Hi Alison,

thanks so much for starting this thread going to approve these new names. I've 
suggested a few edits/changes below and await comments from others.

For info for those on this list who haven't seen the C4MIP GMD paper, we tried 
to explicitly show all these diagnostics in our figures which we found a good 
way to help explain them, the sign convention, which are stores/fluxes, how 
they relate to each other etc. So that reference may help interpret this 
discussion too. See especially figures 5-8 of:
https://www.geosci-model-dev.net/9/2853/2016/ 

Many thanks,
Chris

Numbers below refer to Alison's email:

4, 5 - veg and litter fires. These are not really from "vegetation fires" and 
"litter fires" (this description makes it sounds like these are separate 
fires), but rather when there is a fire, some of the carbon burnt comes from 
the vegetation and some from the litter. So these are a way to split those 
(i.e. they sum to the total fCfire). So maybe phrase as 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_vegetation_carbon_due_to_fire
 ?

should we specify somewhere that fCVegFire + fCLitterFire = fCfire?

10 - probably true that most models have the runoff going into rivers, but 
maybe not all - some might go straight into the ocean, and some might simply 
lose the water/carbon from the system without closing the budget. So perhaps 
instead of "into_rivers" how about "out_of_soil". From a diagnostic point of 
view this diagnostic is there to represent a loss term from soil, rather than 
input to rivers, so it makes sense that way too.

11 - which LUMIP variable do you think this tallies with? I think, yes I agree, 
that fCAnthDisturb (C4MIP) = fLulccAtmLut (LUMIP). So OK to use the same name. 
Do we need to specify that this is "into the atmosphere" or does "upwards" 
explicitly mean that?

12 - yes, OK. Out of interest, why is this one a "tendency of atmosphere" and 
not a "flux" - is there a subtle difference?

13, 14 - no, these are not quite what we want. Both of these represent a flux 
from the vegetation/litter/soil into the product pools, but from different 
processes. So fDeforestToProduct should be around land_use_CHANGE or 
land_cover_CHANGE, whereas fCHarvestToProduct is not an upwards flux to the 
atmosphere, but a flux into the product pools due to harvest (either crop or 
wood harvest) (for example commercial logging to make furniture would go here).

15-22: isotope ones - all good

23-25 - nitrogen ones - not quite right wording. The aim here is to capture 
nitrogen compounds stored as inorganic compounds in the soil. This tends to be 
as ammonium ions or nitrate ions. This pool (nMineral) is the sum of both and 
complements the organic nitrogen pool nSoil. The sub-components then separately 
capture the reduced and oxidised forms. We suggest:

23. (CMIP6 short name nMineral)
soil_mass_content_of_mineral_nitrogen_expressed_as_nitrogen (canonical units: 
kg m-2) ' "Content" indicates a quantity per unit area. The "soil content" of a 
quantity refers to the vertical integral from the surface down to the bottom of 
the soil model. The term "mineral" refers to the total nitrogen occurring in 
any inorganic chemical species. 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.' soil_mass_content_of_mineral_nitrogen_expressed_as_nitrogen should be equal 
to the sum of soil_mass_content_of_mineral_ammonium_expressed_as_nitrogen and 
soil_mass_content_of_mineral_nitrate_expressed_as_nitrogen. 
The counterpart to nMineral is the organic nitrogen pool nSoil.

24. (CMIP6 short name nMineralNH4)
soil_mass_content_of_mineral_ammonium_expressed_as_nitrogen (canonical units: 
kg m-2) ' "Content" indicates a quantity per unit area. The "soil content" of a 
quantity refers to the vertical integral from the surface down to the bottom of 
the soil model. The term "mineral_ammonium" refers to the total nitrogen 
occurring in reduced form as ammonium species. 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.'

25. (CMIP6 short name nMineralNO3)
soil_mass_content_of_mineral_nitrate_expressed_as_nitrogen (canonical units: kg 
m-2) ' "Content" indicates a quantity per unit area. The "soil content" of a 
quantity refers to the vertical integral from the surface down to the bottom of 
the soil model. The term "mineral_nitrate" refers to the total nitrogen 
occurring in oxidised form as nitrate species. 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.'


26 and 27 - all wetland methane ones - chemists prefer mass of species, so the 
units of these ones should be "expressed as CH4" rather than "expressed as 
carbon".

