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
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Received on Wed Sep 05 2018 - 03:05:33 BST
