[CF-metadata] New standard name for geostrophic ocean velocities

alison.pamment at stfc.ac.uk alison.pamment at stfc.ac.uk
Tue Feb 7 06:12:49 MST 2017


Dear Elodie,

Thank you for reminding me about the two geostrophic names. I agree that these two are pretty straight forward. At Nan's suggestion, I've expanded slightly on our standard definition text of "geostrophic", bearing in mind that it applies equally to ocean and atmosphere circulation.

So now we have:

geostrophic_eastward_sea_water_velocity (canonical units: m s-1)
'A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). "Geostrophic" indicates that geostrophic balance is assumed, i.e. that the pressure gradient force and the Coriolis force are balanced and the large scale fluid flow is parallel to the isobars.'

geostrophic_northward_sea_water_velocity (canonical units: m s-1)
'A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). "Geostrophic" indicates that geostrophic balance is assumed, i.e. that the pressure gradient force and the Coriolis force are balanced and the large scale fluid flow is parallel to the isobars.'

These two names are accepted for inclusion in the standard name table and will be added in the February update.

There are ten existing "geostrophic" names:
geostrophic_eastward_wind
geostrophic_northward_wind
surface_geostrophic_eastward_sea_water_velocity
surface_geostrophic_eastward_sea_water_velocity_assuming_sea_level_for_geoid
surface_geostrophic_northward_sea_water_velocity
surface_geostrophic_northward_sea_water_velocity_assuming_sea_level_for_geoid
surface_geostrophic_sea_water_x_velocity
surface_geostrophic_sea_water_x_velocity_assuming_sea_level_for_geoid
surface_geostrophic_sea_water_y_velocity
surface_geostrophic_sea_water_y_velocity_assuming_sea_level_for_geoid
The definitions of these names will be updated for consistency with the new text - indeed the wind name definitions don't currently explain geostrophic at all. These changes will also be part of the February update to standard names.

I've been having a look at the wave period proposals and will send a separate posting to the list shortly.

Best wishes,
Alison

------
Alison Pamment                                                       Tel: +44 1235 778065
Centre for Environmental Data Analysis         Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory     
R25, 2.22
Harwell Campus, Didcot, OX11 0QX, U.K.



> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> Elodie Fernandez
> Sent: 02 February 2017 10:05
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] Standard name and area type tables updated
> 
> Dear Alison, dear all,
> 
> Back in September, I suggested the addition of new standard names
> "geostrophic_eastward_sea_water_velocity" and
> "geostrophic_northward_sea_water_velocity" (see
> http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2016/059015.html).
> There have been quite a few updates of the tables since, but those names
> are not included yet. Is there anything I could/should do to get them
> included?
> 
> In April, there were also discussions on the inclusion of wave standard
> names. The height parameters have been included in table v35 in July.
> But the others (mostly period and direction) are still "under
> discussion" on the "CF proposal page". Any news on that topic?
> 
> Regards,
> Elodie
> 
> On 01/02/2017 16:19, alison.pamment at stfc.ac.uk wrote:
> > Dear All,
> >
> > The standard name and area type tables have both been updated. The
> standard name table is now at version 40 and the area type table is at version
> 5, both dated 25 January 2017. The changes to both tables have also been
> published in the NERC Vocabulary Server.
> >
> > The changes are listed below. I have also given details of the changes that
> went into the standard name table at version 39, published in December 2016,
> as I did not send those to the mailing list at the time.
> >
> > Mike Godin, David Lawrence, Sophie Nowicki and Elena Shevliakova have
> been added to the list of contributors to CF standard names:
> http://cfconventions.org/Data/cf-standard-names/docs/standard-name-
> contributors.html.
> >
> > The next update to standard names is planned for 21st February 2017.
> >
> > Best wishes,
> > Alison
> >
> > ---
> >
> > V39 standard name changes:
> >
> > 1. New names
> >
> > a. Proposed by David Lawrence and Elena Shevliakova for the CMIP6 LUMIP
> experiment:
> >
> >
> carbon_mass_flux_into_forestry_and_agricultural_products_due_to_anthropog
> enic_land_use_or_land_cover_change (canonical units: kg m-2 s-1)
> >
> carbon_mass_flux_into_soil_and_litter_due_to_anthropogenic_land_use_or_la
> nd_cover_change (canonical units: kg m-2 s-1)
> > gross_rate_of_decrease_in_area_fraction (canonical units: s-1)
> > gross_rate_of_increase_in_area_fraction (canonical units: s-1)
> > mass_content_of_water_in_soil (canonical units: kg m-2)
> > mass_content_of_water_in_soil_layer (canonical units: kg m-2)
> > surface_downward_mass_flux_of_water_due_to_irrigation (canonical units:
> kg m-2 s-1)
> > surface_upward_heat_flux_due_to_anthropogenic_energy_consumption
> (canonical units: W m-2)
> >
> surface_upward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_
> anthropogenic_land_use_or_land_cover_change (canonical units: kg m-2 s-1)
> >
> tendency_of_atmosphere_mass_content_of_carbon_dioxide_expressed_as_car
> bon_due_to_emission_from_forestry_and_agricultural_products (canonical
> units: kg m-2 s-1)
> >
> > b. Proposed by Paul Durack for the CMIP6 OMIP experiment:
> >
> > mole_concentration_of_dissolved_inorganic_phosphorus_in_sea_water
> (canonical units: mol m-3)
> >
> > 2. Aliases
> >
> > During the discussion of the LUMIP names it was agreed that the phrase
> "forestry and agricultural products" would be used in standard names in
> preference to "products of anthropogenic_land_use_change". This affected one
> existing name which has been updated as follows:
> > carbon_content_of_products_of_anthropogenic_land_use_change (kg m-2) ->
> carbon_content_of_forestry_and_agricultural_products (kg m-2)
> >
> > ---
> >
> > V40 standard name changes:
> >
> > 1. New names
> >
> > a. Proposed by Sophie Nowicki for the CMIP6 ISMIP6 experiment
> >
> > floating_ice_sheet_area_fraction (canonical units: 1)
> > grounded_ice_sheet_area_fraction (canonical units: 1)
> > land_ice_basal_specific_mass_balance_flux (canonical units: kg m-2 s-1)
> > land_ice_basal_upward_velocity (canonical units: m s-1)
> > land_ice_runoff_flux (canonical units: kg m-2 s-1)
> > land_ice_specific_mass_flux_due_to_calving (canonical units: kg m-2 s-1)
> > land_ice_specific_mass_flux_due_to_calving_and_ice_front_melting
> (canonical units: kg m-2 s-1)
> > land_ice_surface_melt_flux (canonical units: kg m-2 s-1)
> > land_ice_surface_upward_velocity (canonical units: m s-1)
> > land_ice_surface_x_velocity (canonical units: m s-1)
> > land_ice_surface_y_velocity (canonical units: m s-1)
> > temperature_at_base_of_ice_sheet_model (canonical units: K)
> > temperature_at_top_of_ice_sheet_model (canonical units: K)
> > tendency_of_land_ice_mass_due_to_basal_mass_balance (canonical units:
> kg s-1)
> > tendency_of_land_ice_mass_due_to_calving (canonical units: kg s-1)
> > upward_geothermal_heat_flux_at_ground_level_in_land_ice (canonical units:
> W m-2)
> > water_flux_into_sea_water_from_land_ice (canonical units: kg m-2 s-1)
> >
> > b. Proposed by Mike Godin
> >
> > mass_concentration_of_petroleum_hydrocarbons_in_sea_water (canonical
> units: kg m-3)
> >
> > 2. Aliases
> >
> > No new aliases were created at version 40 of the standard name table
> >
> > 3. Modifications to definitions of existing names
> >
> > The definition of one existing name,
> land_ice_surface_specific_mass_balance_flux (kg m-2 s-1), was modified to
> make the wording more consistent with that of the new land ice mass balance
> names.
> >
> > ---
> >
> > V5 area type changes:
> >
> > 1. New area types
> >
> > a. Proposed by David Lawrence and Elena Shevliakova for the CMIP6 LUMIP
> experiment
> >
> > primary_and_secondary_land
> > urban
> >
> > b. Proposed by Sophie Nowicki for the CMIP6 ISMIP6 experiment
> >
> > ice_sheet
> > floating_ice_shelf
> > grounded_ice_sheet
> >
> > 2. Modifications to definitions of existing area types
> >
> > a. Proposed by David Lawrence and Elena Shevliakova for the CMIP6 LUMIP
> experiment
> >
> > A second sentence was added to the definition of the area_type 'pastures',
> which now reads 'Pastures are assumed to be anthropogenic in origin. They
> include anthropogenically managed pastureland and rangeland.'
> >
> > ---
> >
> > ------
> > Alison Pamment                                                       Tel: +44 1235 778065
> > Centre for Environmental Data Analysis         Email:
> alison.pamment at stfc.ac.uk
> > STFC Rutherford Appleton Laboratory
> > R25, 2.22
> > Harwell Campus, Didcot, OX11 0QX, U.K.
> >
> >
> > _______________________________________________
> > CF-metadata mailing list
> > CF-metadata at cgd.ucar.edu
> > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >
> 
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