Proposals for CF

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83 proposals match your search

indicative_error_from_multibeam_acoustic_doppler_velocity_profiler_in_sea_water

under discussion
Proposer: It is determined by the difference between the vertical velocity calculated from two 3-beam solutions.
Proposed Date: Feb. 1, 2021
Comments:
Units: m s-1 (UVAA)
Updated term description
Sea water velocity is a vector quantity that is the speed at which water travels in a specified direction. The "indicative error" is an estimate of the quality of a sea water velocity profile measured using an ADCP (acoustic doppler current profiler). It is determined by the difference between the vertical velocity calculated from two 3-beam solutions. The parameter is frequently referred to as the "error velocity".

beam_consistency_indicator_from_multibeam_acoustic_doppler_velocity_profiler_in_sea_water

under discussion
Proposer: The "beam_consistency_indicator" is the degree to which the received acoustic pulse is correlated with the transmitted pulse.
Proposed Date: Feb. 1, 2021
Comments:
Units: 1 (UUUU)
Updated term description
The "beam_consistency_indicator" is the degree to which the received acoustic pulse is correlated with the transmitted pulse. It is used as a data quality assessment parameter in ADCP (acoustic doppler current profiler) instruments and is frequently referred to as "correlation magnitude". Convention is that the larger the value, the higher the signal to noise ratio and therefore the better the quality of the current vector measurements; the maximum value of the indicator is 128.

altimeter_setting

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: Pa (PASX)
New Term
The air pressure value, to which an aircraft altimeter scale is set, so that it will indicate the altitude above mean sea level pressure of an aircraft on the ground, at the location for which the value was determined. Commonly reported as inches of mercury for a METAR observation.

surface_ice_area_fraction

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: 1 (UUUU)
New Term
"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. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The surface called "surface" means the lower boundary of the atmosphere. The phrase "surface_ice" means ice lying on the surface.

predominant_vegetation_type_at_surface

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: 1 (UUUU)
New Term
A variable with the standard name predominant_vegetation_type_at_surface contains strings which indicate the character of the predominant vegetation type at a location or grid cell. These strings have not yet been standardized. Alternatively, the data variable may contain integers which can be translated to strings using flag_values and flag_meanings attributes. "Vegetation" means any plants e.g. trees, shrubs, grass. The term "plants" refers to the kingdom of plants in the modern classification which excludes fungi. Plants are autotrophs i.e. "producers" of biomass using carbon obtained from carbon dioxide.

eastward_storm_motion

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: m s-1 (UVAA)
New Term
The eastward component of storm motion. “Eastward” indicates a vector component which is positive when directed eastward (negative westward). Storm motion is defined as the average speed of a storm and the direction the storm will move from.

northward_storm_motion

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: m s-1 (UVAA)
New Term
The northward component of storm_motion. "Northward" indicates a vector component which is positive when directed northward (negative southward). Storm_motion is defined as the average speed of a storm and the direction the storm will move from.

atmosphere_helicity

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: m2 s-2 (SQM2)
New Term
One-half the scalar product of the air velocity and vorticity vectors, where vorticity refers to the standard name atmosphere_upward_absolute_vorticity. Helicity is proportional to the strength of the flow, the amount of vertical wind shear, and the amount of turning in the flow.

bunkers_storm_motion

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: m s-1 (UVAA)
New Term
Storm motion is defined as a two dimensional velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) Storm motion follows the methodology outlined in Bunkers et al. (2000). It is defined as the average speed of a supercell, and the direction the storm will move from. It is not dependent on the orientation of the ground-relative winds.

sea_ice_binary_mask

under discussion
Proposer: Emily Schlie, Eric Engle, and the CAMPS team
Proposed Date: Dec. 22, 2020
Comments:
CF mailing list link: Standard names: **
Units: 1 (UUUU)
New Term
X"_binary_mask" has 1 where condition X is met, 0 elsewhere. The value is 1 where the ice cover area fraction is greater than a threshold, and 0 elsewhere. The threshold must be specified by associating a coordinate variable or scalar coordinate variable with the data variable and giving the coordinate variable a standard name of surface_ice_area_fraction. The values of the coordinate variable are the threshold values for the corresponding subarrays of the data variable.

sea_surface_wave_mean_wavenumber_from_variance_spectral_density_first_wavenumber_moment

