BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-10-6617-2013 Solubility of iron and other trace elements in rainwater collected on the Kerguelen Islands (South Indian Ocean) Heimburger A. 1 Losno R. https://orcid.org/0000-0003-0246-862X 1 Triquet S. 1 Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS UMR7583, Université Paris Diderot, Université Paris Est-Créteil, 94010 Créteil Cedex, France 22 10 2013 10 10 6617 6628 Copyright: © 2013 A. Heimburger et al. 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/10/6617/2013/bg-10-6617-2013.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/10/6617/2013/bg-10-6617-2013.pdf

The soluble fraction of aerosols that is deposited on the open ocean is vital for phytoplankton growth. It is believed that a large proportion of this dissolved fraction is bioavailable for marine biota and thus plays an important role in primary production, especially in HNLC oceanic areas where this production is limited by micronutrient supply. There is still much uncertainty surrounding the solubility of atmospheric particles in global biogeochemical cycles and it is not well understood. In this study, we present the solubilities of seven elements (Al, Ce, Fe, La, Mn, Nd, Ti) in rainwater on the Kerguelen Islands, in the middle of the Southern Indian Ocean. The solubilities of elements exhibit high values, generally greater than 70%, and Ti remains the least soluble element. Because the Southern Indian Ocean is remote from its dust sources, only a fraction of smaller aerosols reaches the Kerguelen Islands after undergoing several cloud and chemical processes during their transport, resulting in a drastic increase in solubility. Finally, we deduced an average soluble iron deposition flux of 27 ± 6 μg m<sup>−2</sup> d<sup>−1</sup> (~0.5 μmol m<sup>−2</sup> d<sup>−1</sup>) for the studied oceanic area, taking into account a median iron solubility of 82% ± 18%.

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