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mole_content_of_organic_mercury_in_macrobenthos mol m-2 [MLM2] P07 id: 594RQ52K
"Content" indicates a quantity per unit area. "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. "Macrobenthos" refers to benthic organisms visible to the naked eye.
Updated term description
#298 EDescourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments: Corrected typo in description (added missing word 'are' in description "mercury atoms [are] covalently bonded").
View accepted
reduced_gaussian_index 1 [uuuu]
Reduced Gaussian indices indicate the latitude and longitude location of cells, including their cell bounds, of a reduced Gaussian grid on a sphere. The relationship between reduced gaussian indices and latitude and longitude is described by the grid_mapping variable with a grid_mapping_name of "reduced_gaussian", that must be attached to the data variable as described in Chapter 5.6 of the CF Convention. A reduced gaussian index variable must have an integer data type.
New Term
#312 David Hassell (2026-06-06) Standard names: reduced_gaussian_index Comments: add to cfeditor
View accepted
mole_concentration_of_particulate_organic_carbon_expressed_as_carbon_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Particulate means suspended solids of all sizes. "Organic carbon" describes a family of chemical species and is the term used in standard names for all species belonging to the family that are represented within a given model. Where possible, the data variable should be accompanied by a complete description of the species represented, for example, by using a comment attribute. 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.
New Term
View accepted
mass_concentration_of_phytoplankton_expressed_as_carbon_in_sea_water kg m-3 [UKMC]
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Phytoplankton are algae that grow where there is sufficient light to support photosynthesis. 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. Standard names also exist for the mass concentration of a number of components that make up the total phytoplankton population, such as diatoms, diazotrophs, calcareous phytoplankton, picophytoplankton and miscellaneous phytoplankton.
New Term
View accepted
probability_of_mass_concentration_of_volcanic_ash_in_air_at_or_above_threshold 1 [UUUU]
"probability_of_X_at_or_above_threshold" means the chance that X is at or above the threshold. Space and time coordinates must be used to indicate the area and time to which a probability applies. "Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Volcanic ash" means the fine-grained products of explosive volcanic eruptions, such as minerals or crystals, older fragmented rock (e.g. andesite) and glass. Particles within a volcanic ash cloud have diameters less than 2 mm. "Volcanic ash" does not include non-volcanic dust. It must have a coordinate variable or scalar coordinate variable with the standard name of mass_concentration_of_volcanic_ash_in_air to supply the threshold(s).
Term change from: probability_of_mass_concentration_of_volcanic_ash_in_air_above_threshold
View accepted
sea_surface_height_amplitude_due_to_non_equilibrium_ocean_tide m [ULAA] P07 id: CFV10N38
"Sea surface height" is a time-varying quantity. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. 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. Tides are a significant contributor to the observed sea surface height; non equilibrium ocean tide refers to the long period ocean tide.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
sea_surface_height_amplitude_due_to_pole_tide m [ULAA] P07 id: CFV10N39
"Sea surface height" is a time-varying quantity. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. 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. Tides are a significant contributor to the observed sea surface height; the pole tide occurs due to variations in the earth's rotation.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
amplitude_of_global_average_sea_level_change m [ULAA] P07 id: ZSDAR2KM
Global average sea level change is due to change in volume of the water in the ocean, caused by mass and/or density change, or to change in the volume of the ocean basins, caused by tectonics etc. It is sometimes called "eustatic", which is a term that also has other definitions. It differs from the change in the global average sea surface height relative to the centre of the Earth by the global average vertical movement of the ocean floor. Zero sea level change is an arbitrary level. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. Because global average sea level change quantifies the change in volume of the world ocean, it is not calculated necessarily by considering local changes in mean sea level.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
sea_surface_height_amplitude_due_to_earth_tide m [ULAA] P07 id: CFV10N35
"Sea surface height" is a time-varying quantity. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. 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. Tides are a significant contributor to the observed sea surface height; earth tide means the solid earth tide.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
sea_surface_height_amplitude_due_to_equilibrium_ocean_tide m [ULAA] P07 id: CFV10N36
"Sea surface height" is a time-varying quantity. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. 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. Tides are a significant contributor to the observed sea surface height; equilibrium ocean tide refers to the long period ocean tide.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
sea_surface_height_amplitude_due_to_geocentric_ocean_tide m [ULAA] P07 id: CFV10N37
"Sea surface height" is a time-varying quantity. Amplitude is the magnitude of a periodic variation modeled by a sinusoidal function. A coordinate variable of harmonic_period should be used to specify the period of the sinusoidal function. 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. Tides are a significant contributor to the observed sea surface height; geocentric ocean tide means the sum total of ocean tide and load tide.