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: m-1 (UPRM)
New Term
The wave directional spectrum can be written as a five dimensional function S(t,x,y,k,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), k is wavenumber and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. Wavenumber is the number of oscillations of a wave per unit distance. Wavenumber moments, M(n) of S1 can then be calculated as follows: M(n) = integral(S1 k^n dk), where k^n is k to the power of n. The mean wavenumber, k(1), is calculated as the ratio M(1)/M(0).

sea_surface_wave_yy_radiation_stress

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
“Sea surface wave radiation stress” describes the excess momentum flux caused by sea surface waves. Radiation stresses behave as a second-order tensor. “yy” indicates the component of the tensor along the grid y_ axis.

sea_surface_wave_xx_radiation_stress

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
“Sea surface wave radiation stress” describes the excess momentum flux caused by sea surface waves. Radiation stresses behave as a second-order tensor. “xx” indicates the component of the tensor along the grid x_ axis.

sea_surface_wave_xy_radiation_stress

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
“Sea surface wave radiation stress” describes the excess momentum flux caused by sea surface waves. Radiation stresses behave as a second-order tensor. “xy” indicates the lateral contributions to x_ and y_ components of the tensor.

eastward_friction_velocity_in_air

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). Friction velocity is a reference wind velocity derived from the relationship between air density and downward stress and is usually applied at a level close to the surface where stress is assumed to independent of height and approximately proportional to the square of mean velocity.

northward_friction_velocity_in_air

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). Friction velocity is a reference wind velocity derived from the relationship between air density and downward stress and is usually applied at a level close to the surface where stress is assumed to independent of height and approximately proportional to the square of mean velocity.

surface_downward_northward_stress_due_to_ocean_viscous_dissipation

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted by the wind at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, wind stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Northward" indicates a vector component which is positive when directed northward (negative southward). "Downward northward" indicates the ZY component of a tensor. A downward northward stress is a downward flux of northward momentum, which accelerates the lower medium northward and the upper medium southward. 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. "Viscosity" means the stress associated with viscous effects at the sea surface and is equivalent to the turbulent stress just outside the viscous sublayer.

surface_upward_eastward_stress_due_to_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted at the surface. An upward stress is an upward flux of momentum into the atmosphere. "Upward" indicates a vector component which is positive when directed upward (negative downward). "Eastward" indicates a vector component which is positive when directed northward (negative southward). "Upward eastward" indicates the ZX component of a tensor. An upward eastward stress is an upward flux of eastward momentum, which accelerates the upper medium eastward and the lower medium westward. 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. "Sea surface waves" means the stress associated with oscillatory motions of a wavy sea surface.

surface_downward_northward_stress_due_to_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted by the wind at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, wind stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Northward" indicates a vector component which is positive when directed northward (negative southward). "Downward northward" indicates the ZY component of a tensor. A downward northward stress is a downward flux of northward momentum, which accelerates the lower medium northward and the upper medium southward. 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. "Sea surface waves" means the stress associated with form drag over sea surface waves.

surface_downward_eastward_stress_due_to_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted by the wind at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, wind stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Eastward" indicates a vector component which is positive when directed northward (negative southward). "Downward eastward" indicates the ZX component of a tensor. A downward eastward stress is a downward flux of eastward momentum, which accelerates the lower medium eastward and the upper medium westward. 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. "Sea surface waves" means the stress associated with form drag over sea surface waves.

sea_surface_downward_northward_stress_due_to_dissipation_of_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "sea surface" means the upper boundary of the ocean. "Surface stress" means the shear stress (force per unit area) exerted at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, surface stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Northward" indicates a vector component which is positive when directed northward (negative southward). "Downward northward" indicates the ZY component of a tensor. A downward northward stress is a downward flux of northward momentum, which accelerates the lower medium northward and the upper medium southward. 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 phrase "dissipation_of_sea_surface_waves" means the stress associated with sea surface waves dissipation processes such as whitecapping.

surface_upward_northward_stress_due_to_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted at the surface. An upward stress is an upward flux of momentum into the atmosphere. "Upward" indicates a vector component which is positive when directed upward (negative downward). "Northward" indicates a vector component which is positive when directed northward (negative southward). "Upward northward" indicates the ZY component of a tensor. An upward northward stress is an upward flux of northward momentum, which accelerates the upper medium northward and the lower medium southward. 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. "Sea surface waves" means the stress associated with oscillatory motions of a wavy sea surface.

