Direct Studies of Peroxy Radical Autoxidation Reactions

过氧自由基自氧化反应的直接研究

• 批准号: NE/X000516/1
• 负责人: Alexander Archibald
• 金额: $ 17.43万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FX000516%2F1
• 关键词: Direct; Studies; Peroxy; Radical; Autoxidation

Biogenic volatile organic compounds (BVOCs) play a crucial role in climate by setting the background levels of aerosol in the atmosphere. Aerosols directly and indirectly interact with solar radiation and affect climate. BVOCs also play a crucial role in air quality through forming secondary pollutants like O3 which adversely affect humans and plants. Peroxy radicals (RO2) are key intermediates involved in these physio-chemical processes and are formed with myriad structural differences which are predicted to greatly affect their reactivity and pathways to form aerosols and O3. However, until the recent breakthroughs in near infrared cavity ring-down spectroscopy understanding the distribution of RO2 structures and reactivity, and so the effects on aerosols and O3, was impossible. Here we propose a combined laboratory and Earth system modelling project which will determine the key physio-chemical properties of RO2 from the most important BVOCs (isoprene and alpha-pinene) and integrate this knowledge through the development and incorporation of chemical mechanisms that will be used to simulate the climate impacts of BVOCs more faithfully than ever possible before. The results from this project will be of direct benefit to academic researchers in atmospheric and physical sciences and policy makers planning for the environmental and climate changes in the near and long-term future. This project will enable Dr Rabi Chhantyal Pun to start a new research program focused on laboratory photochemistry at the University of Nottingham, with modelling support from Dr Alexander Archibald at the University of Cambridge. It will also provide state-of-art laboratory and atmospheric chemistry training for a new postdoctoral research associate.

生物挥发性有机化合物 (BVOC) 通过设定大气中气溶胶的背景水平，在气候中发挥着至关重要的作用。气溶胶直接或间接与太阳辐射相互作用并影响气候。 BVOC 还通过形成 O3 等二次污染物，对人类和植物产生不利影响，从而对空气质量发挥着至关重要的作用。过氧自由基 (RO2) 是参与这些物理化学过程的关键中间体，其形成时具有多种结构差异，预计这些差异将极大地影响它们的反应性以及形成气溶胶和 O3 的途径。然而，直到最近近红外腔衰荡光谱学取得突破，了解 RO2 结构和反应性的分布以及对气溶胶和 O3 的影响是不可能的。在这里，我们提出了一个实验室和地球系统联合建模项目，该项目将确定来自最重要的 BVOC（异戊二烯和 α-蒎烯）的 RO2 的关键物理化学性质，并通过开发和合并将使用的化学机制来整合这些知识比以往任何时候都更真实地模拟 BVOC 对气候的影响。该项目的结果将直接惠及大气和物理科学领域的学术研究人员以及规划近期和长期未来环境和气候变化的政策制定者。该项目将使 Rabi Chhantyal Pun 博士能够在诺丁汉大学启动一项新的研究项目，重点关注实验室光化学，并得到剑桥大学 Alexander Archibald 博士的建模支持。它还将为新的博士后研究员提供最先进的实验室和大气化学培训。