Dear Jonathan

> This is a good suggestion.  I've updated the definition to define
> volcanic ash.
> 
> Standard Name:   atmosphere_mass_content_of_volcanic_ash
> 
> Definition:"Content" indicates a quantity per unit area. The
> "atmosphere content" of a quantity refers to the vertical integral
> from the surface to the top of the atmosphere. For the content
> between specified levels in the atmosphere, standard names including
> content_of_atmosphere_layer are used." "Volcanic_ash" means the
> fine-grained products of explosive volcanic eruptions, such as
> minerals or crystals, older fragmented rock (e.g. andesite), and
> glass.Particles within a volcanic ash cloud have diameters less than
> 2 mm."Volcanic_ash" does not include non-volcanic dust.

That looks good. Thanks!

Cheers

Jonathan
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