Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic

Chance, Rosie, Jickells, Timothy D. and Baker, Alex R. ORCID: https://orcid.org/0000-0002-8365-8953 (2015) Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic. Marine Chemistry, 177 (1). 45–56. ISSN 0304-4203

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Abstract

Total and soluble trace metal concentrations were determined in atmospheric aerosol and rainwater samples collected during seven cruises in the south-east Atlantic. Back trajectories indicated the samples all represented remote marine air masses, consistent with climatological expectations. Aerosol trace metal loadings were similar to previous measurements in clean, marine air masses. Median total Fe, Al, Mn, V, Co and Zn concentrations were 206, 346, 5, 3, 0.7 and 11 pmol m-3 respectively. Solubility was operationally defined as the fraction extractable using a pH4.7 ammonium acetate leach. Median soluble Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb concentrations were 6, 55, 1, 0.7, 0.06, 24, 2, 1, 0.05 and 0.3 pmol m-3 respectively. Large ranges in fractional solubility were observed for all elements except Co; median solubility values for Fe, Al and Mn were below 20% while the median for Zn was 74%. Volume weighted mean rainwater concentrations were 704, 792, 32, 10, 3, 686, 25, 0.02, 0.3 and 10 nmol L-1 for Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb respectively (n = 6). Wet deposition fluxes calculated from these values suggest rain makes a significant contribution to total deposition in the study area for all elements except perhaps Ni.

Item Type:	Article
Uncontrolled Keywords:	aerosols,atmospheric deposition,trace metals,solubility,atlantic ocean,geotraces,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School:	Faculty of Science > School of Environmental Sciences Faculty of Science > School of Natural Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User:	Pure Connector
Date Deposited:	13 Nov 2015 12:00
Last Modified:	13 Apr 2023 13:47
URI:	https://ueaeprints.uea.ac.uk/id/eprint/55181
DOI:	10.1016/j.marchem.2015.06.028

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