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

International audience 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 1 ppm to sedimentary, dust, and hydrothermal iron input. CO2atm is insensitiv...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Tagliabue, Alessandro, Aumont, Olivier, Bopp, Laurent
Other Authors: Department of Earth Ocean and Ecological Sciences Liverpool, University of Liverpool, Laboratoire de physique des océans (LPO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2014
Subjects:
ocean
biogeochemistry
phytoplankton
iron
carbon
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Southern Ocean
Online Access:https://hal.science/hal-01128894
https://hal.science/hal-01128894/document
https://hal.science/hal-01128894/file/2013GL059059.pdf
https://doi.org/10.1002/2013GL059059
Description
Summary:International audience 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 1 ppm 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 ~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.

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