[MITgcm-support] Issue with nitrate and total phytoplankton biomass in BLING

[Matthew Mazloff]

Hi Remya

For bling with ADVECT_PHYTO I think biomass is the 9th tracer. Is this the issue? What is your 9th tracer? It's important to order data.ptracers correctly. 

I think I need more information about your setup. 

Matt


> On Mar 18, 2022, at 1:08 AM, Remya <remyceas at gmail.com> wrote:
> 
> Dear all,
> 
>                   I am running BLING coupled to the MITgcm model. Among the tracers I am facing issues with simulating nitrate and total biomass correctly. I have defined ADVECT_PHYTO to initialize total phytoplankton biomass as 10th tracer instead of different phytoplankton components (Small, large, diazotrophs). The model is using a fraction of initial biomass to compute three phytoplankton components initially. In the source code bling_bio_nitrogen.F, the total phytoplankton biomass is computed and updated as the sum of three phytoplankton components. Total biomass = small + large + diazotrophs. However the output I am getting for nitrate and biomass is not at all comparable with other datasets. When I computed offline the sum of small, large, diazotrophs, it is not the same as total biomass. Chlorophyll is simulated somewhat correctly. Also changing nitrate concentration does not seem to have much impact on total phytoplankton biomass. Please provide suggestions to improve the model simulation to get better nitrate and biomass. 
> 
> Remya.R
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