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4. Major progresses of the Indian Ocean ecosystem modeling project:
a)
Iron limitation vs. nutrient limitation ended in August 2010, when we realized that iron limitation only shifted the excess biomass problem to excess nutrient problem. The fundamental issue is to reach nutrient balance in the system.
b) Perfect OMZs were obtained toward the end of 2010. Yu gave an OCN seminar on January 20, 2011. The next step was to finish writing the paper, except for one big hurdle, that is, the ecosystem relied on huge vertical mixing values at mid ocean depth. There is no observational support for such a high mixing regime. This struggle continued until mid March, 2011, when Raleigh (a marine biologist) came up with a new realization that ws/e=constant (ratio of sinking rate and reminerization rate being constant) means we could use 10 times smaller ws and e, and enter a horizontal advection regime (instead of a vertical mixing regime).
c) Now, we are fine tuning the model and are confident for publishing a very good research paper on the OMZs.
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