surface_downward_eastward_stress_due_to_ocean_viscous_dissipation

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted by the wind at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, wind stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Eastward" indicates a vector component which is positive when directed northward (negative southward). "Downward eastward" indicates the ZX component of a tensor. A downward eastward stress is a downward flux of eastward momentum, which accelerates the lower medium eastward and the upper medium westward. 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. "Viscosity" means the stress associated with viscous effects at the sea surface and is equivalent to the turbulent stress just outside the viscous sublayer.

sea_surface_downward_eastward_stress_due_to_dissipation_of_sea_surface_waves

under discussion
Proposer: Andy Saulter
Proposed Date: Feb. 1, 2021
Comments:
Units: Pa (PASX)
New Term
The surface called "sea surface" means the upper boundary of the ocean. "Surface stress" means the shear stress (force per unit area) exerted at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, surface stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Eastward" indicates a vector component which is positive when directed northward (negative southward). "Downward eastward" indicates the ZX component of a tensor. A downward eastward stress is a downward flux of eastward momentum, which accelerates the lower medium eastward and the upper medium westward. 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 phrase "dissipation_of_sea_surface_waves" means the stress associated with sea surface waves dissipation processes such as whitecapping.

snow_area_fraction_viewable_from_above

under discussion
Proposer: Andreas Wiesmann
Proposed Date: Jan. 26, 2021
Comments:
"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. It may be expressed as a fraction, a percentage, or any other dimensionless representation of a fraction. The surface called "surface" means the lower boundary of the atmosphere. Surface snow refers to the snow on the solid ground or on surface ice cover, but excludes, for example, falling snowflakes and snow on plants. "Canopy" means the vegetative covering over a surface. The canopy is often considered to be the outer surfaces of the vegetation. Plant height and the distribution, orientation and shape of plant leaves within a canopy influence the atmospheric environment and many plant processes within the canopy. Reference: AMS Glossary http://glossary.ametsoc.org/wiki/Canopy.

realization

accepted
Proposer: David Hassell
Proposed Date: Feb. 4, 2021
Comments:
Units: 1 (UUUU)
Updated term description
Realization is used to label a dimension that can be thought of as a statistical sample, e.g., labelling members of a model ensemble.

sea_surface_wave_period_at_variance_spectral_density_maximum

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: s (UTBB)
Updated term description
A period is an interval of time, or the time-period of an oscillation. The sea_surface_wave_period_at_variance_spectral_density_maximum, sometimes called peak wave period, is the period of the most energetic waves in the total wave spectrum at a specific location. Wave period is the interval of time between repeated features on the waveform such as crests, troughs or upward passes through the mean level. The wave directional spectrum can be written as a five dimensional function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), f is frequency and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. The density of a substance is its mass per unit volume. The phrase "wave_period_at_variance_spectral_density_maximum", sometimes called peak wave period, describes the period of the most energetic waves within a given sub-domain of the wave spectrum.

surface_sea_water_x_velocity_due_to_tides

under discussion
Proposer: Corinne Derva
Proposed Date: Nov. 13, 2020
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "x" indicates a vector component which is positive when directed eastward (negative westward). Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of the Earth. This rise in water level is accompanied by a horizontal movement of water called the tidal current.

surface_sea_water_y_velocity

under discussion
Proposer: Corinne Derval
Proposed Date: Nov. 13, 2020
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "y" indicates a vector component which is positive when directed northward (negative southward). Ocean currents are related to phenomena of different nature and processes, such as density currents, currents raised by the wind, tide, wave propagation, mass flow in estuaries, etc. This Standard Name refers to the sum of currents of all origins.

surface_sea_water_y_velocity_due_to_tides

under discussion
Proposer: Corinne Derval
Proposed Date: Nov. 13, 2020
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "y" indicates a vector component which is positive when directed northward (negative southward). Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of the Earth. This rise in water level is accompanied by a horizontal movement of water called the tidal current.

