Standard names: add probability above threshold for volcanic ash concentration in air #303
Description
Hello,
To represent of a volcanic ash cloud, we are producing concentrations and probabilities of exceedance for various thresholds of concentrations.
I would like to propose the addition of a standard name the probabilities of exceedance of various thresholds for volcanic ash concentration:
Proposer's name: Mathieu Deslandes
Date: 3/3/2026
Term: probability_of_mass_concentration_of_volcanic_ash_in_air_above_threshold
Description :
"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.
Mass concentration means mass per unit volume is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y.
"probability_of_X_above_threshold" means the chance that X is above the threshold.
Space and time coordinates must be used to indicate the area and time to which a probability applies.
Units:
canonical units : 1
It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction.
The thresholds are specified in a coordinate variable, I was simply thinking that this variable should have a standard_name of "mass_concentration_of_volcanic_ash_in_air", but there is maybe some better choices.
Kind regards,
Mathieu