Surfactant properties of atmospheric and model humic‐like substances (HULIS)

Taraniuk, I.; Graber, Ellen R.; Kostinski, A. B.; Rudich, Yinon

doi:10.1029/2007gl029576

Cited by 66 publications

(90 citation statements)

References 34 publications

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“…Note that ρ ion is given using the fitted surface tensions while in Table 3 the corresponding numbers for the κ R model are listed using the surface tension of pure water. (Ziese et al, 2008) 9.51E−06 E2 5434 HULIS, second sample, Budapest, Hungary (Ziese et al, 2008) 2.14E−05 E2 5268 HULIS, LBO night, Rehovot, Israel (Ziese et al, 2008) 3.51E−05 E2 3516 HULIS, LBO day, Rehovot, Israel (Ziese et al, 2008) 3.57E−05 E2 7317 HULIS, 3WSFA, Rehovot, Israel (Ziese et al, 2008) 2.68E−05 E2 13 269 surface tension and, thereby, reduce the critical supersaturation Taraniuk et al, 2007;Wex et al, 2007). For a surface tension of water, both models overestimate the critical supersaturation by a factor of ∼2.…”

Section: Comparison Ccn Measurements and Model Resultsmentioning

confidence: 99%

“…Of this organic fraction, about 10-60% has been found to be water soluble organic carbon (WSOC) (Krivacsy et al, 2001;Kleefeld et al, 2002). Until now, the knowledge about the hygroscopic growth and CCN properties of the multitude of water soluble organic compounds found in aerosol particles has been very limited (Kanakidou et al, 2005;Dinar et al, 2006Dinar et al, , 2007Taraniuk et al, 2007;Wex et al, 2007).…”

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confidence: 99%

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Hygroscopic properties of Amazonian biomass burning and European background HULIS and investigation of their effects on surface tension with two models linking H-TDMA to CCNC data

et al. 2010

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Abstract. HUmic-LIke Substances (HULIS) have been identified as major contributors to the organic carbon in atmospheric aerosol. The term "HULIS" is used to describe the organic material found in aerosol particles that resembles the humic organic material in rivers and sea water and in soils. In this study, two sets of filter samples from atmospheric aerosols were collected at different sites. One set of samples was collected at the K-puszta rural site in Hungary, about 80 km SE of Budapest, and a second was collected at a site in Rondônia, Amazonia, Brazil, during the Large-Scale Biosphere-Atmosphere Experiment in Amazonia -Smoke Aerosols, Clouds, Rainfall and Climate (LBA-SMOCC) biomass burning season experiment. HULIS were extracted from the samples and their hygroscopic properties were studied using a Hygroscopicity Tandem Differential Mobility Analyzer (H-TDMA) at relative humidity (RH) <100%, and a cloud condensation nucleus counter (CCNC) at RH >100%. The H-TDMA measurements were carried out at a dry diameter of 100 nm and for RH ranging from 30 to 98%. At 90% RH the HULIS samples showed diameter Correspondence to: E. O. Fors (erik.fors@nuclear.lu.se) growth factors between 1.04 and 1.07, reaching values of 1.4 at 98% RH. The cloud nucleating properties of the two sets of aerosol samples were analysed using two types of thermal static cloud condensation nucleus counters. Two different parameterization models were applied to investigate the potential effect of HULIS surface activity, both yielding similar results. For the K-puszta winter HULIS sample, the surface tension at the point of activation was estimated to be lowered by between 34% (47.7 mN/m) and 31% (50.3 mN/m) for dry sizes between 50 and 120 nm in comparison to pure water. A moderate lowering was also observed for the entire water soluble aerosol sample, including both organic and inorganic compounds, where the surface tension was decreased by between 2% (71.2 mN/m) and 13% (63.3 mN/m).

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Section: Comparison Ccn Measurements and Model Resultsmentioning

confidence: 99%

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confidence: 99%

Hygroscopic properties of Amazonian biomass burning and European background HULIS and investigation of their effects on surface tension with two models linking H-TDMA to CCNC data

et al. 2010

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“…It has been observed that a 10% change in the effective SS can cause a ∼40% change in calculations of the critical diameter. The effect of surfactants such as humic-like substances further depends on their dissolution and diffusion rates [Taraniuk et al, 2007]. Several other factors contribute to potential uncertainties in , some of which have been listed in previous studies [Chang et al, 2010].…”

Section: Aerosol Hygroscopicity and Degree Of Oxygenationmentioning

confidence: 99%

CCN closure study: Effects of aerosol chemical composition and mixing state

Bhattu

Tripathi

2015

JGR Atmospheres

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This study presents a detailed cloud condensation nuclei (CCN) closure study that investigates the effects of chemical composition (bulk and size resolved) and mixing state (internal and external) on CCN activity of aerosols. Measurements of the chemical composition, aerosol size distribution, total number concentration, and CCN concentration at supersaturation (SS = 0.2–1.0%) were performed during the winter season in Kanpur, India. Among the two cases considered here, better closure results are obtained for case 1 (low total aerosol loading, 49.54 ± 26.42 μg m−3, and high O:C ratio, 0.61 ±0.07) compared to case 2 (high total aerosol loading, 101.05 ± 18.73 μg m−3, and low O:C ratio, 0.42 ±0.06), with a maximum reduction of 3–81% in CCN overprediction for all depleted SS values (0.18–0.60%). Including the assumption that less volatile oxidized organic aerosols represent the soluble organic fraction reduced the overprediction to at most 40% and 129% in the internal and external mixing scenarios, respectively. At higher depleted SS values (0.34–0.60%), size‐resolved chemical composition with an internal mixing state performed well in CCN closure among all organic solubility scenarios. However, at a lower depleted SS value (0.18%), closure is found to be more sensitive to both the chemical composition and mixing state of aerosols. At higher SS values, information on the solubility of organics and size‐resolved chemical composition is required for accurate CCN predictions, whereas at lower SS values, information on the mixing state in addition to the solubility of organics and size‐resolved chemical composition is required. Overall, κtotal values are observed to be independent of the O:C ratio [κtotal= (0.36 ±0.01) × O:C − (0.03 ± 0.01)] in the range of 0.2

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“…As yet, these isolation and characterization approaches have not been applied to dust, although hulis and BC in aerosol have been widely studied in the past (Havers et al, 1998;Krivácsy et al, 2000;Dinar et al, 2006;Taraniuk et al, 2007;Kirchstetter et al, 2008;Dutkiewicz et al, 2009;Sýkorová et al, 2009). In the present study, we isolated HAs, kerogen and black carbon (KB) and BC from dust collected in Guangzhou, China, and then characterized the chemical composition of the fractionated macromolecule organic matter using elementary analysis (EA), X-ray diffraction (XRD), organic petrographic examination (OPE), scanning electron microscopy (SEM), solid state 13 C cross-polarization and magic angle spinning nuclear magnetic resonance spectroscopy ( 13 C-CP/MAS NMR) and Fourier transformed infrared spectroscopy (FTIR).…”

Section: Introductionmentioning

confidence: 99%