[CF-metadata] PMIP (including 1 or more that originated in C4MIP) Standard Names: Carbon and Nitrogen terms

From: Martin Juckes - UKRI STFC <martin.juckes>
Date: Mon, 23 Apr 2018 15:49:42 +0000

Dear All,


below is a list of new terms required for the CMIP6 data request. They are mainly variations of existing terms using established patterns. There is a new concept in the form of "immobilisation" of nitrogen in term (2) below.


regards,

Martin

(1) cLand Total Carbon in All Terrestrial Carbon Pools [kg m-2]
Similar to c13land, c14Land in C4MIP which have:
mass_content_of_13C_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products

mass_content_of_carbon_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products

(2) c13Soil [kg m-2]
Follow the pattern established by litter_mass_content_of_13C

soil_mass_content_of_13C

(3) c14Soil [kg m-2]
As for c13Soil

soil_mass_content_of_14C

(4) gppc13 [kg m-2 s-1]
As for gross_primary_productivity_of_biomass_expressed_as_carbon, but for carbon13

gross_primary_productivity_of_biomass_expressed_as_13C
"Production of carbon" means the production of biomass expressed as the mass of carbon which it contains. Gross primary production is the rate of synthesis of biomass from inorganic precursors by autotrophs ("producers"), for example, photosynthesis in plants or phytoplankton. The producers also respire some of this biomass and the difference is "net_primary_production". "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. "C" means the element carbon and "13C" is the stable isotope "carbon-13", having six protons and seven neutrons.

(5) gppc14 [kg m-2 s-1]
As (4), but for carbon14

gross_primary_productivity_of_biomass_expressed_as_14C
"Production of carbon" means the production of biomass expressed as the mass of carbon which it contains. Gross primary production is the rate of synthesis of biomass from inorganic precursors by autotrophs ("producers"), for example, photosynthesis in plants or phytoplankton. The producers also respire some of this biomass and the difference is "net_primary_production". "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.
"C" means the element carbon and "14C" is the stable isotope "carbon-13", having six protons and seven neutrons.

(6) netAtmosLandC13Flux [kg m-2 s-1]
Follows from existing name surface_net_downward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_all_land_processes
  surface_net_downward_mass_flux_of_13C_dioxide_expressed_as_13C_due_to_all_land_processes
I.e. the mass of 13C in the downward CO2 flux.

(7) netAtmosLandC14Flux [kg m-2 s-1]
As (6), but for 14C

surface_net_downward_mass_flux_of_14C_dioxide_expressed_as_14C_due_to_all_land_processes

(8) rac13 : Mass Flux of 13C into Atmosphere due to Autotrophic (Plant) Respiration on Land (kg m-2 s-1)
 As surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_plant_respiration, but for 13C:

surface_upward_mass_flux_of_13C_dioxide_expressed_as_13C_due_to_plant_respiration

(9) rac14 : Mass Flux of 14C into Atmosphere due to Autotrophic (Plant) Respiration on Land (kg m-2 s-1)

surface_upward_mass_flux_of_14C_dioxide_expressed_as_14C_due_to_plant_respiration


(10) rhc13 : Mass Flux of 13C into Atmosphere due to Heterotrophic Respiration on Land (kg m-2 s-1)

surface_upward_mass_flux_of_13C_dioxide_expressed_as_13C_due_to_heterotrophic_respiration

(11) rhc14 : Mass Flux of 14C into Atmosphere due to Heterotrophic Respiration on Land (kg m-2 s-1)

surface_upward_mass_flux_of_14C_dioxide_expressed_as_14C_due_to_heterotrophic_respiration

(12) nLand : Total nitrogen in all terrestrial nitrogen pools [kg m-2]
Cf. c13Land
mass_content_of_nitrogen_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products

(13) nLitter : Nitrogen Mass in Litter Pool [kg m-2]
Cf. c13Litter
litter_mass_content_of_nitrogen

(14) nProduct : Nitrogen Mass in Products of Land Use Change [kg m-2]
based on carbon_content_of_forestry_and_agricultural_products

nitrogen_content_of_forestry_and_agricultural_products

(15) nSoil : Nitrogen Mass in Soil Pool [kg m-2]
Based on "soil_carbon_content":

soil_nitrogen_content

(16) nVeg : Nitrogen Mass in Vegetation [kg m-2]
Based on "vegetation_mass_content_of_13C":

vegetation_mass_content_of_nitrogen

(17) fN2O : Total land N2O flux [kg m-2 s-1]
Follow fNOx being handled in C4MIP:

surface_upward_mass_flux_of_nitrous_oxide_expressed_as_nitrogen_out_of_vegetation_and_litter_and_soil

(18) fNgas : Total Nitrogen lost to the atmosphere (sum of NHx, NOx, N2O, N2) [kg m-2 s-1]

surface_upward_mass_flux_of_nitrogen
"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 surface called "surface" means the lower boundary of the atmosphere. Nitrogen" summarizes all chemical species containing nitrogen atoms. The standard name surface_downward_mole_flux_of_carbon_dioxide should be used to label data in which the flux is positive when directed downward."

(19) fNleach : Total N loss to leaching or runoff (sum of ammonium, nitrite and nitrate) [kg m-2 s-1]
As for C4MIP fNloss, but "due_to_leaching_and_runoff", as for existing name mass_flux_of_carbon_out_of_soil_due_to_leaching_and_runoff

mass_flux_of_nitrogen_compounds_expressed_as_nitrogen_out_of_vegetation_and_litter_and_soil_due_to_leaching_and_runoff (kg m-2 s-1)

(20) fNnetmin : Net nitrogen release from soil and litter as the outcome of nitrogen immobilisation and gross mineralisation [kg m-2 s-1]

There is an existing reference to "remineralization" in the CF list, with the interpretation "Remineralization is the degradation of organic matter into inorganic forms of carbon, nitrogen, phosphorus and other micronutrients, which consumes oxygen and releases energy."

There is no previous reference to "immobilisation": we propose the following help text to explain the term: "Immobilisation of nitrogen refers to retention of nitrogen by micro-organisms under certain conditions, making it unavailable for plants."

mass_flux_of_nitrogen_compounds_expressed_as_nitrogen_out_of_litter_and_soil_due_to_immobilisation_and_remineralization

(21) fNup : total plant nitrogen uptake (sum of ammonium and nitrate), irrespective of the source of nitrogen [kg m-2 s-1]
Similar to tendency_of_soil_and_vegetation_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_fixation (kg m-2 s-1) (fBNF, C4MIP, under discussion), but for vegetation rather than soil:

tendency_of_vegetation_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_fixation (kg m-2 s-1)
Received on Mon Apr 23 2018 - 09:49:42 BST