Clouds play a major role in the production of acids in the atmosphere. One of the most studied in-cloud processes is the aqueous-phase oxidation of sulfur IV into sulfate. From previous studies, large observed concentration of sulfate species resulting from sulfur IV oxidation in the atmosphere during the late fall and winter are still unexplained. Ariya found that ozonolysis of alkenes can be an additional source of oxidant in the gasphase. / In this project, we assessed the effect of ozonolysis of alkenes on in-cloud sulfur chemistry. We used a tropospheric chemistry box-model called MOCCA (Model of Chemistry Considering Aerosols) coupled with a simple cloud droplet model in the presence and absence of ozonolysis. The results obtained reinforce the hypothesis that ozonolysis of alkenes can play a role in the sulfate production in cloud droplets. In fact, we observed that ozonolysis could, in a situation of a high pH, slow down the in-cloud oxidation and can possibly lead to an overall negative impact on the in-cloud sulfate production over an average cloud lifetime. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.79115 |
| Date | January 2002 |
| Creators | Probst, Gregor |
| Contributors | Leighton, H. G. (advisor), Ariya, Parisa (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Atmospheric and Oceanic Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001986189, proquestno: AAIMQ88284, Theses scanned by UMI/ProQuest. |
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