Dear Ute,
There is a precedent in CF for not giving separate Standard Names to a single geophysical variable solely on the basis of its spatial distribution, the classic example being air temperature where the meteorological standard measurement '2m air temperature' has not been given its own Standard Name.
I am also strongly against separate Standard Names for 'surface' unless they represent unique phenomena as has been argued for sea temperature and sea surface velocity.
To me assigning separate Standard Names to currents in the top x metres of water that happens to be under ice sets a very dangerous precedent. If you decide to add extra water body layers to your model - say 10-50m, and 50-100m would you want different Standard Names for the currents in each of these?
I can see two possible solutions to your problem of semantically differentiating the two water body layers in your model.
1) Use the long name parameter attribute
2) Include a z co-ordinate variable to describe each layer
A third option would be to do both (1) and (2).
Cheers, Roy.
Please note that I partially retired on 01/11/2015. I am now only working 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my day in the office. All vocabulary queries should be sent to enquiries at bodc.ac.uk. Please also use this e-mail if your requirement is urgent.
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From: Ute Br?nner <Ute.Broenner at sintef.no>
Sent: 31 May 2017 08:24
To: Lowry, Roy K.; cf-metadata at cgd.ucar.edu
Cc: Petter R?nningen; Morten Omholt Alver; Tor Nordam
Subject: RE: [CF-metadata] standard names under ice velocity of water
Dear Roy,
I think it's because of the fact that in the upper layer (10m or so) we may have all four of them :
1) surface_eastward_sea_water_velocity and surface_northward_sea_water_velocity for water AND ice
This is already a standard name with the definition that >"Water" means water in all phases"< so we can't use it for water only.
2) eastward_sea_ice_velocity and northward_sea_ice_velocity is the one we use for the ice only
and
3) underice_eastward_sea_water_velocity and underice_northward_sea_water_velocity we propose for the water under the ice which is different from
4) eastward_sea_water_velocity and northward_sea_water_velocity which we use for the water body that is not at the surface (as the layer has several meters).
We use the data for modelling of substances at the surface in the ice, so the separation of these data is important to us.
With kind regards / med vennlig hilsen,
Ute
Ute Br?nner
Research Scientist & Senior Project Manager
Direct phone (+47) 998 98 987
P Consider the environment before printing. Less print-outs, more trees, better planet.
From: Lowry, Roy K. [mailto:rkl at bodc.ac.uk]
Sent: 30 May 2017 17:50
To: Ute Br?nner <Ute.Broenner at sintef.no>; cf-metadata at cgd.ucar.edu
Cc: Petter R?nningen <Petter.Ronningen at sintef.no>; Morten Omholt Alver <Morten.Alver at sintef.no>; Tor Nordam <Tor.Nordam at sintef.no>
Subject: Re: [CF-metadata] standard names under ice velocity of water
Dear Ute,
I would prefer the same Standard Name for the currents in a body of water whether or not it is covered by ice. What happens if you have a full year of data from a position where there is only ice for part of the year? Would you have a change of Standard Name for the water body currents when the ice melts?
So, why not use 'eastward_sea_water_velocity' and 'northward_sea_water_velocity'?
Cheers, Roy.
Please note that I partially retired on 01/11/2015. I am now only working 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my day in the office. All vocabulary queries should be sent to enquiries at bodc.ac.uk<mailto:enquiries at bodc.ac.uk>. Please also use this e-mail if your requirement is urgent.
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu<mailto:cf-metadata-bounces at cgd.ucar.edu>> on behalf of Ute Br?nner <Ute.Broenner at sintef.no<mailto:Ute.Broenner at sintef.no>>
Sent: 30 May 2017 15:39
To: cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Cc: Petter R?nningen; Morten Omholt Alver; Tor Nordam
Subject: [CF-metadata] standard names under ice velocity of water
Hei from Norway!
Our institute produces metocean data including currents and ice with the variables
eastward_sea_ice_velocity and northward_sea_ice_velocity
surface_eastward_sea_water_velocity and surface_northward_sea_water_velocity
The latter include the velocity of water and ice together:
"Water" means water in all phases, including frozen i.e. ice and snow. A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward).
We are also storing the velocity of water under the ice (which one could assume as the difference of the two above, slightly more complicated I think). What would be the standard name for that velocity? If there isn't any yet, may we propose
underice_eastward_sea_water_velocity and underice_northward_sea_water_velocity?
With kind regards / med vennlig hilsen,
Ute
Ute Br?nner
Research Scientist & Senior Project Manager
SINTEF Ocean
Environmental Technology, Monitoring and Modelling
www.sintef.no/DREAM<
http://www.sintef.no/DREAM>, www.sintef.no/OSCAR<
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Direct phone (+47) 998 98 987
Visiting: Bratt?rkaia 17C
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