Hi Martin, I see your point. The tendency definition certainly argues for negative values for sedimentation and a change of "Loss to sediments" to something like "Tendency with respect to sedimentation" for consistency.
Cheers, John On Wed, Sep 5, 2018 at 5:05 AM, Martin Juckes - UKRI STFC < [email protected]> wrote: > 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> > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >
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