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Re: Biotic HOWTO
- Subject: Re: Biotic HOWTO
- From: email@example.com (Ray Najjar)
- Date: Mon, 1 Feb 1999 16:39:31 -0500 (EST)
Keith, thanks for your comments.
> 1) No special allowance is made for negative tracer concentrations. In the
> current version of our code here, we treat these values as zero.
The problem here is that you can change your phosphate inventory as a result
of this. If you add phosphate (by setting negative PO4 values to zero) then
you should remove it elsewhere, perhaps uniformly throughout the model.
> 2) When the ocean is shallower than the compensation depth, the posted
> code sets the biological source/sink terms to zero. We handle this
> situation by considering the compensation depth to be equal to the ocean
> depth. Note that this requires some modifications to the computations
> related to remineralization at the ocean floor.
This makes sense to me.
> 3) Does a unit conversion need to be performed on po4star? I had inferred
> from the design document that the units of the supplied po4 data is
> umol/kg. But po4star is compared to po4, which is umol/m^3.
Ferial, please confirm, but I think that the PO4 maps are in units of umol/kg.
If so, then the maps should be converted to mol/m^3 (by each modeler) using the
mean surface density of 1024.5 kg/m^3.
> We will have our code completed in the near future and can make the source
> available to the participants of OCMIP. The structure & variable names are
> somewhat different. This may ease incorporation of the code into other
> groups models.
Great! Thanks. Ray