RUI: Aqueous-Phase Photochemistry of Atmospheric Hydrocarbon Oxidation Products

RUI：大气碳氢化合物氧化产物的水相光化学

• 批准号: 9407566
• 负责人: John Allen
• 金额: $ 14.63万
• 依托单位: Indiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9407566&HistoricalAwards=false
• 关键词: RUI; Aqueous; Phase; Photochemistry; Atmospheric

A wide variety of hydrocarbons are emitted into the atmosphere from both natural and anthropogenic sources. Isoprene (2-methyl- 1,3-butadiene) is of particular interest because it has the largest global flux of any single hydrocarbon species with the possible exception of methane, Isoprene reacts rapidly with hydroxyl radical (OH) and ozone (O3) in the presence of NOx forming 3-buten-2 one( methyl vinyl ketone, MVK) and 2-methyl-2-propenal (methacrolein, MACR). Once formed, tropospheric MVK and MACR, as well as many other hydrocarbon oxidation products, may undergo a variety of reactions in the gas phase. It is likely that MVK, MACR and other hydrocarbon oxidation products can also partition into atmospheric water drops and undergo subsequent aqueous-phase reactions leading to the formation of peroxyl radicals (HO2/RO2) and other oxidant species, and there by, consuming MVK and MACR. Peroxyl radicals can destroy tropospheric O3 and form peroxides that rapidly oxidize sulfur dioxide (SO2) in the aqueous phase. The sulfate aerosol that is subsequently formed efficiently backscatters incoming solar radiation and exerts a significant cooling effect upon climate. These researchers therefore will study: 1) partitioning of MVK, MACR and other hydrocarbon oxidation products from the gas phase into water, 2) aqueous-phase photochemistry of MVK, MACR, and other hydrocarbon oxidation products under conditions that are typical of atmospheric water drops, and 3) aqueous-phase reactions of MVK, MACR and other hydrocarbon oxidation products with selected photochemical oxidants.

自然和人为来源都会发出各种各样的碳氢化合物。 异戊二烯（2-甲基-1,3-丁二烯）特别值得关注，因为它具有任何单个碳氢化合物物质的最大全球通量，可能是甲烷除外，异丙烯在Nox形成3-二甲基-2-二甲基元素（甲基元素，甲基元素）中，与羟基自由基（OH）和臭氧（OH）和臭氧（O3）迅速反应。 MACR）。 一旦形成，对流层MVK和MACR以及许多其他烃氧化产物可能会在气相中发生多种反应。 MVK，MACR和其他烃氧化产物可能还可以分配到大气水滴中，并经历随后的水相反应，导致过氧基自由基（HO2/RO2）和其他氧化剂的形成，并在其中消耗MVK和MACR。 过氧自由基可以破坏对流层O3并形成过氧化物，从而在水相中快速氧化二氧化硫（SO2）。 随后形成的硫酸盐气溶胶有效地进行了反向散射，并对气候产生显着的冷却作用。 因此，这些研究人员将研究：1）从气相中的MVK，MACR和其他碳氢化合物氧化产物分配到水中，2）MVK，MACR和其他碳氢化合物氧化产物的水相光学在大气水滴的典型条件下，以及选择了MVK，MVK，MV，MACR和其他杂化的氧化氧化物。