Dear Alison,
I agree with these suggestions.
I think we could consider a the statement of an alias (as in X is an alias of Y, where Y is a valid current term) to be equivalent to a definition of X. As corrections to definitions are allowed, it would make sense to allow corrections to the alias statements (though not to the alias terms themselves),
regards,
Martin
________________________________
From: Pamment, Alison (STFC,RAL,RALSP)
Sent: 04 July 2018 11:44
To: Juckes, Martin (STFC,RAL,RALSP); CF-metadata (cf-metadata at cgd.ucar.edu)
Subject: Re: Standard name table updated
Dear Martin,
I think you are right about these names. The aliases were created in Version 55 so they have only existed for three weeks. Instead of describing them as tendencies in snow and ice amount, we could make them tendencies of atmospheric water vapor:
surface_snow_and_ice_sublimation_flux -> tendency_of_atmosphere_mass_content_of_water_vapor_due_to_sublimation_of_surface_snow_and_ice
surface_snow_sublimation_amount -> tendency_of_atmosphere_mass_content_of_water_vapor_due_to_sublimation_of_surface_snow
These would have the correct sign, i.e., positive when sublimation occurs, and the correct units (kg m-2 s-1). Would that be acceptable?
The name tendency_of_surface_ice_amount_due_to_sublimation has also been in the table for three weeks. If we follow the above scheme it should be tendency_of_atmosphere_mass_content_of_water_vapor_due_to_sublimation_of_surface_ice.
In view of the short time the aliases and the new name have existed, and since they were added to write new data for CMIP6, I am going to suggest that we simply change them. This is an unusual step and if the terms had existed for longer we wouldn't be able to do this, but given the circumstances, I think it is the cleanest way of solving the problem. I think it is the most sensible option for correcting aliases that are actually erroneous. It will also help to avoid repeating the same mistake in the future.
Do you agree with this approach?
Best wishes,
Alison
________________________________________
From: Juckes, Martin (STFC,RAL,RALSP)
Sent: 03 July 2018 13:00:51
To: Pamment, Alison (STFC,RAL,RALSP); CF-metadata (cf-metadata at cgd.ucar.edu)
Subject: Re: Standard name table updated
Dear Alison,
I'm sorry, I think we overlooked a sign inconsistency in the discussion of sublimation fluxes from snow. Aliases were introduced:
surface_snow_and_ice_sublimation_flux -> tendency_of_surface_snow_and_ice_amount_due_to_sublimation
surface_snow_sublimation_amount -> tendency_of_surface_snow_amount_due_to_sublimation
Sublimation fluxes are generally interpreted as being positive when the solid phase converts to vapor, and hence a sublimation flux should correspond to minus the tendency of the amount of the solid phase.
Can we un-alias these terms, or introduce "minus_tendency_" terms and adjust the aliases?
We would also need a "minus_tendency_of_surface_ice_amount_due_to_sublimation" term. In this case "tendency_of_surface_ice_amount_due_to_sublimation" was a new term introduced in response to a requirement for a sublimation flux term ... but it expresses minus the required flux.
regards,
Martin
________________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Alison Pamment - UKRI STFC <alison.pamment at stfc.ac.uk>
Sent: 12 June 2018 13:40:23
To: CF-metadata (cf-metadata at cgd.ucar.edu)
Subject: [CF-metadata] Standard name table updated
Dear All,
The standard name table has been updated. The current version is now Version 55, dated 12 June 2018. The changes have also been published on the NERC Vocabulary Server. All changes are listed at the end of this message.
The next update of the standard name table is planned for 2 July 2018. There are now approximately 50 names that remain to be agreed for CMIP6, plus a small number of new area types. As soon as these are resolved I will begin to address the list of non-CMIP related names that are currently waiting for attention.
