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[ subject:"Environmental science." ]
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Surface and Photochemistry of Oxidan...
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Hong, Angela Christine.
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Surface and Photochemistry of Oxidant Precursors on Atmospherically Relevant Aqueous Interfaces.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Surface and Photochemistry of Oxidant Precursors on Atmospherically Relevant Aqueous Interfaces./
作者:
Hong, Angela Christine.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:
165 p.
附註:
Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:
Dissertation Abstracts International78-10B(E).
標題:
Environmental science. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10251642
ISBN:
9781369854947
Surface and Photochemistry of Oxidant Precursors on Atmospherically Relevant Aqueous Interfaces.
Hong, Angela Christine.
Surface and Photochemistry of Oxidant Precursors on Atmospherically Relevant Aqueous Interfaces.
- Ann Arbor : ProQuest Dissertations & Theses, 2017 - 165 p.
Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Thesis (Ph.D.)--University of Toronto (Canada), 2017.
Snow/ice surfaces represent important environmental interfaces that influence atmospheric composition and chemistry. It remains challenging to reconcile experimental and field studies, because the molecular-level processes that occur at the air-aqueous interface are not well-characterized. To improve our understanding of these interactions, laboratory techniques were used to interrogate the behaviour of impurities at the air-aqueous interface. A complementary field study was conducted to look for evidence of snow-mediated chemistry.
ISBN: 9781369854947Subjects--Topical Terms:
677245
Environmental science.
Surface and Photochemistry of Oxidant Precursors on Atmospherically Relevant Aqueous Interfaces.
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Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
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Advisers: Jennifer G. Murphy; D. James Donaldson.
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Thesis (Ph.D.)--University of Toronto (Canada), 2017.
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Snow/ice surfaces represent important environmental interfaces that influence atmospheric composition and chemistry. It remains challenging to reconcile experimental and field studies, because the molecular-level processes that occur at the air-aqueous interface are not well-characterized. To improve our understanding of these interactions, laboratory techniques were used to interrogate the behaviour of impurities at the air-aqueous interface. A complementary field study was conducted to look for evidence of snow-mediated chemistry.
520
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A novel flow reactor system---featuring a Drilled Ice Flow Tube with varying degrees of crystallinity---was built to directly observe the effect of ice microstructure on trace gas uptake. The uptake and recovery of hydrogen peroxide in monocrystalline and polycrystalline flow tubes are compared to discern between surface adsorption and diffusion into grain boundaries. Results from this study offers mechanistic insight into the physical uptake of trace gases to ice surfaces.
520
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Glancing-angle Raman spectroscopy was used to investigate nitrate distribution at the air-aqueous interface in the presence of halide ions. Co-occurring ions may alter the surface propensity of nitrate and affect its access for atmospheric chemistry. Results suggest that bromide enhances, and chloride has little effect on the surface propensity of nitrate. These results highlight the importance of the chemical environment on potential reactivity at the air-aqueous interface.
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In a field study, the chemical role of the snowpack was inferred from vertical concentration gradients of reactive nitrogen oxides and ozone measured over snowpacks with distinct compositions. The results from the campaign show that the snowpack is coupled to the atmosphere through complex air-ice chemical interactions and is likely influenced by co-occurring impurities, such as crustal particulates and organics.
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Overall, this dissertation aims to elucidate fundamental processes that inform how we conceptualize snow/ice chemistry, and identify important mechanisms that may be occurring in a real environment.
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