surface_sea_water_x_velocity

under discussion
Proposer:
Proposed Date: None
Comments:
Units: m s-1 (UVAA)
New Term
A velocity is a vector quantity. "x" indicates a vector component which is positive when directed eastward (negative westward). Ocean currents are related to phenomena of different nature and processes, such as density currents, currents raised by the wind, tide, wave propagation, mass flow in estuaries, etc. This Standard Name refers to the sum of currents of all origins.

sea_surface_wave_frequency_at_variance_spectral_density_maximum

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Frequency is the number of oscillations of a wave per unit time. The sea_surface_wave_frequency_at_variance_spectral_density_maximum is the frequency of the most energetic waves in the total wave spectrum at a specific location. The wave directional spectrum can be written as a five dimensional function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), f is frequency and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density.

sea_surface_infragravity_wave_significant_height

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Significant wave height is a statistic computed from wave measurements and corresponds to the average height of the highest one third of the waves, where the height is defined as the vertical distance from a wave trough to the following wave crest. Infragravity waves are waves occurring in the frequency range 0.04 to 0.004 s^-1 (wave periods of 25 to 250 seconds).

sea_surface_wave_mean_wavelength_from_variance_spectral_density_inverse_wavenumber_moment

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
The wave directional spectrum can be written as a five dimensional function S(t,x,y,k,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), k is wavenumber and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. Wavenumber is the number of oscillations of a wave per unit distance. Wavenumber moments, M(n) of S1 can then be calculated as follows: M(n) = integral(S1 k^n dk), where k^n is k to the power of n. The inverse wave wavenumber, k(m-1), is calculated as the ratio M(-1)/M(0). The wavelength is the horizontal distance between repeated features on the waveform such as crests, troughs or upward passes through the mean level.

sea_floor_sediment_grain_size

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Units: m (ULAA)
New Term
The average size of grains (also known as particles) in a sediment sample.

sea_ice_floe_diameter

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Units: m (ULAA)
New Term
"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. An ice floe is a flat expanse of sea ice, generally taken to be less than 10 km across. ice_floe_diameter corresponds to the diameter of a circle with the same area as the ice floe.

sea_surface_wave_variance_spectral_density_attenuation_coefficient_due_to_icebergs

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Units: 1 (UUUU)
New Term
The attenuation coefficient is the fractional reduction of sea_surface_wave_variance_spectral_density due to the stated process. Attenuation is the sum of absorption and scattering.

difference_between_sea_surface_temperature_and_air_temperature

under discussion
Proposer: Andy Saulter
Proposed Date: Dec. 21, 2020
Comments:
Units: K (UPKA)
New Term
Sea surface temperature is usually abbreviated as "SST". It is the temperature of sea water near the surface (including the part under sea-ice, if any), not the skin or interface temperature, whose standard names are sea_surface_skin_temperature and surface_temperature, respectively. For the temperature of sea water at a particular depth or layer, a data variable of "sea_water_temperature" with a vertical coordinate axis should be used. Air temperature is the bulk temperature of the air, not the surface (skin) temperature.

ratio_of_sea_water_potential_temperature_anomaly_to_relaxation_timescale

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: K s-1 (KPRS)
Updated term description
The quantity with standard name ratio_of_sea_water_potential_temperature_anomaly_to_relaxation_timescale is a correction term applied to modelled sea water potential temperature. The term is estimated as the deviation of model local sea water potential temperature from an observation-based climatology (e.g. World Ocean Database) weighted by a user-specified relaxation coefficient in s-1 (1/(relaxation timescale)). Potential temperature is the temperature a parcel of air or sea water would have if moved adiabatically to sea level pressure. The phrase "ratio_of_X_to_Y" means X/Y. The term "anomaly" means difference from climatology. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

air_pressure_anomaly

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: Pa (PASX)
Updated term description
The term "anomaly" means difference from climatology. Air pressure is the force per unit area which would be exerted when the moving gas molecules of which the air is composed strike a theoretical surface of any orientation. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

air_temperature_anomaly

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: K (UPKA)
Updated term description
The term "anomaly" means difference from climatology. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

brightness_temperature_anomaly

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: K (UPKA)
Updated term description
The brightness temperature of a body is the temperature of a black body which radiates the same power per unit solid angle per unit area. The term "anomaly" means difference from climatology. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

