Hi Jonathan,
With respect to the limitation terms, we currently have the definitations
explained in the "Resolved Comment" column as "Ratio of
realizable miscellaneous other phytoplankton growth rate under low nitrogen
stress to theoretical rate without such limitation"... Is this the scope of
description for which you were looking? Are you suggesting
this description should be the long name instead of the comment?
Cheers, John
On Thu, Sep 29, 2016 at 11:06 AM, Jonathan Gregory <
j.m.gregory at reading.ac.uk> wrote:
> Dear Jim
>
> Thanks for explaining. So "natural" is the opposite of "anthropogenic", in
> a restricted sense. It includes the effect of anthropogenic climate change,
> but not the anthropogenic emissions of CO2. Is that right? I think this is
> potentially confusing in the context of CF, which has to cover a wide
> range of
> applications. It is not hard to imagine people wanting to use natural in
> the
> sense of *completely* unaffected by anthropogenic influence. (Obviously I'm
> not commenting on the terminology used in OMIP - I'm sure that's clear in
> that context.) I wonder if for CF we could think of something more
> explicit.
>
> Actually I'm unclear quite what is meant by due_to_natural_component (in
> several names). Component of what? Could you explain a bit more?
>
> Also, what does sea_water_ph_reported_on_total_scale_due_to_X mean? Is it
> perhaps a *change* in pH?
>
> Best wishes
>
> Jonathan
>
> > For the biogeochemistry in OMIP, we've agreed on using the terms
> > 'abiotic' and 'natural', neither synonyms nor antonyms for our
> > purposes. The OMIP-BGC simulations will be run with 2 parallel
> > simulations (or parallel tracers in the same simulation):
> >
> > * 'natural' means it will be maintained at same the CMIP6
> > preindustrial CO2 level throughout the simulation, while the
> >
> > * 'total' simulation will have varying atmospheric CO2, but the same
> > climate (e.g., forced in the OMIP ocean only run).
> >
> > The difference between the total and natural carbon tracers in the
> > two will give us the anthropogenic carbon. The ocean's natural
> > carbon cycle is considered in OMIP to change with climate change
> > even though its simulated atmospheric CO2 is held constant.
> >
> > Regarding 'abiotic', the natural and the total simulation include
> > both abiotic and biotic processes. To distinguish the two we also
> > include an abiotic carbon tracer. Furthermore, we use a simplified
> > abiotic approach to model C-14 in the ocean, e.g., to provide
> > deep-ocean ventilation ages.
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