Heterogeneous Ice Nucleation by Soufriere Hills Volcanic Ash Immersed in Water Droplets

Mangan, Thomas P.; Atkinson, James; Neuberg, Jürgen; O’Sullivan, Daniel; Wilson, T. W.; Whale, Thomas F.; Neve, Lesley; Umo, Nsikanabasi Silas; Malkin, T. L.; Murray, Benjamin J.

doi:10.1371/journal.pone.0169720

Cited by 19 publications

(54 citation statements)

References 42 publications

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“…K-feldspars and quartz were found to be the two most efficient immersion INPs in mineral dust even though they were found in low weight percentages in samples [29]. In studies of volcanic ash, immersion INA has been either attributed to quartz [37], Na-feldspar [38], or K-feldspars [57]. These previous studies focus on the roles of particular minerals instead of bulk chemical composition, yet volcanic ash can contain many different elements present in an amorphous glass phase in addition to those existing in a crystallographic structure.…”

Section: Immersion-mode Ice Nucleation Activitymentioning

confidence: 99%

“…However, there may be a bulk compositional effect at higher temperatures. Mechanical grinding of the grains may alter sites for ice formation and increase INA [31,37,38], and this may explain the deposition mode results, since all samples were mechanically milled to homogenize grain shape and size prior to the experiments. However, this apparent efficiency may simply result from all of the surface area available on which ice can nucleate (i.e., overseeding [8]), suggesting that all ash samples used here have similar values due to their similar surface areas.…”

Section: Deposition-mode Ice Nucleation Activitymentioning

confidence: 99%

“…More recent studies [30][31][32][33] confirm previous results [29] in which K-feldspars are the most efficient INPs in comparison to other minerals tested, including Na/Ca-feldspars, clay minerals, quartz, calcite, metal sulfates, and metal oxides. Several studies [8,16,17,[34][35][36][37][38] have conducted nucleation experiments on volcanic ash, using samples from a limited number of volcanoes; thus, there is ample opportunity to add to the current dataset concerning volcanic ash INA. Because the motivation of this study is to examine the roles of bulk composition and mineral content, these samples are not composed of ash originally formed during explosive eruptions, but ash manufactured from other types of volcanic deposits.…”

Section: Introductionmentioning

confidence: 99%

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Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

et al. 2018

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Volcanic ash produced during explosive eruptions may serve as ice nuclei in the atmosphere, contributing to the occurrence of volcanic lightning due to tribocharging from ice-ice or ice-ash collisions. Here, different ash samples were tested using deposition-mode and immersion-mode ice nucleation experiments. Results show that bulk composition and mineral abundance have no measurable effect on depositional freezing at the temperatures tested, as all samples have similar ice saturation ratios. In the immersion mode, there is a strong positive correlation between K 2 O content and ice nucleation site density at −25 • C and a strong negative correlation between MnO and TiO 2 content at temperatures from −35 to −30 • C. The most efficient sample in the immersion mode has the highest surface area, smallest average grain size, highest K 2 O content, and lowest MnO content. These results indicate that although ash abundance-which creates more available surface area for nucleation-has a significant effect on immersion-mode freezing, composition may also contribute. Consequently, highly explosive eruptions of compositionally evolved magmas create the necessary parameters to promote ice nucleation on grain surfaces, which permits tribocharging due to ice-ice or ice-ash collisions, and contribute to the frequent occurrence of volcanic lightning within the eruptive column and plume during these events.

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Section: Immersion-mode Ice Nucleation Activitymentioning

confidence: 99%

Section: Deposition-mode Ice Nucleation Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

et al. 2018

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“…Freely exposed feldspar are reported to be populated by lichens which can alter naturally occurring feldspar in an infinite number of ways (Smith, 1998). The surface properties (specific area, porosity, molecules on the surface) of freshly ground feldspar is therefore expected to be different from aged particles (Mangan et al, 2017). However, bulk composition and crystal structure can be assumed to be representative for natural feldspar.…”

