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

Jonathan Gregory j.m.gregory at reading.ac.uk
Fri Jun 9 07:19:57 MDT 2017


Dear Sebastien and Alison

Sorry to come back to this late, but in view of a more recent discussion, it's
occurred to me that we should put mean_sea_level rather than sea_surface_height
in these three names. By sea_surface_height we mean its instantaneous level,
but when we speak of steric SL change we're referring to mean sea level. Would
you agree?

Best wishes

Jonathan

----- Forwarded message from Sebastien Villaume <sebastien.villaume at ecmwf.int> -----

> Date: Fri, 9 Jun 2017 07:43:19 +0000
> From: Sebastien Villaume <sebastien.villaume at ecmwf.int>
> To: alison pamment <alison.pamment at stfc.ac.uk>
> CC: cf-metadata at cgd.ucar.edu, Jonathan Gregory <j.m.gregory at reading.ac.uk>,
> 	Kevin Marsh <kevin.marsh at ecmwf.int>
> Subject: Re: New standard names for NEMO ocean model output
> X-Mailer: Zimbra 8.6.0_GA_1200 (ZimbraWebClient - FF50 (Linux)/8.6.0_GA_1200)
> 
> 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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