Thanks, Alison! In my view these are much clearer and more precise.
best,
Karl
On 3/29/18 7:21 AM, alison.pamm...@stfc.ac.uk wrote:
Dear Karl, All,
No further comments have been received so the following aliases are now
accepted for publication in the standard name table (next update scheduled for
April 16th).
surface_litter_carbon_content becomes
surface_litter_mass_content_of_carbon (kg m-2)
' "Litter" is dead plant material in or above the soil. It is distinct from coarse wood debris. The precise distinction
between "fine" and "coarse" is model dependent. "Surface litter" means the part of the litter
resting above the soil surface. "Content" indicates a quantity per unit area. The sum of the quantities with standard
names surface_litter_mass_content_of_carbon and subsurface_litter_mass_content_of_carbon has the standard name
litter_mass_content_of_carbon.'
subsurface_litter_carbon_content becomes
subsurface_litter_mass_content_of_carbon (kg m-2)
' "Litter" is dead plant material in or above the soil. It is distinct from coarse wood debris. The precise
distinction between "fine" and "coarse" is model dependent. "Subsurface litter" means the part of
the litter mixed within the soil below the surface. "Content" indicates a quantity per unit area. The sum of the
quantities with standard names surface_litter_mass_content_of_carbon and subsurface_litter_mass_content_of_carbon has the
standard name litter_mass_content_of_carbon.'
litter_carbon_content becomes
litter_mass_content_of_carbon (kg m-2)
' "Litter" is dead plant material in or above the soil. It is distinct from coarse wood debris. The precise
distinction between "fine" and "coarse" is model dependent. "Content" indicates a
quantity per unit area. The sum of the quantities with standard names surface_litter_mass_content_of_carbon and
subsurface_litter_mass_content_of_carbon has the standard name litter_mass_content_of_carbon.'
litter_carbon_flux becomes
mass_flux_of_carbon_into_litter_from_vegetation (kg m-2 s-1)
' "Litter" is dead plant material in or above the soil. It is distinct from coarse wood debris. The precise distinction
between "fine" and "coarse" is model dependent. In accordance with common usage in geophysical disciplines,
"flux" implies per unit area, called "flux density" in physics.'
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamm...@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-boun...@cgd.ucar.edu] On Behalf Of
alison.pamm...@stfc.ac.uk
Sent: 19 March 2018 14:25
To: taylo...@llnl.gov; cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] two standard names for same quantity?
Dear Karl,
Thank you for getting back to me. Unless any objections are received within the
next seven days these changes will be accepted for inclusion in the standard
name table.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
-----Original Message-----
From: Karl Taylor [mailto:taylo...@llnl.gov]
Sent: 15 March 2018 23:58
To: Pamment, Alison (STFC,RAL,RALSP) <alison.pamm...@stfc.ac.uk>;
cf-metadata@cgd.ucar.edu
Cc: chris.d.jo...@metoffice.gov.uk
Subject: Re: [CF-metadata] two standard names for same quantity?
Hi Alison,
I'm not really qualified to provide expert guidance in this area, but from an
outsider's perspective:
I think your proposed modifications (for making these names a bit more
explicit) would be helpful to someone like me.
best regards,
Karl
On 3/13/18 9:50 AM, alison.pamm...@stfc.ac.uk wrote:
Dear Karl, All,
Apologies for taking a while to look at these names. Yes, there is a difference
between the two names subsurface_litter_carbon_content and
surface_litter_carbon_content.
Most litter name definitions contain the sentence ' "Litter" is dead plant material in or
above the soil' which I think I originally adapted from the "litter carbon" description
of these two quite old names. I understand surface_litter_carbon_content to mean the carbon content
of litter lying above the soil surface whereas subsurface_litter_carbon_content pertains to litter
buried within the soil. The sum of the two would be the quantity with the standard name
litter_carbon_content. The definitions of all three names should be updated. Furthermore, they
should really be mass_content names like the new ones we have just introduced for C4MIP, e.g.
litter_mass_content_of_13C.
I suggest we introduce aliases as follows:
surface_litter_carbon_content becomes
surface_litter_mass_content_of_carbon (kg m-2) ' "Litter" is dead plant material in or above the
soil. "Surface litter" means the part of the litter resting above the soil surface.
"Content" indicates a quantity per unit area. The sum of the quantities with standard names
surface_litter_mass_content_of_carbon and subsurface_litter_mass_content_of_carbon has the standard name
litter_mass_content_of_carbon.'
subsurface_litter_carbon_content becomes
subsurface_litter_mass_content_of_carbon (kg m-2) ' "Litter" is dead plant material in or above the
soil. "Subsurface litter" means the part of the litter mixed within the soil below the surface.
"Content" indicates a quantity per unit area. The sum of the quantities with standard names
surface_litter_mass_content_of_carbon and subsurface_litter_mass_content_of_carbon has the standard name
litter_mass_content_of_carbon.'
litter_carbon_content becomes litter_mass_content_of_carbon (kg m-2) '
"Litter" is dead plant material in or above the soil. "Content" indicates a
quantity per unit area. The sum of the quantities with standard names
surface_litter_mass_content_of_carbon and subsurface_litter_mass_content_of_carbon has the standard
name litter_mass_content_of_carbon.'
Are these okay?
While we're looking at these I think we should also update the existing name litter_carbon_flux, defined as '
"Litter carbon" is dead inorganic material in or above the soil quantified as the mass of carbon
which it contains. The litter carbon flux is the rate of production of litter. In accordance with common
usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in
physics.' Fortunately the definition does make it clear that it's a flux into the litter, but the name itself
is rather uninformative. Also, if the litter is dead plant material, then presumably the flux is from
vegetation to litter. So I'd suggest updating this to be more similar to the new C4MIP names:
litter_carbon_flux becomes mass_flux_of
_carbon_into_litter_from_vegetation (kg m-2 s-1) ' "Litter" is dead plant material in or above the
soil. In accordance with common usage in geophysical disciplines, "flux" implies per unit area,
called "flux density" in physics.'
That would make this one the sum of Chris's new C4MIP names
mass_flux_of_carbon_into_litter_from_vegetation_due_to_mortality and
mass_flux_of_carbon_into_litter_from_vegetation_due_to_senescence wouldn't it?
Do others agree?
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival Email: alison.pamm...@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-boun...@cgd.ucar.edu] On Behalf
Of Karl Taylor
Sent: 03 February 2018 06:42
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] two standard names for same quantity?
I noticed that "subsurface_litter_carbon_content" has the same "definition" as
"surface_litter_carbon_content": "Content" indicates a quantity per unit area. "Litter carbon" is dead plant
material in or above the soil quantified as the mass of carbon which it contains. The surface called "surface" means the lower
boundary of the atmosphere.
Is there a difference or are these two names aliases for the same quantity?
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