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Globalizing results from ocean in situ iron fertilization studies

Abstract : [1] Despite the growing number of in situ iron fertilization experiments, the efficiency of such fertilization to sequester atmospheric CO2 remains largely unknown. For the first time, a global ocean biogeochemical model has been evaluated against those experiments and then used to estimate the effect of a long-term and large-scale iron addition on atmospheric CO2. The model reproduces the observed timing and amplitude in chlorophyll, the shift in ecosystem composition, and the pCO2 drawdown; it also proves to be of utility in interpreting the observations. However, a full ocean fertilization during 100 years results in a 33 μatm decrease in atmospheric CO2 , that is 2 to 3 times smaller than found previously.
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Olivier Aumont, Laurent Bopp. Globalizing results from ocean in situ iron fertilization studies. Global Biogeochemical Cycles, American Geophysical Union, 2006, 20 (2), pp.GB2017. ⟨10.1029/2005GB002591⟩. ⟨hal-00138103⟩



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