Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust
International audience Iceland is a highly active source of natural dust. Icelandic dust has the potential to directly affect the climate via dust-radiation interaction and indirectly via dust-cloud interaction, the snow/ice albedo effect and impacts on bio-geochemical cycles. The impacts of Iceland...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705/document https://hal.archives-ouvertes.fr/hal-03005705/file/Baldo_DUST_ACP2020.pdf https://doi.org/10.5194/acp-20-13521-2020 |
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ftccsdartic:oai:HAL:hal-03005705v1 2023-05-15T16:52:51+02:00 Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust Baldo, Clarissa Formenti, Paola Nowak, Sophie Chevaillier, Servanne Cazaunau, Mathieu Pangui, Edouard Di Biagio, Claudia Doussin, Jean-Francois Ignatyev, Konstantin Dagsson-Waldhauserova, Pavla Arnalds, Olafur Mackenzie, A, SHI, Zongbo University of Birmingham Birmingham 2020 https://hal.archives-ouvertes.fr/hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705/document https://hal.archives-ouvertes.fr/hal-03005705/file/Baldo_DUST_ACP2020.pdf https://doi.org/10.5194/acp-20-13521-2020 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-20-13521-2020 hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705/document https://hal.archives-ouvertes.fr/hal-03005705/file/Baldo_DUST_ACP2020.pdf doi:10.5194/acp-20-13521-2020 info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.archives-ouvertes.fr/hal-03005705 Atmospheric Chemistry and Physics, European Geosciences Union, 2020, 20, pp.13521 - 13539. ⟨10.5194/acp-20-13521-2020⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.5194/acp-20-13521-2020 2021-12-05T00:55:36Z International audience Iceland is a highly active source of natural dust. Icelandic dust has the potential to directly affect the climate via dust-radiation interaction and indirectly via dust-cloud interaction, the snow/ice albedo effect and impacts on bio-geochemical cycles. The impacts of Icelandic dust depend on its mineralogical and chemical composition. However, a lack of data has prevented an accurate assessment of the role of Icelandic dust in the Earth system. Here, we collected surface sediment samples from five major Icelandic dust hotspots. Dust aerosols were generated and suspended in atmospheric chambers, and PM 10 and PM 20 fractions were collected for further analysis. We found that the dust samples primarily consist of amorphous basaltic materials ranging from 8 wt % (from the Hagavatn hotspot) to 60 wt %-90 wt % (other hotspots). Samples had relatively high total Fe content (10 wt %-13 wt %). Sequential extraction of Fe to determine its chemical form shows that dithionite Fe (Fe oxides such as hematite and goethite) and ascorbate Fe (amor-phous Fe) contribute respectively 1 %-6 % and 0.3 %-1.4 % to the total Fe in Icelandic dust. The magnetite fraction is 7 %-15 % of total Fe and 1 %-2 wt % of PM 10 , which is orders of magnitude higher than in mineral dust from northern Africa. Nevertheless, about 80 %-90% of the Fe is contained in pyroxene and amorphous glass. The initial Fe solubility (ammonium acetate extraction at pH 4.7) is from 0.08 % to 0.6 %, which is comparable to low-latitude dust such as that from northern Africa. The Fe solubility at low pH (i.e. pH 2) is significantly higher than typical low-latitude dust (up to 30 % at pH 2 after 72 h). Our results revealed the fundamental differences in composition and mineralogy of Icelandic dust from low-latitude dust. We attribute these differences to the low degree of chemical weathering, the basaltic composition of the parent sediments and glacial processes. Icelandic dust contributes to the atmospheric deposition of soluble Fe and can ... Article in Journal/Newspaper Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Atmospheric Chemistry and Physics 20 21 13521 13539 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Baldo, Clarissa Formenti, Paola Nowak, Sophie Chevaillier, Servanne Cazaunau, Mathieu Pangui, Edouard Di Biagio, Claudia Doussin, Jean-Francois Ignatyev, Konstantin Dagsson-Waldhauserova, Pavla Arnalds, Olafur