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Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 2: Deposition nucleation and condensation freezing

Boose, Yvonne and Baloh, Philipp and Plötze, Michael and Ofner, Johannes and Grothe, Hinrich and Sierau, Berko and Lohmann, Ulrike and Kanji, Zamin A. (2019) Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 2: Deposition nucleation and condensation freezing. Atmospheric Chemistry and Physics, 19 (2), pp. 1059-1076. Copernicus Publications. ISSN 1680-7316.

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Official URL: http://dx.doi.org/10.5194/acp-19-1059-2019


Mineral dust particles from deserts are amongst the most common ice nucleating particles in the atmosphere. The mineralogy of desert dust differs depending on the source region and can further fractionate during the dust emission processes. Mineralogy to a large extent explains the ice nucleation behavior of desert aerosol, but not entirely. Apart from pure mineral dust, desert aerosol particles often exhibit a coating or are mixed with small amounts of biological material. Aging on the ground or during atmospheric transport can deactivate nucleation sites, thus strong ice nucleating minerals may not exhibit their full potential. In the partner paper of this work, it was shown that mineralogy determines most but not all of the ice nucleation behavior in the immersion mode found for desert dust. In this study, the influence of semi-volatile organic compounds and the presence of crystal water on the ice nucleation behavior of desert aerosol is investigated. This work focuses on the deposition and condensation ice nucleation modes at temperatures between 238 and 242 K of 18 dust samples sourced from nine deserts worldwide. Chemical imaging of the particles' surface is used to determine the cause of the observed differences in ice nucleation. It is found that, while the ice nucleation ability of the majority of the dust samples is dominated by their quartz and feldspar content, in one carbonaceous sample it is mostly caused by organic matter, potentially cellulose or proteins. In contrast, the ice nucleation ability of an airborne Saharan sample is found to be diminished, likely by semi-volatile species covering ice nucleation active sites of the minerals. This study shows that in addition to mineralogy, other factors such as organics and crystal water content can alter the ice nucleation behavior of desert aerosol during atmospheric transport in various ways.

Item URL in elib:https://elib.dlr.de/131651/
Document Type:Article
Title:Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide - Part 2: Deposition nucleation and condensation freezing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Boose, YvonneDLR, IPA und ETH Zürich, Schweizhttps://orcid.org/0000-0001-9495-2165
Baloh, PhilippTechnische Univ. Wien, ÖsterreichUNSPECIFIED
Plötze, MichaelETH Zürich, SchweizUNSPECIFIED
Ofner, JohannesTechnische Univ. Wien, ÖsterreichUNSPECIFIED
Grothe, HinrichTechnische Univ. Wien, ÖsterreichUNSPECIFIED
Sierau, BerkoETH Zürich, SchweizUNSPECIFIED
Lohmann, UlrikeETH Zürich, SchweizUNSPECIFIED
Kanji, Zamin A.ETH Zürich, SchweizUNSPECIFIED
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1059-1076
Publisher:Copernicus Publications
Keywords:mineral dust particles, ice nucleation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics
Deposited By: Voigt, Dr.rer.nat. Christiane
Deposited On:29 Nov 2019 14:44
Last Modified:20 Mar 2020 11:13

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