Dear All,

The standard name and area type tables have both been updated. The standard 
name table is now at Version 52 and the area type table is at Version 8, both 
dated 16 May 2018. The standard name changes have also been published on the 
NERC Vocabulary Server and the area type changes will be added shortly. The 
full list of changes is given at the end of this message.

Good progress is being made on publishing the various sets of names needed for 
CMIP6 but there are more to come. There are also standard names unrelated to 
CMIP under active discussion. Due to the current high volume of names being 
processed, I will plan the next update to take place on 29th May.

Best wishes,
Alison

---

V8 area type changes

One new area type has been added in support of the CMIP6 LUMIP project:
herbaceous_vegetation
'Herbaceous plants are plants with very flexible stems. Their leaves and stems 
die down to soil level at the end of every growing season. Herbaceous plants 
can be annual, biennial or perennial.'

---

V51 standard name changes

1. New names

a. Hail and graupel names proposed by Burkhardt Rockel
atmosphere_mass_content_of_graupel (canonical units: kg m-2) 
atmosphere_mass_content_of_graupel_and_hail  (canonical units: kg m-2)
atmosphere_mass_content_of_hail  (canonical units: kg m-2)
graupel_and_hail_fall_amount (canonical units: kg m-2)
graupel_and_hail_fall_flux (canonical units: kg m-2 s-1)
graupel_fall_flux (canonical units: kg m-2 s-1)
hail_fall_amount (canonical units: kg m-2)
hail_fall_flux (canonical units: kg m-2 s-1)
mass_fraction_of_graupel_and_hail_in_air (canonical units: 1)
mass_fraction_of_hail_in_air (canonical units: 1)

b. Atmospheric composition names proposed by Maarten Sneep        
atmosphere_mole_content_of_carbon_monoxide (canonical units: mol m-2)
atmosphere_mole_content_of_methane (canonical units: mol m-2)
atmosphere_mole_content_of_nitrogen_dioxide (canonical units: mol m-2)
atmosphere_mole_content_of_water_vapor (canonical units: mol m-2)
mole_content_of_carbon_monoxide_in_atmosphere_layer (canonical units: mol m-2)
mole_content_of_methane_in_atmosphere_layer (canonical units: mol m-2)
mole_content_of_nitrogen_dioxide_in_atmosphere_layer (canonical units: mol m-2)
N.B. There is an open discussion regarding whether we should continue to have 
separate atmosphere and atmosphere_layer names for the same quantity, or make 
them aliases.

c. Coordinate variable names proposed by Sebastien Villaume for use with ocean 
models
sea_water_sigma_t_difference (canonical units: kg m-3)
sea_water_sigma_theta_difference (canonical units: kg m-3)
sea_water_temperature_difference (canonical units: K)

d. Names proposed by Martin Juckes for CMIP6 PMIP
isotope_ratio_of_17O_to_16O_in_sea_water_excluding_solutes_and_solids 
(canonical units: 1)
isotope_ratio_of_18O_to_16O_in_sea_water_excluding_solutes_and_solids 
(canonical units: 1)
mass_content_of_water_vapor_containing_17O_in_atmosphere_layer (canonical 
units: kg m-2)
mass_content_of_water_vapor_containing_18O_in_atmosphere_layer (canonical 
units: kg m-2)
mass_content_of_water_vapor_containing_single_2H_in_atmosphere_layer (canonical 
units: kg m-2)
precipitation_flux_containing_17O (canonical units: kg m-2 s-1)
precipitation_flux_containing_18O (canonical units: kg m-2 s-1)
precipitation_flux_containing_single_2H (canonical units: kg m-2 s-1)
solid_precipitation_flux_containing_17O (canonical units: kg m-2 s-1)
solid_precipitation_flux_containing_18O (canonical units: kg m-2 s-1)
solid_precipitation_flux_containing_single_2H (canonical units: kg m-2 s-1)

gross_primary_productivity_of_biomass_expressed_as_13C (canonical units: kg m-2 
s-1)
gross_primary_productivity_of_biomass_expressed_as_14C (canonical units: kg m-2 
s-1)
litter_mass_content_of_nitrogen (canonical units: kg m-2)
mass_content_of_carbon_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products
 (canonical units: kg m-2)
mass_content_of_nitrogen_in_vegetation_and_litter_and_soil_and_forestry_and_agricultural_products
 (canonical units: kg m-2)
mass_flux_of_nitrogen_compounds_expressed_as_nitrogen_out_of_litter_and_soil_due_to_immobilisation_and_remineralization
 
