Dear Martin,
Thank you for proposing these two C4MIP names. They both look good to me - I've added some definitions.
1. CMIP6 sort name nppStem. Net Primary Production Allocated to Stem
> For the related variables nppOther and nppLeaf respetively, we have
> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_miscellaneous_living_matter, and
> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_leaves.
>
> Adapting the latter for stems, I propose:
>
> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_stems (kg m-2 s-1)
' "Production of carbon" means the production of biomass expressed as the mass of carbon which it contains. Net primary production is the excess of gross primary production (rate of synthesis of biomass from inorganic precursors) by autotrophs ("producers"), for example, photosynthesis in plants or phytoplankton, over the rate at which the autotrophs themselves respire some of this biomass. "Productivity" means production per unit area. 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. The stem of a plant is the axis that bears buds and shoots with leaves and, at its basal end, roots. Its function is to carry water and nutrients. Examples include the stalk of a plant or the main trunk of a tree.'
I have constructed the definition from existing text. This is very similar to existing names. The name, units and definition are fine. This name is accepted for publication in the standard name table and will be added in the May update.
2. CMIP6 short name fNAnthDisturb. nitrogen mass flux out of land due to any human activity
> This is the nitrogen equivalent of fAnthDisturb which has standard name:
>
> tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_emission
>
> Following existing usage, this can be adapted as:
>
> tendency_of_atmosphere_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_anthropogenic_emission (kg m-2 s-1)
>
> Note, however, the discussion here: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060106.html, in which Jonathan has questioned
> this kind of use of "expressed_as".
I think we have now resolved the question about this use of expressed_as and have decided it is okay! (
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060156.html, proposal 3;
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060158.html). Hence I think your current proposal is fine:
tendency_of_atmosphere_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_anthropogenic_emission (kg m-2 s-1)
'The phrase "tendency_of_X" means derivative of X with respect to time. "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. 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. "Nitrogen compounds" summarizes all chemical species containing nitrogen atoms. The list of individual species that are included in this quantity can vary between models. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute. The specification of a physical process by the phrase "due_t
o_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Emission" means emission from a primary source located anywhere within the atmosphere, including at the lower boundary (i.e. the surface of the earth). "Emission" is a process entirely distinct from "re-emission" which is used in some standard names. "Anthropogenic" means influenced, caused, or created by human activity.'
I have constructed the definition from existing text. This name is accepted for publication in the standard name table and will be added in the May update.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: Juckes, Martin (STFC,RAL,RALSP)
Sent: 25 April 2018 11:26
To: CF Metadata List <cf-metadata at cgd.ucar.edu>
Cc: Pamment, Alison (STFC,RAL,RALSP) <alison.pamment at stfc.ac.uk>; Jones, Chris D <chris.d.jones at metoffice.gov.uk>
Subject: C4MIP: final two terms for CMIP6
Dear All,
following heroic efforts by Alison, Chris and others, there are only two terms remaining in the C4MIP request that need new standard names. Both are simple variations of names that have recently been approved.
1. nppStem Net Primary Production Allocated to Stem [kg m-2 s-1]
For the related variables nppOther and nppLeaf respetively, we have net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_miscellaneous_living_matter, and net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_leaves.
Adapting the latter for stems, I propose:
net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_stems
2. fNAnthDisturb nitrogen mass flux out of land due to any human activity [kg m-2 s-1]
This is the nitrogen equivalent of fAnthDisturb which has standard name:
tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_emission
Following existing usage, this can be adapted as:
tendency_of_atmosphere_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_anthropogenic_emission
Note, however, the discussion here:
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060106.html, in which Jonathan has questioned this kind of use of "expressed_as".
regards,
Martin
Received on Fri May 04 2018 - 08:19:43 BST
