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Aqueous-Phase Photochemical Formation of Hydrogen Peroxide and Hydroxyl Radical in Clouds and Fogs

Aqueous-Phase Photochemical Formation of Hydrogen Peroxide and Hydroxyl Radical in Clouds and Fogs
云雾中过氧化氢和羟​​基自由基的水相光化学形成
批准号:
9307171
负责人:
Bruce Faust
金额:
$29.99万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1993
资助国家:
美国
项目状态:
已结题
起止时间:
1993-09-01 至 1997-02-28

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中文摘要
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英文摘要
9307171 Faust Aqueous-phase reactions of hydrogen peroxide (HOOH) and hydroxyl radical (OH) in atmospheric water drops play crucial roles in the chemistry of the troposphere, yet knowledge of the sources of these oxidants to the water drops is incomplete. While gas-to- drop partitioning of HOOH and OH has received much study, comparatively little attention has been focussed on aqueous-phase photochemical reactions as sources of these oxidants to atmospheric water drops. The objectives of this research are: (a) determination of quantum yields and sunlight rates of HOOH and OH photo-formation in authentic cloud and fog waters collected over several years from several locations, (b) determination of the seasonal dependence of HOOH and OH photo-formation, (c) comparisons of the relative importance of aqueous-phase photochemistry versus gas-to-drop partitioning as sources of HOOH and OH to atmospheric water drops, (d) to evaluate chemical and Physical parameters of authentic atmospheric waters as predictors (based on mechanistic considerations) of the HOOH and OH photo-formation rates and of the OH lifetime, (e) to determine rates and quantum yields of HOOH photo-formation from compounds of relevance to cloud and fog chemistry, and (f) to increase the understanding of mechanisms responsible for photochemical formation of the oxidants in authentic atmospheric waters and form the individual compounds. The project will characterize the photo-formation of HOOH and OH in authentic cloud and fog waters obtained form several high elevation sites. Additionally, survey studies will be carried out on the HOOH photo-formation form well-defined aqueous solutions of individual organic compounds. Overall, the results form this proposal will allow for a more accurate understanding to the sources of HOOH and OH to cloud and fog drops. This will improve our understanding of the atmospheric chemical cycles of peroxides, sulfur, carbon, iron, and other elements. This new knowledge will enhance our predictions of sulfuric acid and sulfate aerosol formation that affect acid deposition and the global cooling effect exerted by sulfate aerosols.
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Aqueous-Phase Photochemical Formation of Hydrogen Peroxide and Hydroxyl Radical in Clouds and Fogs
Aqueous-Phase Photochemical Oxidant Formation in Clouds, Fogand Rain
  • 批准号:
    8912206
  • 项目类别:
    Continuing Grant
  • 资助金额:
    $27.0万
  • 财政年份:
    1989
  • 负责人:
    Bruce Faust
  • 依托单位:
国内基金
海外基金
Baryogenesis, Dark Matter and Nanohertz Gravitational Waves from a Dark Supercooled Phase Transition
  • 批准号:
    24ZR1429700
  • 项目类别:
    省市级项目
  • 资助金额:
    --
  • 批准年份:
    2024
  • 负责人:
    YUICHIRO NAKAI
  • 依托单位:
ATLAS实验探测器Phase 2升级
  • 批准号:
    11961141014
  • 项目类别:
    国际(地区)合作与交流项目
  • 资助金额:
    3350万元
  • 批准年份:
    2019
  • 负责人:
    刘衍文
  • 依托单位:
地幔含水相Phase E的温度压力稳定区域与晶体结构研究
  • 批准号:
    41802035
  • 项目类别:
    青年科学基金项目
  • 资助金额:
    12.0万元
  • 批准年份:
    2018
  • 负责人:
    张里
  • 依托单位:
基于数字增强干涉的Phase-OTDR高灵敏度定量测量技术研究