27 - wetlandCH4cons - please can this specify explicitly it is a flux out of 
the atmosphere (and/or "downward") because it represents a loss term. i.e. a 
positive value of wetlandCH4cons implies the amount of methane in the 
atmosphere is decreasing


-- 
Dr Chris Jones 
Head, Earth System and Mitigation Science Team 
Met Office Hadley Centre, FitzRoy Road, Exeter, EX1 3PB, U.K. 
Tel: +44 (0)1392 884514  Fax: +44 (0)1392 885681 
E-mail: chris.d.jo...@metoffice.gov.uk  http://www.metoffice.gov.uk 


-----Original Message-----
From: alison.pamm...@stfc.ac.uk [mailto:alison.pamm...@stfc.ac.uk] 
Sent: 23 February 2018 11:44
To: Jones, Chris D <chris.d.jo...@metoffice.gov.uk>; cf-metadata@cgd.ucar.edu
Subject: New standard names for C4MIP

Dear Chris, All,

I am proposing these standard names on behalf of Chris Jones. They are needed 
for the CMIP6 C4MIP experiment.

I am sure that Chris will comment on the names and definitions in due course 
and other comments and suggestions for improvement are always welcome.
 
Chris, you will see that some of the names have evolved again from the versions 
in our offlist discussion. This is partly due to the fact that I understand the 
quantities better now - thank you for providing information for the definitions 
- and partly because I have modified some of them to be more consistent with 
existing names. Please have a look through the proposals and let me know if you 
are happy with them.

1. (CMIP6 short name fCLandToOcean)
mass_flux_of_carbon_into_sea_water_from_rivers (canonical units: kg m-2 s-1) 
'In accordance with common usage in geophysical disciplines, "flux" implies per 
unit area, called "flux density" in physics.'

2. (CMIP6 short name fCFireNat)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_natural_fires
 (canonical units: kg m-2 s-1) ' "Upward" indicates a vector component which is 
positive when directed upward (negative downward). In accordance with common 
usage in geophysical disciplines, "flux" implies per unit area, called "flux 
density" in physics. 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 
chemical formula for carbon dioxide is CO2. The specification of a physical 
process by the phrase "due_to_" 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. "Natural fires" means 
burning of biomass, whether living or dead, excluding fires ignited by humans, 
e.g. for agricultural purposes. The quantity with standard name 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_natural_fires
 is the sum of the quantities with standard names 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_vegetation_fires
 and 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_litter_fires.'

3. (CMIP6 short name fCFire)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_fires
 (canonical units: kg m-2 s-1) ' "Upward" indicates a vector component which is 
positive when directed upward (negative downward). In accordance with common 
usage in geophysical disciplines, "flux" implies per unit area, called "flux 
density" in physics. 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 
chemical formula for carbon dioxide is CO2. The specification of a physical 
process by the phrase "due_to_" 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. The term "fires" means all 
biomass fires, whether naturally occurring or ignited by humans.'

4. (CMIP6 short name fCVegFire)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_vegetation_fires
 (canonical units: kg m-2 s-1) ' "Upward" indicates a vector component which is 
positive when directed upward (negative downward). In accordance with common 
usage in geophysical disciplines, "flux" implies per unit area, called "flux 
density" in physics. 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 
chemical formula for carbon dioxide is CO2. The specification of a physical 
process by the phrase "due_to_" 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" is a process entirely distinct from 
"re-emission" which is used in some standard names. "Vegetation" means any 
living plants e.g. trees, shrubs, grass. The quantity with standard name 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_natural_fires
 is the sum of the quantities with standard names 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_vegetation_fires
 and 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_litter_fires.'

5. (CMIP6 short name fCLitterFire)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_litter_fires
 (canonical units: kg m-2 s-1) ' "Upward" indicates a vector component which is 
positive when directed upward (negative downward). In accordance with common 
usage in geophysical disciplines, "flux" implies per unit area, called "flux 
density" in physics. 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 
chemical formula for carbon dioxide is CO2. The specification of a physical 
process by the phrase "due_to_" 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" is a process entirely distinct from 
"re-emission" which is used in some standard names. "Litter" is dead plant 
material in or above the soil. The quantity with standard name 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_natural_fires
 is the sum of the quantities with standard names 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_vegetation_fires
 and 
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_litter_fires.'

6. (CMIP6 short name fCVegLitterSenescence) 
mass_flux_of_carbon_into_litter_from_vegetation_due_to_senescence (canonical 
units: kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. "Vegetation" 
means any living plants e.g. trees, shrubs, grass. "Litter" is dead plant 
material in or above the soil. The specification of a physical process by the 
phrase "due_to_" 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. The term "senescence" means loss of living biomass excluding plant 
death, e.g. leaf drop and other seasonal effects. The term refers to changes in 
the whole plant and is not confined only to leaf drop.'

