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\begin{document}

\title{Trace metal fractional solubility in size-segregated aerosols from the
tropical eastern Atlantic Ocean}



\author[1,1]{Alex R. Baker}%
\author[2,2]{Mingpei Li}%
\author[3,3]{Rosie Chance}%
\affil[1]{University of East Anglia}%
\affil[2]{Newcastle University}%
\affil[3]{University of York}%


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  \date{May 26, 2024}


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\begin{abstract}
Soluble and total trace metals were measured in 4 size fractionated
aerosol samples collected over the tropical eastern Atlantic Ocean. In
samples that were dominated by Saharan dust, the size distributions of
total iron, aluminium, titanium, manganese, cobalt and thorium were very
similar to one another and to the size distributions of soluble
manganese, cobalt and thorium. Finer particle sizes (\textless{}
\textasciitilde{}3 \selectlanguage{greek}µ\selectlanguage{english}m) showed enhanced soluble concentrations of iron,
aluminium and titanium, possibly as a result of interactions with acidic
sulfate aerosol during atmospheric transport. The difference in fine
particle solubility between these two groups of elements might be
related to the hyperbolic increase in the fractional solubility of iron,
and a number of other elements, during the atmospheric transport of
Saharan dust, which is not observed for manganese and its associated
elements. In comparison to elements whose solubility varies during
atmospheric transport, the stability of thorium fractional solubility
should reduce uncertainties in the use of dissolved concentrations of
this element in seawater as a proxy for dust deposition, although this
topic requires further work.%
\end{abstract}%



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