Cloudwater chemistry in the subcooled droplet regime at Mount Sonnblick (3106 M A.S.L., Salzburg, Austria)

Brantner, B.; Fierlinger, H.; Puxbaum, Hans; Berner, A.

doi:10.1007/bf00479800

Cited by 50 publications

(13 citation statements)

References 36 publications

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“…These are important characteristics because depending on the atmospheric environment where these compounds end up they can have different effects on the absorption of solar radiation. In an acidic environment, which is representative of aerosol liquid water, BrC would absorb less visible sunlight than it would under more neutral conditions in cloud and fog droplets. , …”

Section: Resultssupporting

confidence: 92%

“…In an acidic environment, which is representative of aerosol liquid water, 36 BrC would absorb less visible sunlight than it would under more neutral conditions in cloud and fog droplets. 46,47 In all the SOA samples, there was a decrease in the measured absorption coefficients over the irradiation time at all visible wavelengths (Figures 1 and 2). For BEN and TOL SOA, the decrease was the largest at 350 nm, where nitrophenols are known to absorb.…”

Section: Methodssupporting

confidence: 92%

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Effect of Photolysis on Absorption and Fluorescence Spectra of Light-Absorbing Secondary Organic Aerosols

Aiona

Luek

Timko

et al. 2018

ACS Earth Space Chem.

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Excitation−emission matrices (EEMs) constructed from fluorescence measurements are increasingly used for the characterization of chromophoric dissolved organic matter (CDOM) and light-absorbing atmospheric organic aerosols known as brown carbon (BrC). There is a high uncertainty in the effect of BrC aerosols on climate because their optical properties depend on the amount of time they spent in the atmosphere. In order to aid in the quantification of BrC aerosols' contribution to radiative forcing, we investigated the effect of solar radiation on the fluorescence, expressed as EEMs, and absorption spectra of the water-soluble fraction of BrC species formed by the high-NOx photooxidation of benzene, toluene, pxylene, and naphthalene. The BrC samples were prepared in a smog chamber, extracted in water, and irradiated in a solar simulator at a fixed pH of 3, representative of aerosol liquid water, or at a fixed pH of 6, representative of cloudwater. Semicontinuous fluorescence and absorbance measurements were carried out during the irradiation at 20 min intervals for 44 h. The absorption coefficients depended on the solution pH, with the solutions at pH 6 absorbing stronger than solutions at pH 3. All samples underwent a decrease in absorption coefficient at all visible wavelengths, whereas fluorescence intensities showed both increases and decreases in different regions of the EEMs. Upon comparison with CDOM samples, the fluorescence intensity of all secondary organic aerosol (SOA) samples decreased in the region of the EEMs where the characteristic terrestrial humic-like C peak occurs. These experimental observations suggest that (i) this type of BrC will have different effects on climate depending on whether it ends up in an acidic or neutral environment; (ii) exposure to UV radiation will diminish the ability of this type of BrC to affect climate on a time scale of about a day; (iii) fluorescence by BrC compounds has a minimal effect on aerosol radiative forcing; (iv) photooxidized aromatics may be closely related, in terms of optical properties, to CDOM found in fresh waters.

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Section: Resultssupporting

confidence: 92%

Section: Methodssupporting

confidence: 92%

Effect of Photolysis on Absorption and Fluorescence Spectra of Light-Absorbing Secondary Organic Aerosols

Aiona

Luek

Timko

et al. 2018

ACS Earth Space Chem.

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“…The PUY station belongs to the atmospheric survey networks EMEP (European Monitoring and Evaluation Program), GAW (Global Atmosphere Watch), and ACTRIS (Aerosols, Clouds, and Trace gases Research Infrastructure). Cloud water sampling was performed by using a dynamic one-stage cloud water impactor (cut off diameter of approximately 7 μm , ). The aluminum impactor was cleaned and sterilized by autoclaving before and after each cloud collection.…”

Section: Methodsmentioning

confidence: 99%

Molecular Characterization of Cloud Water Samples Collected at the Puy de Dôme (France) by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Bianco

Deguillaume

Vaïtilingom

et al. 2018

Environ. Sci. Technol.