Best wishes,
Alison
1. New names
a. Names proposed by Martin Juckes for CMIP6 PMIP
minus_tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_deposition (Canonical units: kg m-2 s-1)
minus_tendency_of_atmosphere_mass_content_of_insoluble_dust_dry_aerosol_particles_due_to_deposition (Canonical units: kg m-2 s-1)
surface_net_downward_longwave_dust_ambient_aerosol_particles_direct_radiative_effect (Canonical units: W m-2)
surface_net_downward_longwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky (Canonical units: W m-2)
surface_net_downward_shortwave_dust_ambient_aerosol_particles_direct_radiative_effect (Canonical units: W m-2)
surface_net_downward_shortwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky (Canonical units: W m-2)
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_deposition (Canonical units: kg m-2 s-1)
toa_longwave_dust_ambient_aerosol_particles_direct_radiative_effect_assuming_clear_sky (Canonical units: W m-2)
b. Names proposed by Martin Juckes for CMIP6 LS3MIP
canopy_snow_amount (Canonical units: kg m-2)
liquid_water_mass_flux_into_soil_due_to_surface_snow_melt (Canonical units: kg m-2 s-1)
mass_content_of_water_in_soil_layer_defined_by_root_depth (Canonical units: kg m-2)
nudging_increment_in_mass_content_of_water_in_soil (Canonical units: kg m-2)
nudging_increment_in_snow_and_ice_amount_on_land (Canonical units: kg m-2)
river_water_volume_transport_into_cell (Canonical units: m3 s-1)
river_water_volume_transport_out_of_cell (Canonical units: m3 s-1)
surface_upward_latent_heat_flux_due_to_sublimation (Canonical units: W m-2)
tendency_of_surface_ice_amount_due_to_sublimation (Canonical units: kg m-2 s-1)
c. Names proposed by Alison Pamment for CMIP6 DAMIP
mole_fraction_of_ox_in_air (Canonical units: 1)
photolysis_rate_of_molecular_oxygen (Canonical units: s-1)
photolysis_rate_of_ozone (Canonical units: s-1)
tendency_of_mole_concentration_of_ox_in_air_due_to_chemical_and_photolytic_production (Canonical units: mol m-3 s-1)
tendency_of_mole_concentration_of_ox_in_air_due_to_chemical_destruction (Canonical units: mol m-3 s-1)
2. New aliases
Two aliases were added in this update to make existing sublimation names consistent with new names agreed for LS3MIP and with other existing names.
surface_snow_and_ice_sublimation_flux -> tendency_of_surface_snow_and_ice_amount_due_to_sublimation
surface_snow_sublimation_amount -> tendency_of_surface_snow_amount_due_to_sublimation
3. Modifications to definitions of existing names
a. A definition of 'boundary layer mixing' was agreed during the discussion of names recently added for CMIP6 DynvarMIP: ' "Boundary layer mixing" means turbulent motions that transport heat, water, momentum and chemical constituents within the atmospheric boundary layer and affect exchanges between the surface and the atmosphere. The atmospheric boundary layer is typically characterised by a well-mixed sub-cloud layer of order 500 metres, and by a more extended conditionally unstable layer with boundary-layer clouds up to 2 km. (Reference: IPCC Third Assessment Report, Working Group 1: The Scientific Basis, 7.2.2.3,
https://www.ipcc.ch/ipccreports/tar/wg1/273.htm).' This has now been added to the definitions of 8 existing boundary layer names:
tendency_of_air_temperature_due_to_boundary_layer_mixing
tendency_of_air_temperature_due_to_stratiform_cloud_and_precipitation_and_boundary_layer_mixing
tendency_of_mass_fraction_of_stratiform_cloud_condensed_water_in_air_due_to_boundary_layer_mixing
tendency_of_mass_fraction_of_stratiform_cloud_ice_in_air_due_to_boundary_layer_mixing
tendency_of_mass_fraction_of_stratiform_cloud_liquid_water_in_air_due_to_boundary_layer_mixing
tendency_of_mass_fraction_of_stratiform_cloud_liquid_water_in_air_due_to_condensation_and_evaporation_from_boundary_layer_mixing
tendency_of_specific_humidity_due_to_boundary_layer_mixing
tendency_of_specific_humidity_due_to_stratiform_cloud_and_precipitation_and_boundary_layer_mixing
b. The definitions of two existing graupel names were updated to include the recently agreed description: 'Graupel consists of heavily rimed snow particles, often called snow pellets; often indistinguishable from very small soft hail except when the size convention that hail must have a diameter greater than 5 mm is adopted. Reference: American Meteorological Society Glossary
http://glossary.ametsoc.org/wiki/Graupel. There are also separate standard names for hail. Standard names for "graupel_and_hail" should be used to describe data produced by models that do not distinguish between hail and graupel.'
mass_fraction_of_graupel_in_air
stratiform_graupel_flux
c. The definition of photolysis_rate_of_ozone_to_1D_oxygen_atom was updated to cross-reference one of the newly added DAMIP names.
d. Typographical errors and omissions were corrected in the definitions of 5 existing names:
litter_mass_content_of_nitrogen
ocean_mixed_layer_thickness_defined_by_temperature
tendency_of_specific_humidity_due_to_stratiform_precipitation
water_volume_transport_into_sea_water_from_rivers
wood_debris_mass_content_of_carbon
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
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Received on Wed Jul 04 2018 - 07:16:56 BST
