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

Jonathan Gregory j.m.gregory at reading.ac.uk
Tue Jun 13 07:59:33 MDT 2017


Dear Alison and Sebastien

I am happy too, with the clarification that it's SSH which is wanted in this
case. Thanks for the discussion.

Although I haven't an immediate use-case, I would say it's very likely that the
corresponding stdnames for mean sea level change will be wanted sometime. They
are quantities which I have often calculated and plotted, for example, but not
yet archived in CF-netCDF files! If we add those quantities to the standard
name table now as well, it might avoid people using the SSH names when really
they mean MSL. That is, I'd propose we also add

thermosteric_change_in_[mean_]sea_level
halosteric_change_in_[mean_]sea_level
steric_change_in_[mean_]sea_level

I put [mean] in brackets because I'm not sure whether we've decided to include
"mean" in MSL names (that's a different discussion). The above quantities are
not global average; we already have global average names.

Best wishes

Jonathan


On Tue, Jun 13, 2017 at 01:22:31PM +0000, Sebastien Villaume wrote:
> Date: Tue, 13 Jun 2017 13:22:31 +0000
> From: Sebastien Villaume <sebastien.villaume at ecmwf.int>
> To: alison pamment <alison.pamment at stfc.ac.uk>
> CC: Jonathan Gregory <j.m.gregory at reading.ac.uk>, cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> X-Mailer: Zimbra 8.6.0_GA_1200 (ZimbraWebClient - FF50
>  (Linux)/8.6.0_GA_1200)
> 
> Dear Alison,
> 
> thank you very much for your thorough search and the time spent on this!
> 
> We are happy with the names and definitions.
> 
> thanks again
> 
> Best wishes,
> /Sébastien
> 
> ----- Original Message -----
> From: "alison pamment" <alison.pamment at stfc.ac.uk>
> To: "sebastien villaume" <sebastien.villaume at ecmwf.int>
> Cc: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>, cf-metadata at cgd.ucar.edu
> Sent: Tuesday, 13 June, 2017 14:03:31
> Subject: RE: [CF-metadata] New standard names for NEMO ocean model output
> 
> Dear Sebastien and Jonathan,
> 
> Thank you for clarifying the definition of the steric_change_in_sea_surface_height names. The only question now is whether to use the word 'steric' to describe the concept.
> 
> I did a brief internet search which turned up lots of links to articles about global sea level change, so I then wondered if 'steric' is only used in oceanography to talk about global and/or long term changes which might mean we shouldn't use it for the NEMO names. However, I then found the following in the AMS glossary which I often turn to as a reference: "Specific-volume anomaly (or anomaly of specific volume; also called steric anomaly; symbol δ.) In oceanography, the excess of the actual specific volume of the seawater at any point in the ocean over the specific volume of seawater of salinity 35 psu and temperature 0°C at the same pressure." (http://glossary.ametsoc.org/wiki/Steric_anomaly) (N.B. "Specific" means per unit mass). This definition sounds exactly like that used in the NEMO quantities - it isn't only a global quantity and doesn't require mean sea level as a baseline.
> 
> Our existing 'steric' names use the term more loosely:
> global_average_steric_sea_level_change
> 'Global average steric sea level change is caused by changes in sea water density due to changes in temperature (thermosteric) and salinity (halosteric). Zero sea level change is an arbitrary level.'
> global_average_thermosteric_sea_level_change
> 'Global average thermosteric sea level change is the part caused by change in density due to change in temperature i.e. thermal expansion. Zero sea level change is an arbitrary level.'
> I don't think this is inconsistent with the new names because of the sentence about an arbitrary zero for the global sea level change. Also, in these names we do say 'sea_level', so here we are definitely talking about the change in mean sea level.
> 
> So, for the NEMO names, I think we should stick with what we had previously agreed (with the typo in the first definition now fixed).
> 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_height 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.'
> 
> For the existing steric names, I think we should add our usual text about 'sea_level' to the definitions:
> global_average_steric_sea_level_change
