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AGU: Global Biogeochemical Cycles

 

Keywords

  • carbon sequestration
  • iron
  • ocean biogeochemical model

Index Terms

  • Biogeosciences: Biogeochemical cycles, processes, and modeling
  • Biogeosciences: Carbon cycling
  • Biogeosciences: Ecosystems, structure and dynamics
  • Biogeosciences: Trace element cycling

Abstract

GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 20, GB2017, 15 PP., 2006
doi:10.1029/2005GB002591

Globalizing results from ocean in situ iron fertilization studies

O. Aumont

Laboratoire d'Océanographie et de Climatologie: Expérimentation et Approches Numériques, IRD/IPSL, Plouzané, France

L. Bopp

Laboratoire des Sciences du Climat et de l'Environnement, CNRS/IPSL, Gif-sur-Yvette, France

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.

Received 22 July 2005; accepted 10 February 2006; published 14 June 2006.

Citation: Aumont, O., and L. Bopp (2006), Globalizing results from ocean in situ iron fertilization studies, Global Biogeochem. Cycles, 20, GB2017, doi:10.1029/2005GB002591.

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