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.

这项研究的总体目标是调查全球模型中活性卤素丰度对冰川间冰期气候变化的敏感性，并研究其对冰芯代理的影响。该研究特别关注三个研究问题：1）海冰上的吹雪能否解释在冰川-间冰期时间尺度上格陵兰和南极冰芯中观察到的钠离子增加; 2）在冰川-间冰期时间尺度上，活性卤素丰度变化的最大驱动因素是什么？以及3）对大气氧化能力和短期气候强迫因子甲烷、对流层臭氧、该项目将有助于提高对重大气候转变过程中活性卤素的认识，并通过其对大气氧化能力的影响，研究其在气候反馈中的作用所涉问题。 大气中甲烷、臭氧和气溶胶的丰度可能通过其直接和间接的辐射强迫，以及由于其对生物圈的影响而对地球化学循环产生的影响，在各种时间尺度上对地球气候系统产生重大影响。 该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。