[CF-metadata] New standard names for NEMO ocean model output

Sebastien Villaume sebastien.villaume at ecmwf.int
Fri Jun 9 01:43:19 MDT 2017


Thank you Alison!

We (Kevin Marsh and myself) are happy with the amended definitions you proposed. 

only one minor tweak in the last sentence of the "steric_change_in_sea_surface_height" definition: I would add "_height" at the end of "steric_change_in_sea_surface". I assume it was intended that way but "_height" got somehow truncated.

Best wishes,
Sébastien

----- Original Message -----
From: "alison pamment" <alison.pamment at stfc.ac.uk>
To: "sebastien villaume" <sebastien.villaume at ecmwf.int>
Cc: cf-metadata at cgd.ucar.edu, "Jonathan Gregory" <j.m.gregory at reading.ac.uk>
Sent: Thursday, 8 June, 2017 15:28:25
Subject: RE: New standard names for NEMO ocean model output

Dear Sebastien,

Thank you for once again bringing this back to the list. I agree that the discussion seems to have settled on the "steric" names rather than the longer versions. We need to have definitions, so I've modified the text I suggested previously.

We now have:
steric_change_in_sea_surface_height (m)
' "Sea surface height" is a time-varying quantity. The steric change in sea surface height is the change in height that a water column of standard temperature T=0°C and practical salinity S=35.0 would undergo when its temperature and salinity are changed to the observed values. The sum of the quantities with standard names thermosteric_change_in_sea_surface_height and halosteric_change_in_sea_surface_height is the total steric change in the water column height, which has the standard name of steric_change_in_sea_surface_height. The sum of the quantities with standard names sea_water_mass_per_unit_area_expressed_as_thickness and steric_change_in_sea_surface is the total thickness of the sea water column.'

halosteric_change_in_sea_surface_height (m)
' "Sea surface height" is a time-varying quantity. The halosteric change in sea surface height is the change in height that a water column of standard practical salinity S=35.0 would undergo when its salinity is changed to the observed value. The sum of the quantities with standard names thermosteric_change_in_sea_surface_height and halosteric_change_in_sea_surface_height is the total steric change in the water column height, which has the standard name of steric_change_in_sea_surface_height.'

thermosteric_change_in_sea_surface_height (m)
' "Sea surface height" is a time-varying quantity. The thermosteric change in sea surface height is the change in height that a water column of standard temperature T=0°C would undergo when its temperature is changed to the observed value. The sum of the quantities with standard names thermosteric_change_in_sea_surface_height and halosteric_change_in_sea_surface_height is the total steric change in the water column height, which has the standard name of steric_change_in_sea_surface_height.'

If you are happy with these then the names can be accepted and added at the next update of the standard name table on 26th June.

