Collaborative Research: NSFGEO-NERC--Coupled Tropospheric Reactive Halogen Chemistry in the Subtropical Marine Boundary Layer

该项目由美国国家科学基金会地球科学理事会（NSF/GEO）和英国国家环境研究委员会（UKRI/NERC）通过NSF/GEO-NERC牵头机构协议共同资助。该协议允许美国/英国提交一份联合提案，并由其调查员拥有最大比例预算的机构进行同行评审。在成功地共同确定一项奖励后，每个机构为预算的比例和与自己的调查人员有关的调查人员和工作的组成部分提供资金。本研究探讨了反应性卤素对大气氧化能力（反应性）的影响。将在百慕大的图多尔山海洋大气观测站进行一项测量活动，以测量反应性气态卤素（溴、氯和碘）及其气溶胶相对应物。本研究结果将提高反应性卤素化学在大气化学输运模型中的过程水平表征，提高准确预测大气中臭氧等污染物浓度的能力。这项工作支持的观测结果将包括预期最丰富的活性气态溴、氯和碘（HCl、BrO、ClNO2、IO等）及其气溶胶相对应物（Br-、Cl-、I-），气相物质就是从这些物质中衍生出来的。对于气相卤素，将采用三种不同的观测技术（CIMS, LP-DOAS， TILDAS），允许比较一些关键活性卤素的测量结果，同时也扩大了测量卤素的套件。作为该项目的一部分，卤素化学的化学详细表示将包括在GEOS-Chem模型中。该项目将支持三名美国研究生和一名英国研究生，为这些学生提供实地工作、全球建模和国际合作方面的经验。该奖项反映了美国国家科学基金会的法定使命，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。

This is a project that is jointly funded by the National Science Foundation’s Directorate of Geosciences (NSF/GEO) and the National Environment Research Council (UKRI/NERC) of the United Kingdom (UK) via the NSF/GEO-NERC Lead Agency Agreement. This Agreement allows a single joint US/UK proposal to be submitted and peer-reviewed by the Agency whose investigator has the largest proportion of the budget. Upon successful joint determination of an award, each Agency funds the proportion of the budget and the investigators associated with its own investigators and component of the work.This research addresses the influence of reactive halogens on the oxidation capacity (the reactivity) of the atmosphere. A measurement campaign will be conducted at the BIOS Tudor Hill Marine Atmospheric Observatory in Bermuda to measure reactive gaseous halogens (bromine, chlorine, and iodine species) and their aerosol-phase counterparts. The results of this research will improve the process level representation of reactive halogen chemistry in atmospheric chemical transport models, increasing the ability to accurately predict the concentrations of pollutants such as ozone in the atmosphere.The observations supported by this effort will include what are expected to be the most abundant reactive gaseous bromine, chlorine, and iodine species (HCl, BrO, ClNO2, IO, among several others) and their aerosol-phase counterparts (Br-, Cl-, I-) from which the gas-phase species are derived. For gas-phase species, three different observational techniques (CIMS, LP-DOAS, TILDAS) will be employed, allowing for comparison of the measurements of some key reactive halogens while also expanding the suite of measured halogen species. A chemically detailed representation of the halogen chemistry will be included into the GEOS-Chem model as part of this project. This project will support three U.S. graduate students and one U.K. graduate student, providing these students with experience in field work, global modeling, and international collaboration.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.