## How to calculate total mass accumulated in a column?

Post questions, comments and links to research (research papers, web sites, etc) involving HYSPLIT and volcanic ash. This section is also to facilitate collaborations between researchers involved in volcanic ash transport and dispersion.
tschonholz
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Joined: May 8th, 2013, 11:42 am
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Location: Argentina
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### How to calculate total mass accumulated in a column?

I was wondering how to calculate accumulated mass in a column (in tn/ km^2 maybe) for a volcanic ash run.
I was using concentration but it's not representative of the case.

Thanks for any advice.
Tamara Schonholz
barbara.stunder
Posts: 451
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

### Re: How to calculate total mass accumulated in a column?

To get the mass in a column, multiply the concentration by the depth of the column over which the concentration is calculated.

Amount of mass in the eruption, height of the eruption, and how quickly the particles fall out can all affect the results.
tschonholz
Posts: 29
Joined: May 8th, 2013, 11:42 am
Registered HYSPLIT User: Yes
Location: Argentina
Contact:

### Re: How to calculate total mass accumulated in a column?

But there is no way to actually get it done by GUI, right?
I want to compare the outcome of HYSPLIT with other dispersion models, and they seem to show results in mass accumulated in a colum.
May it be possible?

Thanks a lot! I´m learning so much!
Tamara Schonholz
barbara.stunder
Posts: 451
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

### Re: How to calculate total mass accumulated in a column?

We plan to add output as mass loading for volcanic ash, but that is not available yet.

Through the web, it is not possible to multiply the output by a constant. Through the PC GUI, on the "Concentration Display" window there is an entry "Concentration multiplier" where this can be done.
tschonholz
Posts: 29
Joined: May 8th, 2013, 11:42 am
Registered HYSPLIT User: Yes
Location: Argentina
Contact:

### Re: How to calculate total mass accumulated in a column?

Do we have any advance in this or still planning?
Thanks!!
Tamara Schonholz
barbara.stunder
Posts: 451
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

### Re: How to calculate total mass accumulated in a column?

Yes, for volcanic ash simulations, mass loading is output under the "(NEW) Compute archive volcanic ash concentrations" at http://www.ready.noaa.gov/HYSPLIT_ash.php