Ice‐nucleating properties of some natural mineral dusts

Mason, B. J.; Maybank, J.

doi:10.1002/qj.49708436104

Cited by 116 publications

(74 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several earlier studies (Mason and Maybank, 1958;Roberts and Hallett, 1968;Shaller and Fukuta, 1979;Bailey and Hallett, 2002) demonstrated that the threshold temperature for ice nucleation by deposition freezing on kaolinite is about 253 K. For immersion mode freezing, an onset temperature of 259 K has been reported (Pitter and Pruppacher, 1973). The results presented here confirm that contact freezing is the most efficient ice nucleation process involving kaolinite particles, with freezing temperatures being observed up to 267 K. In previous work Pitter and Pruppacher (1973) studied contact freezing of water drops with kaolinite and montmorillonite particles.…”

Section: Discussionsupporting

confidence: 77%

Freezing of water droplets colliding with kaolinite particles

et al. 2009

View full text Add to dashboard Cite

Abstract. Contact freezing of single supercooled water droplets colliding with kaolinite dust particles has been investigated. The experiments were performed with droplets levitated in an electrodynamic balance at temperatures from 240 to 268 K. Under relatively dry conditions (when no water vapor was added) freezing was observed to occur below 249 K, while a freezing threshold of 267 K was observed when water vapor was added to the air in the chamber.The effect of relative humidity is attributed to an influence on the contact freezing process for the kaolinite-water droplet system, and it is not related to the lifetime of the droplets in the electrodynamic balance. Freezing probabilities per collision were derived assuming that collisions at the lowest temperature employed had a probability of unity. Mechanisms for contact freezing are briefly discussed.

show abstract

Section: Discussionsupporting

confidence: 77%

Freezing of water droplets colliding with kaolinite particles

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Additionally, older reports have investigated the IN properties of pure feldspar samples in unknown modes (Isono and Ikebe, 1960;Mason and Maybank, 1958). In one study a cold chamber was used to report that 72.4 % of 40-60 µm soil particles containing 5 % feldspar nucleate ice in the immersion mode at temperatures below −20 • C (Rosinski and Nagamoto, 1976b).…”

Section: In Properties Of Feldspar Mineralsmentioning

confidence: 99%

Feldspar minerals as efficient deposition ice nuclei

2013

View full text Add to dashboard Cite

Abstract. Mineral dusts are well known to be efficient ice nuclei, where the source of this efficiency has typically been attributed to the presence of clay minerals such as illite and kaolinite. However, the ice nucleating abilities of the more minor mineralogical components have not been as extensively examined. As a result, the deposition ice nucleation abilities of 24 atmospherically relevant mineral samples have been studied, using a continuous flow diffusion chamber at −40.0 ± 0.3 • C and particles size-selected at 200 nm. By focussing on using the same experimental procedure for all experiments, a relative ranking of the ice nucleating abilities of the samples was achieved. In addition, the ice nucleation behaviour of the pure minerals is compared to that of complex mixtures, such as Arizona Test Dust (ATD) and Mojave Desert Dust (MDD), and to lead iodide, which has been previously proposed for cloud seeding. Lead iodide was the most efficient ice nucleus (IN), requiring a critical relative humidity with respect to ice (RH i ) of 122.0 ± 2.0 % to activate 0.1 % of the particles. MDD (RH i 126.3 ± 3.4 %) and ATD (RH i 129.5 ± 5.1 %) have lower but comparable activity. From a set of clay minerals (kaolinite, illite, montmorillonite), non-clay minerals (e.g. hematite, magnetite, calcite, cerussite, quartz), and feldspar minerals (orthoclase, plagioclase) present in the atmospheric dusts, it was found that the feldspar minerals (particularly orthoclase) and some clays (particularly kaolinite) were the most efficient ice nuclei. Orthoclase and plagioclase were found to have critical RH i values of 127.1 ± 6.3 % and 136.2 ± 1.3 %, respectively. The presence of feldspars (specifically orthoclase) may play a significant role in the IN behaviour of mineral dusts despite their lower percentage in composition relative to clay minerals.

show abstract

“…Mineral dusts (particularly clay minerals) have been shown to be effective ice nucleating particles (INPs) [21][22][23][24][25][26], but determining precisely how composition and mineralogy affect ice nucleation activity (INA) is still up for debate. One study [27] investigated nine abundant minerals (quartz, albite, microcline, calcite, gypsum, montmorillonite, hematite, illite, and kaolinite) commonly found in mineral dust [28] and concluded that kaolinite, illite, and hematite were the most efficient INPs in the depositional mode.…”

Section: Introductionmentioning

confidence: 99%

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Ice‐nucleating properties of some natural mineral dusts

Cited by 116 publications

References 13 publications

Freezing of water droplets colliding with kaolinite particles

Freezing of water droplets colliding with kaolinite particles

Feldspar minerals as efficient deposition ice nuclei

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

Contact Info

Product

Resources

About