Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability
合作研究:重建南极洲 Law Dome 大气一氧化碳的碳 14 以限制长期羟基自由基变化
基本信息
- 批准号:1643664
- 负责人:
- 金额:$ 10.29万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-07-01 至 2022-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Hydroxyl radicals are responsible for removal of most atmospheric trace gases, including pollutants and important greenhouse gases. They have been called the "detergent of the atmosphere". Changes in hydroxyl radical concentration in response to large changes in reactive trace gas emissions, which may happen in the future, are uncertain. This project aims to provide the first estimates of the variability of atmospheric hydroxyl radicals since about 1880 AD when anthropogenic emissions of reactive trace gases were minimal. This will improve understanding of their stability in response to large changes in emissions. The project will also investigate whether ice cores record past changes in Southern Hemisphere westerly winds. These winds are a key component of the global climate system, and have an important influence on ocean circulation and possibly on atmospheric carbon dioxide concentrations. The project team will include three early career scientists, a postdoctoral researcher, and graduate and undergraduate students, working in collaboration with senior scientists and Australian collaborators. Firn air and shallow ice to a depth of about 233 m will be sampled at the Law Dome high-accumulation coastal site in East Antarctica. Trapped air will be extracted from the ice cores on site immediately after drilling. Carbon-14 of carbon monoxide (14CO) will be analyzed in firn and ice-core air samples. Corrections will be made for the in situ cosmogenic 14CO component in the ice, allowing for the atmospheric 14CO history to be reconstructed. This 14CO history will be interpreted with the aid of a chemistry-transport model to place the first observational constraints on the variability of Southern Hemisphere hydroxyl radical concentration after about 1880 AD. An additional component of the project will analyze Krypton-86 in the firn-air and ice-core samples. These measurements will explore whether ice-core Krypton-86 acts as a proxy for barometric pressure variability, and whether this proxy can be used in Antarctic ice cores to infer past movement of the Southern Hemisphere westerly winds.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.
羟基自由基负责清除大多数大气痕量气体,包括污染物和重要的温室气体。 它们被称为“大气的清洁剂”。未来可能发生的反应性痕量气体排放量的巨大变化引起的羟基自由基浓度的变化是不确定的。该项目旨在提供自公元1880年以来大气羟基自由基变化的第一次估计,当时活性痕量气体的人为排放量很小。 这将提高对它们在应对排放量大幅变化时的稳定性的理解。该项目还将调查冰芯是否记录了南半球西风过去的变化。这些风是全球气候系统的一个关键组成部分,对海洋环流和可能对大气二氧化碳浓度有重要影响。 该项目团队将包括三名早期职业科学家,一名博士后研究员,以及研究生和本科生,与资深科学家和澳大利亚合作者合作。 将在东南极洲的Law Dome高堆积沿海地点对约233米深的雪气和浅冰进行取样。在钻探后,将立即从现场的冰芯中提取被困的空气。一氧化碳(14 CO)中的碳-14将在积雪和冰芯空气样本中进行分析。将对冰中的原位宇宙成因14 CO组分进行校正,以重建大气14 CO历史。 这一14 CO历史将借助化学传输模型进行解释,以对大约公元1880年之后南半球羟自由基浓度的变化性进行第一次观察限制。该项目的另一个组成部分将分析积雪空气和冰芯样本中的氪-86。这些测量将探索冰核氪-86是否作为大气压力变化的代理,以及该代理是否可以用于南极冰核来推断南半球西风的过去运动。该奖项反映了NSF的法定使命,并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jeffrey Severinghaus其他文献
Rebuttal of Sweatman, Powell, and West's “Rejection of Holliday et al.'s alleged refutation of the Younger Dryas Impact Hypothesis”
- DOI:
10.1016/j.earscirev.2024.104961 - 发表时间:
2024-11-01 - 期刊:
- 影响因子:
- 作者:
Vance.T. Holliday;Tyrone L. Daulton;Patrick J. Bartlein;Mark B. Boslough;Ryan P. Breslawski;Abigail E. Fisher;Ian A. Jorgeson;Andrew C. Scott;Christian Koeberl;Jennifer R. Marlon;Jeffrey Severinghaus;Michail I. Petaev;Philippe Claeys - 通讯作者:
Philippe Claeys
Jeffrey Severinghaus的其他文献
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{{ truncateString('Jeffrey Severinghaus', 18)}}的其他基金
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- 批准号:
2146134 - 财政年份:2023
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
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合作研究:REU:利用 EDML 冰芯中的突变海因里希事件特征校准南极洲的水同位素温度计
- 批准号:
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- 资助金额:
$ 10.29万 - 项目类别:
Continuing Grant
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合作研究:海水中高精度稀有气体同位素测量对海气交换和深海通风的新限制
- 批准号:
1924394 - 财政年份:2019
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
MRI: Development of an Ultra-High-Precision Gas Mass Spectrometer
MRI:超高精度气体质谱仪的开发
- 批准号:
1920369 - 财政年份:2019
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
Collaborative Research: Snapshots of Early and Mid-Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area
合作研究:艾伦山蓝冰区早更新世和中更新世气候和大气成分的快照
- 批准号:
1744832 - 财政年份:2018
- 资助金额:
$ 10.29万 - 项目类别:
Continuing Grant
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合作研究:利用地下水中溶解的惰性气体同位素量化过去的地下水位深度和水文气候
- 批准号:
1702704 - 财政年份:2017
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
Rapid Access Ice Drill (RAID) Science Workshop
快速冰钻 (RAID) 科学研讨会
- 批准号:
1719246 - 财政年份:2016
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
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合作研究:Kr-86 作为上次冰消期期间南半球西风带气压变化和运动的代理
- 批准号:
1543229 - 财政年份:2016
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core
合作研究:整个南极深冰芯基于惰性气体和甲烷的气候记录
- 批准号:
1443710 - 财政年份:2015
- 资助金额:
$ 10.29万 - 项目类别:
Continuing Grant
Collaborative Research: Phase 2 Development of A Rapid Access Ice Drilling (RAID) Platform for Research in Antarctica
合作研究:用于南极洲研究的快速钻冰 (RAID) 平台的第二阶段开发
- 批准号:
1419979 - 财政年份:2014
- 资助金额:
$ 10.29万 - 项目类别:
Standard Grant
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