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.

这个渴望的项目的目的是研究一种化学机制，该化学机制可以利用来自海洋喷雾剂的天然氯和从热带大西洋上的撒哈拉粉尘中的铁和铁从大气中氧化和去除甲烷。最近有人提出，将氯的人工引入大气中去除甲烷可能是减轻温室气体排放的气候影响的可行选择。尽管有限的实验室研究表明，这种机制可以去除甲烷，但基本上对该方法的生存能力及其造成有害影响的可能性几乎没有理解。MDSA（矿物防尘喷雾剂气溶胶）机制取决于甲烷和氯（CH4 + CL）反应对氯化物的回收。在不同的大气条件下建立相对于铁和氯的催化效率是该项目的关键目标。在2024年6月/7月的6周期间，将在巴巴多斯附近进行一次飞机运动，并与Magpie（水分和气溶胶梯度/反转进化的物理学），这是由美国海军和NOAA资助的动态气象项目。测量将由气溶胶负载和尺寸分布以及大气中的一氧化碳，二氧化碳，甲烷，水蒸气和氯化氢的浓度以及3-D风速，方向和温度。将收集空气样品，以便随后在CO和CH4中分析Delta 13c，因为该数据将验证大气中甲烷的氯 - 氢抽象抽象机制的存在，据信在夏季中产生高度耗尽的13CO。该项目旨在评估在大气中添加氯以消除甲烷的生存能力，这对于缓解气候变化具有很高的社会意义。该奖项反映了NSF的法定任务，并且认为值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来获得支持。