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
Search found 433 matches
- March 18th, 2021, 8:45 am
- Forum: Dispersion Model
- Topic: Re: feeding emissions from spatial and temporal varying sources
- Replies: 5
- Views: 4361
- March 9th, 2021, 9:14 pm
- Forum: Users
- Topic: Reanalysis ARL Data FTP
- Replies: 1
- Views: 4228
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...
- March 4th, 2021, 9:55 am
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
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...
- March 4th, 2021, 9:46 am
- Forum: Trajectory Model
- Topic: Inconsistent back trajectory using HRRR 3k Met data
- Replies: 1
- Views: 2894
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
See this section of the tutorial.
https://www.ready.noaa.gov/documents/Tu ... _isob.html
- February 25th, 2021, 10:26 am
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
Re: Vertical Mass Distribution
Yes you are correct. opt-4 will over-ride the emission rate in line(12-2). https://www.ready.noaa.gov/hysplitusersguide/S310.htm If you specify opt-5, an area, then the initialization will randomly distribute particles over that area. The fortran random number generator is used for this purpose. If ...
- February 25th, 2021, 9:18 am
- Forum: Trajectory Model
- Topic: Monthly freqplots are the same b/t months and years
- Replies: 1
- Views: 3064
Re: Monthly freqplots are the same b/t months and years
You have a lot of steps here. Can you try to narrow down the point of failure? - make sure that the input into the program that creates the freqplots is correct - e.g. you are inputting different subsets of trajectories. - check that all your trajectories ran correctly. you can spot compare some tra...
- February 17th, 2021, 4:16 pm
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
Re: Vertical Mass Distribution
A few observations -Your source locations are only 1m above the ground. You may want to revisit this choice. https://www.ready.noaa.gov/hysplitusersguide/S310.htm -you are using ichem=5 https://www.ready.noaa.gov/hysplitusersguide/S628.htm If you use ichem=5, then whole particles are deposited rathe...
- February 16th, 2021, 8:35 am
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
Re: Vertical Mass Distribution
HYSPLIT calculates number of particle it releases on numpar as well as a few other factors
such as number of release locations, number of release cycles, number of types of computational particles.
It will often not release exactly numpar particles.
such as number of release locations, number of release cycles, number of types of computational particles.
It will often not release exactly numpar particles.
- February 12th, 2021, 10:14 am
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
Re: Vertical Mass Distribution
You are correct. There will be some differences between simulations made with different numbers of particles or started with a different random seed. You can find some discussion of the expected uncertainties and how to estimate how many particles you need in this publication section 2.4. https://ww...
- February 12th, 2021, 10:05 am
- Forum: Dispersion Model
- Topic: Vertical Mass Distribution
- Replies: 20
- Views: 28874
Re: Vertical Mass Distribution
I have reproduced your problem with the large number of particles and am in the process of tracking down the cause. WIth only 2,880,000 you can see below that the mass (most right column) increases with time until 6 hours which it should be doing as you specified a 6 hour emission time period. NOTIC...