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Title: Influence of atmospheric processes on the solubility and composition of iron in Saharan dust

Abstract

Aerosol iron was examined in Saharan dust plumes using a combination of iron near-edge X-ray absorption spectroscopy and wet-chemical techniques. Aerosol samples were collected at three sites located in the Mediterranean, the Atlantic, and Bermuda to characterize iron at different atmospheric transport lengths and time scales. Iron(III) oxides were a component of aerosols at all sampling sites and dominated the aerosol iron in Mediterranean samples. In Atlantic samples, iron(II and III) sulfate, iron(III) phosphate, and iron(II) silicates were also contributors to aerosol composition. With increased atmospheric transport time, iron(II) sulfates are found to become more abundant, aerosol iron oxidation state became more reduced, and aerosol acidity increased. As a result, atmospheric processing including acidic reactions and photoreduction likely influence the form of iron minerals and oxidation state in Saharan dust aerosols and contribute to increases in aerosol-iron solubility.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. Florida State Univ., Tallahassee, FL (United States); Institut Univ. Europeen de la Mer, Plouzane (France)
  5. Georgia Inst. of Technology, Atlanta, GA (United States); Foundation for Research and Technology, Patras (Greece); National Observatory of Athens, Penteli (Greece)
  6. National Observatory of Athens, Penteli (Greece); Univ. of Crete, Iraklion (Greece)
  7. Univ. of Crete, Iraklion (Greece)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Science Foundation (NSF); European Union - European Social Fund (ESF); European Union - National Strategic Reference Framework (NSRF) - Education and Lifelong Learning Research Funding Program (ARISTEIA)
OSTI Identifier:
1339565
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 50; Journal Issue: 13; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Longo, Amelia F., Feng, Yan, Lai, Barry, Landing, William M., Shelley, Rachel U., Nenes, Athanasios, Mihalopoulos, Nikolaos, Violaki, Kalliopi, and Ingall, Ellery D. Influence of atmospheric processes on the solubility and composition of iron in Saharan dust. United States: N. p., 2016. Web. doi:10.1021/acs.est.6b02605.
Longo, Amelia F., Feng, Yan, Lai, Barry, Landing, William M., Shelley, Rachel U., Nenes, Athanasios, Mihalopoulos, Nikolaos, Violaki, Kalliopi, & Ingall, Ellery D. Influence of atmospheric processes on the solubility and composition of iron in Saharan dust. United States. doi:10.1021/acs.est.6b02605.
Longo, Amelia F., Feng, Yan, Lai, Barry, Landing, William M., Shelley, Rachel U., Nenes, Athanasios, Mihalopoulos, Nikolaos, Violaki, Kalliopi, and Ingall, Ellery D. Fri . "Influence of atmospheric processes on the solubility and composition of iron in Saharan dust". United States. doi:10.1021/acs.est.6b02605. https://www.osti.gov/servlets/purl/1339565.
@article{osti_1339565,
title = {Influence of atmospheric processes on the solubility and composition of iron in Saharan dust},
author = {Longo, Amelia F. and Feng, Yan and Lai, Barry and Landing, William M. and Shelley, Rachel U. and Nenes, Athanasios and Mihalopoulos, Nikolaos and Violaki, Kalliopi and Ingall, Ellery D.},
abstractNote = {Aerosol iron was examined in Saharan dust plumes using a combination of iron near-edge X-ray absorption spectroscopy and wet-chemical techniques. Aerosol samples were collected at three sites located in the Mediterranean, the Atlantic, and Bermuda to characterize iron at different atmospheric transport lengths and time scales. Iron(III) oxides were a component of aerosols at all sampling sites and dominated the aerosol iron in Mediterranean samples. In Atlantic samples, iron(II and III) sulfate, iron(III) phosphate, and iron(II) silicates were also contributors to aerosol composition. With increased atmospheric transport time, iron(II) sulfates are found to become more abundant, aerosol iron oxidation state became more reduced, and aerosol acidity increased. As a result, atmospheric processing including acidic reactions and photoreduction likely influence the form of iron minerals and oxidation state in Saharan dust aerosols and contribute to increases in aerosol-iron solubility.},
doi = {10.1021/acs.est.6b02605},
journal = {Environmental Science and Technology},
number = 13,
volume = 50,
place = {United States},
year = {2016},
month = {6}
}

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Works referencing / citing this record:

High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom
journal, June 2017

  • Shoenfelt, Elizabeth M.; Sun, Jing; Winckler, Gisela
  • Science Advances, Vol. 3, Issue 6
  • DOI: 10.1126/sciadv.1700314

Soluble iron nutrients in Saharan dust over the central Amazon rainforest
journal, January 2017

  • Rizzolo, Joana A.; Barbosa, Cybelli G. G.; Borillo, Guilherme C.
  • Atmospheric Chemistry and Physics, Vol. 17, Issue 4
  • DOI: 10.5194/acp-17-2673-2017

High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom
journal, June 2017

  • Shoenfelt, Elizabeth M.; Sun, Jing; Winckler, Gisela
  • Science Advances, Vol. 3, Issue 6
  • DOI: 10.1126/sciadv.1700314

Soluble iron nutrients in Saharan dust over the central Amazon rainforest
journal, January 2017

  • Rizzolo, Joana A.; Barbosa, Cybelli G. G.; Borillo, Guilherme C.
  • Atmospheric Chemistry and Physics, Vol. 17, Issue 4
  • DOI: 10.5194/acp-17-2673-2017