Updated term description
#304 Matthias Lankhorst (2026-03-25) Standard names: *how to interpret names for certain tide parameters* Comments:
View accepted
mass_concentration_of_large_pelagic_fish_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: G1IP6NWI
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Large pelagic fish (>250 g) live in waters near the surface or throughout the water column (e.g., tuna, marlin, pelagic sharks). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_mature_individuals_of_biological_taxon_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: 0IFTNCTW
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Mature individuals refer to individuals that have reached sexual maturity. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_mesopelagic_fish_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: TEHQ4X3K
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Mesopelagic fish live in the mesopelagic or “Twilight Zone” at depths of about 200-1000 m, where light is limited. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_bathypelagic_fish_expressed_as_wet_weight kg m-2 [KMP2] P07 id: QY06XVNL
"Content" indicates a quantity per unit area. Bathypelagic fish are deep-sea fish that live at depths of about 1000-3000 m in cold and dark waters. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_demersal_fish_expressed_as_wet_weight kg m-2 [KMP2] P07 id: 36UW7DBQ
"Content" indicates a quantity per unit area. Demersal fish spend a fraction of their lives in close association with the seabed, feeding primarily on bottom organisms, they can carry out diel vertical migrations (e.g. cod). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_immature_individuals_of_biological_taxon_expressed_as_wet_weight kg m-2 [KMP2] P07 id: 775ZJ0F5
"Content" indicates a quantity per unit area. Immature individuals refer to individuals that have not yet reached sexual maturity. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_large_pelagic_fish_expressed_as_wet_weight kg m-2 [KMP2] P07 id: WB8FZZ5U
"Content" indicates a quantity per unit area. Large pelagic fish (>250 g) live in waters near the surface or throughout the water column (e.g., tuna, marlin, pelagic sharks). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_mesopelagic_fish_expressed_as_wet_weight kg m-2 [KMP2] P07 id: GOF95M8G
"Content" indicates a quantity per unit area. Mesopelagic fish live in the mesopelagic or “Twilight Zone” at depths of about 200-1000 m, where light is limited. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_small_pelagic_fish_expressed_as_wet_weight kg m-2 [KMP2] P07 id: GTTTDBLZ
"Content" indicates a quantity per unit area. Small pelagic fish (<=250 g) live in waters near the surface or throughout the water column (e.g., herring, sardines, anchovies). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_biological_taxon_expressed_as_wet_weight kg m-2 [KMP2] P07 id: PXKN80UB
"Content" indicates a quantity per unit area. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_small_pelagic_fish_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: CVWA4OGB
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Small pelagic fish (<=250 g) live in waters near the surface or throughout the water column (e.g., herring, sardines, anchovies). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
ocean_mass_content_of_mature_individuals_of_biological_taxon_expressed_as_wet_weight kg m-2 [KMP2] P07 id: EWJHAWB4
"Content" indicates a quantity per unit area. Mature individuals refer to individuals that have reached sexual maturity. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_bathypelagic_fish_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: O0YEG6TL
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Bathypelagic fish are deep-sea fish that live at depths of about 1000-3000 m in cold and dark waters. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_biological_taxon_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: CAEP7HDI
Total biomass or biomass per age group in years (standard birth date January 1) of various fish species as identified by their taxonomic name (e.g. Sardina pilchardus) in gram per m3. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_demersal_fish_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: 889V9VVB
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Demersal fish spend a fraction of their lives in close association with the seabed, feeding primarily on bottom organisms, they can carry out diel vertical migrations (e.g. cod). 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
mass_concentration_of_immature_individuals_of_biological_taxon_expressed_as_wet_weight_in_sea_water kg m-3 [UKMC] P07 id: XY16HWNE
"Mass concentration" means mass per unit volume and is used in the construction "mass_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Immature individuals refer to individuals that have not yet reached sexual maturity. "Biological taxon" is a name or other label identifying an organism or a group of organisms as belonging to a unit of classification in a hierarchical taxonomy. There must be an auxiliary coordinate variable with standard name biological_taxon_name to identify the taxon in human readable format and optionally an auxiliary coordinate variable with standard name biological_taxon_identifier to provide a machine-readable identifier. See Section 6.1.2 of the CF convention (version 1.8 or later) for information about biological taxon auxiliary coordinate variables. 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. Wet weight is the weight of a material, organism, or sample including its water (moisture) content, measured before drying.