geopotential_height_anomaly

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: m (ULAA)
Updated term description
The term "anomaly" means difference from climatology. Geopotential is the sum of the specific gravitational potential energy relative to the geoid and the specific centripetal potential energy. Geopotential height is the geopotential divided by the standard acceleration due to gravity. It is numerically similar to the altitude (or geometric height) and not to the quantity with standard name height, which is relative to the surface. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

sea_water_temperature_anomaly

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: K (UPKA)
Updated term description
The term "anomaly" means difference from climatology. Sea water temperature is the in situ temperature of the sea water. To specify the depth at which the temperature anomaly applies, use a vertical coordinate variable or scalar coordinate variable. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

ratio_of_sea_water_practical_salinity_anomaly_to_relaxation_timescale

new
Proposer:
Proposed Date: None
Comments:
CF mailing list link:
Units: s-1 (PRSC)
Updated term description
The quantity with standard name ratio_of_sea_water_practical_salinity_anomaly_to_relaxation_timescale is a correction term applied to modelled sea water practical salinity. The term is estimated as the deviation of model local sea water practical salinity from an observation-based climatology (e.g. World Ocean Database) weighted by a user-specified relaxation coefficient in s-1 (1/(relaxation timescale)). The phrase "ratio_of_X_to_Y" means X/Y. The term "anomaly" means difference from climatology. Practical Salinity, S_P, is a determination of the salinity of sea water, based on its electrical conductance. The measured conductance, corrected for temperature and pressure, is compared to the conductance of a standard potassium chloride solution, producing a value on the Practical Salinity Scale of 1978 (PSS-78). This name should not be used to describe salinity observations made before 1978, or ones not based on conductance measurements. Conversion of Practical Salinity to other precisely defined salinity measures should use the appropriate formulas specified by TEOS-10. Other standard names for precisely defined salinity quantities are sea_water_absolute_salinity (S_A); sea_water_preformed_salinity (S_*), sea_water_reference_salinity (S_R); sea_water_cox_salinity (S_C), used for salinity observations between 1967 and 1977; and sea_water_knudsen_salinity (S_K), used for salinity observations between 1901 and 1966. Salinity quantities that do not match any of the precise definitions should be given the more general standard name of sea_water_salinity. Reference: www.teos-10.org; Lewis, 1980 doi:10.1109/JOE.1980.1145448. To specify the reference (baseline) epoch to which the quantity applies, provide a scalar coordinate variable with standard name reference_epoch.

surface_roughness_length_due_to_vegetation

under discussion
Proposer: Yuling Wu
Proposed Date: Aug. 6, 2020
Comments:
Units: m (ULAA)
New Term
"Vegetation roughness" in fluid dynamics means the surface roughness caused by vegetation in impeding the flow.

lwe_solid_precipitation_rate

under discussion
Proposer: Yuling Wu
Proposed Date: Aug. 6, 2020
Comments:
Units: m s-1 (UVAA)
New Term
"Frozen Precipitation" in the earth's atmosphere means precipitation of water in frozen phase only. The abbreviation "lwe" means liquid water equivalent.

upward_latent_heat_flux_into_air_due_to_transpiration

under discussion
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
Units: W m-2 (UFAA)
New Term
The surface called "surface" means the lower boundary of the atmosphere. "Upward" indicates a vector component which is positive when directed upward (negative downward). The surface latent heat flux is the exchange of heat between the surface and the air, here on account of transpiration. 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. Transpiration is the conversion of fluid into vapor by plants. "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 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. Transpiration is the process by which water is carried from the roots of plants and evaporates from the stomata. Evaporation is the conversion of liquid or solid into vapor. (The conversion of solid alone into vapor is called "sublimation".) Latent heat flux due to transpiration is the exchange of heat between plant surfaces and air due to the evaporation and sublimation of transpired water.

surface_upward_latent_heat_flux_due_to_evaporation

under discussion
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
Units: W m-2 (UFAA)
New Term
The quantity with standard name surface_upward_latent_heat_flux does not include transpiration from vegetation. 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 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. Evaporation is the conversion of liquid or solid into vapor. (The conversion of solid alone into vapor is called "sublimation"). The surface latent heat flux is the exchange of heat between the surface and the air on account of evaporation (including sublimation).

mass_concentration_of_pm10_nitrate_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the nitrate anion is NO3-.

mass_concentration_of_pm10_magnesium_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the magnesium dication is Mg(2+).

