Q3:  What is the most pressing uncertainty in biogeochemical modeling?
10 - Controls on remineralization and dissolution in the twilight zone
  4 - Accurate representation of biogeochemically active tracers in physical models
  4 - Predictive ability - the physical/ecosystem sensitivity to climate change
  4 - Role of Southern Ocean
  4 - Role of ocean margins
  3 - Controls on variability in elemental ratios
  3 - Flux measurements for model parameterization
  3 - Assessment of level of model complexity that is both necessary and practical
  3 - Understanding of decoupling between EP and PP
  2 - Incorporation of new data types into models (biomolecular; satellites)
  2 - More robust large-scale data constraints (pCO2, iron, nutrients)
  2 - Bioavailability of iron
  2 - Controls on DOC-POC partitioning
  2 - Inverse modeling estimates
  1 - How to synthesize models
  1 - Competition between phyto. groups
1 - Controls on CaCO3 cycle
1 - Controls on gas exchange
1 - Role of predator-prey interactions
1 - Mechanism of nitrogen fixation