Bistable effect of organic enrichment on sea spray radiative properties

Vaishya, Aditya; Ovadnevaitė, Jurgita; Białek, Jakub; Jennings, S. G.; Čeburnis, Darius; O’Dowd, Colin

doi:10.1002/2013gl058452

Cited by 26 publications

(31 citation statements)

References 36 publications

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“…The maximum in the OVF value and the corresponding depression of the GF on July 17 is highly corroborated with the trend of the values obtained with the model system shown in Table 1 which shows that an increase in the OVF results in a lower GF at RH = 80%. As previously seen in field studies, [42][43][44] the reduction in the hygroscopicity of individual SSA particles highlights the role of organics in the interaction of individual atmospheric SSAs with water vapor. The variable responses of authentic SSA particles to water vapor underline the increasing level of chemical complexity 34,45 that can only be addressed in single particle-level studies that are otherwise obscured when probed using ensemble methods.…”

Section: Resultssupporting

confidence: 60%

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

Estillore

Morris

et al. 2017

Phys. Chem. Chem. Phys.

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Individual airborne sea spray aerosol (SSA) particles show diversity in their morphologies and water uptake properties that are highly dependent on the biological, chemical, and physical processes within the sea subsurface and the sea surface microlayer. In this study, hygroscopicity data for model systems of organic compounds of marine origin mixed with NaCl are compared to data for authentic SSA samples collected in an ocean-atmosphere facility providing insights into the SSA particle growth, phase transitions and interactions with water vapor in the atmosphere. In particular, we combine single particle morphology analyses using atomic force microscopy (AFM) with hygroscopic growth measurements in order to provide important insights into particle hygroscopicity and the surface microstructure. For model systems, a range of simple and complex carbohydrates were studied including glucose, maltose, sucrose, laminarin, sodium alginate, and lipopolysaccharides. The measured hygroscopic growth was compared with predictions from the Extended-Aerosol Inorganics Model (E-AIM). It is shown here that the E-AIM model describes well the deliquescence transition and hygroscopic growth at low mass ratios but not as well for high ratios, most likely due to a high organic volume fraction. AFM imaging reveals that the equilibrium morphology of these single-component organic particles is amorphous. When NaCl is mixed with the organics, the particles adopt a core-shell morphology with a cubic NaCl core and the organics forming a shell similar to what is observed for the authentic SSA samples. The observation of such core-shell morphologies is found to be highly dependent on the salt to organic ratio and varies depending on the nature and solubility of the organic component. Additionally, single particle organic volume fraction AFM analysis of NaCl : glucose and NaCl : laminarin mixtures shows that the ratio of salt to organics in solution does not correspond exactly for individual particles -showing diversity within the ensemble of particles produced even for a simple two component system. IntroductionCovering a substantial area of the Earth's surface, the ocean serves as one of the main sources of particulate matter in the atmosphere. Sea spray aerosols (SSAs) are generated by breaking waves in marine environments and account for the largest atmospheric aerosol flux. it has a profound influence on the composition of aerosol particles as they escape across the interface. The SSML is a rich mixture of organic compounds such as fatty acids, fatty alcohols, sterols, carbohydrates, proteins and more complex colloids and aggregates exuded by phytoplankton such as lipopolysaccharides (LPSs). 11,12In the authentic samples collected from a pristine region of the Pacific Ocean, Gagosian and coworkers 13 detected alcohols, fatty acid salts and esters as specific tracers of ocean-derived organic compounds in atmospheric aerosols. The organic compounds include saccharides, fatty acids, and a few other organic classes. 13 Progress in analytic...

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Section: Resultssupporting

confidence: 60%

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

Estillore

Morris

et al. 2017

Phys. Chem. Chem. Phys.

