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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Main Authors: | , , , , , , , , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.archives-ouvertes.fr/hal-03004734 https://hal.archives-ouvertes.fr/hal-03004734/document https://hal.archives-ouvertes.fr/hal-03004734/file/acp-20-13521-2020.pdf https://doi.org/10.5194/acp-20-13521-2020 |
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ftunivnantes:oai:HAL:hal-03004734v1 |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
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English |
topic |
[SDE.MCG]Environmental Sciences/Global Changes |
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[SDE.MCG]Environmental Sciences/Global Changes 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 |
[SDE.MCG]Environmental Sciences/Global Changes |
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 |
SCHOOL OF GEOGRAPHY EARTH AND ENVIRONMENTAL SCIENCES UNIVERSITY OF BIRMINGHAM GBR Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
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-03004734 https://hal.archives-ouvertes.fr/hal-03004734/document https://hal.archives-ouvertes.fr/hal-03004734/file/acp-20-13521-2020.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-03004734 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-03004734 https://hal.archives-ouvertes.fr/hal-03004734 https://hal.archives-ouvertes.fr/hal-03004734/document https://hal.archives-ouvertes.fr/hal-03004734/file/acp-20-13521-2020.pdf doi:10.5194/acp-20-13521-2020 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-20-13521-2020 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
20 |
container_issue |
21 |
container_start_page |
13521 |
op_container_end_page |
13539 |
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1766043131821686784 |
spelling |
ftunivnantes:oai:HAL:hal-03004734v1 2023-05-15T16:52:45+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 SCHOOL OF GEOGRAPHY EARTH AND ENVIRONMENTAL SCIENCES UNIVERSITY OF BIRMINGHAM GBR Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2020-11-12 https://hal.archives-ouvertes.fr/hal-03004734 https://hal.archives-ouvertes.fr/hal-03004734/document https://hal.archives-ouvertes.fr/hal-03004734/file/acp-20-13521-2020.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-03004734 https://hal.archives-ouvertes.fr/hal-03004734 https://hal.archives-ouvertes.fr/hal-03004734/document https://hal.archives-ouvertes.fr/hal-03004734/file/acp-20-13521-2020.pdf doi:10.5194/acp-20-13521-2020 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.archives-ouvertes.fr/hal-03004734 Atmospheric Chemistry and Physics, European Geosciences Union, 2020, 20, pp.13521 - 13539. ⟨10.5194/acp-20-13521-2020⟩ [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.5194/acp-20-13521-2020 2022-08-10T02:43:26Z 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 Université de Nantes: HAL-UNIV-NANTES Atmospheric Chemistry and Physics 20 21 13521 13539 |