7. (CMIP6 short name fCVegLitterMortality) 
mass_flux_of_carbon_into_litter_from_vegetation_due_to_mortality (canonical 
units: kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. "Vegetation" 
means any living plants e.g. trees, shrubs, grass. "Litter" is dead plant 
material in or above the soil. The specification of a physical process by the 
phrase "due_to_" 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. The term "mortality" means the loss of living biomass due to plant 
death. It refers to the death of the whole plant, not only the leaves.'

8. (CMIP6 short name fCVegSoilSenescence) 
mass_flux_of_carbon_into_soil_from_vegetation_due_to_senescence (canonical 
units: kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. "Vegetation" 
means any living plants e.g. trees, shrubs, grass. The specification of a 
physical process by the phrase "due_to_" 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. The term "senescence" means loss of living 
biomass excluding plant death, e.g. leaf drop and other seasonal effects. The 
term refers to changes in the whole plant and is not confined only to leaf 
drop.'

9. (CMIP6 short name fCVegSoilMortality) 
mass_flux_of_carbon_into_soil_from_vegetation_due_to_mortality (canonical 
units: kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. "Vegetation" 
means any living plants e.g. trees, shrubs, grass. The specification of a 
physical process by the phrase "due_to_" 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. The term "mortality" means the loss of living 
biomass due to plant death. It refers to the death of the whole plant, not only 
the leaves.'

10. (CMIP6 short name fCleach)
mass_flux_of_carbon_into_rivers_from_soil_due_to_leaching_and_runoff (canonical 
units: kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. The 
specification of a physical process by the phrase "due_to_" 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. "Leaching" means the loss of 
water soluble chemical species from soil. Runoff is the liquid water which 
drains from land. If not specified, "runoff" refers to the sum of surface 
runoff and subsurface drainage.'

I have described this as a mass flux into rivers as I assume that is where the 
runoff will eventually go. Is that okay?

11. (CMIP6 short name fCAnthDisturb)

I see now that this quantity and those in 12 - 14 below look like ones I have 
already added to the standard name table for the CMIP6 LUMIP experiment. Please 
check that they meet your needs, and assuming they do, please use the existing 
names.

Existing name:
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change
 (kg m-2 s-1) 'The surface called "surface" means the lower boundary of the 
atmosphere. "Upward" indicates a vector component which is positive when 
directed upward (negative downward). In accordance with common usage in 
geophysical disciplines, "flux" implies per unit area, called "flux density" in 
physics. 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 
chemical formula for carbon dioxide is CO2. The specification of a physical 
process by the phrase "due_to_" 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. "Anthropogenic" means influenced, caused, or created by 
human activity. "Anthropogenic land use change" means human changes to land, 
excluding forest regrowth. It includes fires ignited by humans for the purpose 
of land use change and the processes of eventual disposal and decomposition of 
wood products such as paper, cardboard, furniture and timber for construction.'

Okay?

12. (CMIP6 short name fCProductDecomp)
 Existing name:
tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_forestry_and_agricultural_products
 (kg m-2 s-1) ' "tendency_of_X" means derivative of X with respect to time. 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 chemical formula for 
carbon dioxide is CO2. "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 specification of a physical process by the phrase "due_to_" 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. Examples of "forestry and agricultural products" are paper, cardboard, 
furniture, timber for construction, biofuels and food for both humans and 
livestock. Models that simulate land use changes have one or more pools of 
carbon that represent these products in order to conserve carbon and allow its 
eventual release into the atmosphere, for example, when the products decompose 
in landfill sites.'

Okay?

13. (CMIP6 short name fDeforestToProduct) Existing name:
carbon_mass_flux_into_forestry_and_agricultural_products_due_to_anthropogenic_land_use_or_land_cover_change
 (kg m-2 s-1) 'In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. The 
specification of a physical process by the phrase "due_to_" 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. "Anthropogenic" means 
influenced, caused, or created by human activity. Examples of "forestry and 
agricultural products" are paper, cardboard, furniture, timber for 
construction, biofuels and food for both humans and livestock. Models that 
simulate land use changes have one or more pools of carbon that represent these 
products in order to conserve carbon and allow its eventual release into the 
atmosphere, for example, when the products decompose in landfill sites. 
"Anthropogenic land use change" means human changes to land, excluding forest 
regrowth. It includes fires ignited by humans for the purpose of land use 
change and the processes of eventual disposal and decomposition of wood 
products such as paper, cardboard, furniture and timber for construction.'
N.B. Alias this to mass_flux_of_carbon... for more consistent syntax 
(introducing alias won't be a problem for LUMIP)

Okay?

