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

[Remya]

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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