Roy, I'm happy to use production instead of productivity, if that's the rule.
Should the definition say '"Production" means production per unit volume."?
Jonathan and Roy, adding a reference to sea_water is fine. I could imagine the
same metric in a terrestrial experiment, but this item is marine, so if that's
the preference I'll go with it. The "mass_concentration" and
"moles_per_unit_mass" terms use the expression 'in_sea_water', which seems the
right phrase fit to me.
Philip, adding expressed_as_carbon is present in some patterns, but was not
present in the names of the two examples I was working from
(net/gross_primary_productivity_of_carbon). To this lay person, it indicates
the carbon is being ussed as a proxy, at least in part. ("The productivity was
actually of 4 substances, but we are measuring the carbon expression only.")
Since in this case, the data seemed to be representing actual carbon
productivity, and the provider initially chose
net_primary_productivity_of_carbon as the appropriate term, I want with that.
Of course, I Am Not An Expert, may not understand the nuances, and can not
explain why the existing explanation includes this phrasing.
Jonathan, I think it is not an alias (as I understand aliases) of the terms
that are per unit area, because the units are different. Do I understand
aliases correctly?
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.
John
> From: Jonathan Gregory <[email protected]>
> Subject: [CF-metadata] new standard name for primary productivity of carbon
> per unit volume
> Date: June 5, 2013 7:53:25 AM PDT
> To: <[email protected]>
>
> Dear John
>
> I should think it would be helpful to add per unit volume of *what*? to make
> this clearer.
>
> The existing name could be made an alias of one _per_unit_area if that is
> generally thought to be a good idea.
>
> Besy wishes
>
> Jonathan
> From: "Cameron-smith, Philip" <[email protected]>
> Subject: Re: [CF-metadata] new standard name for primary productivity of
> carbon per unit volume
> Date: June 5, 2013 8:11:53 AM PDT
> To: "'[email protected]'" <[email protected]>,
> "'[email protected]'" <[email protected]>
>
> Hi John,
>
> Would it be appropriate to add _expressed_as_carbon, as indicated in the
> description (which follows an existing CF pattern)?
>
> Best wishes,
>
> Philip
On Jun 5, 2013, at 07:54, "Lowry, Roy K." <[email protected]> wrote:
> Hi John,
>
> I think if you look at the various molar primary productivity standard names
> you'll see that the decision has been made in the past to define
> 'productivity' as 'production per unit area'. It might be less confusing if
> you used
>
> net_primary_production_of_carbon_per_unit_volume
>
> It might also be helpful to constrain this new standard name to the marine
> environment as production per unit volume doesn't fit the terrestrial domain
> as well as production per unit area - say something like:
>
> net_primary_production_of_carbon_per_unit_volume_of_sea_water
>
> Cheers, Roy.
>
> Please note that I now work part-time from Tuesday to Thursday. E-mail
> response on other days is possible but not guaranteed!
>
> -----Original Message-----
> From: CF-metadata [mailto:[email protected]] On Behalf Of John
> Graybeal
> Sent: 05 June 2013 03:07
> To: CF Metadata List
> Subject: [CF-metadata] new standard name for primary productivity of carbon
> per unit volume
>
> I would like to request a CF standard name.
>
> Name: net_primary_productivity_of_carbon_per_unit_volume
> Units: kg m-3 s-1
> Definition: Net primary productivity is the excess of
> gross_primary_producivity (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). "Productivity of carbon" refers to the production of
> biomass expressed as the mass of carbon which it contains.
>
> There is an existing net_primary_productivity_of_carbon, expressed per unit
> area. As we are making a data set available which is integrated over a
> vertical extent, producing values with units to match (i.e., kg m-3 s-1), a
> new standard name is needed.
>
> Note: It appears the definition of net primary productivity may assume the
> value will be measured as per unit area. This probably needs to be corrected.
>
> John
>
>
>
>
>
> ------------------------------------
> John Graybeal
> Senior Data Manager, Metadata and Semantics
>
> T +1 (408) 675-5545
> F +1 (408) 616-1626
> skype: graybealski
>
> Marinexplore
> 920 Stewart Drive
> Sunnyvale, CA
>
>
>
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------------------------------------
John Graybeal
Senior Data Manager, Metadata and Semantics
T +1 (408) 675-5545
F +1 (408) 616-1626
skype: graybealski
Marinexplore
920 Stewart Drive
Sunnyvale, CA
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