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。活性卤素影响大气的氧化能力，从而影响甲烷等痕量气体的浓度降低，以及大气中臭氧（O3）和气溶胶等短期气候强迫因子的丰度。对对流层中活性卤素的前体和/或汇的冰芯观测表明，对流层中活性卤素的丰度存在人为和气候引起的变化。这对冰芯中的几个古气候代理有一个尚未量化的影响。研究人员计划在全球模型中调查活性卤素丰度对人为排放和气候变化的敏感性，并检查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-工业和冰川-间冰期时间尺度上，活性卤素丰度变化的最大驱动力是什么;以及（2）大气氧化能力和短期气候强迫因子CH 4，对流层O 3，潜在的更广泛的影响包括，通过互动碳模拟，可能改进全球气候系统模型中反应化学的表现形式，从而有可能增进对大气化学以及气候和古气候学的认识和理解。该项目支持对研究生进行大气化学数值建模、外联和教育方面的培训。它还规定通过讲习班和会议以及研究人员的公众和K12外联和教育工作，在社区更广泛地传播全球测地系统-化学模型开发的研究成果。

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