干旱区生态环境知识资源中心(Arid): Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust

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DOI	10.5194/acp-20-13521-2020
	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
通讯作者	Shi, ZB
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
EISSN	1680-7324
出版年	2020
卷号	20 期号:21 页码:13521-13539
英文摘要	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.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000588611700008
WOS关键词	HIGH-LATITUDE DUST ; LIGHT-ABSORBING IMPURITIES ; AIRBORNE VOLCANIC ASH ; IN-SITU MEASUREMENTS ; IRON SOLUBILITY ; OPTICAL-PROPERTIES ; DESERT DUST ; ATMOSPHERIC DEPOSITION ; RADIATIVE PROPERTIES ; SHORTWAVE SPECTRUM
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327467
作者单位	[Baldo, Clarissa; MacKenzie, A. Robert; Shi, Zongbo] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England; [Formenti, Paola; Chevaillier, Servanne; Cazaunau, Mathieu; Pangui, Edouard; Di Biagio, Claudia; Doussin, Jean-Francois] Univ Paris, Univ Paris Est Creteil, Inst Pierre Simon Laplace IPSL, LISA,UMR CNRS 7583, Creteil, France; [Nowak, Sophie] Univ Paris, Plateforme RX UFR Chim, Paris, France; [Ignatyev, Konstantin] Diamond Light Source, Didcot, Oxon, England; [Dagsson-Waldhauserova, Pavla; Arnalds, Olafur] Agr Univ Iceland, Reykjavik, Iceland; [Dagsson-Waldhauserova, Pavla] Czech Univ Life Sci Prague, Fac Environm Sci, Prague, Czech Republic
推荐引用方式 GB/T 7714	Baldo, Clarissa,Formenti, Paola,Nowak, Sophie,et al. Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust[J],2020,20(21):13521-13539.
APA	Baldo, Clarissa.,Formenti, Paola.,Nowak, Sophie.,Chevaillier, Servanne.,Cazaunau, Mathieu.,...&Shi, Zongbo.(2020).Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21),13521-13539.
MLA	Baldo, Clarissa,et al."Distinct chemical and mineralogical composition of Icelandic dust compared to northern African and Asian dust".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020):13521-13539.