[CF-metadata] standard names under ice velocity of water

Jonathan Gregory j.m.gregory at reading.ac.uk
Fri Jun 9 07:16:44 MDT 2017


Dear Roy, Chris et al.

It's possible that it was intentional, but I would tend to think that it is
more like cut-and-paste as Chris says, because in a previous system (and this
name is very old, I think) we generated the help text automatically, including
certain sentences if certain phrases were present in the name. So I would say
that sea_water in standard names is a medium, and we don't require the text
"water in all phases, including frozen i.e. ice and snow" in the definition.
"sea_water" is a phrase used in many standard names, and it doesn't include
sea_ice.

Best wishes

Jonathan

On Fri, Jun 09, 2017 at 08:54:37AM +0000, Lowry, Roy K. wrote:
> Date: Fri, 9 Jun 2017 08:54:37 +0000
> From: "Lowry, Roy K." <rkl at bodc.ac.uk>
> To: Chris Barker <chris.barker at noaa.gov>, Ute Brönner
>  <Ute.Broenner at sintef.no>
> CC: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>, Morten Omholt
>  Alver <Morten.Alver at sintef.no>, Tor Nordam <Tor.Nordam at sintef.no>,
>  Jonathan Gregory <j.m.gregory at reading.ac.uk>
> Subject: Re: [CF-metadata] standard names under ice velocity of water
> 
> 
> Dear Chris,
> 
> 
> My understanding (based on memory not research of the archives) was that this statement was deliberate to allow a single Standard Name to cover a field that is spatial distribution of the velocity of a water body at the point where it is in contact with the atmosphere whether or not it was frozen. In other words, it can represent the sea-ice velocity for some cells and the surface water velocity for others. Checking the archives to confirm this would be advisable before making any change to the definition.
> 
> 
>  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.
> 
> 
> ________________________________
> From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Chris Barker <chris.barker at noaa.gov>
> Sent: 09 June 2017 00:35
> To: Ute Brönner
> Cc: cf-metadata at cgd.ucar.edu; Morten Omholt Alver; Tor Nordam; Jonathan Gregory
> Subject: Re: [CF-metadata] standard names under ice velocity of water
> 
> On Wed, Jun 7, 2017 at 11:53 PM, Ute Brönner <Ute.Broenner at sintef.no<mailto:Ute.Broenner at sintef.no>> wrote:
> This is a citation of the CF standard
> > The surface called "surface" means the lower boundary of the atmosphere. "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). < (http://cfconventions.org/Data/cf-standard-names/28/build/cf-standard-name-table.html)
> 
> In our model we distinguish between ice velocity and the water velocity under the ice in addition to the (average) water velocity in the upper layer. Guess we would be fine if surface_eastward_sea_water_velocity and surface_northward_sea_water_velocity would not include ice per definition.
> 
> I"d like that too.
> 
> unfortunately, someone put ""Water means water in all phases, including frozen i.e. ice and snow." in that definition at some point -- can we change it now?
> 
> I wonder it was there for a real use case, or if that was a definition of "water" from elsewhere that got cut&pasted in...
> 
> -CHB
> 
> 
> --
> 
> Christopher Barker, Ph.D.
> Oceanographer
> 
> Emergency Response Division
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> 
> Chris.Barker at noaa.gov<mailto:Chris.Barker at noaa.gov>
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