Hygroscopic growth and measured and modeled critical super‐saturations of an atmospheric HULIS sample

Wex, Heike; Hennig, T.; Salma, Imre; Ocskay, R.; Kiselev, Alexei; Henning, S.; Maßling, Andreas; Wiedensohler, A.; Stratmann, Frank

doi:10.1029/2006gl028260

Cited by 103 publications

(126 citation statements)

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“…A detailed discussion of the SPE procedure, including column selection and performance, can be found in Varga et al (2001). In this work the ISOM fraction is hereafter referred to as HULIS, in consistency with literature (Kiss et al, 2005;Wex et al, 2007;Ziese et al, 2008). The extraction procedure of the HULIS was identical for the SMOCC and K-puszta samples.…”

Section: Extractionmentioning

confidence: 77%

“…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).…”

mentioning

confidence: 99%

“…They have produced quite diverse results due to the vast number of species that can fall under the HULIS definition; since HULIS is ultimately defined by the separation method used in the isolation procedure of the sample. Gysel et al (2004), Dinar et al (2006), Wex et al (2007) and Ziese et al (2008) all determined the hygroscopic properties of isolated HULIS samples, measuring hygroscopic growth factors between 1.05 and 1.24 at 90% RH.…”

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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: Extractionmentioning

confidence: 77%

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confidence: 99%

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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

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“…the minimum S required for the particles of a certain size to activate into cloud drops (e.g. Svenningsson et al, 1992;Rissler et al, 2005;Khvorostyanov and Curry, 2007;Wex et al, 2007). One such approach is the hygroscopicity parameter κ, also known as "kappa", a unitless number describing the cloud condensation nucleus activity (Petters and Kreidenweis, 2007).…”

Section: Introductionmentioning

confidence: 99%

A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network

et al. 2015

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Published by Copernicus Publications on behalf of the European Geosciences Union. M. Paramonov et al.: A synthesis of CCNC measurements within the EUCAARI networkAbstract. Cloud condensation nuclei counter (CCNC) measurements performed at 14 locations around the world within the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) framework have been analysed and discussed with respect to the cloud condensation nuclei (CCN) activation and hygroscopic properties of the atmospheric aerosol. The annual mean ratio of activated cloud condensation nuclei (N CCN ) to the total number concentration of particles (N CN ), known as the activated fraction A, shows a similar functional dependence on supersaturation S at many locations -exceptions to this being certain marine locations, a free troposphere site and background sites in south-west Germany and northern Finland. The use of total number concentration of particles above 50 and 100 nm diameter when calculating the activated fractions (A 50 and A 100 , respectively) renders a much more stable dependence of A on S; A 50 and A 100 also reveal the effect of the size distribution on CCN activation. With respect to chemical composition, it was found that the hygroscopicity of aerosol particles as a function of size differs among locations. The hygroscopicity parameter κ decreased with an increasing size at a continental site in south-west Germany and fluctuated without any particular size dependence across the observed size range in the remote tropical North Atlantic and rural central Hungary. At all other locations κ increased with size. In fact, in Hyytiälä, Vavihill, Jungfraujoch and Pallas the difference in hygroscopicity between Aitken and accumulation mode aerosol was statistically significant at the 5 % significance level. In a boreal environment the assumption of a size-independent κ can lead to a potentially substantial overestimation of N CCN at S levels above 0.6 %. The same is true for other locations where κ was found to increase with size. While detailed information about aerosol hygroscopicity can significantly improve the prediction of N CCN , total aerosol number concentration and aerosol size distribution remain more important parameters. The seasonal and diurnal patterns of CCN activation and hygroscopic properties vary among three long-term locations, highlighting the spatial and temporal variability of potential aerosol-cloud interactions in various environments.

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“…Therefore, one-parameter approximations were developed (e.g. Petters and Kreidenweis, 2007;Wex et al, 2007) which are applicable for the description of particle hygroscopic growth as well as activation properties. Oneparameter approaches are also well suited as a simple mea- Fig.…”

Section: Introductionmentioning

confidence: 99%

Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010

et al. 2014

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Abstract. Within the framework of the "Hill Cap Cloud Thuringia 2010" (HCCT-2010) international cloud experiment, the influence of cloud processing on the activation properties of ambient aerosol particles was investigated. Particles were probed upwind and downwind of an orographic cap cloud on Mt Schmücke, which is part of a large mountain ridge in Thuringia, Germany. The activation properties of the particles were investigated by means of size-segregated cloud condensation nuclei (CCN) measurements at 3 to 4 different supersaturations. The observed CCN spectra together with the total particle spectra were used to calculate the hygroscopicity parameter κ for the upwind and downwind stations. The upwind and downwind critical diameters and κ values were then compared for defined cloud events (FCE) and noncloud events (NCE). Cloud processing was found to increase the hygroscopicity of the aerosol particles significantly, with an average increase in κ of 50 %. Mass spectrometry analysis and isotopic analysis of the particles suggest that the observed increase in the hygroscopicity of the cloud-processed particles is due to an enrichment of sulfate and possibly also nitrate in the particle phase.

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Hygroscopic growth and measured and modeled critical super‐saturations of an atmospheric HULIS sample

Cited by 103 publications

References 24 publications

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

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

A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network

Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010

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