Search found 286 matches

by alicec
February 16th, 2021, 8:35 am
Forum: Dispersion Model
Topic: Vertical Mass Distribution
Replies: 20
Views: 1003

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: 20
Views: 1003

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: 20
Views: 1003

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: 510

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: 510

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: 20
Views: 1003

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: 20
Views: 1003

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.
by alicec
January 4th, 2021, 10:01 am
Forum: Conversion programs
Topic: ERA5 dataset
Replies: 14
Views: 9094

Re: ERA5 dataset

Thanks for updating and sharing your scripts. A few thoughts. With the new cdsapi you do not need to have separate files for the analysis and forecast surface data. The new api allows you to retrieve both types of variables into the same file (The old api did not). The era52arl program can still ing...
by alicec
December 18th, 2020, 11:54 am
Forum: Conversion programs
Topic: ERA5 dataset
Replies: 14
Views: 9094

Re: ERA5 dataset

I reproduced your problem by downloading files using the request code that you have posted.
It looks like your request results in a file with
gridType = sh
please modify your request so
gridType = regular_ll

See some examples of requests at
https://github.com/amcz/hysplit_metdata
by alicec
December 17th, 2020, 10:33 pm
Forum: Conversion programs
Topic: ERA5 dataset
Replies: 14
Views: 9094

Re: ERA5 dataset

Can you make sure that you are using the most up to date era52arl code? You can get it from github as well as the lastest HYSPLIT release. https://github.com/amcz/hysplit_metdata I have also added some sample code in the README. For the pressure level data I am using the 'reanalysis-era5-pressure-le...