Iron supply to the Southern Ocean mixed layer from below; The … · 2015. 4. 21. · - REcoM2 -...
Transcript of Iron supply to the Southern Ocean mixed layer from below; The … · 2015. 4. 21. · - REcoM2 -...
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Iron supply to the Southern Ocean mixed layer from below; The ocean model effect
V. Schourup-Kristensen, J. Hauck, M. Losch, D. A. Wolf-Gladrow and C. Völker
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Olbers et al. (2012)
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Two identical model runs
- REcoM2 - REcoM2
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Dust
Sediments
The Southern Ocean; and HNLC area
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Physical iron supply
MLD min
MLD max
u
u Up-/downwelling
v
v Vertical eddy diffusion
w
w Horizontal advection
x
x En-/detrainment
N
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Total iron supply from below
20 µmol Fe m-2 yr-1 84 µmol Fe m-2 yr-1
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Surface iron concentrations
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Net primary production
NPP : 3.1 Pg C yr-1 EP : 1.1 Pg C yr-1
NPP : 2.1 Pg C yr-1 EP : 1.2 Pg C yr-1
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Physical iron supply
MLD min
MLD max
u
u Up-/downwelling
v
v Vertical eddy diffusion
w
w Horizontal advection
x
x En-/detrainment
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Seasonal iron supply; Entrainment
Month Month
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Seasonal MLD and ferricline
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Seasonal MLD and ferricline
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Total iron supply from below
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Upwelling of iron
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Total iron supply from below
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Turbulent diffusion
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Seasonal NPP
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Seasonal NPP
21%
79%
Diatoms
Nanophytoplankton 67%
33%
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Conclusion
• The ocean model has a large impact on the biogeochemical results in the Southern Ocean
• It affects: • The vertical iron supply • The phytoplankton species composition • The timing of the spring bloom
• Future scenarios