Cloud condensation nuclei from the activation with ozone of soot particles sampled from a kerosene diffusion flame

Grimonprez, Symphorien; Faccinetto, Alessandro; Batut, Sébastien; Wu, Junteng; Desgroux, Pascale; Petitprez, Denis

doi:10.1080/02786826.2018.1472367

Cited by 25 publications

(51 citation statements)

References 82 publications

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“…The general finding agrees with literature results underlining the applicability of the CSTR-approach. Nevertheless, the activation supersaturation in our experiments is significantly lower at the same O3-10 exposures compared to results obtained in other experimental setups (Grimonprez et al, 2018;Lambe et al, 2015). The soot rich in OC (CBW) demanded 2 to 4 times less aging time (tact = 3 -6 h at 1.4 % SSact) than soot lean in OC (CBK, tact = 12 h at 1.4 % SSact).…”

Section: Resultscontrasting

confidence: 54%

“…In addition, particle diameters and particle compositions vary across studies. If the cumulative O3-exposure, the product of the O3-concentration and the exposure time, is taken as a metric for comparison, 100 nm diameter CBK particles in our study (SSact = 1.6 % after 4.9 × 10 16 molec•s•cm -3 O3-exposure) show CCNactivity within the same order of magnitude as 150 nm kerosene diffusion flame soot particles investigated by Grimonprez et al, (2018) (SScrit = 1.4 % after 10 × 10 16 molec•s•cm -3 O3-exposure) and as 222 nm ethylene premix flame soot particle 30 (SScrit = 1.5 % after 5 × 10 16 molec•s•cm -3 O3-exposure; Lambe et al, 2015).…”

Section: Ccn-activitymentioning

confidence: 69%

“…Despite these efforts, no CCN activation at atmospheric ozone 5 concentration and atmospherically relevant SS has been reported to the authors' knowledge. However, in the range from 1200 ppb to 20,000 ppb ozone a significant increase in CCN activity of soot particles was reported for SS above 0.8 % for exposure times between 100 s and-2 h, which should correspond to atmospheric aging times of up to 3.5 days (Friedman et al, 2011;Grimonprez et al, 2018;Lambe et al, 2015). Contrary to the agreement regarding the linearity of aging and OHexposure within the scientific community (Renbaum and Smith, 2011), there is no such consensus concerning ageing and 10 ozone exposure.…”

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confidence: 99%

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Impact of Isolated Atmospheric Aging processes on the Cloud Condensation Nuclei-activation of Soot Particles

Friebel¹,

Lobo²,

Neubauer³

et al. 2019

Preprint

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Abstract. The largest contributors to the uncertainty in assessing the anthropogenic contribution in radiative forcing are the direct and indirect effects of aerosol particles on the Earth's radiative budget. Soot particles are of special interest since their properties can change significantly due to aging processes once they are emitted to the atmosphere. Probably the largest obstacle for the investigation of these processes in the laboratory is the long atmospheric lifetime of one week, demanding tailored experiments that cover this time span. This work presents results on the ability of two types of soot to act as cloud condensation nuclei (CCN) after exposure to atmospherically relevant levels of ozone and humidity. Aging times of up to 12&#8201;h were achieved by successful application of the continuous-flow stirred tank reactor (CSTR) concept while allowing for size-selection of particles prior to the aging step. 100&#8201;nm particles rich in organic carbon (OC) that were initially CCN-inactive showed significant CCN-activity at supersaturations (SS) down to 0.3&#8201;% after 10&#8201;h of exposure to 200&#8201;ppb of ozone. While this process was not affected by different levels of relative humidity in the range 5&#8211;75&#8201;%, a high sensitivity towards the ambient/reaction temperature was observed. Soot particles with a lower OC-content demanded an approximately four-fold longer aging duration to show CCN-activity for the same SS. Prior to the slow change in the CCN-activity, a rapid increase in the particle diameter was detected which occurred within several minutes. This study highlights the applicability of the CSTR-approach for the simulation of atmospheric aging processes, as aging durations beyond 12&#8201;h can be achieved in comparably small aerosol chamber volumes (<&#8201;3&#8201;m3). Implementation of our measurement results on the CCN-activity of soot particles retrieved from measurements at atmospherically relevant conditions into a global aerosol-climate model showed a statistically significant increase in the regional and global CCN burden and cloud droplet number concentration (CDNC).

