Hi Alison,
If the column depth is time-invariant (in this case fixed as the
uppermost 100 m), then the time-derivative of the vertical integral
equals the vertical integral of the time-derivative, so the same name
can be used in either case.
Best regards,
Karl
On 27-Apr-10 11:56 AM, John.Dunne at noaa.gov wrote:
> 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.
>>
>>
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Received on Tue Apr 27 2010 - 17:46:12 BST
