Arid
DOI10.5194/acp-16-15075-2016
Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 1: Immersion freezing
Boose, Yvonne1,4; Welti, Andre1,5; Atkinson, James1; Ramelli, Fabiola1; Danielczok, Anja2; Bingemer, Heinz G.2; Ploetze, Michael3; Sierau, Berko1; Kanji, Zamin A.1; Lohmann, Ulrike1
通讯作者Boose, Yvonne ; Kanji, Zamin A.
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2016
卷号16期号:23页码:15075-15095
英文摘要

Desert dust is one of the most abundant ice nucleating particle types in the atmosphere. Traditionally, clay minerals were assumed to determine the ice nucleation ability of desert dust and constituted the focus of ice nucleation studies over several decades. Recently some feldspar species were identified to be ice active at much higher temperatures than clay minerals, redirecting studies to investigate the contribution of feldspar to ice nucleation on desert dust. However, so far no study has shown the atmospheric relevance of this mineral phase.


For this study four dust samples were collected after airborne transport in the troposphere from the Sahara to different locations ( Crete, the Peloponnese, Canary Islands, and the Sinai Peninsula). Additionally, 11 dust samples were collected from the surface from nine of the biggest deserts worldwide. The samples were used to study the ice nucleation behavior specific to different desert dusts. Furthermore, we investigated how representative surface-collected dust is for the atmosphere by comparing to the ice nucleation activity of the airborne samples. We used the IMCA-ZINC setup to form droplets on single aerosol particles which were subsequently exposed to temperatures between 233 and 250 K. Dust particles were collected in parallel on filters for offline cold-stage ice nucleation experiments at 253-263 K. To help the interpretation of the ice nucleation experiments the mineralogical composition of the dusts was investigated. We find that a higher ice nucleation activity in a given sample at 253K can be attributed to the K-feldspar content present in this sample, whereas at temperatures between 238 and 245K it is attributed to the sum of feldspar and quartz content present. A high clay content, in contrast, is associated with lower ice nucleation activity. This confirms the importance of feldspar above 250K and the role of quartz and feldspars determining the ice nucleation activities at lower temperatures as found by earlier studies for monomineral dusts. The airborne samples show on average a lower ice nucleation activity than the surface-collected ones. Furthermore, we find that under certain conditions milling can lead to a decrease in the ice nucleation ability of polymineral samples due to the different hardness and cleavage of individual mineral phases causing an increase of minerals with low ice nucleation ability in the atmospherically relevant size fraction. Comparison of our data set to an existing desert dust parameterization confirms its applicability for climate models. Our results suggest that for an improved prediction of the ice nucleation ability of desert dust in the atmosphere, the modeling of emission and atmospheric transport of the feldspar and quartz mineral phases would be key, while other minerals are only of minor importance.


类型Article
语种英语
国家Switzerland ; Germany
收录类别SCI-E
WOS记录号WOS:000389209000004
WOS关键词MINERAL-DUST ; SAHARAN DUST ; DEPOSITION NUCLEATION ; TECHNICAL NOTE ; ACTIVE-SITES ; NUCLEI ; AEROSOL ; WATER ; EFFICIENCY ; FELDSPAR
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/2XILL650/191585
作者单位1.ETH, Inst Atmospher & Climate Sci, Zurich, Switzerland;
2.Goethe Univ Frankfurt, Inst Atmospher & Environm Sci, Frankfurt, Germany;
3.ETH, Inst Geotech Engn, Zurich, Switzerland;
4.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Garmisch Partenkirchen, Germany;
5.Leibniz Inst Tropospher Res, Leipzig, Germany
推荐引用方式
GB/T 7714
Boose, Yvonne,Welti, Andre,Atkinson, James,et al. Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 1: Immersion freezing[J],2016,16(23):15075-15095.
APA Boose, Yvonne.,Welti, Andre.,Atkinson, James.,Ramelli, Fabiola.,Danielczok, Anja.,...&Lohmann, Ulrike.(2016).Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 1: Immersion freezing.ATMOSPHERIC CHEMISTRY AND PHYSICS,16(23),15075-15095.
MLA Boose, Yvonne,et al."Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 1: Immersion freezing".ATMOSPHERIC CHEMISTRY AND PHYSICS 16.23(2016):15075-15095.
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