mass_concentration_of_pm10_potassium_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the potassium cation is K+.

mass_concentration_of_pm10_calcium_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the calcium dication is Ca(2+).

mass_concentration_of_pm10_sodium_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the sodium cation is Na+.

mass_concentration_of_pm10_methanesulfonic_acid_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for methanesulfonic acid is CH3SO3H.

mass_concentration_of_pm10_oxalate_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the oxalate dianion is C2O4(2-).

mass_concentration_of_pm10_bromide_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the bromide anion is Br-.

mass_concentration_of_pm10_chloride_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for chloride is Cl-.

mass_concentration_of_pm10_ammonium_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for ammonium is NH4.

mass_concentration_of_pm10_sulfate_dry_aerosol_particles_in_air

under discussion
Proposer: Jen Thomas and Christian Tatzelt
Proposed Date: June 29, 2020
Comments: Linked to discussion of "dry_aerosol" in https://github.com/cf-convention/discuss/issues/61.
Units: kg m-3 (UKMC)
New Term
"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". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. "Pm10 aerosol" means atmospheric particulate compounds with an aerodynamic diameter of less than or equal to 10 micrometers. The chemical formula for the sulfate anion is SO4(2-).

lake_mixed_layer_thickness

new
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
CF mailing list link: Standard names: lake variables
Units: m (ULAA)
New Term
The lake mixed layer is the upper part of the ocean, regarded as being well-mixed. Various criteria are used to define the mixed layer; this can be specified by using a standard name of lake_mixed_layer_defined_by_X. "Thickness" means the vertical extent of a layer.

lake_floor_depth_below_lake_surface

new
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
CF mailing list link: Standard names: lake variables
Units: m (ULAA)
New Term
The lake_floor_depth_below_lake_surface is the vertical distance between the lake surface and the lake bed as measured at a given point in space.

lake_water_temperature

new
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
CF mailing list link: Standard names: lake variables
Units: degree (UAAA)
New Term
Lake water temperature is the in situ temperature of the lake water. To specify the depth at which the temperature applies use a vertical coordinate variable or scalar coordinate variable.

lightning_potential_index

under discussion
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
Units: J Kg-1 (JPKG)
New Term
The lightning_potential_index measures the potential for charge generation and separation that leads to lightning flashes in convective thunderstorms. It is derived from the model simulated grid-scale updraft velocity and the mass mixing-ratios of liquid water, cloud ice, snow, and graupel.

lifted_index

under discussion
Proposer: Beate Geyer and Burkhardt Rockel
Proposed Date: Aug. 21, 2020
Comments:
Units: K (UPKA)
New Term
The lifted index, usually abbreviated to LI, is the temperature difference between the environment and an air parcel lifted adiabatically Tp(p) at a given pressure height in the troposphere, usually 500 hPa. When the value is positive, the atmosphere (at the respective height) is stable and when the value is negative, the atmosphere is unstable.

downward_heat_flux_at_snow_base

new
Proposer: Martin Jukes
Proposed Date: May 13, 2020
Comments:
Units: W m-2 (UFAA)
New Term
"Downward" indicates a vector component which is positive when directed downward (negative upward). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.

upward_geothermal_heat_flux_at_ground_level_in_land_ice

new
Proposer: Martin Jukes
Proposed Date: Sept. 30, 2019
Comments:
Units: W m-2 (UFAA)
Updated term description
"Land ice" means glaciers, ice-caps and ice-sheets resting on bedrock and also includes ice-shelves. "ground_level" means the land surface (including beneath snow, ice and surface water, if any). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. "Upward" indicates a vector component which is positive when directed upward (negative downward). The quantity with standard name upward_geothermal_heat_flux_at_ground_level_in_land_ice is the upward heat flux at the interface between the ice and bedrock. It does not include any heat flux from the ocean into an ice shelf.

potential_vorticity_of_atmosphere_layer

new
Proposer: Beate Geyer
Proposed Date: March 11, 2020
Comments:
Units: Pa-1 s-1 (PPPS)
Updated term description
"Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. Atmosphere potential vorticity is the vertically averaged absolute vorticity of a layer of the atmosphere divided by the pressure difference from the bottom to the top of the layer.

