Heterogeneous ice nucleation on the muscovite mica surface

Abstract. A differential scanning calorimeter (DSC) was used to explore heterogeneous ice nucleation of emulsified aqueous suspensions of two Arizona test dust (ATD) samples with particle diameters of nominally 0–3 and 0–7 μm, respectively. Aqueous suspensions with ATD concentrations of 0.01–20 wt% have been investigated. The DSC thermograms exhibit a homogeneous and a heterogeneous freezing peak whose intensity ratios vary with the ATD concentration in the aqueous suspensions. Homogeneous freezing temperatures are in good agreement with recent measurements by other techniques. Depending on ATD concentration, heterogeneous ice nucleation occurred at temperatures as high as 256 K or down to the onset of homogeneous ice nucleation (237 K). For ATD-induced ice formation Classical Nucleation Theory (CNT) offers a suitable framework to parameterize nucleation rates as a function of temperature, experimentally determined ATD size, and emulsion droplet volume distributions. The latter two quantities serve to estimate the total heterogeneous surface area present in a droplet, whereas the suitability of an individual heterogeneous site to trigger nucleation is described by the compatibility function (or contact angle) in CNT. The intensity ratio of homogeneous to heterogeneous freezing peaks is in good agreement with the assumption that the ATD particles are randomly distributed amongst the emulsion droplets. The observed dependence of the heterogeneous freezing temperatures on ATD concentrations cannot be described by assuming a constant contact angle for all ATD particles, but requires the ice nucleation efficiency of ATD particles to be (log)normally distributed amongst the particles. Best quantitative agreement is reached when explicitly assuming that high-compatibility sites are rare and that therefore larger particles have on average more and better active sites than smaller ones. This analysis suggests that a particle has to have a diameter of at least 0.1 μm to exhibit on average one active site.

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Simulating the influence of primary biological aerosol particles on clouds by heterogeneous ice nucleation

Atmospheric Chemistry and Physics ◽

10.5194/acp-18-15437-2018 ◽

2018 ◽

Vol 18 (20) ◽

pp. 15437-15450 ◽

Cited By ~ 4

Author(s):

Matthias Hummel ◽

Corinna Hoose ◽

Bernhard Pummer ◽

Caroline Schaupp ◽

Janine Fröhlich-Nowoisky ◽

...

Keyword(s):

Pseudomonas Syringae ◽

Aerosol Particles ◽

Fungal Spores ◽

Ice Nucleation ◽

Ice Crystals ◽

Atmospheric Measurements ◽

Cloud Ice ◽

Biological Aerosol Particles ◽

Ice Phase ◽

Heterogeneous Ice Nucleation

Abstract. Primary ice formation, which is an important process for mixed-phase clouds with an impact on their lifetime, radiative balance, and hence the climate, strongly depends on the availability of ice-nucleating particles (INPs). Supercooled droplets within these clouds remain liquid until an INP immersed in or colliding with the droplet reaches its activation temperature. Only a few aerosol particles are acting as INPs and the freezing efficiency varies among them. Thus, the fraction of supercooled water in the cloud depends on the specific properties and concentrations of the INPs. Primary biological aerosol particles (PBAPs) have been identified as very efficient INPs at high subzero temperatures, but their very low atmospheric concentrations make it difficult to quantify their impact on clouds. Here we use the regional atmospheric model COSMO–ART to simulate the heterogeneous ice nucleation by PBAPs during a 1-week case study on a domain covering Europe. We focus on three highly ice-nucleation-active PBAP species, Pseudomonas syringae bacteria cells and spores from the fungi Cladosporium sp. and Mortierella alpina. PBAP emissions are parameterized in order to represent the entirety of bacteria and fungal spores in the atmosphere. Thus, only parts of the simulated PBAPs are assumed to act as INPs. The ice nucleation parameterizations are specific for the three selected species and are based on a deterministic approach. The PBAP concentrations simulated in this study are within the range of previously reported results from other modeling studies and atmospheric measurements. Two regimes of PBAP INP concentrations are identified: a temperature-limited and a PBAP-limited regime, which occur at temperatures above and below a maximal concentration at around −10 ∘C, respectively. In an ensemble of control and disturbed simulations, the change in the average ice crystal concentration by biological INPs is not statistically significant, suggesting that PBAPs have no significant influence on the average state of the cloud ice phase. However, if the cloud top temperature is below −15 ∘C, PBAP can influence the cloud ice phase and produce ice crystals in the absence of other INPs. Nevertheless, the number of produced ice crystals is very low and it has no influence on the modeled number of cloud droplets and hence the cloud structure.

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Roles of Surface Energy and Temperature in Heterogeneous Ice Nucleation

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.7b02848 ◽

2017 ◽

Vol 121 (21) ◽

pp. 11552-11559 ◽

Cited By ~ 12

Author(s):

Chu Li ◽

Xiang Gao ◽

Zhigang Li

Keyword(s):

Surface Energy ◽

Ice Nucleation ◽

Heterogeneous Ice Nucleation

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Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of <i>α</i>-pinene

Atmospheric Chemistry and Physics ◽

10.5194/acp-16-6495-2016 ◽

2016 ◽

Vol 16 (10) ◽

pp. 6495-6509 ◽

Cited By ~ 33

Author(s):

Karoliina Ignatius ◽

Thomas B. Kristensen ◽

Emma Järvinen ◽

Leonid Nichman ◽

Claudia Fuchs ◽

...