137

128

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Cloud droplets contain dynamic and complex pools of highly heterogeneous organic matter, resulting from the dissolution of both water-soluble organic carbon in atmospheric aerosol particles and gas-phase soluble species, and are constantly impacted by chemical, photochemical, and biological transformations. Cloud samples from two summer events, characterized by different air masses and physicochemical properties, were collected at the Puy de Dôme station in France, concentrated on a strata-X solid-phase extraction cartridge and directly infused using electrospray ionization in the negative mode coupled with ultrahigh-resolution mass spectrometry. A significantly higher number (n = 5258) of monoisotopic molecular formulas, assigned to CHO, CHNO, CHSO, and CHNSO, were identified in the cloud sample whose air mass had passed over the highly urbanized Paris region (J1) compared to the cloud sample whose air mass had passed over remote areas (n = 2896; J2). Van Krevelen diagrams revealed that lignins/CRAM-like, aliphatics/proteins-like, and lipids-like compounds were the most abundant classes in both samples. Comparison of our results with previously published data sets on atmospheric aqueous media indicated that the average O/C ratios reported in this work (0.37) are similar to those reported for fog water and for biogenic aerosols but are lower than the values measured for aerosols sampled in the atmosphere and for aerosols produced artificially in environmental chambers.

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“…Reactive trace gas concentrations (O 3 , NO x , SO 2 , VOC), particle number, size distribution, and cloud microphysical parameters (i.e., droplet radius and liquid water content (LWC)) are measured continuously. In addition, a dynamic one-stage cloudwater impactor is used for sampling cloudwater. , Prior to sampling, the aluminum impactor is cleaned with ultrapure water and sterilized by an autoclave.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, a dynamic one-stage cloudwater impactor is used for sampling cloudwater. 39,40 Prior to sampling, the aluminum impactor is cleaned with ultrapure water and sterilized by an autoclave. Physicochemical Analysis.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Chemical Characterization of Cloudwater Collected at Puy de Dôme by FT-ICR MS Reveals the Presence of SOA Components

Bianco

Riva

Baray

et al. 2019

ACS Earth Space Chem.

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Secondary organic aerosols (SOA) produced in the atmosphere from sequential oxidation of biogenic or anthropogenic volatile organic compounds (VOC) represent a significant part of the atmospheric organic aerosol. Aerosol particles can act as cloud condensation nuclei or can be scavenged by cloud droplets, where organic carbon undergo chemical and biological transformations. Due to its high complexity, a nontargeted analysis by FT-ICR MS (Fouriertransform ion cyclotron resonance mass spectrometry) has been used to characterize the dissolved organic matter at a molecular level. SOA compounds have been detected in six aqueous samples collected in 2017 at the Puy de Dome station (PUY, France). SOA tracers, produced by VOC oxidation in environmental chambers or in ambient air and characterized in previous studies by mass spectrometry, were searched by FT-ICR MS in cloudwaters. Results clearly indicate the presence of oxidation products of isoprene, αand β-pinene, and other monoterpenes and sesquiterpenes. Interestingly, a significant number of assigned molecular formulas are attributed to brown carbon and nitroaromatics. Seasonal variabilities are also observed for organonitrates and organosulfates.

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Cloudwater chemistry in the subcooled droplet regime at Mount Sonnblick (3106 M A.S.L., Salzburg, Austria)

Cited by 50 publications

References 36 publications

Effect of Photolysis on Absorption and Fluorescence Spectra of Light-Absorbing Secondary Organic Aerosols

Effect of Photolysis on Absorption and Fluorescence Spectra of Light-Absorbing Secondary Organic Aerosols

Molecular Characterization of Cloud Water Samples Collected at the Puy de Dôme (France) by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Chemical Characterization of Cloudwater Collected at Puy de Dôme by FT-ICR MS Reveals the Presence of SOA Components

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