surface_shortwave_dust_ambient_aerosol_direct_radiative_effect_assuming_clear_sky

under discussion
Proposer: Martin Juckes
Proposed Date: April 24, 2019
Comments:
Units: W m-2 (UFAA)
Term change from Term: surface_net_downward_shortwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky
The surface called "surface" means the lower boundary of the atmosphere. The term "shortwave" means shortwave radiation. "X_direct_radiative_effect" refers to the instantaneous radiative impact of X on the Earth's energy balance, excluding secondary effects such as changes in cloud cover which may be caused by X. A positive radiative forcing or radiative effect is equivalent to a downward radiative flux and contributes to a warming of the earth system. "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. 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.

surface_longwave_dust_ambient_aerosol_direct_radiative_effect

under discussion
Proposer: Martin Juckes
Proposed Date: April 24, 2019
Comments:
Units: W m-2 (UFAA)
Term change from Term: surface_net_downward_longwave_dust_ambient_aerosol_particles_direct_radiative_effect
The surface called "surface" means the lower boundary of the atmosphere. The term "longwave" means longwave radiation. "X_direct_radiative_effect" refers to the instantaneous radiative impact of X on the Earth's energy balance, excluding secondary effects such as changes in cloud cover which may be caused by X. A positive radiative forcing or radiative effect is equivalent to a downward radiative flux and contributes to a warming of the earth system. "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.

surface_shortwave_dust_ambient_aerosol_direct_radiative_effect

under discussion
Proposer: Martin Juckes
Proposed Date: April 24, 2019
Comments:
Units: W m-2 (UFAA)
Term change from Term: surface_net_downward_shortwave_dust_ambient_aerosol_particles_direct_radiative_effect
The surface called "surface" means the lower boundary of the atmosphere. The term "shortwave" means shortwave radiation. "X_direct_radiative_effect" refers to the instantaneous radiative impact of X on the Earth's energy balance, excluding secondary effects such as changes in cloud cover which may be caused by X. A positive radiative forcing or radiative effect is equivalent to a downward radiative flux and contributes to a warming of the earth system. "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.

surface_longwave_dust_ambient_aerosol_direct_radiative_effect_assuming_clear_sky

under discussion
Proposer: Martin Juckes
Proposed Date: April 24, 2019
Comments:
Units: W m-2 (UFAA)
Term change from Term: surface_net_downward_longwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky
The surface called "surface" means the lower boundary of the atmosphere. The term "longwave" means longwave radiation. "X_direct_radiative_effect" refers to the instantaneous radiative impact of X on the Earth's energy balance, excluding secondary effects such as changes in cloud cover which may be caused by X. A positive radiative forcing or radiative effect is equivalent to a downward radiative flux and contributes to a warming of the earth system. "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. 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.

toa_longwave_dust_ambient_aerosol_direct_radiative_effect_assuming_clear_sky

under discussion
Proposer: Martin Juckes
Proposed Date: April 24, 2019
Comments:
Units: W m-2 (UFAA)
Term change from Term: toa_longwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky
The abbreviation "toa" means top of atmosphere. The term "longwave" means longwave radiation. "X_direct_radiative_effect" refers to the instantaneous radiative impact of X on the Earth's energy balance, excluding secondary effects such as changes in cloud cover which may be caused by X. A positive radiative forcing or radiative effect is equivalent to a downward radiative flux and contributes to a warming of the earth system. "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. 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.

surface_upward_turbulent_heat_flux

under discussion
Proposer: Martin Juckes / Alison Pamment
Proposed Date: July 4, 2018
Comments: Arising from LS3MIP discussion.
Units: W m-2 (UFAA)
Term change from Term: surface_upward_sensible_heat_flux
The surface called "surface" means the lower boundary of the atmosphere. "Upward" indicates a vector component which is positive when directed upward (negative downward). The "turbulent heat flux" is the exchange of heat between the surface and the air by motion of air. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. Unless indicated in the cell_methods attribute, a quantity is assumed to apply to the whole area of each horizontal grid box. Previously, the qualifier "where_type" was used to specify that the quantity applies only to the part of the grid box of the named type. Names containing the where_type qualifier are deprecated and newly created data should use the cell_methods attribute to indicate the horizontal area to which the quantity applies.

