Dear John, Philip, All,
In my last message I said:
>
> In addition I will modify the definitions of the eleven existing
> primary_production and primary_productivity names to make sure that they
> all use consistent wording as discussed under this thread.
>
In fact, a total of eighteen existing names will be affected by the changes discussed in this thread.
The definitions of six tendency_of_mole_concentration_of_particulate_organic_matter_expressed_as_carbon_in_sea_water_due_to_net_primary_production names need to be slightly modified to ensure all the wording is consistent.
In addition, Philip Cameron-Smith pointed out that "productivity|production_of_carbon" means the same as "productivity|production_of_biomass_expressed_as_carbon (see
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2013/056627.html and
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2013/056965.html). We use the expressed_as terminology in 160 existing atmospheric and oceanic chemistry names. Its definition is: 'The phrase "expressed_as" is used in the construction A_expressed_as_B, where B is a chemical constituent of A. It means that the quantity indicated by the standard name is calculated solely with respect to the B contained in A, neglecting all other chemical constituents of A.' I think it is sensible to make the carbon names consistent with other chemical species and thus standardize on a single and easily recognizable method of referring to a single chemical constituent of a compound substance. As a result the following twelve aliases will be created in the next update of the standard name tabl
e:
gross_primary_productivity_of_carbon -> gross_primary_productivity_of_biomass_expressed_as_carbon
net_primary_productivity_of_carbon -> net_primary_productivity_of_biomass_expressed_as_carbon
net_primary_productivity_of_carbon_accumulated_in_leaves -> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_leaves
net_primary_productivity_of_carbon_accumulated_in_roots -> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_roots
net_primary_productivity_of_carbon_accumulated_in_wood -> net_primary_productivity_of_biomass_expressed_as_carbon_accumulated_in_wood
net_primary_mole_productivity_of_carbon_by_phytoplankton -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_phytoplankton
net_primary_mole_productivity_of_carbon_by_picophytoplankton -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_picophytoplankton
net_primary_mole_productivity_of_carbon_by_calcareous_phytoplankton -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_calcareous_phytoplankton
net_primary_mole_productivity_of_carbon_by_diatoms -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_diatoms
net_primary_mole_productivity_of_carbon_by_diazotrophs -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_diazotrophs
net_primary_mole_productivity_of_carbon_by_miscellaneous_phytoplankton -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_miscellaneous_phytoplankton
net_primary_mole_productivity_of_carbon_due_to_nitrate_utilization -> net_primary_mole_productivity_of_biomass_expressed_as_carbon_due_to_nitrate_utilization
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, 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: 27 November 2013 11:24
> To: cf-metadata at cgd.ucar.edu
> Cc: john.graybeal at marinexplore.com
> Subject: Re: [CF-metadata] new standard name for primary production of
> carbon per unit volume
>
> Dear John,
>
> Thanks for your reply. The name
> net_primary_production_of_biomass_expressed_as_carbon_per_unit_volu
> me_in_sea_water (kg m-3 s-1)
> is accepted for inclusion in the standard name table and will be added at the
> next update.
>
> I have modified the definition as suggested by John and added the usual
> explanatory sentence for 'expressed_as', thus the full definition is now as
> follows:
> ' "Production of carbon" means the production of biomass expressed as the
> mass of carbon which it contains. Net primary production is the excess of
> gross primary production (rate of synthesis of biomass from inorganic
> precursors) by autotrophs ("producers"), for example, photosynthesis in
> plants or phytoplankton, over the rate at which the autotrophs themselves
> respire some of this biomass. In the oceans, carbon production per unit
> volume is often found at a number of depths at a given horizontal location.
> That quantity can then be integrated to calculate production per unit area at
> the location. Standard names for production per unit area use the term
> "productivity". The phrase "expressed_as" is used in the construction
> A_expressed_as_B, where B is a chemical constituent of A. It means that the
> quantity indicated by the standard name is calculated solely with respect to
> the B contained in A, neglecting all other chemical constiuents of A.'
>
> In addition I will modify the definitions of the eleven existing
> primary_production and primary_productivity names to make sure that they
> all use consistent wording as discussed under this thread.
>
> Best wishes,
> Alison
>
> ------
> Alison Pamment Tel: +44 1235 778065
> NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk
> STFC Rutherford Appleton Laboratory
> R25, 2.22
> Harwell Oxford, Didcot, OX11 0QX, U.K.
