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Phytoplankton functional groups: |
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Size partitioning |
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Variable stoichiometry |
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Mesoscale nutrient supply |
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Physical and temporal patchiness |
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Twilight zone |
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CaCO3 cycling |
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Mineral ballasting |
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Complex role of iron as a limiting nutrient |
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Transport of organic matter |
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Increased sophistication of satellite algorithms |
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Addition of phytoplankton functional groups |
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Addition of elements |
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Increased realism of physical models |
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Spatial resolution (mesoscale eddies) |
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Temporal variability (El Nino; NAO; PDO) |
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Better physics (Gent-McWilliams; KPP) |
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Distinguishing regions of nitrogen, phosphorus,
silicon and iron limitation |
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Excess density required to sink (Smayda, 1970) |
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Diatoms sink readily (compared to picoplankton) |
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Recently, that CaCO3 is necessary to
sink deeply |
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Sinking SiO2 carries 2.6 % by weight
Org. C. while CaCO3 carries 7 % (Klaas and Archer, in prep.) |
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SiO2 sinks more slowly than CaCO3
(Berelson) |
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SiO2 remineralizes more shallowly
than CaCO3 |
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(ZSiO2 ~1000 m vs. ZCaCO3
~2500 m) |
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Notes