Updated term description
#280 Aurore BIARDEAU (2025-08-19) Standard names: *Species Group* Comments:
View accepted
atmosphere_optical_thickness_due_to_secondary_particulate_organic_matter_ambient_aerosol_particles 1 [UUUU] P07 id: EKTT9B75
The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. The atmosphere optical thickness applies to radiation passing through the entire 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. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature".
Updated term description
View accepted
atmosphere_optical_thickness_due_to_biomass_burning_particulate_matter_ambient_aerosol_particles 1 [UUUU] P07 id: OITMP30K
The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. The atmosphere optical thickness applies to radiation passing through the entire 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. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature".
Updated term description
View accepted
atmosphere_optical_thickness_due_to_ambient_aerosol_particles_assuming_clear_sky 1 [UUUU] P07 id: QW5TE9YE
The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-"optical_thickness") on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. The atmosphere optical thickness applies to radiation passing through the entire 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. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature". A phrase "assuming_condition" indicates that the named quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition. "Clear sky" means in the absence of clouds.
Updated term description
View accepted
fractional_saturation_of_aragonite_in_sea_water 1 [UUUU]
Fractional saturation is the ratio of some measure of concentration to the saturated value of the same quantity. Above 1 the solution is supersaturated, below 1 the solution is undersaturated, at 1 it is at the equilibrium. Aragonite is a mineral that is a polymorph of calcium carbonate. The chemical formula of aragonite is CaCO3. Standard names also exist for calcite, another polymorph of calcium carbonate. This variable is also referred to as aragonite saturation state.
New Term
#311 Tomas Lovato (2026-05-28) Standard names: ocean Aragonite and Calcite saturation state Comments:
View accepted
fractional_saturation_of_calcite_in_sea_water 1 [UUUU]
Fractional saturation is the ratio of some measure of concentration to the saturated value of the same quantity. Above 1 the solution is supersaturated, below 1 the solution is undersaturated, at 1 it is at the equilibrium. Calcite is a mineral that is a polymorph of calcium carbonate. The chemical formula of calcite is CaCO3. Standard names also exist for aragonite, another polymorph of calcium carbonate. This variable is also referred to as calcite saturation state.
New Term
#311 Tomas Lovato (2026-05-28) Standard names: ocean Aragonite and Calcite saturation state Comments:
View accepted
sea_ice_surface_temperature K [UPKA] P07 id: CFV16A37
The surface temperature is the (skin) temperature at the interface, not the bulk temperature of the medium above or below. "Sea ice surface temperature" is the temperature that exists at the interface of sea ice and an overlying medium which may be air or snow. In areas of snow covered sea ice, sea_ice_surface_temperature is not the same as the quantity with standard name surface_temperature. "Sea ice" means all ice floating in the sea which has formed from freezing sea water, rather than by other processes such as calving of land ice to form icebergs. It is strongly recommended that a variable with this standard name should have a units_metadata attribute, with one of the values "on-scale" or "difference", whichever is appropriate for the data, because it is essential to know whether the temperature is on-scale (meaning relative to the origin of the scale indicated by the units) or refers to temperature differences (implying that the origin of the temperature scale is irrelevant), in order to convert the units correctly (cf. https://cfconventions.org/cf-conventions/cf-conventions.html#temperature-units).
