Dear Mike and Ute,
There is a parameter 'total petroleum hydrocarbons' (TPH) defined as 'A mixture comprising all substances comprising totally of carbon and hydrogen that may be extracted from a sample using an organic solvent. These are presumed sourced from crude oil.'. This is used by the water quality monitoring community as a measurement to describe the extent of contamination of sea water, biota and sediment and by crude oil.
My question to Mike is whether this is what he means by 'petroleum' and if so, would that be acceptable to Ute in a Standard Name?
If so, I also mention that in my experience of these measurements contamination of water samples is reported in units of micrograms per litre, i.e. mass concentration rather than mass fraction. Biota and sediment TPHs are reported as mass fractions. Could Mike confirm that his data are indeed mass fractions and not mass concentrations?
Cheers, Roy.
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Ute Br?nner
Sent: 29 June 2016 08:37
To: 'cf-metadata at cgd.ucar.edu'
Cc: CJ Beegle-Krause; 'mikegodino at yahoo.com'; Tor Nordam; Petter R?nningen; J?rgen Skancke
Subject: Re: [CF-metadata] New standard name for mass_fraction_of_petroleum_in_sea_water
Hei from Norway,
I read this proposal with interest!
However I would like to recommend to not accept it because of the following reasons:
1. Spilled oil at sea undergoes immediate weathering processes like evaporation and emulsification together with biodegradation and dissolution. That means that the releases matter "petroleum" or "crude oil" will not be the same after very short time.
2. As mentioned in 1., a part of the oil will dissolve into the sea water and despite the fact that some models do not account for this, many others do. So one would need a standard name for the dissolved fraction, and one for the droplet part. If we consider live oil and mixed releases, we might want a standard name for the gas fraction as well (also dissolved and bubbles).
3. Oil on the sea surface will emulsify so we would need a name for the oil mass and for the emulsion mass here.
"mass_fraction_of_petroleum_in_sea_water" will not be able to describe oil properly for many models. I would like to propose to use a standard name like "mass_fraction_of_contaminant_in_sea_water" for the simple purpose of tracking released oil or chemicals without weathering and that we need to come up with a list of standard names for the more complex cases .
Chris, I guess we have to revive our discussion on standard names for oil spill models once more. :-). Mike, maybe you could elaborate a bit more in which context you want to use your proposed standard name?
A nice summer to all of you!
With kind regards,
Ute
Ute Br?nner
Research Scientist
SINTEF Materials & Chemistry
Environmental Technology, Monitoring and Modelling<
http://www.sintef.no/EnvironmentalMonitoringModelling>
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http://www.sintef.no/DREAM>, www.sintef.no/ELMO<
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From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of mikegodino at yahoo.com<mailto:mikegodino at yahoo.com>
Sent: 28 June 2016 18:42
To: cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Subject: [CF-metadata] New standard name for mass_fraction_of_petroleum_in_sea_water
Dear All,
I'd like to propose the following new standard name:
Name: mass_fraction_of_petroleum_in_sea_water
Units: 1
Description: Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. Petroleum is a mixture of different saturated hydrocarbons other organic chemicals. The name petroleum can refer to either crude oil or liquid products resulting from the refining of naturally occurring crude oil.
Alternately, the name could be: mass_fraction_of_crude_oil_in_sea_water
Thanks,
Mike
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