Dear Francesca and Marcelo I think that "velocity" ought to appear in this one: > sea_water_to_direction_at_sea_floor It's the velocity which has a direction.
Best wishes Jonathan ----- Forwarded message from Francesca Eggleton - UKRI STFC <[email protected]> ----- > Date: Mon, 11 Nov 2019 17:29:31 +0000 > From: Francesca Eggleton - UKRI STFC <[email protected]> > To: "[email protected]" <[email protected]> > Subject: [CF-metadata] Suggestion for standard names for bottom current and > due to tides and Stokes drift > > Dear Marcelo, > > > > Thank you for your proposals and apologies for the delay in responding. As > you may have seen in Alison's last email, I will be helping out with the > maintenance of the standard names. > > > > Thank you to Jonathan for comments on these proposals. They all look good and > seem to match what already exists. The two phrases which were suggested as > aliases, I believe to be new terms and have suggested a reason why so please > comment if you agree/disagree. The following text will list each of the > proposals, their units and descriptions (constructed from similar terms to be > in line with standard name descriptions). Please let me know if there are any > comments or further changes to be made. If no comments are made in the next 7 > days, these are likely to be accepted in the next update. > > eastward_sea_water_velocity_at_sea_floor > ms-1 > A velocity is a vector quantity. "Eastward" indicates a vector component > which is positive when directed eastward (negative westward). The velocity at > the sea floor is that adjacent to the ocean bottom, which would be the > deepest grid cell in an ocean model. > > northward_sea_water_velocity_at_sea_floor > ms-1 > A velocity is a vector quantity. "Northward" indicates a vector component > which is positive when directed northward (negative southward). The velocity > at the sea floor is that adjacent to the ocean bottom, which would be the > deepest grid cell in an ocean model. > > sea_water_to_direction_at_sea_floor > degree > The phrase "to_direction" is used in the construction X_to_direction and > indicates the direction towards which the velocity vector of X is headed. The > direction is a bearing in the usual geographical sense, measured positive > clockwise from due north. The direction at the sea floor is that adjacent to > the ocean bottom, which would be the deepest grid cell in an ocean model. > > sea_water_speed_at_sea_floor > ms-1 > Speed is the magnitude of velocity. The speed at the sea floor is that > adjacent to the ocean bottom, which would be the deepest grid cell in an > ocean model. > > eastward_sea_water_velocity_due_to_tides > ms-1 > A velocity is a vector quantity. "Eastward" indicates a vector component > which is positive when directed eastward (negative 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. "Due to tides" > means due to all astronomical gravity changes which manifest as tides. No > distinction is made between different tidal components. > northward_sea_water_velocity_due_to_tides > ms-1 > A velocity is a vector quantity. "Northward" indicates a vector component > which is positive when directed northward (negative 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. "Due to tides" > means due to all astronomical gravity changes which manifest as tides. No > distinction is made between different tidal components. > > sea_water_to_direction_due_to_tides > degree > The phrase "to_direction" is used in the construction X_to_direction and > indicates the direction towards which the velocity vector of X is headed. The > direction is a bearing in the usual geographical sense, measured positive > clockwise from due north. 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. "Due to tides" means due to all astronomical gravity changes > which manifest as tides. No distinction is made between different tidal > components. > > sea_water_speed_due_to_tides > ms-1 > Speed is the magnitude of velocity. 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. "Due to tides" means due to all astronomical gravity > changes which manifest as tides. No distinction is made between different > tidal components. > > The following should not be aliases of > sea_surface_wave_stokes_drift_x_velocity and > sea_surface_wave_stokes_drift_y_velocity, they should be proposed as new > terms. The definition states '"x" indicates a vector component along the grid > x-axis, positive with increasing x.', this has been done on purpose to allow > this term to be used with any type of grid and not limiting it to a lat-lon > grid. The term eastward is defined as '"Eastward" indicates a vector > component which is positive when directed eastward (negative westward)' which > limits this term to being 'zonal' (along a latitudinal circle). > > sea_surface_wave_stokes_drift_eastward_velocity > ms-1 > A velocity is a vector quantity. "Eastward" indicates a vector component > which is positive when directed eastward (negative westward). The Stokes > drift velocity is the average velocity when following a specific fluid parcel > as it travels with the fluid flow. For instance, a particle floating at the > free surface of water waves, experiences a net Stokes drift velocity in the > direction of wave propagation. > > sea_surface_wave_stokes_drift_northward_velocity > ms-1 > A velocity is a vector quantity. "Northward" indicates a vector component > which is positive when directed northward (negative southward). The Stokes > drift velocity is the average velocity when following a specific fluid parcel > as it travels with the fluid flow. For instance, a particle floating at the > free surface of water waves, experiences a net Stokes drift velocity in the > direction of wave propagation. > > > sea_surface_wave_stokes_drift_to_direction > degrees > The Stokes drift velocity is the average velocity when following a specific > fluid parcel as it travels with the fluid flow. For instance, a particle > floating at the free surface of water waves, experiences a net Stokes drift > velocity in the direction of wave propagation. The phrase "to_direction" is > used in the construction X_to_direction and indicates the direction towards > which the velocity vector of X is headed. The direction is a bearing in the > usual geographical sense, measured positive clockwise from due north. > > > sea_surface_wave_stokes_drift_speed > > ms-1 > > The Stokes drift velocity is the average velocity when following a specific > fluid parcel as it travels with the fluid flow. For instance, a particle > floating at the free surface of water waves, experiences a net Stokes drift > velocity in the direction of wave propagation. Speed is the magnitude of > velocity. > > > > Thank you, > > Francesca Eggleton > Graduate Environmental Data Scientist > Normal Working Hours (Mon-Thurs): 9am-5pm (Fri 4:30pm) > RAL Space | R25 | Ext: 6710 > > Centre for Environmental Data Analysis (CEDA) > Science and Technology Facilities Council (STFC) > Rutherford Appleton Laboratory | Harwell Campus > Didcot | OX11 0QX > www.ceda.ac.uk<http://www.ceda.ac.uk/> > > > [cid:[email protected]][cid:[email protected]] > > P Please consider the environment before printing this e-mail > > > > Dear Marcelo > > > > These look fine to me, thanks. Just to be clear - you're *not* proposing > > at_bottom, are you? I agree with you that at_sea_floor would be the right > > phrase to use. > > > > Best wishes > > > > Jonathan > > > > > > Hello, > > > > I would like to suggest the inclusion of standard names for u, v, > > speed and direction for bottom current and due to tides and Stokes > > drift: > > > > An example of model output with bottom velocity is the HYCOM NCODA forecast: > > https://tds.hycom.org/thredds/catalog/GLBv0.08/expt_93.0/data/forecasts/runs/catalog.html?dataset=GLBv0.08/expt_93.0/data/forecasts/runs/FMRC_RUN_2019-10-13T12:00:00Z > > water_u_bottom (m/s) = Eastward Water Velocity = > > eastward_sea_water_velocity_at_bottom > > water_v_bottom (m/s) = Northward Water Velocity = > > northward_sea_water_velocity_at_bottom > > > > based on existing variables: > > sea_water_potential_temperature_at_sea_floor > > sea_water_temperature_at_sea_floor > > sea_water_salinity_at_sea_floor > > sea_water_pressure_at_sea_floor > > > > my suggestion would be: > > eastward_sea_water_velocity_at_sea_floor > > northward_sea_water_velocity_at_sea_floor > > sea_water_to_direction_at_sea_floor > > sea_water_speed_at_sea_floor > > > > An example of model output with currents due to tides and Stokes drift > > is the Mercator Forecast: > > http://marine.copernicus.eu/services-portfolio/access-to-products/?option=com_csw&view=details&product_id=GLOBAL_ANALYSIS_FORECAST_PHY_001_024 > > > > based on existing variables: > > eastward_sea_water_velocity_assuming_no_tide > > northward_sea_water_velocity_assuming_no_tide > > ocean_vertical_momentum_diffusivity_due_to_tides > > ocean_vertical_tracer_diffusivity_due_to_tides > > > > my suggestion would be: > > eastward_sea_water_velocity_due_to_tides > > northward_sea_water_velocity_due_to_tides > > sea_water_to_direction_due_to_tides > > sea_water_speed_due_to_tides > > > > Stokes drift is present in the current CF table with: > > sea_surface_wave_stokes_drift_x_velocity > > sea_surface_wave_stokes_drift_y_velocity > > I think it could help to add > > sea_surface_wave_stokes_drift_eastward_velocity > > sea_surface_wave_stokes_drift_northward_velocity > > as aliases to make it clear it is zonal and meridional currents, and > > not just along the grid X and Y dimensions. > > > > Thank you very much. > > -- > > Marcelo Andrioni > > marceloandrioni at > gmail.com<http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata> > > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ----- End forwarded message ----- _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