Updated term description
#310 Martin Schupfner (2026-05-28) Standard names: sea_or_inland_water_ice_surface_temperature Comments:
View accepted
moles_of_organic_mercury_per_unit_mass_of_phytoplankton_expressed_as_carbon mol kg-1 [MLKG] P07 id: VJ7ZCJ1D
The construction "moles_of_X_per_unit_mass_in_Y" is also called "molality" of X in Y, where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. Phytoplankton are algae that grow where there is sufficient light to support photosynthesis. 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.
Updated term description
#298 EDescourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments: Update description of organic mercury to remove example species.
View accepted
moles_of_organic_mercury_per_unit_mass_of_zooplankton_expressed_as_carbon mol kg-1 [MLKG] P07 id: BPWVMJGB
The construction "moles_of_X_per_unit_mass_in_Y" is also called "molality" of X in Y, where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. "Zooplankton" means the total zooplankton population, with components such as mesozooplankton, microzooplankton and miscellaneous zooplankton. 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.
Updated term description
#298 EDescourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments: Update description of organic mercury to remove example species.
View accepted
mole_concentration_of_oxidized_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Oxidized mercury" refers to mercury in its ionic form, which may be directly emitted to the environment or formed through the oxidation of elemental mercury.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_dissolved_oxidized_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Dissolved oxidized mercury" refers to mercury ions present in water in dissolved form, often as free ions or partially dissociated salts, or as complexes with other dissolved molecules.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_oxidized_mercury_in_phytoplankton mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Oxidized mercury" refers to mercury in its ionic form, which may be directly emitted to the environment or formed through the oxidation of elemental mercury. Phytoplankton are algae that grow where there is sufficient light to support photosynthesis.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_dissolved_elemental_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Dissolved elemental mercury" refers to mercury in its neutral form, a gaseous species that is dissolved in water. It can be measured as dissolved gaseous mercury.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_oxidized_mercury_in_zooplankton mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Oxidized mercury" refers to mercury in its ionic form, which may be directly emitted to the environment or formed through the oxidation of elemental mercury. "Zooplankton" means the total zooplankton population, with components such as mesozooplankton, microzooplankton and miscellaneous zooplankton.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_oxidized_mercury_in_fish mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Oxidized mercury" refers to mercury in its ionic form, which may be directly emitted to the environment or formed through the oxidation of elemental mercury. "in_fish" refers to fish tissue considered as the biological medium in which the quantity is measured.
New Term
#299 Emmanuelle Descourvieres (2026-01-12) Standard names: *Oxidized Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_particulate_organic_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". Particulate means suspended solids of all sizes. "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_organic_mercury_in_phytoplankton mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. Phytoplankton are algae that grow where there is sufficient light to support photosynthesis.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_organic_mercury_in_zooplankton mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. "Zooplankton" means the total zooplankton population, with components such as mesozooplankton, microzooplankton and miscellaneous zooplankton.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_organic_mercury_in_phycosphere mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. "Phycosphere" refers to the microenvironment surrounding phytoplankton cells.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_organic_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_dissolved_organic_mercury_in_sea_water mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Dissolved organic mercury" refers to mercury that is covalently bonded to carbon (organic forms) and present in water in dissolved form, often occuring as ionic species or as complexes with dissolved molecules.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
mole_concentration_of_organic_mercury_in_fish mol m-3 [MLM3]
"Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Organic mercury" describes a family of chemical species in which mercury atoms are covalently bonded to carbon-containing groups, forming organomercury compounds. The phrase "in_fish" refers to fish tissue considered as the biological medium in which the quantity is measured.