Mackenzie, A, SHI, Zongbo Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Iceland is a highly active source of natural dust. Icelandic dust has the potential to directly affect the climate via dust-radiation interaction and indirectly via dust-cloud interaction, the snow/ice albedo effect and impacts on bio-geochemical cycles. The impacts of Icelandic dust depend on its mineralogical and chemical composition. However, a lack of data has prevented an accurate assessment of the role of Icelandic dust in the Earth system. Here, we collected surface sediment samples from five major Icelandic dust hotspots. Dust aerosols were generated and suspended in atmospheric chambers, and PM 10 and PM 20 fractions were collected for further analysis. We found that the dust samples primarily consist of amorphous basaltic materials ranging from 8 wt % (from the Hagavatn hotspot) to 60 wt %-90 wt % (other hotspots). Samples had relatively high total Fe content (10 wt %-13 wt %). Sequential extraction of Fe to determine its chemical form shows that dithionite Fe (Fe oxides such as hematite and goethite) and ascorbate Fe (amor-phous Fe) contribute respectively 1 %-6 % and 0.3 %-1.4 % to the total Fe in Icelandic dust. The magnetite fraction is 7 %-15 % of total Fe and 1 %-2 wt % of PM 10 , which is orders of magnitude higher than in mineral dust from northern Africa. Nevertheless, about 80 %-90% of the Fe is contained in pyroxene and amorphous glass. The initial Fe solubility (ammonium acetate extraction at pH 4.7) is from 0.08 % to 0.6 %, which is comparable to low-latitude dust such as that from northern Africa. The Fe solubility at low pH (i.e. pH 2) is significantly higher than typical low-latitude dust (up to 30 % at pH 2 after 72 h). Our results revealed the fundamental differences in composition and mineralogy of Icelandic dust from low-latitude dust. We attribute these differences to the low degree of chemical weathering, the basaltic composition of the parent sediments and glacial processes. Icelandic dust contributes to the atmospheric deposition of soluble Fe and can ... |
author2 |
University of Birmingham Birmingham |
format |
Article in Journal/Newspaper |
author |
Baldo, Clarissa Formenti, Paola Nowak, Sophie Chevaillier, Servanne Cazaunau, Mathieu Pangui, Edouard Di Biagio, Claudia Doussin, Jean-Francois Ignatyev, Konstantin Dagsson-Waldhauserova, Pavla Arnalds, Olafur Mackenzie, A, SHI, Zongbo |
author_facet |
Baldo, Clarissa Formenti, Paola Nowak, Sophie Chevaillier, Servanne Cazaunau, Mathieu Pangui, Edouard Di Biagio, Claudia Doussin, Jean-Francois Ignatyev, Konstantin Dagsson-Waldhauserova, Pavla Arnalds, Olafur Mackenzie, A, SHI, Zongbo |
author_sort |
Baldo, Clarissa |
title |
Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
title_short |
Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
title_full |
Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
title_fullStr |
Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
title_full_unstemmed |
Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
title_sort |
distinct chemical and mineralogical composition of icelandic dust compared to northern african and asian dust |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705/document https://hal.archives-ouvertes.fr/hal-03005705/file/Baldo_DUST_ACP2020.pdf https://doi.org/10.5194/acp-20-13521-2020 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.archives-ouvertes.fr/hal-03005705 Atmospheric Chemistry and Physics, European Geosciences Union, 2020, 20, pp.13521 - 13539. ⟨10.5194/acp-20-13521-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-20-13521-2020 hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705 https://hal.archives-ouvertes.fr/hal-03005705/document https://hal.archives-ouvertes.fr/hal-03005705/file/Baldo_DUST_ACP2020.pdf doi:10.5194/acp-20-13521-2020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-20-13521-2020 |
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Atmospheric Chemistry and Physics |
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20 |
container_issue |
21 |
container_start_page |
13521 |
op_container_end_page |
13539 |
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1766043314130255872 |