Dear Ute and Roy,
Thank you for your careful consideration and deliberation on my proposal. ?I would be satisfied by replacing "petroleum" in my original suggestion with either Ute's suggestion of "contaminant" or Roy's suggestion of "total_petroleum_hydrocarbons", although I find the latter a little more specific, particularly if one were to envision a situation in which intentionally released dispersants were being tracked at the same time and also categorized as "contaminants".
As to the question of mass concentration vs. mass fraction, I am trying to represent the measurements of the?SeaOWL UV-A sensor (
http://wetlabs.com/SeaOWL), which appears to be calibrated in units of ppm -- and hence mass fraction seems appropriate. ?The model that will assimilate these measurements is under active development, and may likely generate a mass concentration value. ?So perhaps there ought to be both?mass concentration AND mass fraction?standard names.
Thank you,Mike Godin
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