Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events

Dusek, U.; Frank, Göran; Curtius, Joachim; Drewnick, Frank; Schneider, Johannes; Kürten, Andreas; Rose, D.; Andreae, Meinrat O.; Borrmann, Stephan; Pöschl, Ulrich

doi:10.1029/2009gl040930

Cited by 158 publications

(163 citation statements)

References 35 publications

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“…This is in agreement with the average κ of 0.08 ± 0.03 for the BSOA from Mediterranen and Boreal tree species (Bucholz, 2010) and with results of CCN field measurements of SOA particles in tropical as well as in mid-latitude environments Dusek et al, 2010;. With regard to the CCN properties of organic and mixed organic-inorganic aerosol particles, measurement data analyses and sensitivity studies using the new hygroscopicity distribution concept and cloud parcel model suggest that a simple κ-Köhler model approach can be used for efficient approximation and prediction of CCN concentrations in the atmosphere Reutter et al, 2009;Pöschl et al, 2010;Su et al, 2010).…”

Section: Methodssupporting

confidence: 76%

“…The SOA becomes more CCN active in all cases due to continued reactions with the OH radical (Engelhart et al, 2008;Asa-Awuku et al, 2009). The water uptake of organics could be modeled using kappa-Köhler theory following Petters and Kreidenweis (2007) applying a kappa value of ∼0.1, which is consistent with other recent laboratory and field studies of (secondary) organic aerosol hygroscopicity and CCN activity Shinozuka et al, 2009;King et al, 2010;Dusek et al, 2010;Roberts et al, 2010;Pöschl et al, 2010, 2011, andreferences therein).…”

Section: Ccn Formation and Cloud Droplet Activationsupporting

confidence: 64%

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General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

et al. 2011

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Abstract. In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical properties of aerosol particles over Europe, (b) comprehensive aerosol measurements in four developing countries, (c) a database of airborne measurements of aerosols and clouds over Europe during May 2008, (d) comprehensive modeling tools to study aerosol processes fron nano to global scale and their effects on climate and air quality. In addition a new Pan-European aerosol emissions inventory was developed and evaluated, a new cluster spectrometer was built and tested in the field and several new aerosol parameterizations and computations modules for chemical transport and global climate models were developed and evaluated. These achievements and related studies have substantially improved our understanding and reduced the uncertainties of aerosol radiative forcing and air quality-climate interactions. The EUCAARI results can be utilized in European and global environmental policy to assess the aerosol impacts and the corresponding abatement strategies.

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Section: Methodssupporting

confidence: 76%

Section: Ccn Formation and Cloud Droplet Activationsupporting

confidence: 64%

General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

et al. 2011

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“…in which κ org and κ inorg are the hygroscopicity parameters for pure organic and inorganic substances (κ org = 0.1 and κ inorg = 0.6) Dusek et al, 2010;Rose et al, 2011). For the average AMS-derived hygroscopicity parameter we obtained κ AMS = 0.45.…”

Section: L Krüger Et Al: Assessment Of Cloud Supersaturation Appmentioning

confidence: 96%

Assessment of cloud supersaturation by size-resolved aerosol particle and cloud condensation nuclei (CCN) measurements

et al. 2014

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Abstract. In this study we show how size-resolved measurements of aerosol particles and cloud condensation nuclei (CCN) can be used to characterize the supersaturation of water vapor in a cloud. The method was developed and applied during the ACRIDICON-Zugspitze campaign (17 September to 4 October 2012) at the high-Alpine research station Schneefernerhaus (German Alps, 2650 m a.s.l.). Number size distributions of total and interstitial aerosol particles were measured with a scanning mobility particle sizer (SMPS), and size-resolved CCN efficiency spectra were recorded with a CCN counter system operated at different supersaturation levels.During the evolution of a cloud, aerosol particles are exposed to different supersaturation levels. We outline and compare different estimates for the lower and upper bounds (S low , S high ) and the average value (S avg ) of peak supersaturation encountered by the particles in the cloud. A major advantage of the derivation of S low and S avg from size-resolved CCN efficiency spectra is that it does not require the specific knowledge or assumptions about aerosol hygroscopicity that are needed to derive estimates of S low , S high , and S avg from aerosol size distribution data. For the investigated cloud event, we derived S low ≈ 0.07-0.25 %, S high ≈ 0.86-1.31 % and S avg ≈ 0.42-0.68 %.

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“…We assign the following individual hygroscopicity parameters: sulphate (0.61, assuming ammonium sulphate), sea salt (1.28), black carbon (0.0), and particulate organic matter (0.1). Whilst there is uncertainty associated with the hygroscopicity parameter for organic material in the atmosphere due to the wide range of solubilities observed, κ values close to 0.1 have been reported for secondary organic components (Engelhart et al, 2008(Engelhart et al, , 2011Gunthe et al, 2009;Dusek et al, 2010;King et al, 2010), and the entire organic fraction (Wang et al, 2008;Chang et al, 2010). We calculate CCN concentrations at a supersaturation of 0.2 %, which is equivalent to an activation dry diameter of approximately 80 nm (assuming a composition of pure ammonium sulphate).…”

Section: Calculation Of Ccn Concentrationsmentioning

confidence: 99%

The direct and indirect radiative effects of biogenic secondary organic aerosol

et al. 2014

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Abstract. We use a global aerosol microphysics model in combination with an offline radiative transfer model to quantify the radiative effect of biogenic secondary organic aerosol (SOA) in the present-day atmosphere. Through its role in particle growth and ageing, the presence of biogenic SOA increases the global annual mean concentration of cloud condensation nuclei (CCN; at 0.2 % supersaturation) by 3.6-21.1 %, depending upon the yield of SOA production from biogenic volatile organic compounds (BVOCs), and the nature and treatment of concurrent primary carbonaceous emissions. This increase in CCN causes a rise in global annual mean cloud droplet number concentration (CDNC) of 1.9-5.2 %, and a global mean first aerosol indirect effect (AIE) of between +0.01 W m −2 and −0.12 W m −2 . The radiative impact of biogenic SOA is far greater when biogenic oxidation products also contribute to the very early stages of new particle formation; using two organically mediated mechanisms for new particle formation, we simulate global annual mean first AIEs of −0.22 W m −2 and −0.77 W m −2 . The inclusion of biogenic SOA substantially improves the simulated seasonal cycle in the concentration of CCN-sized particles observed at three forested sites. The best correlation is found when the organically mediated nucleation mechanisms are applied, suggesting that the first AIE of biogenic SOA could be as large as −0.77 W m −2 . The radiative impact of SOA is sensitive to the presence of anthropogenic emissions. Lower background aerosol concentrations simulated with anthropogenic emissions from 1750 give rise to a greater fractional CCN increase and a more substantial first AIE from biogenic SOA. Consequently, the anthropogenic indirect radiative forcing between 1750 and the present day is sensitive to assumptions about the amount and role of biogenic SOA. We also calculate an annual global mean direct radiative effect of between −0.08 W m −2 and −0.78 W m −2 in the present day, with uncertainty in the amount of SOA produced from the oxidation of BVOCs accounting for most of this range.

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Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events

Cited by 158 publications

References 35 publications

General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

Assessment of cloud supersaturation by size-resolved aerosol particle and cloud condensation nuclei (CCN) measurements

The direct and indirect radiative effects of biogenic secondary organic aerosol

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