Keyword(s):

Secondary Organic Aerosol ◽

Solid Phase ◽

Particle Surface ◽

Amorphous Solid ◽

Organic Aerosol ◽

Ice Nucleation ◽

Cloud Formation ◽

Particle Surface Area ◽

Semi Solid ◽

Heterogeneous Ice Nucleation

Abstract. There are strong indications that particles containing secondary organic aerosol (SOA) exhibit amorphous solid or semi-solid phase states in the atmosphere. This may facilitate heterogeneous ice nucleation and thus influence cloud properties. However, experimental ice nucleation studies of biogenic SOA are scarce. Here, we investigated the ice nucleation ability of viscous SOA particles. The SOA particles were produced from the ozone initiated oxidation of α-pinene in an aerosol chamber at temperatures in the range from −38 to −10 °C at 5–15 % relative humidity with respect to water to ensure their formation in a highly viscous phase state, i.e. semi-solid or glassy. The ice nucleation ability of SOA particles with different sizes was investigated with a new continuous flow diffusion chamber. For the first time, we observed heterogeneous ice nucleation of viscous α-pinene SOA for ice saturation ratios between 1.3 and 1.4 significantly below the homogeneous freezing limit. The maximum frozen fractions found at temperatures between −39.0 and −37.2 °C ranged from 6 to 20 % and did not depend on the particle surface area. Global modelling of monoterpene SOA particles suggests that viscous biogenic SOA particles are indeed present in regions where cirrus cloud formation takes place. Hence, they could make up an important contribution to the global ice nucleating particle budget.

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Instrument for studies of homogeneous and heterogeneous ice nucleation in free-falling supercooled water droplets

Review of Scientific Instruments ◽

10.1063/1.1511796 ◽

2002 ◽

Vol 73 (11) ◽

pp. 3988-3996 ◽

Cited By ~ 66

Author(s):

Stephen E. Wood ◽

Marcia B. Baker ◽

Brian D. Swanson

Keyword(s):

Supercooled Water ◽

Ice Nucleation ◽

Water Droplets ◽

Free Falling ◽

Heterogeneous Ice Nucleation

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Investigating the Heterogeneous Ice Nucleation of Sea Spray Aerosols UsingProchlorococcusas a Model Source of Marine Organic Matter

Environmental Science & Technology ◽

10.1021/acs.est.8b05150 ◽

2018 ◽

Vol 53 (3) ◽

pp. 1139-1149 ◽

Cited By ~ 7

Author(s):

Martin J. Wolf ◽

Allison Coe ◽

Lilian A. Dove ◽

Maria A. Zawadowicz ◽

Keven Dooley ◽

...

Keyword(s):

Organic Matter ◽

Ice Nucleation ◽

Sea Spray ◽

Model Source ◽

Marine Organic Matter ◽

Heterogeneous Ice Nucleation

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Heterogeneous ice nucleation on biological particles: Bacteria and pollen

10.1063/1.4803414 ◽

2013 ◽

Cited By ~ 1

Author(s):

F. Stratmann ◽

S. Augustin ◽

T. Clauss ◽

S. Hartmann ◽

H. Grothe ◽

...

Keyword(s):

Ice Nucleation ◽

Biological Particles ◽

Heterogeneous Ice Nucleation

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Predicting heterogeneous ice nucleation with a data-driven approach

Nature Communications ◽

10.1038/s41467-020-18605-3 ◽

2020 ◽

Vol 11 (1) ◽

Author(s):

Martin Fitzner ◽

Philipp Pedevilla ◽

Angelos Michaelides

Keyword(s):

Liquid Water ◽

Ice Nucleation ◽

Lattice Match ◽

Density Reduction ◽

Local Ordering ◽

Data Driven Approach ◽

Quantitative Understanding ◽

Foreign Materials ◽

Learning Analysis ◽

Heterogeneous Ice Nucleation

Abstract Water in nature predominantly freezes with the help of foreign materials through a process known as heterogeneous ice nucleation. Although this effect was exploited more than seven decades ago in Vonnegut’s pioneering cloud seeding experiments, it remains unclear what makes a material a good ice former. Here, we show through a machine learning analysis of nucleation simulations on a database of diverse model substrates that a set of physical descriptors for heterogeneous ice nucleation can be identified. Our results reveal that, beyond Vonnegut’s connection with the lattice match to ice, three new microscopic factors help to predict the ice nucleating ability. These are: local ordering induced in liquid water, density reduction of liquid water near the surface and corrugation of the adsorption energy landscape felt by water. With this we take a step towards quantitative understanding of heterogeneous ice nucleation and the in silico design of materials to control ice formation.

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