14. (CMIP6 short name fCHarvestToProduct)  Existing name:
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_emission_from_crop_harvesting
 (kg m-2 s-1) ' "Upward" indicates a vector component which is positive when 
directed upward (negative downward). 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. In accordance with common usage in geophysical disciplines, "flux" implies 
per unit area, called "flux density" in physics. The surface called "surface" 
means the lower boundary of the atmosphere. The specification of a physical 
process by the phrase due_to_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. earth's 
surface). "Emission" is a process entirely distinct from "re-emission" which is 
used in some standard names. The chemical formula for carbon dioxide is CO2.'

Okay?

15. (CMIP6 short name c14Veg)
vegetation_mass_content_of_14C  (canonical units: kg m-2) ' "Content" indicates 
a quantity per unit area. "Vegetation" means any living plants e.g. trees, 
shrubs, grass. "C" means the element carbon and "14C" is the radioactive 
isotope "carbon-14", having six protons and eight neutrons and used in 
radiocarbon dating.'

I have changed from writing the isotope name as carbon14 to 14C to be 
consistent with the large number of  radioactive isotope names that were added 
to the standard name table last week. In the discussion of those names we 
agreed to use the chemical symbol for the element and have mixed case standard 
names whenever we want to describe a particular isotope. The CMIP names should 
now follow this agreed syntax. This applies to all the 14C and 13C names in 
proposals 15 - 22.

16. (CMIP6 short name c14Litter)
litter_mass_content_of_14C (canonical units: kg m-2) '"Content" indicates a 
quantity per unit area. "Litter" is dead plant material in or above the soil. 
"C" means the element carbon and "14C" is the radioactive isotope "carbon-14", 
having six protons and eight neutrons and used in radiocarbon dating.'

17. (CMIP6 short name c14Soil)
soil_mass_content_of_14C (canonical units: kg m-2) ' "Content" indicates a 
quantity per unit area. The "soil content" of a quantity refers to the vertical 
integral from the surface down to the bottom of the soil model. For the content 
between specified levels in the soil, standard names including 
"content_of_soil_layer" are used. "C" means the element carbon and "14C" is the 
radioactive isotope "carbon-14", having six protons and eight neutrons and used 
in radiocarbon dating.'

18. (CMIP6 short name c14Land)
mass_content_of_14C_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products
 (canonical units: kg m-2) ' "Content" indicates a quantity per unit area. 
"Vegetation" means any living plants e.g. trees, shrubs, grass. "Litter" is 
dead plant material in or above the soil. The "soil content" of a quantity 
refers to the vertical integral from the surface down to the bottom of the soil 
model. Examples of "forestry and agricultural products" are paper, cardboard, 
furniture, timber for construction, biofuels and food for both humans and 
livestock. Models that simulate land use changes have one or more pools of 
carbon that represent these products in order to conserve carbon and allow its 
eventual release into the atmosphere, for example, when the products decompose 
in landfill sites. "C" means the element carbon and "14C" is the radioactive 
isotope "carbon-14", having six protons and eight neutrons and used in 
radiocarbon dating.'

I realise this name doesn't look very elegant but there is a reason for writing 
it in this way! Firstly, this quantity is defined as the sum of all the other 
'land' components of 14C, i.e., vegetation + litter + soil + products, and that 
is explicitly stated in my suggested name. I hesitate to just call it 
mass_content_of_14C_on_land because we tend to use 'land' in CF as an area type 
meaning not sea or sea-ice. Also, the way the quantity is defined doesn't 
include, for example, carbon in bedrock so I think calling it 'land' is a bit 
too vague and general. We do have a precedent for combining multiple phrases 
with more than one _and_ in a standard name: 
tendency_of_ocean_mole_content_of_elemental_nitrogen_due_to_deposition_and_fixation_and_runoff.
 Again this is an example of where there didn't seem to be an appropriate 
succinct term. I'm very open to discussion on this proposal - can anyone think 
of a better  term than 'land' to summarize the sum of the various components?

19. (CMIP6 short name c13Veg)
vegetation_mass_content_of_13C (canonical units: kg m-2) ' "Content" indicates 
a quantity per unit area. "Vegetation" means any living plants e.g. trees, 
shrubs, grass. "C" means the element carbon and "13C" is the stable isotope 
"carbon-13", having six protons and seven neutrons.'

20. (CMIP6 short name c13Litter)
litter_mass_content_of_13C (canonical units: kg m-2) ' "Content" indicates a 
quantity per unit area. "Litter" is dead plant material in or above the soil. 
"C" means the element carbon and "13C" is the stable isotope "carbon-13", 
having six protons and seven neutrons.'