> 'Global average steric sea level change is caused by changes in sea water density due to changes in temperature (thermosteric) and salinity (halosteric). Zero sea level change is an arbitrary level. "Sea level" means mean sea level.'
> global_average_thermosteric_sea_level_change
> 'Global average thermosteric sea level change is the part caused by change in density due to change in temperature i.e. thermal expansion. Zero sea level change is an arbitrary level. "Sea level" means mean sea level.'
> 
> Is this okay?
> 
> 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: Sebastien Villaume [mailto:sebastien.villaume at ecmwf.int]
> > Sent: 13 June 2017 11:39
> > To: Pamment, Alison (STFC,RAL,RALSP)
> > Cc: Jonathan Gregory; cf-metadata at cgd.ucar.edu
> > Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> > 
> > Dear All,
> > 
> > after discussing with the dataset owner/expert (Eric), he has confirmed to me
> > that all the quantities involved are instantaneous and that sea_surface_height
> > is the correct reference.
> > 
> > The definition given by Alison is correct:
> > 
> > > the sum of
> > > sea_water_mass_per_unit_area_expressed_as_thickness and
> > > steric_change_in_sea_surface were meant to give the total water column
> > > thickness in a given model time step. The steric change measures the
> > > contribution of sea water density to the thickness compared with what it
> > would
> > > be if the same mass of water had standard temperature and salinity
> > 
> > Regarding the choice between verbosity/clarity vs domain expert preferred
> > naming, we are still open but it seemed through the discussion that the domain
> > expert naming was favoured. Our main concern is that we want to use these
> > standard names as soon as possible and want them published in the next
> > release of the table.
> > 
> > 
> > Best Wishes,
> > /Sébastien
> > 
> > ----- Original Message -----
> > From: "alison pamment" <alison.pamment at stfc.ac.uk>
> > To: "alison pamment" <alison.pamment at stfc.ac.uk>, "Jonathan Gregory"
> > <j.m.gregory at reading.ac.uk>, cf-metadata at cgd.ucar.edu
> > Sent: Tuesday, 13 June, 2017 11:03:50
> > Subject: Re: [CF-metadata] New standard names for NEMO ocean model output
> > 
> > Dear Jonathan and Sebastien,
> > 
> > Following on from my last post and looking at the names again, I understand
> > the steric names to mean the contribution of temperature and salinity to the
> > (instantaneous) sea_surface_height. Is that right? If so, then I still don't think
> > we should be referring to mean sea level. In the discussion we did consider the
> > possibility of writing the names as:
> > 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
> > but rejected them as being rather verbose. But are they in fact clearer? The
> > main thing in the end is to avoid ambiguity and possible misinterpretation.
> > What do you think?
> > 
> > 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
> > > alison.pamment at stfc.ac.uk
> > > Sent: 13 June 2017 10:46
> > > To: j.m.gregory at reading.ac.uk; cf-metadata at cgd.ucar.edu
> > > Subject: Re: [CF-metadata] New standard names for NEMO ocean model
> > output
> > >
> > > Dear Jonathan and Sebastien,
> > >
> > > Thank you both for your replies. Jonathan is correct that sea_surface_height
> > > means the instantaneous sea level and that's what I thought was meant by
> > > these names. I thought that the sum of
> > > sea_water_mass_per_unit_area_expressed_as_thickness and
> > > steric_change_in_sea_surface were meant to give the total water column
> > > thickness in a given model time step. The steric change measures the
> > > contribution of sea water density to the thickness compared with what it
> > would
> > > be if the same mass of water had standard temperature and salinity doesn't
> > it?
> > > I hadn't understood the names to mean a comparison to mean sea level, but if
> > > that is the intention then we should change the names as Jonathan suggests.
> > > Sebastien, please can you clarify?
> > >
> > > 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
> > > > Jonathan Gregory
> > > > Sent: 09 June 2017 14:20
> > > > To: cf-metadata at cgd.ucar.edu
> > > > Subject: Re: [CF-metadata] New standard names for NEMO ocean model
> > > output
> > > >
> > > > 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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