Dear Jonathan,
It is a logical extension, I believe, in the existing usage in terms such as "gross_primary_productivity_of_biomass_expressed_as_carbon", for which the help text states: "The phrase "expressed_as" is used in the construction A_expressed_as_B, where B is a chemical constituent of A. It means that the quantity indicated by the standard name is calculated solely with respect to the B contained in A, neglecting all other chemical constituents of A", i.e. the new terms are meant to refer to the mass of 13C/14C which is contained in the biomass.
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: 24 April 2018 13:35
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] PMIP (including 1 or more that originated in C4MIP) Standard Names: Carbon and Nitrogen terms
Dear Martin
Thanks for the new proposals.
> gross_primary_productivity_of_biomass_expressed_as_13C
> gross_primary_productivity_of_biomass_expressed_as_14C
These don't seem quite right to me. They imply you can express the *entire* GPP
as kg of 13C or 14C. Does it means the mass of 13C or 14C in the GPP?
Best wishes
Jonathan
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Received on Tue Apr 24 2018 - 07:47:29 BST
