Dear Martin
Thanks for spotting this. I agree with your solution.
Best wishes
Jonathan
----- Forwarded message from Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk> -----
> Date: Wed, 5 Sep 2018 09:05:33 +0000
> From: Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk>
> To: "CF-metadata (cf-metadata at cgd.ucar.edu)" <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] Ocean content tendencies due to sedimentation -- sign
> ambiguity in CMIP usage
>
> Hello All,
>
>
> there is a problem with the way 4 CMIP6 variables use standard names defined for tendencies due to sedimentation. Sedimentation in CF means sedimentation in water, so sedimentation of a substance always leads to a negative tendency of the amount of that substance suspended in the ocean. In CMIP6, following CMIP5 usage, standard names for tendencies of amounts of substances in the ocean have been used for variables with long names which imply that they are negative tendencies, i.e. loss rates. E.g.
>
> - frfe "Iron Loss to Sediments" tendency_of_ocean_mole_content_of_iron_due_to_sedimentation.
>
>
> We recently dealt with a similar issue for atmospheric deposition rates: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/020204.html and the solution (http://cfeditor.ceda.ac.uk/proposal/3225 ) was to introduce new standard names of the form "minus_tendency_...".
>
>
> For the four ocean variables (frfe, frn, fric, froc) I propose 4 new standard names:
>
> minus_tendency_of_ocean_mole_content_of_inorganic_carbon_due_to_sedimentation
> minus_tendency_of_ocean_mole_content_of_organic_carbon_due_to_sedimentation
> minus_tendency_of_ocean_mole_content_of_iron_due_to_sedimentation (as in CMIP5)
> minus_tendency_of_ocean_mole_content_of_elemental_nitrogen_due_to_denitrification_and_sedimentation
>
>
> These all correspond to minus one times the quantity defined by existing standard names.
>
>
> More details about the 4 CMIP variables are given on the Data Request github site: https://github.com/cmip6dr/CMIP6_DataRequest_VariableDefinitions/issues/344
>
>
> regards,
>
> Martin
>
> <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/020204.html>
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----- End forwarded message -----
Received on Wed Sep 05 2018 - 05:50:57 BST