>
>
>
> > -----Original Message-----
> > From: John Graybeal [mailto:john.graybeal at marinexplore.com]
> > Sent: 26 November 2013 16:23
> > To: Pamment, Alison (STFC,RAL,RALSP)
> > Cc: cf-metadata at cgd.ucar.edu
> > Subject: Re: [CF-metadata] new standard name for primary production of
> > carbon per unit volume
> >
> > Alison, sorry for the delay, This proposal is great, though I suggest
> > wordsmithing the added explanation to be more generic (models as well
> as
> > observations).
> >
> > "In the oceans carbon production is often found for multiple depths in a
> > given horizontal location, giving a production per unit volume. The
> quantity
> > can then be integrated..."
> >
> > Hopefully this is minor enough to not arouse any concerns....
> >
> > john
> >
> > On Nov 5, 2013, at 04:48, alison.pamment at stfc.ac.uk wrote:
> >
> > > Dear John and Roy,
> > >
> > > I think, then, that we are agreed the name should be:
> > >
> >
> net_primary_production_of_biomass_expressed_as_carbon_per_unit_volu
> > me_in_sea_water (kg m-3).
> > >
> > > Sorry if I wasn't clear about the definitions. John is correct that we need
> to
> > distinguish between "productivity" and "production" because they have
> > different implications for the units. "Productivity" has long been defined
> in
> > standard names as meaning "production per unit area" which implies units
> > of m-2. I am not suggesting any change to this. The quantity of
> "production",
> > for example, in existing names such as
> >
> tendency_of_mole_concentration_of_particulate_organic_matter_expresse
> > d_as_carbon_in_sea_water_due_to_net_primary_production_by_diatoms,
> > has not in fact been used to specify "per unit volume". It implies only that
> a
> > quantity of biomass carbon is being produced; the quantity itself may be
> > measured as mass in kg or amount of substance in moles. The "m-3" in the
> > existing names comes from the definition of mole concentration: ' "Mole
> > concentration" means number of moles per unit volume'.
> > >
> > > The upshot of this is that we do need different wording for the
> definitions
> > of production and productivity names. Production names would contain
> the
> > following:
> > > ' "Production of carbon" refers to the production of biomass expressed
> as
> > the mass of carbon which it contains. Net primary production is the
> > > excess of gross primary production (rate of synthesis of biomass from
> > inorganic precursors) by autotrophs ("producers"), for example,
> > photosynthesis in plants or phytoplankton, over the rate at which the
> > autotrophs themselves respire some of this biomass.'
> > >
> > > For productivity names we would add an additional explanatory
> sentence
> > (as already used in standard names definitions):
> > > ' "Production of carbon" refers to the production of biomass expressed
> as
> > the mass of carbon which it contains. Net primary production is the
> > > excess of gross primary production (rate of synthesis of biomass from
> > inorganic precursors) by autotrophs ("producers"), for example,
> > photosynthesis in plants or phytoplankton, over the rate at which the
> > autotrophs themselves respire some of this biomass. "Productivity"
> means
> > production per unit area.'
> > >
> > > All mention of "per unit mass" or "per unit volume" is then removed
> from
> > the definition of production itself, which I think it should be. Also, these
> > definitions would allow standard wording regardless of whether the
> > production is land or ocean based, which was my original intention. I
> would
> > need to go through the eleven existing names to make sure their
> > definitions all follow one or other of the above templates.
> > >
> > > For John's new name we can certainly add some extra explanation to the
> > definition as to how the parameter might be used. Based on Roy's
> > explanation I suggest the following:
> > > ' In the oceans it is usual to measure carbon production per unit volume
> at
> > a number of depths for a given horizontal location. The quantity can then
> be
> > integrated to calculate production per unit area at that location. Standard
> > names for production per unit area use the term "productivity".'
> > >
> > > This would be appended to the earlier text about production.
> > >
> > > All OK? If so, I will include these changes in the next standard name
> table
> > update which is currently in preparation, hopefully to be published this
> > week.
> > >
> > > Best wishes,
> > > Alison
> > >
> > > ------
> > > Alison Pamment Tel: +44 1235 778065
> > > NCAS/British Atmospheric Data Centre Email:
> > alison.pamment at stfc.ac.uk
> > > STFC Rutherford Appleton Laboratory
> > > R25, 2.22
> > > Harwell Oxford, Didcot, OX11 0QX, U.K.
> > >
> > >
> > >> -----Original Message-----
> > >> From: John Graybeal [mailto:john.graybeal at marinexplore.com]
> > >> Sent: 04 November 2013 22:54
> > >> To: Lowry, Roy K.