mass_flux_of_nitrogen_compounds_expressed_as_nitrogen_out_of_vegetation_and_litter_and_soil_due_to_leaching_and_runoff
nitrogen_mass_content_of_forestry_and_agricultural_products (canonical units: 
kg m-2)
soil_mass_content_of_nitrogen (canonical units: kg m-2)
solid_precipitation_flux (canonical units: kg m-2 s-1)
surface_net_downward_mass_flux_of_carbon_dioxide_expressed_as_13C_due_to_all_land_processes
 (canonical units: kg m-2 s-1)
surface_net_downward_mass_flux_of_carbon_dioxide_expressed_as_14C_due_to_all_land_processes
 (canonical units: kg m-2 s-1)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_13C_due_to_heterotrophic_respiration
 (canonical units: kg m-2 s-1)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_13C_due_to_plant_respiration
 (canonical units: kg m-2 s-1)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_14C_due_to_heterotrophic_respiration
 (canonical units: kg m-2 s-1)
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_14C_due_to_plant_respiration
 (canonical units: kg m-2 s-1)
surface_upward_mass_flux_of_nitrogen_compounds_expressed_as_nitrogen (canonical 
units: kg m-2 s-1)
surface_upward_mass_flux_of_nitrous_oxide_expressed_as_nitrogen_out_of_vegetation_and_litter_and_soil
 (canonical units: kg m-2 s-1)
tendency_of_vegetation_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_fixation
 (canonical units: kg m-2 s-1)
vegetation_mass_content_of_nitrogen (canonical units: kg m-2)

e. Names proposed by Martin Juckes for CMIP6 C4MIP
net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_stems 
(canonical units: kg m-2 s-1)
tendency_of_atmosphere_mass_content_of_nitrogen_compounds_expressed_as_nitrogen_due_to_anthropogenic_emission
 (canonical units: kg m-2 s-1)

f. Names proposed by Martin Juckes for CMIP6 AerChemMIP    
integral_wrt_time_of_mole_stomatal_uptake_of_ozone (canonical units: mol m-2)
tendency_of_atmosphere_mole_concentration_of_nitrous_oxide_due_to_chemical_destruction
 (canonical units: mol m-3 s-1)
volume_scattering_function_of_radiative_flux_in_air_due_to_ambient_aerosol_particles
 (canonical units: m-1 sr-1)

g. Names proposed by Martin Juckes for CMIP6 VolMIP
stratosphere_optical_thickness_due_to_ambient_aerosol_particles 
stratosphere_optical_thickness_due_to_sulfate_ambient_aerosol_particles 
(canonical units: 1)
stratosphere_optical_thickness_due_to_volcanic_ambient_aerosol_particles 
(canonical units: 1)
surface_downwelling_longwave_flux_in_air_due_to_volcanic_ambient_aerosol_particles
 (canonical units: Wm-2)
surface_downwelling_shortwave_flux_in_air_due_to_volcanic_ambient_aerosol_particles
 (canonical units: Wm-2)
tendency_of_air_temperature_due_to_longwave_heating_from_volcanic_ambient_aerosol_particles
 (canonical units: K s-1)
tendency_of_air_temperature_due_to_shortwave_heating_from_volcanic_ambient_aerosol_particles
 (canonical units: K s-1)
toa_outgoing_longwave_flux_due_to_volcanic_ambient_aerosol_particles_assuming_clear_sky
 (canonical units: Wm-2)
toa_outgoing_shortwave_flux_due_to_volcanic_ambient_aerosol_particles_assuming_clear_sky
 (canonical units: Wm-2)

h. Name proposed by Martin Juckes for CMIP6 ISMIP
land_ice_basal_temperature (canonical units: K)

i. Name proposed by Martin Juckes for CMIP6 LUMIP
surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_anthropogenic_land_use_or_land_cover_change_excluding_forestry_and_agricultural_products
 (canonical units: kg m-2 s-1)

2. New aliases

a. Aliases resulting from discussion of limits on integrals for full depth 
names (Sebastien Villaume's question 
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060018.html)
Previously we had two names 
integral_wrt_depth_of_sea_water_temperature_in_ocean_layer and 
ocean_integral_wrt_depth_of_sea_water_temperature. These had aliases of 
integral_of_sea_water_temperature_wrt_depth_in_ocean_layer and 
ocean_integral_of_sea_water_temperature_wrt_depth, respectively. The two 
existing names and their aliases have now all been turned into aliases of one 
current name.
integral_wrt_depth_of_sea_water_temperature_in_ocean_layer -> 
integral_wrt_depth_of_sea_water_temperature 
ocean_integral_wrt_depth_of_sea_water_temperature -> 
integral_wrt_depth_of_sea_water_temperature 
integral_of_sea_water_temperature_wrt_depth_in_ocean_layer -> 
integral_wrt_depth_of_sea_water_temperature 
ocean_integral_of_sea_water_temperature_wrt_depth -> 
integral_wrt_depth_of_sea_water_temperature 

b. Aliases resulting from discussion of AerChemMIP volume scattering function 
name
volume_scattering_coefficient_in_air_due_to_ambient_aerosol_particles -> 
volume_scattering_coefficient_of_radiative_flux_in_air_due_to_ambient_aerosol_particles
 
volume_scattering_coefficient_in_air_due_to_dried_aerosol_particles -> 
volume_scattering_coefficient_of_radiative_flux_in_air_due_to_dried_aerosol_particles
 

c. Martin Juckes reported a typographical error (an extra '_of_') in one 
existing name
tendency_of_atmosphere_of_mole_concentration_of_carbon_monoxide_due_to_chemical_destruction
 -> 
tendency_of_atmosphere_mole_concentration_of_carbon_monoxide_due_to_chemical_destruction
 

