Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust
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 biogeochemical cycles. The impacts of Icelandic dust depend on its mi...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054615 2023-05-15T16:52:59+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. Robert Shi, Zongbo 2020-11 electronic https://doi.org/10.5194/acp-20-13521-2020 https://noa.gwlb.de/receive/cop_mods_00054615 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054266/acp-20-13521-2020.pdf https://acp.copernicus.org/articles/20/13521/2020/acp-20-13521-2020.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-20-13521-2020 https://noa.gwlb.de/receive/cop_mods_00054615 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054266/acp-20-13521-2020.pdf https://acp.copernicus.org/articles/20/13521/2020/acp-20-13521-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/acp-20-13521-2020 2022-02-08T22:34:56Z 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 biogeochemical 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 PM10 and PM20 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 (amorphous 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 PM10, 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 impact primary productivity in the North Atlantic Ocean. The distinct chemical and mineralogical composition, particularly the high magnetite content (1 wt %–2 wt %), indicates a potentially significant impact of Icelandic dust on the radiation balance in the subpolar and polar regions. Article in Journal/Newspaper Iceland North Atlantic Niedersächsisches Online-Archiv NOA Atmospheric Chemistry and Physics 20 21 13521 13539 |
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article Verlagsveröffentlichung 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. Robert Shi, Zongbo Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust |
topic_facet |
article Verlagsveröffentlichung |
description |
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 biogeochemical 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 PM10 and PM20 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 (amorphous 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 PM10, 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 impact primary productivity in the North Atlantic Ocean. The distinct chemical and mineralogical composition, particularly the high magnetite content (1 wt %–2 wt %), indicates a potentially significant impact of Icelandic dust on the radiation balance in the subpolar and polar regions. |
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. Robert 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. Robert 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 |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/acp-20-13521-2020 https://noa.gwlb.de/receive/cop_mods_00054615 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054266/acp-20-13521-2020.pdf https://acp.copernicus.org/articles/20/13521/2020/acp-20-13521-2020.pdf |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-20-13521-2020 https://noa.gwlb.de/receive/cop_mods_00054615 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054266/acp-20-13521-2020.pdf https://acp.copernicus.org/articles/20/13521/2020/acp-20-13521-2020.pdf |
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https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-20-13521-2020 |
container_title |
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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1766043488208551936 |