upward_turbulent_heat_flux_in_air

under discussion
Proposer: Martin Juckes / Alison Pamment
Proposed Date: July 4, 2018
Comments: Arising from LS3MIP discussion.
Units: W m-2 (UFAA)
Term change from Term: upward_sensible_heat_flux_in_air
"Upward" indicates a vector component which is positive when directed upward (negative downward). The "turbulent heat flux" is the exchange of heat caused by the motion of air. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.

integral_wrt_time_of_surface_downward_turbulent_heat_flux

under discussion
Proposer: Martin Juckes / Alison Pamment
Proposed Date: July 4, 2018
Comments: Arising from LS3MIP discussion.
Units: W s m-2 (WSMM)
Term change from Term: integral_wrt_time_of_surface_downward_sensible_heat_flux
The phrase "integral_wrt_X_of_Y" means int Y dX. The data variable should have an axis for X specifying the limits of the integral as bounds. "wrt" means with respect to. The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a vector component which is positive when directed downward (negative upward). The "turbulent heat flux" is the exchange of heat between the surface and the air by motion of air. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.

surface_downward_turbulent_heat_flux

under discussion
Proposer: Martin Juckes / Alison Pamment
Proposed Date: July 4, 2018
Comments: Arising from LS3MIP discussion.
Units: W m-2 (UFAA)
Term change from Term: surface_downward_sensible_heat_flux
The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a vector component which is positive when directed downward (negative upward). The "turbulent heat flux" is the exchange of heat between the surface and the air by motion of air. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.

isotope_ratio_of_2H_to_1H_in_sea_water_excluding_solutes_and_solids

under discussion
Proposer: Martin Juckes
Proposed Date: April 3, 2018
Comments: CMIP6 - PMIP. 12.
Units: 1 (UUUU)
New Term
The phrase "ratio_of_X_to_Y" means X/Y. The phrase "isotope_ratio" is used in the construction isotope_ratio_of_A_to_B where A and B are both named isotopes. It means the ratio of the number of atoms of A to the number of atoms of B present within a medium. "H" means the element "hydrogen" and "2H" is the stable isotope "hydrogen-2", usually called "deuterium". "1H" is the stable isotope "hydrogen-1". The phrase "in_sea_water_excluding_solutes_and_solids" means that the standard name refers to the composition of the sea water medium itself and does not include material that may be dissolved or suspended in the medium.

atmosphere_mole_content_of_semiheavy_water_vapor

under discussion
Proposer: Maarten Sneep
Proposed Date: Feb. 23, 2018
Comments:
"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 construction "atmosphere_mole_content_of_X" means the vertically integrated number of moles of X above a unit area. The chemical formula for semi-heavy water is HDO, water with one hydrogen replaced by deuterium.

mass_fraction_of_chloride_dry_aerosol_particles_in_air

under discussion
Proposer: Daniel Neumann
Proposed Date: May 18, 2017
Comments:
Units: 1 (UUUU)
New Term
Mass fraction is used in the construction "mass_fraction_of_X_in_Y", where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. The chemical formula for chloride is Cl-.

mass_concentration_of_chloride_dry_aerosol_particles_in_air

under discussion
Proposer: Daniel Neumann
Proposed Date: May 18, 2017
Comments:
Units: kg m-3 (UKMC)
New Term
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 or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. The chemical formula for chloride is Cl-.

vertical_component_of_curl_of_surface_downward_stress

under discussion
Proposer: Bruce Hackett
Proposed Date: Jan. 19, 2016
Comments:
Units: N m-3 (NCUM)
New Term
The surface downward stress is the wind stress on the surface. The quantity with standard name vertical_component_of_curl_of_surface_downward_stress is a signed scalar that represents the magnitude of the 2D surface wind downward stress vector field's local anti-clock-wise rotation at a given point; clockwise rotation is thus given as negative curl. The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a downward flux of momentum, which accelerates the lower medium along the vector and the upper medium against the vector.

divergence_of_surface_downward_stress

under discussion
Proposer: Bruce Hackett
Proposed Date: Jan. 19, 2016
Comments:
Units: N m-3 (NCUM)
New Term
The surface downward stress is the wind stress on the surface. The quantity with standard name divergence_of_surface_downward_stress is a signed scalar that represents the magnitude of the 2D surface wind downward stress vector field's source (positive) or sink (negative) at a given point. The surface called "surface" means the lower boundary of the atmosphere.