3. Modifications to definitions of existing names

a. Integral_wrt_depth/height names
Sebastien Villaume asked how to specify the limits of an integral calculated 
over the full depth of the ocean or atmosphere 
(http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/060018.html). It was 
agreed to amend the definitions of all integral_wrt_depth|height names to read 
as follows: 'The phrase "integral_wrt_X_of_Y" means int Y dX. To specify the 
limits of the integral the data variable should have an axis for X and 
associated coordinate bounds. If no axis for X is associated with the data 
variable, or no coordinate bounds are specified, it is assumed that the 
integral is calculated over the entire vertical extent of the medium, e.g, if 
the medium is air the integral is assumed to be calculated over the full depth 
of the atmosphere.' Previously the definitions provided no instructions for the 
full depth case. This change affects the following 11 names.
integral_wrt_depth_of_product_of_sea_water_density_and_conservative_temperature 
integral_wrt_depth_of_product_of_sea_water_density_and_potential_temperature 
integral_wrt_depth_of_product_of_sea_water_density_and_salinity 
integral_wrt_depth_of_sea_ice_temperature_expressed_as_heat_content 
integral_wrt_depth_of_sea_water_potential_temperature_expressed_as_heat_content 
integral_wrt_depth_of_sea_water_practical_salinity 
integral_wrt_depth_of_sea_water_temperature 
integral_wrt_depth_of_tendency_of_sea_water_alkalinity_expressed_as_mole_equivalent
 
integral_wrt_depth_of_tendency_of_sea_water_alkalinity_expressed_as_mole_equivalent_due_to_biological_processes
 
integral_wrt_height_of_product_of_eastward_wind_and_specific_humidity 
integral_wrt_height_of_product_of_northward_wind_and_specific_humidity 
 
b. Martin Juckes requested the addition of a definition for 
number_of_icebergs_per_unit_area so that software would not return an empty 
string or 'No help available'. A brief definition was added: 'The number of 
icebergs per unit area.'

c. Sebastien Villaume requested that the definitions of three existing ocean 
mixed layer names be modified to include references to coordinate variables. 
Standard names for the coordinate variables themselves were also added in this 
update (see 1c above).

ocean_mixed_layer_thickness_defined_by_sigma_t
'The ocean mixed layer is the upper part of the ocean, regarded as being 
well-mixed. The base of the mixed layer defined by temperature, sigma or 
sigma_theta is the level at which the quantity indicated differs from its 
surface value by a certain amount. A coordinate variable or scalar coordinate 
variable with standard name sea_water_sigma_t_difference can be used to specify 
the sigma_t criterion that determines the layer thickness.'

ocean_mixed_layer_thickness_defined_by_sigma_theta
'The ocean mixed layer is the upper part of the ocean, regarded as being 
well-mixed. The base of the mixed layer defined by temperature, sigma or 
sigma_theta is the level at which the quantity indicated differs from its 
surface value by a certain amount. A coordinate variable or scalar coordinate 
variable with standard name sea_water_sigma_theta_difference can be used to 
specify the sigma_theta criterion that determines the layer thickness.'

ocean_mixed_layer_thickness_defined_by_temperature             
'The ocean mixed layer is the upper part of the ocean, regarded as being 
well-mixed. The base of the mixed layer defined by temperature, sigma or 
sigma_theta is the level at which the quantity indicated differs from its 
surface value by a certain amount. A coordinate variable or scalar coordinate 
variable with standard name sea_water_temperature_difference can be used to 
specify the temperature criterion that determines the layer thickness.'

d. A typographical error was corrected in the definition of soil_pool.

e. The definition of volume_scattering_function_of_radiative_flux_in_sea_water 
was updated to be consistent with that of the new AerChemMIP name  
volume_scattering_function_of_radiative_flux_in_air_due_to_ambient_aerosol_particles.
 The definition now reads:
'Radiative flux is the sum of shortwave and longwave radiative fluxes. 
Scattering of radiation is its deflection from its incident path without loss 
of energy. The volume scattering function is the intensity (flux per unit solid 
angle) of scattered radiation per unit length of scattering medium, normalised 
by the incident radiation flux. The (range of) direction(s) of scattering can 
be specified by a coordinate of scattering_angle. A coordinate variable of 
radiation_wavelength or radiation_frequency can be specified to indicate that 
the scattering applies at specific wavelengths or frequencies.'

---

------
Alison Pamment                                 Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival    Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory     
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.

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