Hello John,
By '% oxygen concentration in seawater' do you mean what I would term oxygen saturation? In 35 years I have seen oxygen CONCENTRATION expressed in many units - ml/l, micrograms/litre, micromoles/litre and micromoles/kilogram - but never in per cent. I have, however, frequently encountered 'oxygen saturation' in per cent. Oxygen saturation is readily computable from oxygen concentration if temperature and salinity are known, so my guess is that the optode processing software is doing that to get a value in per cent.
If this is the case, then the correct Standard Name to use is fractional_saturation_of_oxygen_in_sea_water. Don't get hung up on the 'fractional' and Canonical Units - they just signify the dimension, not the scaling - you provide the scaling through the Units parameter attribute, which you set to 'percent'.
Cheers, Roy.
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of John Kerfoot
Sent: 06 April 2016 14:28
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] standard name for oxygen concentration in seawater as a percentage
I've searched the CF standard name table and can't seem to find a standard_name for the % oxygen concentration in seawater. I did find the following:
fractional_saturation_of_oxygen_in_sea_water
volume_fraction_of_oxygen_in_sea_water
but, unless I'm misunderstanding the definitions, I don't think either of these fit this parameter exactly. The instrument we're using is an optode that provides this value directly.
Can anyone shed some light on the proper standard name to use, if it exists? Or do I need to explicitly convert % to a fraction?
Thanks,
John
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