Dear All,
Having read through the SeaOWL specification provided by Mike's link, I see it is something totally new making a combination of fluorescence and backscatter measurements at different wavelengths and using the results in a calibration algorithm to produce measurements of an analyte that WETLabs/SeaBird describe as 'crude oil'. This is NOT the same thing as TPH (a wet chemical measurement), although in most environments the two will be linearly correlated. I therefore now think that it would be best to use the terminology of the instrument manufacturer: i.e. 'crude_oil'.
The mass fraction/mass concentration issue is an interesting one. This difference has received much attention in the oceanographic research community with very precise conversions between mass concentrations to mass fractions depending upon variations in temperature, pressure and salinity. However, I strongly suspect that the 'ppb' units of the new instrument have an assumption of pure water density somewhere in the calibration algorithm and take no account of salt water density variations. In other words 'ppb' means BOTH unit mass per unit mass and unit mass per unit volume.
Having given this some thought, I think Mike's original mass fraction is probably the better choice as without further information we can only assume that 'ppb' is dimensionless. So, this gives us:
mass_fraction_of_crude_oil_in_sea_water
Is this agreeable to all? If so, all we need is some work on the definition to add what is meant by 'crude_oil' to what Mike has already provided which just defines 'mass fraction'.
Cheers, Roy.
Please note that I partially retired on 01/11/2015. I am now only working 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my day in the office. All vocabulary queries should be sent to enquiries at bodc.ac.uk. Please also use this e-mail if your requirement is urgent.
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Jonathan Gregory <j.m.gregory at reading.ac.uk>
Sent: 30 June 2016 17:06
To: cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] New standard name for mass_fraction_of_petroleum_in_sea_water
Dear Mike
I agree that petroleum_hydrocarbons is more specific and therefore preferable.
Is it possible to omit "total", or does it have a specific meaning too and
therefore convey some extra information? It would be good to be explicit if
that is the case.
Best wishes
Jonathan
----- Forwarded message from mikegodino at yahoo.com -----
> Date: Thu, 30 Jun 2016 15:57:35 +0000
> From: mikegodino at yahoo.com
> To: "Lowry, Roy K." <rkl at bodc.ac.uk>, Ute Br?nner <Ute.Broenner at sintef.no>,
> "'cf-metadata at cgd.ucar.edu'" <cf-metadata at cgd.ucar.edu>
> CC: Petter R?nningen <Petter.Ronningen at sintef.no>, J?rgen Skancke
> <Jorgen.Skancke at sintef.no>, Tor Nordam <Tor.Nordam at sintef.no>, CJ
> Beegle-Krause <CJ.Beegle-Krause at sintef.no>
> Subject: Re: [CF-metadata] New standard name for
> mass_fraction_of_petroleum_in_sea_water
>
> 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.
[
http://wetlabs.com/sites/default/files/styles/medium/public/product_images/seawolf_web.jpg?itok=_23M0RAq]<
http://wetlabs.com/SeaOWL>
SeaOWL UV-A(tm) (Sea Oil-in-Water(tm) Locator) | WET Labs<
http://wetlabs.com/SeaOWL>
wetlabs.com
Sea-Bird Scientific introduces SeaOWL UV-ATM, a new in-situ oil-in-water sensor. Based-upon the highly successful WET Labs ECO sensor, Sea-Bird Scientific has ...
> Thank you,Mike Godin
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