EAGER: Airborne Investigation of the Chlorine Mediated Mineral Dust Sea Spray Aerosol (MDSA) Mechanism in the Western Atlantic

EAGER：西大西洋氯介导的矿物尘海喷雾气溶胶 (MDSA) 机制的机载调查

• 批准号: 2411615
• 负责人: John Mak
• 金额: $ 29.98万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-03-01 至 2026-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2411615&HistoricalAwards=false
• 关键词: EAGER; Airborne; Investigation; Chlorine; Mediated

The goal of this EAGER project is to investigate a chemical mechanism that can utilize naturally generated chlorine from sea-spray aerosol and iron from Saharan dust over the tropical Atlantic Ocean to oxidize and remove methane from the atmosphere. It recently has been suggested that the artificial introduction of chlorine into the atmosphere to remove methane might be a viable option for mitigating the climate impacts of greenhouse gas emissions. While limited laboratory studies have shown the potential for such a mechanism to remove methane, there is essentially little understanding of the viability of the method and its potential for causing harmful impacts.The MDSA (mineral dust-sea spray aerosol) mechanism depends on the recycling of hydrogen chloride by the methane and chlorine (CH4 + Cl) reaction. Establishing the catalytic efficiency of the process with respect to iron and chlorine under different atmospheric conditions is the key goal of this project. An aircraft campaign will be conducted near Barbados over a 6-week period during June/July 2024 in conjunction with MAGPIE (Moisture and Aerosol Gradients/Physics of Inversion Evolution), a dynamical meteorology project funded by the US Navy and NOAA. Measurements will be made of aerosol load and size distribution, and concentrations of atmospheric carbon monoxide, carbon dioxide, methane, water vapor, and hydrogen chloride, as well as 3-D wind speed and direction and temperature. Air samples will be collected for subsequent analysis of delta 13C in CO and CH4 as this data will validate the existence of the chlorine-hydrogen abstraction mechanism from atmospheric methane, believed to yield highly depleted 13CO in the summertime. This project to evaluate the viability of adding chlorine to the atmosphere to remove methane has high societal relevance for mitigating climate change.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.

这个EAGER项目的目标是研究一种化学机制，可以利用热带大西洋上空的海浪气溶胶中自然产生的氯和撒哈拉沙尘中的铁来氧化和去除大气中的甲烷。最近有人提出，人工将氯引入大气中以去除甲烷可能是减轻温室气体排放对气候影响的可行选择。虽然有限的实验室研究表明这种机制具有去除甲烷的潜力，但对该方法的可行性及其造成有害影响的可能性基本上了解甚少。MDSA（矿物尘埃-海喷雾气溶胶）机制取决于回收由甲烷和氯气(CH4+Cl)反应生成氯化氢。该项目的主要目标是确定不同大气条件下铁和氯的催化效率。 2024 年 6 月/7 月期间，将与 MAGPIE（水分和气溶胶梯度/反演物理）（由美国海军和 NOAA 资助的动态气象学项目）一起在巴巴多斯附近进行为期 6 周的飞机活动。测量内容包括气溶胶含量和粒径分布，以及大气中一氧化碳、二氧化碳、甲烷、水蒸气和氯化氢的浓度，以及 3D 风速、风向和温度。将收集空气样本，用于随后分析 CO 和 CH4 中的 13C，因为该数据将验证从大气甲烷中提取氯-氢机制的存在，据信在夏季会产生高度贫化的 13CO。该项目旨在评估向大气中添加氯以去除甲烷的可行性，对于缓解气候变化具有高度的社会相关性。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。