Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Global Biogeochemical Cycles art. no. GB2017 - NIL_32-NIL_46 MONDE 2006 PAR00001000 ENG Global Biogeochemical Cycles 0886-6236 CC:0002385702-0002 2 10.1029/2005GB002591 https://www.documentation.ird.fr/hor/PAR00001000 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-09/010078685.pdf 20 Horizon (IRD) 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 pCO(2) drawdown; it also proves to be of utility in interpreting the observations. However, a full ocean fertilization during 100 years results in a 33 mu atm decrease in atmospheric CO2, that is 2 to 3 times smaller than found previously. 032 ; 066 ; 064