htm Each one also has it's own deposition and gravitational settling parameters https://www.ready.noaa.g...
by alicec
December 1st, 2023, 10:19 am
Forum: Radiological
Topic: emission rate (CONTROL) and EMITIMES file
Replies: 1
Views: 69714

Re: emission rate (CONTROL) and EMITIMES file

Yes, if you are using an emit-times file then we recommend setting the emission rates in the CONTROL file to 0. If you are getting no concentrations then your emit-times file either isn't being read or isn't setup properly. If you look at the message file, you should see a line which indicates that ...

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