Dear Jonathan,
Thanks. I agree that "water" is redundant in these names (except where it occurs as "water_vapor"), so we can use, for example, precipitation_flux_containing_O17.
For the solid phase precipitation, I would prefer "solid_precipitation_flux_containing_O17", rather than "frozen_precipitation_flux_containing_O17" ... but perhaps we can complete that discussion in the other thread (
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060000.html )
regards,
Martin
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Jonathan Gregory <j.m.gregory at reading.ac.uk>
Sent: 05 April 2018 18:41
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] PMIP Standard names: isotopic fluxes, mass contents and ratios.
Dear Martin
Thanks for these proposals. I think your new constructions A_containing_B and
isotope_ratio_of_A_to_B are good ideas, which you need for these quantities.
My previous posting about "frozen" and precipitation always being water apply
to some of these as well.
Best wishes
Jonathan
----- Forwarded message from Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk> -----
> Date: Tue, 3 Apr 2018 10:53:09 +0000
> From: Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> CC: Jean-Yves Peterschmitt <Jean-Yves.Peterschmitt at lsce.ipsl.fr>, Didier
> Roche <Didier.Roche at lsce.ipsl.fr>
> Subject: [CF-metadata] PMIP Standard names: isotopic fluxes, mass contents
> and ratios.
>
> Dear All,
>
> I would like to propose the following 12 standard names on behalf of the PMIP team. They all relate to water molecules containing stable isotopes of oxygen or hydrogen (17O, 18O, and 2H [deuterium]).
>
> (1) pr18O: Precipitation mass flux of water molecules that contain the oxygen-18 isotope (H2 18O), including solid and liquid phases. [kg m-2 s-1]
>
> There is no current CF construction to refer to water containing a specific isotope; the closest is ".._A_expressed_as_B", which refers to the amount of a component B in A. We propose a new construction "_A_containing_B" which refers to the amount of A which contains B:
>
> precipitation_flux_of_water_containing_18O
>
> (2) prsn18O: Precipitation mass flux of water molecules that contain the oxygen-18 isotope (H2 18O), including solid phase only. [kg m-2 s-1]
>
> As (1), but for solid phase only. There does not appear to be a specific standard name construction for the solid phase of water, but "_liquid_phase" is used for the liquid phase, so "solid_phase" appears to be a natural extension.
>
> precipitation_flux_of_solid_water_containing_18O
>
> (3) pr2h: Precipitation mass flux of water molecules that contain one atom of the hydrogen-2 isotope (1H 2H O), including solid and liquid phases. [kg m-2 s-1]
>
> As (1), but for 2H
> precipitation_flux_of_water_containing_2H
>
> (4) prsn2h: Precipitation mass flux of water molecules that contain one atom of the hydrogen-2 isotope (1H 2H O), including solid phase only. [kg m-2 s-1]
>
> As (2), but for 2H
> precipitation_flux_of_solid_water_containing_2H
>
> (5) pr17O: Precipitation mass flux of water molecules that contain the oxygen-17 isotope (H2 17O), including solid and liquid phases. [kg m-2 s-1]
>
> As (1), but for 17O
> precipitation_flux_of_water_containing_17O
>
> (6) prsn17O: Precipitation mass flux of water molecules that contain the oxygen-17 isotope (H2 17O), including solid phase only. [kg m-2 s-1]
>
> As (2), but for 17O
> precipitation_flux_of_solid_water_containing_17O
>
> (7) prw18O: Water vapor path for water molecules that contain oxygen-18 (H2 18O) [kg m-2]
>
> This proposal follows the pattern of mass_content_of_water_vapor_in_atmosphere_layer, with the "containing_18O" specialisation:
>
> mass_content_of_water_vapor_containing_18O_in_atmosphere_layer
>
> (8) prw17O: Water vapor path for water molecules that contain oxygen-17 (H2 17O) [kg m-2]
>
> As (7), but for 17O
> mass_content_of_water_vapor_containing_17O_in_atmosphere_layer
>
> (9) prw2H: Water vapor path for water molecules that contain one atom of the hydrogen-2 isotope (1H 2H O) [kg m-2]
>
> As (7), but for 2H
> mass_content_of_water_vapor_containing_2H_in_atmosphere_layer
>
> (10) sw18O: Ratio of abundance of oxygen-18 (18O) atoms to oxgen-16 (16O) atoms in sea water [1]
>
> "Isotope ratio" is a widely used concept which is not yet represented in the standard name list. Isotope ratios are the ratio of one isotope to another, usually the most stable isotope (e.g. 16O for oxygen). In the standard names we propose a cautious approach of explicitly stating both isotopes in the ratio:
>
> isotope_ratio_of_18O_to_16O_in_sea_water
>
> The construction "isotope_ratio_A_to_B_" refers to the ratio of the number of atoms of A to the number of atoms of B.
>
> (11) sw17O: Ratio of abundance of oxygen-17 (17O) atoms to oxgen-16 (16O) atoms in sea water [1]
>
> As (10), but for 17O
> isotope_ratio_of_17O_to_16O_in_sea_water
>
> (12) sw2H: Ratio of abundance of hydrogen-2 (2H) atoms to hydrogen-1 (1H) atoms in sea water [1]
>
> As (10), but for 2H
> isotope_ratio_of_2H_to_1H_in_sea_water
>
> regards,
> Martin
>
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