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Does Iron Fertilization Enhance Carbon Sequestration ?

Does Iron Fertilization Enhance Carbon Sequestration ?. Particle flux results from the Southern Ocean Iron Experiment. aka Export in the Shadow of SoFeX. Ken O. Buesseler, John Andrews, Steve Pike, Glen Crossin, Craig Herbold, Matt Charette, Kenneth Coale, Ken Johnson and the SOFeX Group.

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Does Iron Fertilization Enhance Carbon Sequestration ?

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  1. Does Iron Fertilization Enhance Carbon Sequestration? Particle flux results from the Southern Ocean Iron Experiment aka Export in the Shadow of SoFeX Ken O. Buesseler, John Andrews, Steve Pike, Glen Crossin, Craig Herbold, Matt Charette, Kenneth Coale, Ken Johnson and the SOFeX Group

  2. Thorium-234 Introduction & movie In vs. Out concentration profiles & fluxes Particulate Organic Carbon Export POC/234Th ratios & POC fluxes Conclusions In vs. Out POC flux enhancement - small increases evident Particle transport efficiency changes - enhanced transport “in the shadow of SOFeX”

  3. Thorium-234: the movie Sources: 238U decay Losses: 234Th decay & attachment to sinking particles

  4. SOFeX Southern Patch Thorium-234 Concentration

  5. SOFeX Southern Patch Thorium-234 Flux

  6. SOFeX Southern Patch Thorium-234 Flux

  7. SOFeX Southern Patch Thorium-234 Flux

  8. 234Th/t = (238U - 234Th)  - 234Th flux + V where: 234Th/t = change in 234Th over time;  = 234Th decay rate; V = physical transport (small)

  9. Carbon flux = 234Th flux  [POC/234Th]

  10. SOFeX S-patch particle export summary High resolution time-series thorium-234 data allow us to see small iron induced enhancement in particle flux within upper 50m First time ever observed in So. Ocean Fe expt. In addition, in the “shadow” of SOFeX there is less remineralization 2-3 times larger particle fluxes at 100m In vs. Out Evidence for iron induced changes in particle transport efficiency Subsurface ecosystem changes Some SOFeX flux numbers of interest: Total POC flux of 10-14 mM C m-2d-1 at 100m (AESOPS = 20) C:N:bSi = 1: 0.14 : 0.11 1 ton iron added leads to 1,000 tons POC export at 100m

  11. The Three Ken's Thank you…..

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