Section: Chemical Composition 15mentioning

confidence: 99%

“…Despite the lower mass fraction of feldspars found in the airborne Saharan dust samples, Boose et al (2016) concluded that these could be relevant for atmospheric cloud glaciation at warmer temperatures (T > 250 K). Explosive volcanic eruptions can introduce large quantities of feldspar 25 particles into the atmosphere with a regional to global effect on cloud glaciation (Mangan et al, 2017). The analysis of ash particles that make up volcanic ash clouds showed that up to 70% can be feldspar (usually plagioclase feldspars, rarely sanidine) particles (Bayhurst et al, 1994,;Schumann et al, 2011).…”

mentioning

confidence: 99%

Ice nucleation properties of K-feldspar polymorphs and plagioclase feldspars

Welti¹,

Lohmann²,

Kanji³

2019

Preprint

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Abstract. The relation between the mineralogical characteristics of size selected feldspar particles from 50&#8211;800&#8201;nm and their ability to act as ice nucleating particles (INPs) in the immersion mode is presented. Five polymorph members of K-feldspar (two microclines, orthoclase, adularia and sanidine) and four Na/Ca- rich feldspar samples (three labradorites and a pericline sample) are tested. Microcline was found to be the most active INP in the immersion mode consistent with previous findings. Samples are selected for their differences in typical feldspar properties such as crystal structure, bulk and trace elemental composition and ordering of the crystal lattice. The mentioned properties are related to the temperature of feldspar crystallization from the melt rocks during formation. Properties characteristic for low temperature feldspar formation coincide with an increased ability to nucleate ice. Ice nucleation is most efficient on the crystallographic ordered, triclinic K-feldspar species microcline, while the intermediate and disordered, monoclinic K-feldspar polymorphs orthoclase and sanidine nucleate ice at lower temperatures. The ice nucleation ability of disordered, triclinic Na/Ca-feldspar is comparable to disordered K-feldspar. The conditions of feldspar rock formation also leave a chemical fingerprint with varying abundance of trace elements in the samples. X-ray fluorescence spectroscopy analysis to determine metal oxide and trace elemental composition of the feldspar samples revealed a correlation with median freezing temperatures (T50) of the K-feldspar samples allowing to sort them for their ice nucleation efficiency according to the abundance of specific trace elements. A pronounced size dependence of ice nucleation activity for the feldspar samples is observed, which also depends on mineralogical characteristics. In particular, microcline exhibited immersion freezing even for 50&#8201;nm particles which is unique for heterogeneous ice nucleation of mineral dusts. This suggests that small microcline particles that are susceptible to long-range transport can affect cloud properties via immersion freezing far away from the source. The measurements generally imply that temperatures at which feldspars can affect cloud glaciation depends on the transported particle size.

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Study on ice nucleation temperature and water freezing in saline soils

Wan

Liu

Qiu

2020

Permafrost & Periglacial

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This paper presents a computational model of the freezing point of soil and the nucleation rate of ice based on the soil volume for saline soils. Physicochemical methods and crystallization theory are used to explore the macroscopic mechanism of water freezing induced by ice crystallization, and the influence of water undercooling is discussed with regard to different soil volumes and salt contents. Growth sites, shapes, and sizes of ice crystals are determined by an assumption of heterogeneous nucleation, and the contact angle is introduced to represent a wide range of soils. The relationship between the initial contact angle and the salt content is analyzed quantitatively through an indoor cooling test and thermal difference analysis. Moreover, the van Genuchten model is applied to provide an equation for the unfrozen water content in salty soils, and the probability of ice formation is introduced to investigate the variation of contact angle during the soil freezing process. This study shows that the initial radius of an ice crystal decreases as the salt concentration decreases. The temperature of ice nucleation is determined mainly by the contact angle of ice crystals, which decreases as the soil volume increases and results in decreased supercooling.

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Heterogeneous Ice Nucleation by Soufriere Hills Volcanic Ash Immersed in Water Droplets

Cited by 19 publications

References 42 publications

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

Ice nucleation properties of K-feldspar polymorphs and plagioclase feldspars

Study on ice nucleation temperature and water freezing in saline soils

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