Collaborative proposal: Glacial-interglacial variability in tropospheric reactive halogens

合作提案：对流层活性卤素的冰期-间冰期变异性

• 批准号: 2202287
• 负责人: Becky Alexander
• 金额: $ 48.69万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2202287&HistoricalAwards=false
• 关键词: Collaborative; proposal; Glacial; interglacial; variability

The general goal of the research is to investigate the sensitivity of reactive halogen abundance to glacial-interglacial climate change in a global model and examine its implications for ice core proxies. The research specifically focuses on three research questions: 1) Can blowing snow on sea ice explain the increase in Sodium ions observed in Greenland and Antarctic ice cores on the glacial-interglacial timescale; 2) What are the biggest drivers for changes in the abundance of reactive halogens over the glacial-interglacial timescale; and 3) What are the potential implications for the oxidizing capacity of the atmosphere and short-lived climate forcing agents Methane, Tropospheric Ozone, and Aerosols.This project will help improve the understanding of reactive halogens over a major climate transition and examine the implications of their role in climate feedbacks via their influence on the oxidation capacity of the atmosphere. The atmospheric abundance of Methane, Ozone, and Aerosols may have significant impacts on the Earth’s climate system over a variety of timescales through their direct and indirect radiative forcing, as well as impacts on biogeochemical cycling due to their influence on the biosphere. The project also provides support for graduate and undergraduate students.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该研究的一般目标是研究全球模型中反应性卤素丰度对冰川间 - 冰川气候变化的敏感性，并检查其对冰核代理的影响。该研究专门针对三个研究问题：1）可以在海冰上吹雪解释在冰川间 - 冰川时期内观察到的在格陵兰岛和南极冰芯中观察到的钠离子的增加； 2）在冰川间冰期时间尺度上有很多反应性卤素变化的最大驱动因素是什么？ 3）对大气和短暂的气候迫使甲烷，对流层臭氧和气溶胶的氧化能力的潜在影响是什么。这项项目将有助于在重大气候过渡中对反应性卤素的理解，并检查其在气候反馈中对气候反馈的影响，通过对它们在气候反馈中的作用来影响它们的氧化能力。甲烷，臭氧和气溶胶的大气抽象可能会通过其直接和间接的辐射强迫对地球的气候系统产生重大影响，以及对生物地球化学循环的影响，因为它们对生物圈的影响。该项目还为研究生和本科生提供了支持。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准评估，被认为是宝贵的支持。