Tagliabue A., Aumont Olivier, Bopp L. (2014). The impact of different external sources of iron on the global carbon cycle. Geophysical Research Letters, 41 (3), 920-926. ISSN 0094-8276.
Titre du document
The impact of different external sources of iron on the global carbon cycle
Geophysical Research Letters, 2014,
41 (3), 920-926 ISSN 0094-8276
Variable supply of iron to the ocean is often invoked to explain part of past changes in atmospheric CO2 (CO2atm). Using model simulations, we find that CO2atm is sensitive on the order of 15, 2, and 1ppm to sedimentary, dust, and hydrothermal iron input. CO2atm is insensitive to dust because it is not the major iron input to the Southern Ocean. Modifications to the relative export of Si(OH)(4) to low latitudes are opposite to those predicted previously. Although hydrothermalism is the major control on the iron inventory in similar to 25% of the ocean, it remains restricted to the deep ocean, with minor effects on CO2atm. Nevertheless, uncertainties regarding the iron-binding ligand pool can have significant impacts on CO2atm. Ongoing expansion of iron observations as part of GEOTRACES will be invaluable in refining these results.