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“…Journal of Geophysical Research: Atmospheres may have caused the negative values. However, the possibility that the κ org, which is defined by (κ t À ε inorg κ inorg )/κ inorg , was really negative should not be ruled out, because the additivity assumption of water uptake (equation (5)) does not necessarily hold for some organic/inorganic mixtures (Chan & Chan, 2003;Vaishya et al, 2013).…”

Section: 1029/2017jd027292mentioning

confidence: 99%

Hygroscopicity of Organic Aerosols and Their Contributions to CCN Concentrations Over a Midlatitude Forest in Japan

et al. 2018

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The formation of biogenic secondary organic aerosols (BSOAs) in forest environments is potentially important to cloud formation via changes of the cloud condensation nuclei (CCN) activity of aerosols. In this study, the CCN activation of submicrometer aerosols and their chemical compositions and size distributions were measured at a midlatitude forest site in Japan during the summer of 2014 to assess the hygroscopicity of the organic aerosols and their contributions to the local CCN concentrations. The mean number concentrations of the condensation nuclei and CCN at supersaturation (SS) conditions of 0.11–0.80% were 1,238 and 166–740 cm−3, respectively. Organic aerosols and sulfate dominated the submicrometer aerosol mass concentrations. The particle hygroscopicity increased with increases in particle diameters. The hygroscopicity parameter for the organics, κorg, was positively correlated with the atomic O to C ratio. The product of κorg and the volume fraction of OA was 0.12, accounting for 38% of the water uptake by aerosol particles. The hygroscopicity parameter of the locally formed fresh BSOA was estimated to be 0.09. The contribution of OA to the CCN number concentration, which was assessed by subtracting the CCN concentration of the hypothetical inorganic aerosols from that of the ambient aerosols, was 50–182 cm−3 for the SS range of 0.11–0.80%. The increase of the CCN number concentrations per 1‐μg/m3 increase of the BSOA was 23–299 cm−3 at 0.11–0.80% SS. The contribution of the BSOA to the CCN number concentration can be enhanced by new particle formation.

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“…In particular, the surface film can affect the process of cloud condensation nuclei formation and aerosol growth to climatically relevant sizes (Andrews and Larson, 1993;Chuang, 2003). Organic compounds can also change the amount of light scattered by inorganic particles (Dall'Osto et al, 2010;Fierz-Schmidhauser et al, 2010;Vaishya et al, 2013). Marine primary organic aerosol (POA) can cause large local increases in the cloud condensation nuclei concentration by 15 % to more than 100 % Ovadnevaite et al, 2011b), and the ambient mass concentration and organic mass fraction of sea-spray aerosol are related to surface ocean biological activity.…”

Section: Introductionmentioning

confidence: 99%

The effect of low solubility organic acids on the hygroscopicity of sodium halide aerosols

et al. 2014

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Abstract. In order to accurately assess the influence of fatty acids on the hygroscopic and other physicochemical properties of sea salt aerosols, hexanoic, octanoic or lauric acid together with sodium halide salts (NaCl, NaBr and NaI) have been chosen to be investigated in this study. The hygroscopic properties of sodium halide sub-micrometre particles covered with organic acids have been examined by Fourier-transform infrared spectroscopy in an aerosol flow cell. Covered particles were generated by flowing atomized sodium halide particles (either dry or aqueous) through a heated oven containing the gaseous acid. The obtained results indicate that gaseous organic acids easily nucleate onto dry and aqueous sodium halide particles. On the other hand, scanning electron microscopy (SEM) images indicate that lauric acid coating on NaCl particles makes them to aggregate in small clusters. The hygroscopic behaviour of covered sodium halide particles in deliquescence mode shows different features with the exchange of the halide ion, whereas the organic surfactant has little effect in NaBr particles, NaCl and NaI covered particles experience appreciable shifts in their deliquescence relative humidities, with different trends observed for each of the acids studied. In efflorescence mode, the overall effect of the organic covering is to retard the loss of water in the particles. It has been observed that the presence of gaseous water in heterogeneously nucleated particles tends to displace the cover of hexanoic acid to energetically stabilize the system.

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Bistable effect of organic enrichment on sea spray radiative properties

Cited by 26 publications

References 36 publications

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

Linking hygroscopicity and the surface microstructure of model inorganic salts, simple and complex carbohydrates, and authentic sea spray aerosol particles

Hygroscopicity of Organic Aerosols and Their Contributions to CCN Concentrations Over a Midlatitude Forest in Japan

The effect of low solubility organic acids on the hygroscopicity of sodium halide aerosols

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