The impact of different external sources of iron on the global carbon cycle

Abstract Variable supply of iron to the ocean is often invoked to explain part of past changes in atmospheric CO 2 (CO 2atm ). Using model simulations, we find that CO 2atm is sensitive on the order of 15, 2, and 1 ppm to sedimentary, dust, and hydrothermal iron input. CO 2atm is insensitive to dust... View More