Journal ArticleDOI
The photochemistry of a remote marine stratiform cloud
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TLDR
In this article, coupled gas and aqueous-phase photochemistry of a stratiform cloud in a remote region of the marine atmosphere is investigated with a time-dependent box model.Abstract:
The coupled gas- and aqueous-phase photochemistry of a stratiform cloud in a remote region of the marine atmosphere is investigated with a time-dependent box model. Both scavenging of ambient acidic aerosols and gases as well as aqueous-phase chemical reactions within droplets are found to be important sources of acidity to cloud water and can lead to pH levels in cloud water in the remote marine atmosphere well below 5.6. The major sources of acidity via aqueous-phase chemical reactions are the generation of sulfuric acid from dissolved SO2 and the generation of formic acid from dissolved formaldehyde. In both cases, aqueous-phase free radicals can play a significant role either directly by oxidizing dissolved SO2 and HCHO or indirectly by producing the aqueous-phase oxidant H2O2. The rate of SO2 conversion to sulfuric acid is sensitive to a variety of parameters including the accommodation or sticking coefficient for SO2, H2O2, HO2, and OH, the liquid water content, and the ambient levels of SO2, HNO3, and other acidic or basic gases. Because high levels of SO2 tend to deplete cloud water of H2O3, the possibility exists that the pH of precipitation in polluted regions will respond nonlinearly to reduced SO2 emissions.read more
Citations
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Modeling chemistry in and above snow at Summit, Greenland: Impact of snowpack chemistry on the oxidation capacity of the boundary layer
Jennie L. Thomas,Jack E. Dibb,G. Huey,Jin Liao,David B. Tanner,Barry Lefer,R. von Glasow,Jochen Stutz +7 more
TL;DR: In this paper, a coupled one-dimensional (1-D) snow chemistry and atmospheric boundary layer model MISTRA-SNOW was used to study the impact of snowpack chemistry on the oxidation capacity of the boundary layer.
Journal ArticleDOI
Formulation and Evaluation of IMS, an Interactive Three-Dimensional Tropospheric Chemical Transport Model 2. Model Chemistry and Comparison of Modelled CH4, CO, and O3 with Surface Measurements
TL;DR: In this article, the chemistry reaction mechanism used and compared modelled CH4, CO, and O3 with a dataset of annual surface measurements, showing good agreement between model and measurements, except for the site at Barrow where modelledwetland emission in the summer could be a factor 3 too high.
Journal ArticleDOI
A Modeling Study of the Influence of Ice Scavenging on the Chemical Composition of Liquid-Phase Precipitation of a Cumulonimbus Cloud
TL;DR: In this paper, the impact of ice-phase processes on the chemistry of precipitation in the context of a simulated cumulonimbus cloud was investigated. But the results were limited to the case where strong updrafts existed, as ahead of a cold front.
Journal ArticleDOI
Pulse radiolysis study of the reaction of SO5˙– with HO2˙
TL;DR: In this article, the reaction between SO5˙ and HO2˙ in aqueous solutions has been studied by pulse radiolysis and found to have a rate constant of (1.7 ± 0.1)× 109 dm3 mol−1 s−1 at ca. 20 °C.
Journal ArticleDOI
CARIBIC DOAS observations of nitrous acid and formaldehyde in a large convective cloud
Klaus-Peter Heue,Hella Riede,David Walter,Carl A. M. Brenninkmeijer,Thomas Wagner,Udo Frieß,Ulrich Platt,Andreas Zahn,Greta Stratmann,Helmut Ziereis +9 more
TL;DR: In this article, a case study where enhancements in HONO, HCHO and nitrogen oxides (NOx) were observed by the CARIBIC flying laboratory (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container).
References
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Book
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TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
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