Catalytic sulfate formation mechanism influenced by important constituents of cloud water via the reaction of SO2 oxidized by hypobromic acid in the marine areas

2021 ◽  
Author(s):  
Jiarong Liu ◽  
Danli Liang ◽  
Ling Liu ◽  
An Ning ◽  
Xiuhui Zhang
Keyword(s):  
Formation Mechanism ◽  
Atmospheric Aerosol ◽  
Cloud Water ◽  
Sulfate Formation ◽  
Marine Areas

Comprehensive investigations of the possible formation pathways of sulfate, the main composition of atmospheric aerosol in the marine areas, continue to challenge atmospheric chemists. As one of the most important...

scholarly journals Fast oxidation of sulfur dioxide by hydrogen peroxide in deliquesced aerosol particles

2020 ◽  
Vol 117 (3) ◽  
pp. 1354-1359 ◽  
Author(s):  
Tengyu Liu ◽  
Simon L. Clegg ◽  
Jonathan P. D. Abbatt
Keyword(s):  
Hydrogen Peroxide ◽  
Air Quality ◽  
Sulfur Dioxide ◽  
Atmospheric Aerosol ◽  
Flow Reactor ◽  
Aerosol Particles ◽  
Quality Models ◽  
Atmospheric Aerosol Particles ◽  
Haze Pollution ◽  
Sulfate Formation

Atmospheric sulfate aerosols have important impacts on air quality, climate, and human and ecosystem health. However, current air-quality models generally underestimate the rate of conversion of sulfur dioxide (SO2) to sulfate during severe haze pollution events, indicating that our understanding of sulfate formation chemistry is incomplete. This may arise because the air-quality models rely upon kinetics studies of SO2 oxidation conducted in dilute aqueous solutions, and not at the high solute strengths of atmospheric aerosol particles. Here, we utilize an aerosol flow reactor to perform direct investigation on the kinetics of aqueous oxidation of dissolved SO2 by hydrogen peroxide (H2O2) using pH-buffered, submicrometer, deliquesced aerosol particles at relative humidity of 73 to 90%. We find that the high solute strength of the aerosol particles significantly enhances the sulfate formation rate for the H2O2 oxidation pathway compared to the dilute solution. By taking these effects into account, our results indicate that the oxidation of SO2 by H2O2 in the liquid water present in atmospheric aerosol particles can contribute to the missing sulfate source during severe haze episodes.

Isotopic evidence for importance of atmospheric acidity on sulfate formation in the Mt. Everest region

2021 ◽  
Author(s):  
Shohei Hattori ◽  
Kun Wang ◽  
Mang Lin ◽  
Sakiko Ishino ◽  
Becky Alexander ◽  
...  
Keyword(s):  
Warm Season ◽  
Cold Season ◽  
Cloud Water ◽  
Formation Mechanisms ◽  
Relative Importance ◽  
Remote Site ◽  
Water Ph ◽  
Sulfate Formation ◽  
Ph Conditions

<p>Oxygen-17 anomaly (Δ<sup>17</sup>O) has been used as a probe to constrain the relative importance of different pathways leading to sulfate formation. Here, we report the Δ<sup>17</sup>O values in atmospheric sulfate collected at a remote site in the Mt. Everest region to decipher the possible formation mechanisms of sulfate in such a pristine environment. The Δ<sup>17</sup>O in non-dust sulfate show higher values than most existing data in modern atmospheric sulfate. The seasonality of Δ<sup>17</sup>O in non-dust sulfate exhibits high values in the pre-monsoon and low values in the monsoon, opposite to the seasonality in Δ<sup>17</sup>O for both sulfate and nitrate (i.e., minima in warm season and maxima in cold season) observed from diverse geographic sites. This high Δ<sup>17</sup>O in non-dust sulfate found in this region clearly indicates the important role of the S(IV) + O<sub>3</sub> pathway in atmospheric sulfate formation promoted by high cloud water pH conditions. In turn, this study highlights observational evidence that atmospheric acidity plays an important role in controlling sulfate formation pathways particularly for dust-rich environments.</p>

A pH dependent sulfate formation mechanism caused by hypochlorous acid in the marine atmosphere

2021 ◽  
Vol 787 ◽  
pp. 147551
Author(s):  
Jiarong Liu ◽  
An Ning ◽  
Ling Liu ◽  
Huixian Wang ◽  
Theo Kurtén ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Hypochlorous Acid ◽  
Marine Atmosphere ◽  
Sulfate Formation ◽  
Ph Dependent
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