Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula
The iron (Fe) speciation and oxidation state have been considered critical factors affecting Fe solubility in the atmosphere and bioavailability in the surface ocean. In this study, elemental composition and Fe speciation in aerosol samples collected at the Palmer Station in the West Antarctic Penin...
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ftosti:oai:osti.gov:1880982 2023-07-30T03:58:48+02:00 Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula Fan, Songyun Gao, Yuan Lai, Barry Elzinga, Evert J. Yu, Shun 2023-02-16 application/pdf http://www.osti.gov/servlets/purl/1880982 https://www.osti.gov/biblio/1880982 https://doi.org/10.1016/j.scitotenv.2022.153890 unknown http://www.osti.gov/servlets/purl/1880982 https://www.osti.gov/biblio/1880982 https://doi.org/10.1016/j.scitotenv.2022.153890 doi:10.1016/j.scitotenv.2022.153890 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1016/j.scitotenv.2022.153890 2023-07-11T10:14:03Z The iron (Fe) speciation and oxidation state have been considered critical factors affecting Fe solubility in the atmosphere and bioavailability in the surface ocean. In this study, elemental composition and Fe speciation in aerosol samples collected at the Palmer Station in the West Antarctic Peninsula were determined using synchrotron-based X-ray fluorescence (XRF) and X-ray Absorption Near-Edge Structure (XANES) spectroscopy. The elemental composition of coarse-mode (>1 mu m) Fe-containing particles suggests that the region's crustal emission is the primary source of aerosol Fe. The Fe minerals in these aerosol particles were predominantly hematite and biotite, but minor fractions of pyrite and ilmenite were observed as well. The Fe oxidation state showed an evident seasonal variation. Further, the Fe(II) content accounted for 71% of the total Fe in the austral summer, while this fraction dropped to 60% in the austral winter. Multivariate linear models involving meteorological parameters suggested that the wind speed, relative humidity, and solar irradiance were the factors that significantly controlled the percentage of Fe(II) in the austral summer. On the contrary, no relationship was found between these factors and the Fe(II) percentage in the austral winter, suggesting that atmospheric photoreduction and regional dust emission were limited. Moreover, the snow depth was significantly (p < 0.05) correlated with the aerosol Fe concentration, confirming the limiting effect of snow/ice cover on the regional dust emission. Given that the Antarctic Peninsula has experienced rapid warming during recent decades, the ice-free areas in the Antarctic Peninsula may act as potential dust sources. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic The Antarctic Antarctic Peninsula Austral Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Science of The Total Environment 824 153890 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Fan, Songyun Gao, Yuan Lai, Barry Elzinga, Evert J. Yu, Shun Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The iron (Fe) speciation and oxidation state have been considered critical factors affecting Fe solubility in the atmosphere and bioavailability in the surface ocean. In this study, elemental composition and Fe speciation in aerosol samples collected at the Palmer Station in the West Antarctic Peninsula were determined using synchrotron-based X-ray fluorescence (XRF) and X-ray Absorption Near-Edge Structure (XANES) spectroscopy. The elemental composition of coarse-mode (>1 mu m) Fe-containing particles suggests that the region's crustal emission is the primary source of aerosol Fe. The Fe minerals in these aerosol particles were predominantly hematite and biotite, but minor fractions of pyrite and ilmenite were observed as well. The Fe oxidation state showed an evident seasonal variation. Further, the Fe(II) content accounted for 71% of the total Fe in the austral summer, while this fraction dropped to 60% in the austral winter. Multivariate linear models involving meteorological parameters suggested that the wind speed, relative humidity, and solar irradiance were the factors that significantly controlled the percentage of Fe(II) in the austral summer. On the contrary, no relationship was found between these factors and the Fe(II) percentage in the austral winter, suggesting that atmospheric photoreduction and regional dust emission were limited. Moreover, the snow depth was significantly (p < 0.05) correlated with the aerosol Fe concentration, confirming the limiting effect of snow/ice cover on the regional dust emission. Given that the Antarctic Peninsula has experienced rapid warming during recent decades, the ice-free areas in the Antarctic Peninsula may act as potential dust sources. |
author |
Fan, Songyun Gao, Yuan Lai, Barry Elzinga, Evert J. Yu, Shun |
author_facet |
Fan, Songyun Gao, Yuan Lai, Barry Elzinga, Evert J. Yu, Shun |
author_sort |
Fan, Songyun |
title |
Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
title_short |
Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
title_full |
Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
title_fullStr |
Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
title_full_unstemmed |
Aerosol iron speciation and seasonal variation of iron oxidation state over the western Antarctic Peninsula |
title_sort |
aerosol iron speciation and seasonal variation of iron oxidation state over the western antarctic peninsula |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1880982 https://www.osti.gov/biblio/1880982 https://doi.org/10.1016/j.scitotenv.2022.153890 |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Austral Palmer Station Palmer-Station |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Austral Palmer Station Palmer-Station |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
http://www.osti.gov/servlets/purl/1880982 https://www.osti.gov/biblio/1880982 https://doi.org/10.1016/j.scitotenv.2022.153890 doi:10.1016/j.scitotenv.2022.153890 |
op_doi |
https://doi.org/10.1016/j.scitotenv.2022.153890 |
container_title |
Science of The Total Environment |
container_volume |
824 |
container_start_page |
153890 |
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1772809539668672512 |