Iron speciation in aerosol dust influences iron bioavailability over glacial-interglacial timescales

• Published in: Geophysical research letters Vol. 40; no. 8; pp. 1618 - 1623
• Main Authors: Spolaor, A., Vallelonga, P., Cozzi, G., Gabrieli, J., Varin, C., Kehrwald, N., Zennaro, P., Boutron, C., Barbante, C.
• Format: Journal Article
• Language: English
• Published: Washington Blackwell Publishing Ltd 28-04-2013; John Wiley & Sons, Inc
• Subjects: Aerosols; Atmospheric aerosols; Atmospheric particulates; Bioavailability; Carbon dioxide; Carbon dioxide atmospheric concentrations; Carbon sequestration; Deposition; Drawdown; Dust; Dust storms; Dust transport; Dynamics; Glaciers; Ice cores; Interglacial periods; Iron; Last Glacial Maximum; Mineral nutrients; Oxidation; pH effects; Photochemistry; Photoreduction; Phytoplankton; Plankton; Primary production; Southern Ocean; Speciation; Talos Dome; Uptake; Southern Ocean; Antarctica, East Antarctica, Talos Dome; PS, Antarctic Ocean
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1002/grl.50296

Iron deposition influences primary production and oceanic sequestration of atmospheric carbon dioxide (CO2). Iron has two oxidation states, Fe(II) and Fe(III), with Fe(II) being more soluble and available for oceanic phytoplankton uptake. The past proportions of soluble iron in aerosol dust remain unknown. Here we present iron speciation (Fe2+ and Fe3+) in the Antarctic Talos Dome ice core over millennial time scales. We demonstrate that iron speciation over the last 55 kyr is linked to increasing quantities of fine dust (FD) (0.7–5 µm) and intensified long‐range dust transport. We propose that Fe(II) and Fe2+ production is principally enhanced in FD by photoreduction, although pH and organic complexation may also contribute to the speciation dynamics. During the Last Glacial Maximum, Fe2+ concentrations in dust increased by up to seven times more than interglacial levels, while Fe3+ only doubled. Cold and dusty climatic periods may increase the percentage of biologically available Fe(II) and Fe2+ deposited in the nutrient‐limited Southern Ocean, allowing greater phytoplankton uptake and perhaps increased CO2 drawdown.
Key Points
The first work recording iron speciation in ice core in glacial‐interglacial
Importance of iron species in the bioavailability of iron
It demonstrates that the addition of iron species results in CO2 drawdown