Atmospheric carbon dioxide in a less dusty world
Article first published online: 14 FEB 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 3, February 2006
How to Cite
2006), Atmospheric carbon dioxide in a less dusty world, Geophys. Res. Lett., 33, L03610, doi:10.1029/2005GL025098., , , and (
- Issue published online: 14 FEB 2006
- Article first published online: 14 FEB 2006
- Manuscript Accepted: 29 DEC 2005
- Manuscript Revised: 22 DEC 2005
- Manuscript Received: 31 OCT 2005
 The availability of iron exerts a significant control on primary production and the export of organic matter over large areas of the ocean, especially those far from land sources. We explore the regulation of the global soft tissue pump of carbon and atmospheric CO2 by the atmospheric delivery of iron in a three-dimensional ocean circulation and biogeochemistry model. There is only a small change in atmospheric CO2 when the aeolian iron source is increased several fold but a significant increase in response to a reduction in the aeolian iron source. This strong asymmetry suggests a positive feedback, amplifying an increase in atmospheric CO2 if a warmer world is also less dusty.