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: 1702266
• 负责人: Becky Alexander
• 金额: $ 36.42万
• 依托单位: University of Washington
• 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 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702266&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.

该项目旨在检查反应性卤素及其对对流层和平流层化学的影响，尤其是在气候方面。反应性卤素影响大气的氧化能力，从而影响诸如甲烷CH4等痕量气体的浓度降低，以及在大气中的少量生命的气候强迫剂（O3）和气溶胶等短暂的气候强迫剂。对流层中反应性卤素的前体和/或水槽的冰核观察表明，对流层中反应性卤素丰度的人为和气候引起的变化。到目前为止，这对冰芯中的几个古气候代理具有未量化的影响。研究人员计划研究反应性卤素丰度对人为排放的敏感性，并在全球模型中调查气候变化，并检查其在气候上的潜在反馈。因此，该项目将重点介绍以下两个研究问题：（1）在工业前工业和冰川裂纹的时间表上，反应性卤素的变化最大的驱动因素是什么； （2）对大气的氧化能力和短暂的气候迫使电源CH4，对流层O3和气溶胶的潜在影响是什么。潜在的更广泛的影响包括在全球气候系统模型中反应性化学的潜在改善与互动较大的气候系统模型的代表来提高大气化学和气候化学和古气候学内的知识和了解。该项目支持培训研究生大气化学，外展和教育的数值建模。它还通过研讨会和会议和公共会议以及研究人员的K12宣传和教育工作来更广泛地传播Geos-Chem模型开发的研究结果。

项目成果

Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing

• DOI: 10.1029/2019gl085838
• 发表时间: 2020-02-28
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Horowitz, Hannah M.;Holmes, Christopher;Alexander, Becky
• 通讯作者: Alexander, Becky

Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants

全球对流层卤素（Cl、Br、I）化学及其对氧化剂的影响

• DOI: 10.5194/acp-21-13973-2021
• 发表时间: 2021
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Wang, Xuan;Jacob, Daniel J.;Downs, William;Zhai, Shuting;Zhu, Lei;Shah, Viral;Holmes, Christopher D.;Sherwen, Tomás;Alexander, Becky;Evans, Mathew J.
• 通讯作者: Evans, Mathew J.

Seasonally Resolved Holocene Sea Ice Variability Inferred From South Pole Ice Core Chemistry

从南极冰芯化学推断季节性解析的全新世海冰变化

• DOI: 10.1029/2020gl091602
• 发表时间: 2021
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Winski, Dominic A.;Osterberg, Erich C.;Kreutz, Karl J.;Ferris, David G.;Cole‐Dai, Jihong;Thundercloud, Zayta;Huang, Jiayue;Alexander, Becky;Jaeglé, Lyatt;Kennedy, Joshua A.
• 通讯作者: Kennedy, Joshua A.

Evaluating the impact of blowing-snow sea salt aerosol on springtime BrO and O₃ in the Arctic

评估北极地区吹雪海盐气溶胶对春季 BrO 和 O₃ 的影响

• DOI: 10.5194/acp-20-7335-2020
• 发表时间: 2020
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Huang, Jiayue;Jaeglé, Lyatt;Chen, Qianjie;Alexander, Becky;Sherwen, Tomás;Evans, Mat J.;Theys, Nicolas;Choi, Sungyeon
• 通讯作者: Choi, Sungyeon

Effect of sea salt aerosol on tropospheric bromine chemistry

• DOI: 10.5194/acp-19-6497-2019
• 发表时间: 2018-11
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Lei Zhu;D. Jacob;S. Eastham;M. Sulprizio;Xuan Wang;T. Sherwen;M. Evans;Qianjie Chen;B. Alexander;T. Koenig;R. Volkamer;L. G. Huey;M. Breton;T. Bannan;C. Percival