Search found 289 matches

by alicec
April 15th, 2021, 10:27 pm
Forum: Users
Topic: Concentration / Utilities / Convert to ASCII not outputting vertical heights
Replies: 1
Views: 86

Re: Concentration / Utilities / Convert to ASCII not outputting vertical heights

If you run with multiple levels defined in your concentration grid then the con2asc output will have multiple columns. It looks like you currently have one particle species defined (TEST) and the 05000 indicates that is concentration from ground to 5000m. If you defined another level (maybe 6000m) t...
by alicec
April 15th, 2021, 10:15 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Archived gdas1 and gb1 profile discrepancy
Replies: 1
Views: 35

Re: Archived gdas1 and gb1 profile discrepancy

ARL does not create this dataset.
https://www.ready.noaa.gov/gbl_reanalysis.php
You may want to contact NCEP/NCAR with any concerns.
https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html
by alicec
April 15th, 2021, 9:51 pm
Forum: Dispersion Model
Topic: feeding emisions from spatial and temporal variaying sources
Replies: 3
Views: 541

Re: feeding emisions from spatial and temporal variaying sources

You should use ninit=2 because you don’t want to remove particles that were added previously. ----------------------------------------------------------------------------------------- Example. You want to emit 100 g of mass over 1 hour at a constant rate. Set the model time step to 5 minutes (DELT=5...
by alicec
April 12th, 2021, 8:16 pm
Forum: Dispersion Model
Topic: Particle Shape Factor
Replies: 1
Views: 81

Re: Particle Shape Factor

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
March 30th, 2021, 1:00 pm
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 20
Views: 1040

Re: Vertical Mass Distribution

Can you attach the MESSAGE file from the HYSPLIT run?
Thank you.
by alicec
March 25th, 2021, 8:56 am
Forum: Chemicals
Topic: Converting output of dispersion model into vertical profile of chemical concentration at different heights
Replies: 2
Views: 166

Re: Converting output of dispersion model into vertical profile of chemical concentration at different heights

Do the outputs from the dispersion model contain details of the concentrations at different heights, or just one value for the averaged concentration up to a certain height? As I understand from looking at the plots produced by the model it should be the latter, but the former is what I require, th...
by alicec
March 18th, 2021, 8:45 am
Forum: Dispersion Model
Topic: feeding emisions from spatial and temporal variaying sources
Replies: 3
Views: 541

Re: feeding emisions from spatial and temporal variaying sources

Description of the pardump/parinit file is here.
https://www.ready.noaa.gov/hysplitusersguide/S442.htm

There is python code with a class that can read/write pardump files here in pardump.py.
https://github.com/noaa-oar-arl/monetio ... tio/models
by alicec
March 9th, 2021, 9:14 pm
Forum: Users
Topic: Reanalysis ARL Data FTP
Replies: 1
Views: 221

Re: Reanalysis ARL Data FTP

Which reanalysis are you looking for? It may be under "archive". Otherwise you can download the files from our ftp server. https://www.ready.noaa.gov/READYmetdata.php You can find some instructions here. https://hysplitbbs.arl.noaa.gov/viewtopic.php?f=25&t=1526&p=4402&hilit=winscp#p4402 https://hysp...
by alicec
March 4th, 2021, 9:55 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 20
Views: 1040

Re: Vertical Mass Distribution

I'm not sure I understand the question. HYSPLIT will create/emit new computational particles at every time step during the emission time period. When the emission routine is called at each time step, it distributes the new particles over the specified area by adding a randomly chosen displacement to...
by alicec
March 4th, 2021, 9:46 am
Forum: Trajectory Model
Topic: Inconsistent back trajectory using HRRR 3k Met data
Replies: 1
Views: 200

Re: Inconsistent back trajectory using HRRR 3k Met data

You may be running into terrain with the 3km HRRR at the 100m height
See this section of the tutorial.
https://www.ready.noaa.gov/documents/Tu ... _isob.html