Standard names: *CMIP7: Isotope_ratio_of_2H_to_1H_in_sea_water_excluding_solutes_and_solids*

[christian-stepanek]

Christian Stepanek

20th November, 2024

We need a new CF standard name for 2H and 1H in sea water excluding solutes and solids. This is necessary as the respective proposed CMIP7 variable does not yet have the corresponding CF standard name.

**- proposed name: ** Isotope_ratio_of_2H_to_1H_in_sea_water_excluding_solutes_and_solids

**- description: **similarly to isotope_ratio_of_17O_to_16O_in_sea_water_excluding_solutes_and_solids

**- units: ** 1

[github-actions]

Thank you for your proposal. These terms will be added to the cfeditor (http://cfeditor.ceda.ac.uk/proposals/1) shortly. Your proposal will then be reviewed and commented on by the community and Standard Names moderator.

[JonathanGregory]

This proposal is consistent with existing names. In addition to what @christian-stepanek said, I note that 2H is already used in standard names.

[feggleton]

Using common phrases, the description would be:

The phrase "ratio_of_X_to_Y" means X/Y. The phrase "isotope_ratio" is used in the construction isotope_ratio_of_A_to_B where A and B are both named isotopes. It means the ratio of the number of atoms of A to the number of atoms of B present within a medium. "H" means the element "hydrogen" and "2H" is the stable isotope "hydrogen-2", usually called "deuterium". "1H" is the stable isotope "hydrogen-1". The phrase "in_sea_water_excluding_solutes_and_solids" means that the standard name refers only to the chemical compound water and does not include material that may be dissolved or suspended in the aqueous medium.

This has been added to the editor.