Offsetting the radiative benefit of ocean iron fertilization by enhancing N2O emissions

Details Offsetting the radiative benefit of ocean iron fertilization by enhancing N2O emissions Offsetting the radiative benefit of ocean iron fertilization by enhancing N2O emissions

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30xoce3j&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. OCE 3-1, CiteID 2249, DOI 10.1029/2003GL018458

Mathematics

Logic

16

Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Oceanography: Biological And Chemical: Modeling, Oceanography: Biological And Chemical: Carbon Cycling, Oceanography: Biological And Chemical: Chemical Tracers, Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

Ocean iron fertilization is being considered as a strategy for mitigating the buildup of anthropogenic CO2 in the atmosphere. Assessment of this strategy requires consideration of its unintended consequences, such as an enhancement of ocean N2O emissions. This feedback could offset the radiative benefit from the atmospheric CO2 reduction significantly, because N2O is a much more powerful greenhouse gas than CO2 itself. Our model results show that the magnitude of this offsetting effect is substantial, but is highly dependent on the location and duration of fertilization. We find the largest offsets (of the order of 100%) when fertilization is undertaken in the tropics, particularly when it is of limited duration and size. Smaller, but still substantial effects are found when fertilization is undertaken elsewhere and over longer periods. These results suggest that any assessment of ocean fertilization as a mitigating option is incomplete without consideration of the N2O feedback.

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