Collaborative proposal: Glacial-interglacial variability in tropospheric reactive halogens

这项研究的总体目标是在全球模式中调查活性卤素丰度对冰期-间冰期气候变化的敏感性，并研究其对冰芯替代物的影响。这项研究特别侧重于三个研究问题：1)海冰上吹雪能否解释在格陵兰和南极冰芯观察到的冰期-间冰期时间尺度上钠离子的增加；2)冰期-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暂的气候强迫作用力甲烷、对流层臭氧和气溶胶的潜在影响是什么。该项目将有助于提高对重大气候过渡中活性卤素的理解，并通过它们对大气氧化能力的影响来研究它们在气候反馈中的作用。大气中甲烷、臭氧和气溶胶的丰度可能通过它们的直接和间接辐射强迫在各种时间尺度上对地球气候系统产生重大影响，以及由于它们对生物圈的影响而对生物地球化学循环产生影响。该项目还为研究生和本科生提供支持。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

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.