Experimental and Theoretical Studies of Potential New Atmospheric Sources and Sinks of Nitrous Oxide

潜在的新大气一氧化二氮源和汇的实验和理论研究

• 批准号: 9526510
• 负责人: Paul Wine
• 金额: $ 21万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526510&HistoricalAwards=false
• 关键词: Experimental; Theoretical; Studies; Potential; New

9526510 Wine This project addresses the subject of sources and sinks of atmospheric nitrous oxide. This species is the dominant source of ozone-destroying nitric oxide radicals in the stratosphere. Furthermore, it is a greenhouse gas, and its concentration has been increasing. The current belief is that nitrous oxide has no natural sources other than microbiological activity in the ground and oceans, and its destruction is solely by photodissociation and reaction with excited atomic oxygen in the upper atmosphere. However, current estimates of sources and sinks suggest the existence of a currently unrecognized source. Furthermore, recent measurements of the isotopic composition of atmospheric nitrous oxide cannot be explained by accepted sources. Laboratory experiments will be performed in this project to investigate the potential formation of nitrous oxide from the reactions of electronically excited nitrogen dioxide and hydroxyl radicals with molecular nitrogen in the presence of oxygen. Chemical kinetics modeling studies will investigate why nitrous oxide is efficiently formed upon UV illumination of a nitrogen/oxygen mixture without ozone added, but not in a mixture of all three. These calculations will provide guidance for future experimental investigation of the issue of nitrous oxide production and destruction. ***

9526510葡萄酒本项目涉及大气一氧化二氮的来源和汇的主题。这个物种是平流层中破坏臭氧的一氧化氮自由基的主要来源。此外，它是一种温室气体，其浓度一直在增加。目前的看法是，除了地面和海洋中的微生物活动外，氧化亚氮没有天然来源，它的破坏完全是通过光解作用和与上层大气中受激发的氧原子反应。然而，目前对源和汇的估计表明存在一种目前尚未认识的源。此外，最近对大气一氧化二氮同位素组成的测量不能用公认的来源来解释。本项目将进行实验室实验，以研究在氧气存在的情况下，电子激发二氧化氮和羟基自由基与分子氮的反应可能形成氧化亚氮。化学动力学模型研究将调查为什么在没有添加臭氧的氮/氧混合物的紫外线照射下有效地形成氧化亚氮，而不是在三者的混合物中形成氧化亚氮。这些计算结果将为今后对氧化亚氮产生和破坏问题的实验研究提供指导。＊＊＊