> > >> Cc: Pamment, Alison (STFC,RAL,RALSP); cf-metadata at cgd.ucar.edu
> > >> Subject: Re: [CF-metadata] new standard name for primary production
> of
> > >> carbon per unit volume
> > >>
> > >> Hi Roy,
> > >>
> > >> The indication I had received from other sources (when I asked them
> why
> > CF
> > >> didn't seem to have any production per unit volume names that I could
> > find)
> > >> was that this parameter was generally measured only at the ocean
> > surface,
> > >> via satellites -- hence per unit area was the common unit. Your
> > explanation
> > >> adds a lot to my understanding -- and maybe should be reflected in the
> > >> descriptions!
> > >>
> > >> Thanks!
> > >>
> > >> John
> > >>
> > >> On Nov 4, 2013, at 14:18, "Lowry, Roy K." <rkl at bodc.ac.uk> wrote:
> > >>
> > >>> Hi John,
> > >>>
> > >>> Production per unit volume is the usual parameter measured in the
> > >> oceans. What is usually done is to measure this at maybe half a dozen
> > >> depths at a given position between the surface and 100m and then
> there
> > is
> > >> an integration procedure that can be done on this dataset to produce a
> > >> single value of production per unit area for that position - I guess with
> > the
> > >> objective of making oceanographic data compatible with terrestrial for
> > >> global aggregates.
> > >>>
> > >>> The tow oceanographic parameters have different dimensionality and
> > >> therefore need to be described by different standard names.
> > >>>
> > >>> Cheers, Roy.
> > >>>
> > >>> ________________________________________
> > >>> From: CF-metadata [cf-metadata-bounces at cgd.ucar.edu] On Behalf
> Of
> > >> John Graybeal [john.graybeal at marinexplore.com]
> > >>> Sent: 04 November 2013 15:55
> > >>> To: alison.pamment at stfc.ac.uk
> > >>> Cc: cf-metadata at cgd.ucar.edu
> > >>> Subject: Re: [CF-metadata] new standard name for primary production
> > of
> > >> carbon per unit volume
> > >>>
> > >>> Hi Alison,
> > >>>
> > >>> First change is fine by me.
> > >>>
> > >>> Second change is fine for _my_ request. I note that most terms to date
> > >> (and all terrestrial terms?) consider productivity per unit area; mine is
> > the
> > >> first, or one of the first, that is per unit volume. (The difference is
> > reflected
> > >> in the units.) The definition of "net primary production" needs to
> either
> > be
> > >> written generically (e.g., "per unit area or volume according to the
> > units"),
> > >> or we'll need two different concepts. (I vaguely recall a notion that
> > >> productivity could be by unit area and production by unit volume, but
> > have
> > >> no personal expertise.)
> > >>>
> > >>> John
> > >>>
> > >>>
> > >>> On Nov 4, 2013, at 01:33, alison.pamment at stfc.ac.uk wrote:
> > >>>
> > >>>> Dear John G.,
> > >>>>
> > >>>> Some time ago you proposed a standard name
> > >> net_primary_production_of_carbon_per_unit_volume_in_sea_water
> > with
> > >> canonical units of kg m-3 s-1.
> > >>>>
> > >>>> The proposal is certainly consistent with the syntax of existing
> > >> productivity_of_carbon names. However, there ensued some
> discussion
> > as
> > >> to whether production|productivity_of_carbon means the same as
> > >> production|productivity_of_biomass_expressed_as_carbon. I think the
> > >> answer to this question is actually 'yes'. The definitions even say '
> > >> "Production of carbon" refers to the production of biomass expressed
> as
> > the
> > >> mass of carbon which it contains.' I think we need to be careful to
> retain
> > the
> > >> terms "productivity" or "production" of carbon as part of the names
> > because
> > >> these are the terms widely used and understood by the land surface
> > >> modellers and ocean biogeochemists. However, in the interests of
> > making
> > >> standard names as standard as possible, I suggest that we should in fact
> > >> insert "expressed_as". For example,
> > >> net_primary_mole_productivity_of_carbon_by_diatoms would become
> > >>
> >
> net_primary_mole_productivity_of_biomass_expressed_as_carbon_by_diat
> > >> oms and your proposed name would be
> > >>> co
> > >>>> me
> > >>
> >
> net_primary_production_of_biomass_expressed_as_carbon_per_unit_volu
> > >> me_in_sea_water. The change would affect eleven existing names.
> > Would
> > >> that be acceptable? Does anyone else object to the change?
> > >>>>
> > >>>> Regarding the definition of the proposed name, I see that you have
> > tried
> > >> to make it consistent with existing net_primary_productivity names.