21. (CMIP6 short name c13Soil)
soil_mass_content_of_13C (canonical units: kg m-2) ' "Content" indicates a 
quantity per unit area. The "soil content" of a quantity refers to the vertical 
integral from the surface down to the bottom of the soil model. For the content 
between specified levels in the soil, standard names including 
"content_of_soil_layer" are used. "C" means the element carbon and "13C" is the 
stable isotope "carbon-13", having six protons and seven neutrons.'

22. (CMIP6 short name c13Land)
mass_content_of_13C_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products
 (canonical units: kg m-2) ' "Content" indicates a quantity per unit area. 
"Vegetation" means any living plants e.g. trees, shrubs, grass. "Litter" is 
dead plant material in or above the soil. The "soil content" of a quantity 
refers to the vertical integral from the surface down to the bottom of the soil 
model. Examples of "forestry and agricultural products" are paper, cardboard, 
furniture, timber for construction, biofuels and food for both humans and 
livestock. Models that simulate land use changes have one or more pools of 
carbon that represent these products in order to conserve carbon and allow its 
eventual release into the atmosphere, for example, when the products decompose 
in landfill sites. "C" means the element carbon and "13C" is the stable isotope 
"carbon-13", having six protons and seven neutrons.'

Similar to proposal 18, this quantity is the sum of the various land based 
carbon budget components for 13C. Again, if we can come up with a more succinct 
term for the sum of the components we could use it in this name.

23. (CMIP6 short name nMineral)
soil_mass_content_of_minerals_expressed_as_nitrogen (canonical units: kg m-2) ' 
"Content" indicates a quantity per unit area. The "soil content" of a quantity 
refers to the vertical integral from the surface down to the bottom of the soil 
model. For the content between specified levels in the soil, standard names 
including "content_of_soil_layer" are used. The term "mineral" means a solid, 
naturally occurring inorganic chemical species. 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.'

24. (CMIP6 short name nMineralNH4)
soil_mass_content_of_ammonium_minerals_expressed_as_nitrogen (canonical units: 
kg m-2) ' "Content" indicates a quantity per unit area. The "soil content" of a 
quantity refers to the vertical integral from the surface down to the bottom of 
the soil model. For the content between specified levels in the soil, standard 
names including "content_of_soil_layer" are used. The term "mineral" means a 
solid, naturally occurring inorganic chemical species. "Ammonium minerals" 
means mineral compounds containing ammonium. The chemical formula for the 
ammonium cation is NH4+. 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.'

25. (CMIP6 short name nMineralNO3)
soil_mass_content_of_nitrate_minerals_expressed_as_nitrogen (canonical units: 
kg m-2) ' "Content" indicates a quantity per unit area. The "soil content" of a 
quantity refers to the vertical integral from the surface down to the bottom of 
the soil model. For the content between specified levels in the soil, standard 
names including "content_of_soil_layer" are used. The term "mineral" means a 
solid, naturally occurring inorganic chemical species. "Nitrate minerals" means 
mineral compounds containing nitrate. The chemical formula for the nitrate 
anion is NO3-. 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.'

26. (CMIP6 short name wetlandCH4prod)
tendency_of_atmosphere_mass_content_of_methane_due_to_emission_from_wetland_biological_production
 (canonical units: kg m-2 s-1) ' "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 chemical formula for methane is CH4. The mass is the total mass of 
the molecules. The phrase "tendency_of_X" means derivative of X with respect to 
time. The specification of a physical process by the phrase "due_to_" 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. Wetlands are areas where water covers the soil, or is present either at 
or near the surface of the soil all year or for varying periods of time during 
the year, including during the growing season. The precise conditions under 
which wetlands produce and consume methane can vary between models.'

I got the definition of 'wetland' from 
https://www.epa.gov/wetlands/what-wetland - I wanted to find something that 
wasn't too tied in to CMIP6 definitions. Okay?

27. (CMIP6 short name wetlandCH4cons)
tendency_of_atmosphere_mass_content_of_methane_due_to_wetland_biological_consumption
 (canonical units: kg m-2 s-1) ' "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 chemical formula for methane is CH4. The mass is the total mass of 
the molecules. The specification of a physical process by the phrase "due_to_" 
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. Wetlands 
are areas where water covers the soil, or is present either at or near the 
surface of the soil all year or for varying periods of time during the year, 
including during the growing season. The precise conditions under which 
wetlands produce and consume methane can vary between models.'

28. (CMIP6 short name wtd)
water_table_depth (canonical units: m)
'Depth is the vertical distance below the surface. The water table is the 
surface below which the soil is saturated with water such that all pore spaces 
are filled.'

Okay?

Best wishes,
Alison
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