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.

EAGER项目的目标是研究一种化学机制，可以利用海洋喷雾气溶胶中自然产生的氯和热带大西洋上空撒哈拉尘埃中的铁来氧化和去除大气中的甲烷。最近有人提出，人为地将氯引入大气层以去除甲烷，可能是减轻温室气体排放对气候影响的一个可行办法。虽然有限的实验室研究表明，这种机制，以消除甲烷的潜力，有基本上是很少了解的方法的可行性和其潜在的造成有害影响MDSA（矿物粉尘海喷雾气溶胶）机制取决于氯化氢的甲烷和氯（CH 4 + Cl）的反应循环。本项目的主要目标是确定该工艺在不同大气条件下对铁和氯的催化效率。2024年6月/7月期间，将在巴巴多斯附近进行为期6周的飞机活动，并与美国海军和NOAA资助的动力气象学项目MAGPIE（水分和气溶胶粒子/反转演化物理学）一起进行。将测量气溶胶的负荷和尺寸分布，大气中一氧化碳、二氧化碳、甲烷、水蒸气和氯化氢的浓度，以及三维风速、风向和温度。将收集空气样本，用于随后分析CO和CH 4中的δ 13 C，因为这些数据将验证大气甲烷中氯-氢提取机制的存在，据信在夏季产生高度贫化的13 CO。该项目旨在评估向大气中添加氯以去除甲烷的可行性，对缓解气候变化具有高度的社会意义。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。