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Section: Resultscontrasting

confidence: 54%

Section: Ccn-activitymentioning

confidence: 69%

mentioning

confidence: 99%

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Impact of Isolated Atmospheric Aging processes on the Cloud Condensation Nuclei-activation of Soot Particles

Friebel¹,

Lobo²,

Neubauer³

et al. 2019

Preprint

View full text Add to dashboard Cite

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“…Such a large variability in size distribution, morphology and chemical composition strongly impacts the reactivity of soot particles in the atmosphere and their propensity to evolve into CCN. Several studies exist that characterize the CCN activity of soot particles generated in the exhaust of laboratory flames (Lambe et al, 2015) and commercial burners like the miniCAST (Henning et al, 2012;Friebel et al, 2019). Soot particle aging experiments are often performed in laboratory conditions that simulate the atmosphere and make use of flow reactors (Kotzick et al, 1997;Lambe et al, 2015;Zuberi et al, 2005) or atmospheric simulation chambers (Tritscher et al, 2011;Wittbom et al, 2014;Grimonprez et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Influence of the dry aerosol particle size distribution and morphology on the cloud condensation nuclei activation. An experimental and theoretical investigation

Faccinetto

Grimonprez

et al. 2020

Atmos. Chem. Phys.

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Combustion and other high-temperature processes frequently result in the emission of aerosols in the form of polydisperse fractal-like aggregates made of condensedphase nanoparticles (soot for instance). If certain conditions are met, the emitted aerosol particles are known to evolve into important cloud condensation nuclei (CCN) in the atmosphere. In this work, the hygroscopic parameter κ of complex morphology aggregates is calculated from the supersaturation-dependent activated fraction F a = F a (SS) in the frame of κ-Köhler theory. The particle size distribution is approximated with the morphology-corrected volume equivalent diameter calculated from the electrical mobility diameter by taking into account the diameter of the primary particle and the fractal dimension of the aggregate experimentally obtained from transmission electron microscopy measurements. Activation experiments are performed in water supersaturation conditions using a commercial CCN-100 condensation nuclei counter. The model is tested in closeto-ideal conditions of size-selected, isolated spherical particles (ammonium sulfate nanoparticles dispersed in nitrogen), then with complex polydisperse fractal-like aggregates (soot particles activated by exposure to ozone with κ as low as 5 × 10 −5 ) that represent realistic anthropogenic emissions in the atmosphere.

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“…Aerosols are defined as fine solid particles or liquid droplets suspended in a gas phase. Aerosol particles impact the Earth's radiative budget both directly (e.g., through scattering of shortwave and absorption of shortwave and longwave radiation) (Haywood and Boucher, 2000) and indirectly (e.g., by changing the properties of clouds; Ackerman et al, 2000;Lohmann and Feichter, 2005;Seinfeld et al, 2016;Twomey, 1977). Furthermore, they demonstrate significant impacts on air quality and human health (Anenberg et al, 2012;Janssen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles

et al. 2019

View full text Add to dashboard Cite

Abstract. The largest contributors to the uncertainty in assessing the anthropogenic contribution in radiative forcing are the direct and indirect effects of aerosol particles on the Earth's radiative budget. Soot particles are of special interest since their properties can change significantly due to aging processes once they are emitted into the atmosphere. Probably the largest obstacle for the investigation of these processes in the laboratory is the long atmospheric lifetime of 1 week, requiring tailored experiments that cover this time span. This work presents results on the ability of two types of soot, obtained using a miniCAST soot generator, to act as cloud condensation nuclei (CCN) after exposure to atmospherically relevant levels of ozone (O3) and humidity. Aging times of up to 12 h were achieved by successful application of the continuous-flow stirred tank reactor (CSTR) concept while allowing for size selection of particles prior to the aging step. Particles of 100 nm diameter and rich in organic carbon (OC) that were initially CCN inactive showed significant CCN activity at supersaturations (SS) down to 0.3 % after 10 h of exposure to 200 ppb of O3. While this process was not affected by different levels of relative humidity in the range of 5 %–75 %, a high sensitivity towards the ambient/reaction temperature was observed. Soot particles with a lower OC content required an approximately 4-fold longer aging duration to show CCN activity at the same SS. Prior to the slow change in the CCN activity, a rapid increase in the particle diameter was detected which occurred within several minutes. This study highlights the applicability of the CSTR approach for the simulation of atmospheric aging processes, as aging durations beyond 12 h can be achieved in comparably small aerosol chamber volumes (<3 m3). Implementation of our measurement results in a global aerosol-climate model, ECHAM6.3-HAM2.3, showed a statistically significant increase in the regional and global CCN burden and cloud droplet number concentration.

show abstract

Cloud condensation nuclei from the activation with ozone of soot particles sampled from a kerosene diffusion flame

Cited by 25 publications

References 82 publications

Impact of Isolated Atmospheric Aging processes on the Cloud Condensation Nuclei-activation of Soot Particles

Impact of Isolated Atmospheric Aging processes on the Cloud Condensation Nuclei-activation of Soot Particles

Influence of the dry aerosol particle size distribution and morphology on the cloud condensation nuclei activation. An experimental and theoretical investigation

Impact of isolated atmospheric aging processes on the cloud condensation nuclei activation of soot particles

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