Surface tension of Rax cloud water and its relation to the concentration of organic material

Hitzenberger, R.; Berner, A.; Kasper-Giebl, Anne; Löflund, M; Puxbaum, Hans

doi:10.1029/2002jd002506

Cited by 33 publications

(18 citation statements)

References 36 publications

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“…In addition to their influence on the amount of mass in solution, organics might also change the surface tension of the particles. It has been shown that this effect might be small for short‐chain mono‐ and dicarboxylic acids [ Shulman et al , 1996] but is more distinct in the presence of high molecular weight acids with many functional groups [ Facchini et al , 2000; Hitzenberger et al , 2002]. These compounds reduce the surface tension, leading to enhanced drop growth rates [ Gorbunov et al , 1998; Nenes et al , 2002].…”

Section: Introductionmentioning

confidence: 99%

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

Ervens

2004

J. Geophys. Res.

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[1] We estimate the effect of selected small organic species, present in aerosol particles as internal mixtures with sulphate, on cloud microphysical properties using a numerical model. The initial aerosol compositions were motivated by a prior model study in which it was shown that under certain conditions, small dicarboxylic acids, primarily oxalic and glutaric acids, can be efficiently formed via aqueous chemical processes in clouds and remain in the aerosol fraction upon drop evaporation. The simulations performed here separate the effects of the growth in particle mass via in-cloud oxidation from the change in composition of the resulting aerosol. Although the sulphate/organic mixed particles are somewhat less hygroscopic than pure ammonium sulphate, their activity as cloud condensation nuclei in a simulated constant updraft is similar, and the main influence of prior cloud processing of particles arises from the change in total mass and size distribution. We also performed a separate series of simulations initialized with an aerosol consisting of 90% adipic acid/10% ammonium sulphate, chosen to represent a lower limit on the mixed-particle hygroscopic behavior. If only the reduced solubility of the mixture, relative to that of pure sulphate aerosol, is considered, the drop number concentration is suppressed by up to 50%, depending on the choice of initial conditions. However, the suppression of surface tension due to the presence of the organics, modeled using two different approaches, leads to a compensating effect that can result in little net change to the drop concentration relative to that for the pure sulphate aerosol.

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Section: Introductionmentioning

confidence: 99%

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

Ervens

2004

J. Geophys. Res.

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“…Simple theory indicates that S c is anticorrelated with the number of soluble ions in the particle and, hence, is dependent on particle composition and size. Changes in critical supersaturation and droplet growth characteristics may be introduced by partly soluble substances, soluble gases, and surface tension effects [ Shulman et al , 1996; Hitzenberger et al , 2002; Charlson et al , 2001].…”

Section: Introductionmentioning

confidence: 99%

Nitrogenated organic aerosols as cloud condensation nuclei

Twohy

Anderson

Crozier

2005

Geophysical Research Letters

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One important role of anthropogenic aerosol particles is their influence on climate by acting as cloud condensation nuclei. However, these particles are diverse in composition and mixing state, and our knowledge of which particle types act as cloud condensation nuclei is incomplete. Here we present direct measurements of individual organic particles that nucleated cloud droplets in the atmosphere. These results indicate that nitrogenated organic aerosol particles can act as cloud condensation nuclei without being mixed with inorganic material, and thus influence climate through cloud formation.

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“…The correction factor depends strongly on the particle size and the surface tension of the considered aerosol particle/droplet. The surface tension varies with the composition of the aerosol particle (Facchini et al, 1999;Hitzenberger et al, 2002;Ervens et al, 2004Ervens et al, , 2005; e.g., it is increased by dissolved salts (Seinfeld and Pandis, 2006) and decreased by organic compounds (Facchini et al, 1999;Ervens et al, 2005). However, for the estimation of the vapor pressures for the partitioning compounds a group contribution method (EVAPORATION, Compernolle et al, 2011) is applied in this study.…”

Section: Limitations Of the Present Studiesmentioning

confidence: 99%

Kinetic modeling studies of SOA formation from <i>α</i>-pinene ozonolysis

et al. 2017

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Abstract. This paper describes the implementation of a kinetic gas-particle partitioning approach used for the simulation of secondary organic aerosol (SOA) formation within the SPectral Aerosol Cloud Chemistry Interaction Model (SPACCIM). The kinetic partitioning considers the diffusion of organic compounds into aerosol particles and the subsequent chemical reactions in the particle phase. The basic kinetic partitioning approach is modified by the implementation of chemical backward reaction of the solute within the particle phase as well as a composition-dependent particle-phase bulk diffusion coefficient. The adapted gasphase chemistry mechanism for α-pinene oxidation has been updated due to the recent findings related to the formation of highly oxidized multifunctional organic compounds (HOMs). Experimental results from a LEAK (Leipziger Aerosolkammer) chamber study for α-pinene ozonolysis were compared with the model results describing this reaction system.The performed model studies reveal that the particle-phase bulk diffusion coefficient and the particle-phase reactivity are key parameters for SOA formation. Using the same particlephase reactivity for both cases, we find that liquid particles with higher particle-phase bulk diffusion coefficients have 310 times more organic material formed in the particle phase compared to higher viscous semi-solid particles with lower particle-phase bulk diffusion coefficients. The model results demonstrate that, even with a moderate particle-phase reactivity, about 61 % of the modeled organic mass consists of reaction products that are formed in the liquid particles.This finding emphasizes the potential role of SOA processing. Moreover, the initial organic aerosol mass concentration and the particle radius are of minor importance for the process of SOA formation in liquid particles. A sensitivity study shows that a 22-fold increase in particle size merely leads to a SOA increase of less than 10 %.Due to two additional implementations, allowing backward reactions in the particle phase and considering a composition-dependent particle-phase bulk diffusion coefficient, the potential overprediction of the SOA mass with the basic kinetic approach is reduced by about 40 %. HOMs are an important compound group in the early stage of SOA formation because they contribute up to 65 % of the total SOA mass at this stage. HOMs also induce further SOA formation by providing an absorptive medium for SVOCs (semivolatile organic compounds). This process contributes about 27 % of the total organic mass. The model results are very similar to the LEAK chamber results. Overall, the sensitivity studies demonstrate that the particle reactivity and the particle-phase bulk diffusion require a better characterization in order to improve the current model implementations and to validate the assumptions made from the chamber simulations. The successful implementation and testing of the current kinetic gas-particle partitioning approach in a box model framework will allow further applications in a ...

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Surface tension of Rax cloud water and its relation to the concentration of organic material

Cited by 33 publications

References 36 publications

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

Nitrogenated organic aerosols as cloud condensation nuclei

Kinetic modeling studies of SOA formation from <i>α</i>-pinene ozonolysis

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Surface tension of Rax cloud water and its relation to the concentration of organic material

Cited by 33 publications

References 36 publications

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

A modeling study of aqueous production of dicarboxylic acids: 2. Implications for cloud microphysics

Nitrogenated organic aerosols as cloud condensation nuclei

Kinetic modeling studies of SOA formation from &lt;i&gt;α&lt;/i&gt;-pinene ozonolysis

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Kinetic modeling studies of SOA formation from <i>α</i>-pinene ozonolysis