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
> Sebastien Villaume
> Sent: 08 June 2017 13:09
> To: Sebastien Villaume
> Cc: cf-metadata at cgd.ucar.edu; Jonathan Gregory
> Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> 
> Dear all,
> 
> since nobody is raising any more issues or showing strong feelings in the
> choice of final standard names, I propose to adopt
> 
> steric_change_in_sea_surface_height
> halosteric_change_in_sea_surface_height
> thermosteric_change_in_sea_surface_height
> 
> 
> We will start producing variables with these standard names in the coming
> weeks.
> 
> thanks,
> /Sébastien
> 
> ----- Original Message -----
> From: "Sebastien Villaume" <sebastien.villaume at ecmwf.int>
> To: "Lowry, Roy K." <rkl at bodc.ac.uk>
> Cc: cf-metadata at cgd.ucar.edu, "Jonathan Gregory"
> <j.m.gregory at reading.ac.uk>
> Sent: Tuesday, 30 May, 2017 09:42:54
> Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> 
> Dear all,
> 
> we would like to start using the remaining 3 standard names for NEMO output.
> We only need to reach a consensus on the standard names we would like to
> have:
> 
> change_in_sea_surface_height_due_to_change_in_sea_water_density
> change_in_sea_surface_height_due_to_change_in_sea_water_practical_salinit
> y
> change_in_sea_surface_height_due_to_change_in_sea_water_temperature
> 
> or
> 
> steric_change_in_sea_surface_height
> halosteric_change_in_sea_surface_height
> thermosteric_change_in_sea_surface_height
> 
> as I mentioned before, I don't have a strong preference, I only need a decision
> so that we can using them.
> 
> thanks,
> /Sébastien
> 
> ----- Original Message -----
> From: "Lowry, Roy K." <rkl at bodc.ac.uk>
> To: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>, "Sebastien Villaume"
> <sebastien.villaume at ecmwf.int>
> Cc: cf-metadata at cgd.ucar.edu
> Sent: Thursday, 27 April, 2017 09:48:42
> Subject: Re: New standard names for NEMO ocean model output
> 
> Dear All,
> 
> 
> My preference (but not insistence) would be for the more compact versions
> providing steric, halosteric and thermosteric are clearly described in the
> definitions. This is cleaner, less confusing, consistent with past practice, more
> likely to be discovered and readily understandable by those who are likely to
> need to use the Standard Names.
> 
> 
> If this is unacceptable to anybody then I'm in total agreement with Jonathan
> that we need to be consistent with existing Standard Names incorporating
> 'sterics', which means including both forms and aliasing them.
> 
> 
> Note that established practice over the past decade has caused 'alias' to come
> to mean 'deprecated and replaced by' rather than 'synonym'. Consequently, if
> going for the option of adding both forms and replacing the existing 'sterics'
> then the 'sterics' need to be the 'deprecates' and the 'due-tos' need to be the
> replacements in all cases.
> 
> 
> 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
> Sebastien Villaume <sebastien.villaume at ecmwf.int>
> Sent: 27 April 2017 09:16
> To: Jonathan Gregory
> Cc: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> 
> Dear all,
> 
> I am not a domain expert, I can't really grasp which set of names is more
> suitable. As a non expert, I would favour the first set because it is more explicit.
> 
> That said, I will follow what the domain experts and/or the standard names
> experts would recommend. Please let us know so we can agree and start using
> these names.
> 
> 
> Best wishes,
> /Sébastien
> 
> ----- Original Message -----
> From: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>
> To: cf-metadata at cgd.ucar.edu
> Sent: Wednesday, 26 April, 2017 22:36:14
> Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> 
> Dear Sebastien
> 
> > @Jonathan: what would be the standard names if we were using
> "_due_to_change_in_" ? Since it is a "change" of height due to a "change" of a
> physical property, we end up with:
> >
> > change_in_sea_surface_height_due_to_change_in_sea_water_density
> >
> change_in_sea_surface_height_due_to_change_in_sea_water_practical_salinit
> y
> > change_in_sea_surface_height_due_to_change_in_sea_water_temperature
> 
> Yes, I agree, that would be right.
> 
> > It is fine for me but I understand it could look awkward to some users/experts.
> It is however nicely verbose to help understand what those parameters are.
> >
> > If we were removing "_above_sea_floor" from the names proposed by Alison:
> >
> > steric_change_in_sea_surface_height
> > halosteric_change_in_sea_surface_height
> > thermosteric_change_in_sea_surface_height
> >
> > it is more compact and elegant but it could be a bit cryptic to non-experts.
> 
> Yes, I agree with this too. As I mentioned, thermosteric and steric do appear
> in existing names (one each), so we should either rename those with due_to, or
> use the steric terms here, for consistency.
> 
> > I am fine with both formulations and I agree with Kevin, we could keep both
> versions and make aliases.
> 
> I am fine too with either of them, but not with aliases for this purpose. We
> use aliases to preserve backwards-compatibility when we change our minds,
> not
> to provide synonyms in the first place.
> 
> Best wishes
> 
> Jonathan
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