CAREER: What sets the CO2 thermostat? Insights from the global geochemical cycles of Ca, Mg, and K

职业：什么设置 CO2 恒温器？

• 批准号: 1654571
• 负责人: John Higgins
• 金额: $ 81.92万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-15 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1654571&HistoricalAwards=false
• 关键词: CAREER; What; sets; CO2; thermostat

Feedbacks between Earth's climate, the global carbon cycle, and the composition of seawater constitute one of the primary mechanisms invoked for maintaining habitable conditions on our planet over much of its 4 billion year history. This project seeks to provide a new foundation for our understanding of the marine processes that play a significant but underappreciated role in moderating Earth's chemical cycles through time. The research component of this CAREER award would involve the development and application of new analytical methods and tools to investigate some of the most poorly understood ways in which the chemical balance of the oceans is maintained. CAREER awards are also designed to support particularly strong educational efforts and the integration of research and education. To this end, Higgins proposes an educational monitoring program of urban tap water in Trenton, NJ in collaboration with Isles, Inc., a community development organization. This project would be carried out by teams consisting of Isles, Inc. employees, community volunteers, Trenton students, Princeton undergraduates, the lead investigator, and a postdoctoral investigator. Students would learn the steps of the scientific method through an investigation of the chemistry of their home tap water, get exposure to the nuts-and-bolts behind how science works, and develop an appreciation for how science can empower an individual and impact a community. The PI proposes to investigate marine processes that affect the flow of cations, alkalinity, and CO2 through the ocean-atmosphere system with the targeted application of high-precision high-throughput measurements of stable isotope ratios of magnesium (26Mg/24Mg), calcium (44Ca/42Ca), and potassium (41K/39K) by multi-collector inductively coupled plasma mass spectrometry (MC ICP-MS). Specific research topics that will be pursued are 1) Global sinks of Mg and K in authigenic marine clays, 2) Global fluxes of Mg and Ca associated with diagenesis of shallow-water carbonate sediments, and 3) Global fluxes of Mg and Ca in low temperature seafloor hydrothermal systems. Approaches include laboratory experiments as well as analysis of sediment and pore-fluid samples.

地球气候、全球碳循环和海水成分之间的反馈构成了在地球40亿年历史中维持宜居环境的主要机制之一。该项目旨在为我们理解海洋过程提供一个新的基础，海洋过程在调节地球化学循环方面发挥着重要但未被充分认识的作用。这项职业生涯奖的研究部分将涉及发展和应用新的分析方法和工具，以调查维持海洋化学平衡的一些最不为人所知的方法。CAREER奖还旨在支持特别强大的教育工作和研究与教育的整合。为此，希金斯与社区发展组织Isles， Inc.合作，在新泽西州特伦顿市提出了一项城市自来水教育监测计划。该项目将由Isles， Inc.员工、社区志愿者、特伦顿学生、普林斯顿本科生、首席研究员和博士后研究员组成的团队进行。学生们将通过调查家里自来水的化学成分来学习科学方法的步骤，了解科学工作背后的具体细节，并培养对科学如何赋予个人权力和影响社区的欣赏。该项目拟通过多收集器电感耦合等离子体质谱（MC ICP-MS）高精度、高通量测量镁（26Mg/24Mg）、钙（44Ca/42Ca）和钾（41K/39K）的稳定同位素比值，研究影响海洋-大气系统中阳离子、碱度和CO2流动的海洋过程。具体研究方向为：1)自生海相粘土中Mg和K的全球汇；2)与浅水碳酸盐沉积物成岩作用相关的Mg和Ca的全球通量；3)海底低温热液系统中Mg和Ca的全球通量。方法包括实验室实验以及沉积物和孔隙流体样品的分析。

项目成果

Low-temperature oceanic crust alteration and the isotopic budgets of potassium and magnesium in seawater

• DOI: 10.1016/j.epsl.2020.116290
• 发表时间: 2020-07
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Danielle P. Santiago Ramos;L. A. Coogan;Jack Geary Murphy;J. Higgins

Advected glacial seawater preserved in the subsurface of the Maldives carbonate edifice

马尔代夫碳酸盐大厦地下保存的平流冰川海水

• DOI: 10.1016/j.gca.2019.04.030
• 发表时间: 2019
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Blättler, Clara L.;Higgins, John A.;Swart, Peter K.
• 通讯作者: Swart, Peter K.

Quantifying early marine diagenesis in shallow-water carbonate sediments

• DOI: 10.1016/j.gca.2018.02.042
• 发表时间: 2018-09-01
• 期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
• 影响因子: 5
• 作者: Ahm, Anne-Sofie C.;Bjerrum, Christian J.;Higgins, John A.
• 通讯作者: Higgins, John A.

The Ca and Mg isotope record of the Cryogenian Trezona carbon isotope excursion

• DOI: 10.1016/j.epsl.2021.117002
• 发表时间: 2021-05-28
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Ahm, Anne-Sofie C.;Bjerrum, Christian J.;Higgins, John A.
• 通讯作者: Higgins, John A.

Experimental partitioning of Ca isotopes and Sr into anhydrite: Consequences for the cycling of Ca and Sr in subseafloor mid-ocean ridge hydrothermal systems

• DOI: 10.1016/j.gca.2018.03.018
• 发表时间: 2018-09
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: D. Syverson;D. Syverson;D. Syverson;Peter P. Scheuermann;J. Higgins;N. Pester;W. Seyfried