Collaborative Research: P2C2--Drivers for Past Variability in Tropospheric Reactive Halogens: Implications for Climate and Evaluation of Ice Core Proxies

合作研究：P2C2——对流层活性卤素过去变化的驱动因素：对气候和冰芯代理评估的影响

• 批准号: 1702106
• 负责人: Lee Murray
• 金额: $ 20.15万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702106&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Drivers; Past

This project aims to examine reactive halogens and their impacts on the chemistry of the troposphere and stratosphere especially with regards to climate. Reactive halogens impact the oxidative capacity of the atmosphere thereby influencing reduced concentrations of trace gases such as methane CH4 and the abundance of short lived climate forcing agents such as ozone (O3) and aerosols in the atmosphere. Ice-core observations of the precursors and/or sinks of reactive halogens in the troposphere suggest both anthropogenic- and climate-induced changes in the abundance of reactive halogens in the troposphere. This has an, as of yet, unquantified impact on several paleoclimate proxies in ice cores.The researchers plan to investigate the sensitivity of reactive halogen abundance to anthropogenic emissions and to climate change in a global model and examine its potential feedbacks on climate. As such, the project will focus on the following two research questions: (1) What are the biggest drivers for changes in the abundance of reactive halogens over the preindustrial-industrial and glacial-interglacial timescales; and (2) What are the potential implications for the oxidizing capacity of the atmosphere and short-lived climate forcing agents CH4, tropospheric O3, and aerosols.The potential broader impacts include the potential to advance knowledge and understanding within atmospheric chemistry and climate and paleoclimatology, via potential improvement of the representation of reactive chemistry in global climate system models with interactive carbon simulation. The project supports the training graduate students in numerical modeling of atmospheric chemistry, outreach and education. It also provides for the wider community dissemination of research results of GEOS-CHEM model development through workshops and meeting sessions and public and K12 outreach and education efforts by the researchers.

该项目旨在研究活性卤素及其对对流层和平流层化学的影响，特别是对气候的影响。活性卤素会影响大气的氧化能力，从而影响甲烷 CH4 等痕量气体浓度的降低以及大气中臭氧 (O3) 和气溶胶等短期气候强迫剂的丰度。对对流层中活性卤素前体和/或汇的冰芯观测表明，人为和气候引起的对流层中活性卤素丰度的变化。到目前为止，这对冰芯中的几个古气候指标产生了无法量化的影响。研究人员计划在全球模型中研究活性卤素丰度对人为排放和气候变化的敏感性，并研究其对气候的潜在反馈。因此，该项目将重点关注以下两个研究问题：（1）在前工业-工业和冰期-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； (2) 对大气氧化能力和短期气候强迫剂 CH4、对流层 O3 和气溶胶有哪些潜在影响。潜在更广泛的影响包括通过交互式碳模拟改善全球气候系统模型中反应化学的表征，有可能促进大气化学、气候和古气候学方面的知识和理解。该项目支持培训大气化学数值模拟、推广和教育方面的研究生。它还通过研究人员的研讨会和会议以及公众和 K12 的推广和教育工作，在更广泛的社区传播 GEOS-CHEM 模型开发的研究成果。

项目成果

Anthropogenic Impacts on Tropospheric Reactive Chlorine Since the Preindustrial

• DOI: 10.1029/2021gl093808
• 发表时间: 2021-07
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: S. Zhai;Xuan Wang;J. McConnell;L. Geng;J. Cole‐Dai;M. Sigl;N. Chellman;T. Sherwen;R. Pound-R.-Pou