Crystallization and immersion freezing ability of oxalic and succinic acid in multicomponent aqueous organic aerosol particles

Wagner, Robert; Höhler, Kristina; Möhler, Ottmar; Saathoff, H.; Schnaiter, M.

doi:10.1002/2015gl063075

Cited by 14 publications

(27 citation statements)

References 49 publications

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“…AIDA can be operated as an expansion chamber to simulate the atmospheric conditions in ascending cloud parcels in the temperature range down to −90 • C. The general experimental procedure applied in these cloud expansion experiments has been described in several publications (e.g., Möhler et al, 2005a;Wagner et al, 2006Wagner et al, , 2015Schnaiter et al, 2012). In the present study, the chamber was used to simulate ice clouds in the cirrus temperature regime.…”

Section: Cloud Chamber Simulation Experimentsmentioning

confidence: 99%

Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds

et al. 2016

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Abstract. This study reports on the origin of small-scale ice crystal complexity and its influence on the angular light scattering properties of cirrus clouds. Cloud simulation experiments were conducted at the AIDA (Aerosol Interactions and Dynamics in the Atmosphere) cloud chamber of the Karlsruhe Institute of Technology (KIT). A new experimental procedure was applied to grow and sublimate ice particles at defined super-and subsaturated ice conditions and for temperatures in the −40 to −60 • C range. The experiments were performed for ice clouds generated via homogeneous and heterogeneous initial nucleation. Small-scale ice crystal complexity was deduced from measurements of spatially resolved single particle light scattering patterns by the latest version of the Small Ice Detector (SID-3). It was found that a high crystal complexity dominates the microphysics of the simulated clouds and the degree of this complexity is dependent on the available water vapor during the crystal growth. Indications were found that the small-scale crystal complexity is influenced by unfrozen H 2 SO 4 /H 2 O residuals in the case of homogeneous initial ice nucleation. Angular light scattering functions of the simulated ice clouds were measured by the two currently available airborne polar nephelometers: the polar nephelometer (PN) probe of Laboratoire de Métérologie et Physique (LaMP) and the Particle Habit Imaging and Polar Scattering (PHIPS-HALO) probe of KIT. The measured scattering functions are featureless and flat in the side and backward scattering directions. It was found that these functions have a rather low sensitivity to the small-scale crystal complexity for ice clouds that were grown under typical atmospheric conditions. These results have implications for the microphysical properties of cirrus clouds and for the radiative transfer through these clouds.

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Section: Cloud Chamber Simulation Experimentsmentioning

confidence: 99%

Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds

et al. 2016

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“…3a, the calculated surface tension of NaCl aqueous solution (σ , ) are compared with experimentally determined values (Jarvis and Scheiman, 1968;Johansson and Eriksson, 1974;Aveyard and Saleem, 1976;Weissenborn and Pugh, 1995;Matubayasi et al, 2001;Pegram andRecord, 2006, 2007;Morris et al, 2015;Bzdek et al, 2016) ) from models and experiments converge nicely (Fig. 3b).…”

mentioning

confidence: 76%

“…The aqueous NaCl solution droplet could participate in many atmospheric processes, such as phase transition, cloud activation, ice crystallization, long-range transport and chemical aging (Martin, 2000;Finlayson-Pitts, 2003;Ghorai et al, 2014;Wagner et al, 2015;Chen et al, 2016). To better understand these processes, the concentration-dependent surface tension of aqueous NaCl solution (σ , ) is essential to determine the equilibrium between NaCl solution droplet and water vapor (Jarvis and Scheiman, 1968;Dutcher et 5 al., 2010).…”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Simulation of the Surface Tension of Aqueous Sodium Chloride: from Dilute to Highly Supersaturated Solutions and Molten Salt

Wang¹,

Chen²,

Binder³

et al. 2017

Preprint

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“…Two specialized chambers at KIT were used in this campaign: the Aerosols Interaction and Dynamics in the Atmosphere (AIDA) chamber and the Aerosol Preparation and Characterization (APC) chamber. The AIDA chamber can be used to simulate atmospheric conditions that give rise to cloud particle formation and growth and has been used in many previous campaigns and instrument intercomparisons to examine the ice nucleating ability of various aerosols (Amato et al, 2015;Schnaiter et al, 2016;Wagner et al, 2015;DeMott et al, 2011). The AIDA chamber is a threestory, 84 m 3 volume chamber that uses adiabatic expansion to simulate the atmospheric conditions required for ice nucleation to occur.…”

Section: Data Collection During Fin-02mentioning

confidence: 99%

Using depolarization to quantify ice nucleating particle concentrations: a new method

Zenker

Collier

et al. 2017

Atmos. Meas. Tech.

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Abstract. We have developed a new method to determine ice nucleating particle (INP) concentrations observed by the Texas A&M University continuous flow diffusion chamber (CFDC) under a wide range of operating conditions. In this study, we evaluate differences in particle optical properties detected by the Cloud and Aerosol Spectrometer with POLarization (CASPOL) to differentiate between ice crystals, droplets, and aerosols. The depolarization signal from the CASPOL instrument is used to determine the occurrence of water droplet breakthrough (WDBT) conditions in the CFDC. The standard procedure for determining INP concentration is to count all particles that have grown beyond a nominal size cutoff as ice crystals. During WDBT this procedure overestimates INP concentration, because large droplets are miscounted as ice crystals. Here we design a new analysis method based on depolarization ratio that can extend the range of operating conditions of the CFDC. The method agrees reasonably well with the traditional method under non-WDBT conditions with a mean percent error of ±32.1 %. Additionally, a comparison with the Colorado State University CFDC shows that the new analysis method can be used reliably during WDBT conditions.

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Crystallization and immersion freezing ability of oxalic and succinic acid in multicomponent aqueous organic aerosol particles

Cited by 14 publications

References 49 publications

Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds

Cloud chamber experiments on the origin of ice crystal complexity in cirrus clouds

Molecular Dynamics Simulation of the Surface Tension of Aqueous Sodium Chloride: from Dilute to Highly Supersaturated Solutions and Molten Salt

Using depolarization to quantify ice nucleating particle concentrations: a new method

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