> > >> Looking through the standard name table I have found that we have
> two
> > >> versions of the wording that have been tailored to land based or ocean
> > >> based photosynthesis, respectively. See, for example, the definition of
> > >> net_primary_mole_productivity_of_carbon_by_diatoms versus that of
> > >> net_primary_productivity_of_carbon_accumulated_in_leaves. I think it
> > >> would be better to settle on a single wording for all
> > >> net_primary_production/productivity names, regardless of where the
> > >> process is taking place, so I suggest the following:
> > >>>> " "Production of carbon" refers to the production of biomass
> expressed
> > >> as the mass of carbon which it contains. Net primary production is the
> > >> excess of gross primary production (rate of synthesis of biomass per
> unit
> > >> volume from inorganic precursors) by autotrophs ("producers"), for
> > >> example, photosynthesis in plants or phytoplankton, over the rate at
> > which
> > >> the autotrophs themselves respire some of this biomass. "
> > >>>>
> > >>>> Is this OK? If so, I will amend the definitions of the existing names to
> > all
> > >> have consistent wording.
> > >>>>
> > >>>> Thanks for your patience,
> > >>>> Alison
> > >>>>
> > >>>> ------
> > >>>> Alison Pamment Tel: +44 1235 778065
> > >>>> NCAS/British Atmospheric Data Centre Email:
> > >> alison.pamment at stfc.ac.uk
> > >>>> STFC Rutherford Appleton Laboratory
> > >>>> R25, 2.22
> > >>>> Harwell Oxford, Didcot, OX11 0QX, U.K.
> > >>>>
> > >>>>
> > >>>>> -----Original Message-----
> > >>>>> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On
> > >> Behalf
> > >>>>> Of John Graybeal
> > >>>>> Sent: 02 July 2013 22:56
> > >>>>> To: CF Metadata List
> > >>>>> Subject: Re: [CF-metadata] new standard name for primary
> > production
> > >> of
> > >>>>> carbon per unit volume
> > >>>>>
> > >>>>> As of June 5 this revised name was requested to go with the
> > previously
> > >>>>> submitted definition:
> > >>>>>
> > >>>>> On Jun 5, 2013, at 11:38, John Graybeal
> <graybeal at marinexplore.com>
> > >>>>> wrote:
> > >>>>>> So I think we have the replacement name of
> > >>>>>>
> net_primary_production_of_carbon_per_unit_volume_in_sea_water
> > >>>>>> pending further thoughts and responses.
> > >>>>>
> > >>>>> There has been some discussion (thank you), but to my knowledge,
> > no
> > >>>>> outstanding requests for changes since that posting.
> > >>>>>
> > >>>>> In the definition below, I've modified bits of that definition to
> match
> > >> the
> > >>>>> new term (production). Is this request approvable at this point?
> > >>>>>
> > >>>>> Name:
> > >> net_primary_production_of_carbon_per_unit_volume_in_sea_water
> > >>>>> Units: kg m-3 s-1
> > >>>>> Definition: Net primary production is the excess of gross primary
> > >> production
> > >>>>> (rate of synthesis of biomass per unit volume from inorganic
> > precursors
> > >> by
> > >>>>> autotrophs, or "producers", especially by photosynthesising plants
> > using
> > >>>>> sunlight for energy) over the rate at which they themselves respire
> > >> some of
> > >>>>> this biomass (plant_respiration, assuming all producers to be
> plants).
> > >>>>> "Production of carbon" refers to the production of biomass
> expressed
> > as
> > >> the
> > >>>>> mass of carbon which it contains.
> > >>>>>
> > >>>>> John
> > >>>>>
> > >>>>> ------------------------------------
> > >>>>> John Graybeal
> > >>>>> Senior Data Manager, Metadata and Semantics
> > >>>>>
> > >>>>> Marinexplore
> > >>>>> 920 Stewart Drive
> > >>>>> Sunnyvale, CA
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> _______________________________________________
> > >>>>> CF-metadata mailing list
> > >>>>> CF-metadata at cgd.ucar.edu
> > >>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> > >>>> --
> > >>
> > >
> > > --
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> > > _______________________________________________
> > > CF-metadata mailing list
> > > CF-metadata at cgd.ucar.edu
> > > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >
> > ------------------------------------
> > John Graybeal
> > Sr. Data Manager, Metadata & Semantics
> >
> > M +1 408 675-5445
> > skype: graybealski
> > Marinexplore
> > 920 Stewart Drive
> > Sunnyvale 94085
> > California, USA
> > www.marinexplore.com
>
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