New Term
#298 Emmanuelle Descourvieres (2026-01-12) Standard names: *Organic Mercury - mole_concentration* Comments:
View accepted
sea_ice_area_with_sea_ice_area_fraction_at_or_above_threshold m2 [UMSQ]
"Sea ice" means all ice floating in the sea which has formed from freezing sea water, rather than by other processes such as calving of land ice to form icebergs. Sea ice area fraction is area of the sea surface occupied by sea ice. It is also called "sea ice concentration". "Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The value is equal to the sea_ice_area where sea_ice_area_fraction is at or above the threshold. Otherwise, the value is zero. The area threshold value must be specified by supplying a coordinate variable or scalar coordinate variable with the standard name of sea_ice_area_fraction.
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
floating_ice_area_fraction_where_at_or_above_threshold 1 [XXXX]
"Floating ice" means all floating ice, including frozen sea water, frozen lake water, shelf ice, and calved land ice. "Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. Unless indicated, a quantity is assumed to apply to the whole area of each horizontal grid box. The qualifier "where_" type specifies instead that the quantity applies only to the part of the grid box of the named type. The value is equal to the floating_ice_area_fraction where it is at or above the threshold. Otherwise, the value is zero. The area threshold value must be specified by supplying a coordinate variable or scalar coordinate variable with the standard name of floating_ice_area_fraction.
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
floating_ice_area_with_floating_ice_area_fraction_at_or_above_threshold m2 [UMSQ]
"Floating ice" means all floating ice, including frozen sea water, frozen lake water, shelf ice, and calved land ice. "Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The value is equal to the floating_ice_area where floating_ice_area_fraction is at or above the threshold. Otherwise, the value is zero. The area threshold value must be specified by supplying a coordinate variable or scalar coordinate variable with the standard name of floating_ice_area_fraction.
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
sea_ice_area_fraction_where_at_or_above_threshold 1 [XXXX]
Sea ice area fraction is area of the sea surface occupied by sea ice. It is also called "sea ice concentration". "Sea ice" means all ice floating in the sea which has formed from freezing sea water, rather than by other processes such as calving of land ice to form icebergs. "Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. Unless indicated, a quantity is assumed to apply to the whole area of each horizontal grid box. The qualifier "where_" type specifies instead that the quantity applies only to the part of the grid box of the named type. The value is equal to the sea_ice_area_fraction where it is at or above the threshold. Otherwise, the value is zero. The area threshold value must be specified by supplying a coordinate variable or scalar coordinate variable with the standard name of sea_ice_area_fraction.
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
floating_ice_area m2 [UMSQ]
"Floating ice" means all floating ice, including frozen sea water, frozen lake water, shelf ice, and calved land ice. "X_area" means the horizontal area occupied by X within the grid cell. The extent of an individual grid cell is defined by the horizontal coordinates and any associated coordinate bounds or by a string valued auxiliary coordinate variable with a standard name of "region".
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
floating_ice_area_fraction 1 [XXXX]
"Floating ice" means all floating ice, including frozen sea water, frozen lake water, shelf ice, and calved land ice. "Area fraction" is the fraction of a grid cell's horizontal area that has some characteristic of interest. It is evaluated as the area of interest divided by the grid cell area, or if the cell_methods restricts the evaluation to some portion of that grid cell (e.g. "where sea_ice"), then it is the area of interest divided by the area of the identified portion. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction.
New Term
#271 Bruce Calvert (2025-08-02) Standard names: floating_ice_area_fraction and related names Comments: add to cfeditor
View accepted
atmosphere_hybrid_sigma_ln_pressure_coordinate 1 [UUUU]
See Appendix D of the CF convention for information about parametric vertical coordinates.
New Term
#264 James Anstey (2025-05-30) parametric vertical coordinate using atmospheric log-pressure Comments: question, add to cfeditor
View accepted
water_volume_contained_in_river_channel m3 [MCUB]
The river_channel represents a body of water flowing along a natural channel and storage refers to the amount of water stored in that channel. The quantity includes unsalted liquid water.
New Term
Dikra Khedhaouiria (2021-10-06) Standard names: river discharge and storage Comments: Github #134 1.

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