Laboratory study of heterogeneous ice nucleation in deposition mode of montmorillonite mineral dust particles aged with ammonia, sulfur dioxide, and ozone at polluted atmospheric concentrations

Salam, Abdus; Lesins, Glen; Lohmann, Ulrike

doi:10.1007/s11869-008-0019-6

Cited by 26 publications

(36 citation statements)

References 36 publications

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“…There has been one previous study that investigated the influence on ice nucleation of ageing montmorillonite at 200 ppbv O 3 for 233 < T < 258 K (Salam et al, 2008). In the study, a CFDC was used to detect deposition mode ice nucleation and results reported for AF at RH w = 90 % showed no difference in IN activity between O 3 aged and untreated montmorillonite particles.…”

Section: Comparison To Previous Workmentioning

confidence: 99%

“…First, montmorillonite will exhibit dissimilar surface composition and active site distributions will likely differ compared to Ka or ATD. Second, one concentration of O 3 (200 ppbv) was applied in the Salam et al (2008) study, which is less than half the concentration used in the LE here. Third, ageing times were significantly different, 70 h in the Salam et al (2008) study and ∼ 2 h in the current work.…”

Section: Comparison To Previous Workmentioning

confidence: 99%

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Laboratory studies of immersion and deposition mode ice nucleation of ozone aged mineral dust particles

et al. 2013

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Abstract. Ice nucleation in the atmosphere is central to the understanding the microphysical properties of mixed-phase and cirrus clouds. Ambient conditions such as temperature (T) and relative humidity (RH), as well as aerosol properties such as chemical composition and mixing state play an important role in predicting ice formation in the troposphere. Previous field studies have reported the absence of sulfate and organic compounds on mineral dust ice crystal residuals sampled at mountain top stations or aircraft based measurements despite the long-range transport mineral dust is subjected to. We present laboratory studies of ice nucleation for immersion and deposition mode on ozone aged mineral dust particles for 233 < T < 263 K. Heterogeneous ice nucleation of untreated kaolinite (Ka) and Arizona Test Dust (ATD) particles is compared to corresponding aged particles that are subjected to ozone concentrations of 0.4–4.3 ppmv in a stainless steel aerosol tank. The portable ice nucleation counter (PINC) and immersion chamber combined with the Zurich ice nucleation chamber (IMCA-ZINC) are used to conduct deposition and immersion mode measurements, respectively. Ice active fractions as well as ice active surface site densities (ns) are reported and observed to increase as a function of decreasing temperature. We present first results that demonstrate enhancement of the ice nucleation ability of aged mineral dust particles in both the deposition and immersion mode due to ageing. We also present the first results to show a suppression of heterogeneous ice nucleation activity without the condensation of a coating of (in)organic material. In immersion mode, low ozone exposed Ka particles showed enhanced ice activity requiring a median freezing temperature of 1.5 K warmer than that of untreated Ka, whereas high ozone exposed ATD particles showed suppressed ice nucleation requiring a median freezing temperature of 3 K colder than that of untreated ATD. In deposition mode, low exposure Ka had ice active fractions of an order of magnitude higher than untreated Ka, whereas high ozone exposed ATD had ice active fractions up to a factor of 4 lower than untreated ATD. From our results, we derive and present parameterizations in terms of ns(T) that can be used in models to predict ice nuclei concentrations based on available aerosol surface area.

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Section: Comparison To Previous Workmentioning

confidence: 99%

Section: Comparison To Previous Workmentioning

confidence: 99%

Laboratory studies of immersion and deposition mode ice nucleation of ozone aged mineral dust particles

et al. 2013

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“…Among these instruments, the Continuous Flow Diffusion Chamber (CFDC) (Rogers, 1988) has proven to be a useful tool to measure the conditions required to nucleate ice crystals on various INPs. Studies have been conducted on different nucleation and freezing mechanisms using many types of aerosol particles under a wide range of temperatures and relative humidities (RHs) (Rogers, 1988;Salam et al, 2008;Stetzer et al, 2008). Improved versions of the original cylindrical chamber described by Rogers (1988) have been successfully deployed in ground-and aircraft-based field campaigns (Chen et al, 1998;DeMott et al, 2003a, b).…”

Section: Introductionmentioning

confidence: 99%

The SPectrometer for Ice Nuclei (SPIN): an instrument to investigate ice nucleation

et al. 2016

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Abstract. The SPectrometer for Ice Nuclei (SPIN) is a commercially available ice nucleating particle (INP) counter manufactured by Droplet Measurement Technologies in Boulder, CO. The SPIN is a continuous flow diffusion chamber with parallel plate geometry based on the Zurich Ice Nucleation Chamber and the Portable Ice Nucleation Chamber. This study presents a standard description for using the SPIN instrument and also highlights methods to analyze measurements in more advanced ways. It characterizes and describes the behavior of the SPIN chamber, reports data from laboratory measurements, and quantifies uncertainties associated with the measurements. Experiments with ammonium sulfate are used to investigate homogeneous freezing of deliquesced haze droplets and droplet breakthrough. Experiments with kaolinite, NX illite, and silver iodide are used to investigate heterogeneous ice nucleation. SPIN nucleation results are compared to those from the literature. A machine learning approach for analyzing depolarization data from the SPIN optical particle counter is also presented (as an advanced use). Overall, we report that the SPIN is able to reproduce previous INP counter measurements.

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“…In addition, when investigated in the laboratory, more factors such as aerosol preparation and preconditioning as well as ice particle detection methods and observation time become potentially important factors to consider when reporting ice formation requisites. Finally, exposure to trace species (organics,NH 3 , NO x , SO 2 , O 3 ) may further modify the surface of IN (Salam et al, 2007;Kanji et al, 2008;Salam et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Results from the University of Toronto continuous flow diffusion chamber at ICIS 2007: instrument intercomparison and ice onsets for different aerosol types

et al. 2011

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Abstract. The University of Toronto continuous flow diffusion chamber (UT-CFDC) was used to study heterogeneous ice nucleation at the International Workshop on Comparing Ice Nucleation Measuring Systems (ICIS 2007) which also represented the 4-th ice nucleation workshop, on 14-28 September 2007. One goal of the workshop was to intercompare different ice nucleation measurement techniques using the same aerosol sample source and preparation method. The aerosol samples included four types of desert mineral dust, graphite soot particles, and live and dead bacterial cells (Snomax®). This paper focuses on the UT-CFDC results, with a comparison to techniques of established heritage including the Colorado State CFDC and the AIDA expansion chamber. Good agreement was found between the different instruments with a few specific differences, especially at low temperatures, perhaps due to the variation in how onset of ice formation is defined between the instruments and the different inherent residence times. It was found that when efficiency of ice formation is based on the lowest onset relative humidity, Snomax® particles were most efficient followed by the desert dusts and then soot. For all aerosols, deposition mode freezing was only observed for T <45 K except for the dead bacteria where freezing occurred below water saturation as warm as 263 K.

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Laboratory study of heterogeneous ice nucleation in deposition mode of montmorillonite mineral dust particles aged with ammonia, sulfur dioxide, and ozone at polluted atmospheric concentrations

Cited by 26 publications

References 36 publications

Laboratory studies of immersion and deposition mode ice nucleation of ozone aged mineral dust particles

Laboratory studies of immersion and deposition mode ice nucleation of ozone aged mineral dust particles

The SPectrometer for Ice Nuclei (SPIN): an instrument to investigate ice nucleation

Results from the University of Toronto continuous flow diffusion chamber at ICIS 2007: instrument intercomparison and ice onsets for different aerosol types

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