Trace metal fractional solubility in size-segregated aerosols from the tropical eastern Atlantic Ocean

Baker, Alex ORCID:, Li, Mingpei and Chance, Rosie J. (2020) Trace metal fractional solubility in size-segregated aerosols from the tropical eastern Atlantic Ocean. Global Biogeochemical Cycles, 34 (6). ISSN 0886-6236

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Soluble and total trace metals were measured in four 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, aluminum, 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 (< ~3 μm) showed enhanced soluble concentrations of iron, aluminum, 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.

Item Type: Article
Uncontrolled Keywords: dust aerosol,geotraces,solubility,trace elements,global and planetary change,environmental chemistry,environmental science(all),atmospheric science ,/dk/atira/pure/subjectarea/asjc/2300/2306
Faculty \ School: Faculty of Science > School of Environmental Sciences
Faculty of Science > School of Natural Sciences
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
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Depositing User: LivePure Connector
Date Deposited: 05 Jun 2020 00:02
Last Modified: 13 Apr 2023 13:59
DOI: 10.1029/2019GB006510


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