Search found 279 matches

by alicec
February 25th, 2021, 10:26 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

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 ...
by alicec
February 25th, 2021, 9:18 am
Forum: Trajectory Model
Topic: Monthly freqplots are the same b/t months and years
Replies: 1
Views: 55

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...
by alicec
February 17th, 2021, 4:16 pm
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

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...
by alicec
February 16th, 2021, 8:35 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

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.
by alicec
February 12th, 2021, 10:14 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

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...
by alicec
February 12th, 2021, 10:05 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

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...
by alicec
February 11th, 2021, 9:14 am
Forum: Developers
Topic: Changing particle properties in HYSPLIT
Replies: 4
Views: 117

Re: Changing particle properties in HYSPLIT

This section of the tutorial shows how to get to this menu.
https://www.ready.noaa.gov/documents/Tu ... _volc.html
by alicec
February 10th, 2021, 11:03 am
Forum: Developers
Topic: Changing particle properties in HYSPLIT
Replies: 4
Views: 117

Re: Changing particle properties in HYSPLIT

Please see this section of the user guide and let us know if this answers your question.

https://ready.arl.noaa.gov/hysplitusersguide/S314.htm
by alicec
February 10th, 2021, 10:58 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

Re: Vertical Mass Distribution

Could you please try running with a smaller number of particles to see if the problem persists. I reproduced your run with 288,000 particles and was unable to reproduce the problem. See below. Please let us know. Index Height %Mass 11 3360.0 0.23 10 2755.0 1.77 9 2210.0 10.20 8 1725.0 21.00 7 1300.0...
by alicec
February 8th, 2021, 12:05 pm
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 14
Views: 367

Re: Vertical Mass Distribution

Can you please attach your CONTROL and SETUP.CFG file you used for the run so we can reproduce the problem.
Thanks.