Iron solubility in crustal and anthropogenic aerosols: The Eastern Mediterranean as a case study

M. J.M. Séguret, M. Koçak, C. Theodosi, S. J. Ussher, P. J. Worsfold, B. Herut, N. Mihalopoulos, N. Kubilay, M. Nimmo

Research output: Contribution to journalArticlepeer-review

Abstract

We report seawater dissolution experiments for aerosol samples simultaneously collected (October 2007) across the Levantine Basin (LB, Eastern Mediterranean Sea), a marine system influenced by seasonal atmospheric inputs. Two distinct populations exhibited contrasting kinetic profiles; those representative of strong Saharan dust events which had variable iron release profiles with a maximum solubility of 0.94±1.48% (1 s.d.) whereas those which had a relatively greater anthropogenic influence had consistent profiles (fast release, ≤2 h, of dissolved iron in seawater followed by removal) with a maximum solubility of 11.5±9.3% (1 s.d.). First estimates of atmospheric fluxes of soluble iron are presented, ranging from 8.64±10.76mgm-2y-1 for the Northern LB to 6.48±7.78mgm-2y-1 for the Southern LB. Estimates of Fe fluxes to oceanic basins are important for constraining the global iron budget, and dust dissolution kinetic profiles provide information on the mechanisms involved during the release of aerosol Fe in seawater post atmospheric deposition.

Original languageEnglish
Pages (from-to)229-238
Number of pages10
JournalMarine Chemistry
Volume126
Issue number1-4
DOIs
StatePublished - 20 Sep 2011
Externally publishedYes

Bibliographical note

Funding Information:
We gratefully acknowledge Dr M. Rijkenberg and Prof E. Achterberg for the collection of the seawater and the determination of total Fe complexing ligands. We gratefully acknowledge the two anonymous reviewers for their critical comments and suggestions. The authors acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website ( http://www.arl.noaa.gov/ready.html ) used in this publication. This work was supported by NATO (NATO CLG 982862 ).

Keywords

  • Aerosol iron
  • Dissolution
  • FI-CL
  • Kinetic
  • Levantine Basin

ASJC Scopus subject areas

  • Oceanography
  • Chemistry (all)
  • Environmental Chemistry
  • Water Science and Technology

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