[CF-metadata] CMIP5 ocean biogeochemistry standard names

From: John.Dunne at noaa.gov <John.Dunne>
Date: Tue, 27 Apr 2010 14:56:26 -0400

Hi Alison,

Following the example of the European intercomparison (CARBOCEAN?), the
intent was to have two sets of variables for inorganic C, N, P, Fe, Alk
and Si for a tracer equation integrated over the upper 100m such as:

dtracer/dt = Jtracer + tracer_physics

where:

1) Jtracer = the net biological source sink terms integrated in the
upper 100m in units of mol m2 s-1
2) dtracer = the time rate of change of the tracer(s) integrated in the
upper 100m in units of mol m2 s-1

with the calculation of dtracer allows the back-calculation of the
accumulated role of physical processes on the tracers.

Make sense? - John

----- Original Message -----
From: alison.pamment at stfc.ac.uk
Date: Tuesday, April 27, 2010 8:10 am
Subject: RE: [CF-metadata] CMIP5 ocean biogeochemistry standard names

> Dear John,
>
> I was looking again at the biogeochemistry names in preparation for
> adding them to the CMIP5 output document as accepted standard
> names. I
> am concerned that we may have given the wrong names to some of the
> vertically integrated rates of change in the top 100m of the ocean.
> Please can you advise on the definitions. Currently the names are
> listed as:
>
> tendency_of_ocean_mole_content_of_dissolved_inorganic_carbon
> tendency_of_ocean_mole_content_of_dissolved_inorganic_nitrogen
> tendency_of_ocean_mole_content_of_dissolved_inorganic_phosphorus
> tendency_of_ocean_mole_content_of_dissolved_inorganic_iron
> tendency_of_ocean_mole_content_of_dissolved_inorganic_silicon
> integral_wrt_depth_of_tendency_of_sea_water_alkalinity_expressed_as_mole
> _equivalent
> tendency_of_ocean_mole_content_of_dissolved_inorganic_carbon_due_to_biol
> ogical_processes
> tendency_of_ocean_mole_content_of_dissolved_inorganic_nitrogen_due_to_bi
> ological_processes
> tendency_of_ocean_mole_content_of_dissolved_inorganic_phosphorus_due_to_
> biological_processes
> tendency_of_ocean_mole_content_of_dissolved_inorganic_iron_due_to_biolog
> ical_processes
> tendency_of_ocean_mole_content_of_dissolved_inorganic_silicon_due_to_bio
> logical_processes
> integral_wrt_depth_of_tendency_of_sea_water_alkalinity_expressed_as_mole
> _equivalent_due_to_biological_processes
>
> The first two names are defined as follows:
> tendency_of_ocean_mole_content_of_dissolved_inorganic_nitrogen
> 'Net time rate of change of dissolved inorganic carbon in upper 100m'
> and
> tendency_of_ocean_mole_content_of_dissolved_inorganic_phosphorus
> 'Net time rate of change of nitrogen nutrients (e.g. NO3+NH4) in upper
> 100m'.
> If these quantities should be interpreted as the time rate of
> change of
> the vertically integrated mole_concentration, then these names are
> correct.
>
> However, the remainder of the names have definitions along the
> lines of:
> tendency_of_ocean_mole_content_of_dissolved_inorganic_phosphorus
> 'Vertical integral of net time rate of change of phosphate in upper
> 100m',
> which is clearly the vertical integral of the rate of change and
> not the
> rate of change of the vertical integral. I don't think those two
> thingsare identical, are they?
>
> If the order of the calculation is important then I think we should
> adopt the pattern used in the alkalinity names for all these names,
> i.e.,
> integral_wrt_depth_of_tendency_of_mole_concentration_of_dissolved_inorga
> nic_phosphorus_in_sea_water, etc. Do you agree?
>
> Best wishes,
> Alison
>
> ------
> Alison Pamment Tel: +44 1235 778065
> NCAS/British Atmospheric Data Centre Fax: +44 1235 446314
> Rutherford Appleton Laboratory Email:
> alison.pamment at stfc.ac.ukChilton, Didcot, OX11 0QX, U.K.
>
>
> --
> Scanned by iCritical.
>
Received on Tue Apr 27 2010 - 12:56:26 BST