Collaborative Research: Southeast Pacific and Southern Ocean Seawater Isotopes Determined from US GEOTRACES GP17-OCE and GP17-ANT Samples
合作研究:从美国 GEOTRACES GP17-OCE 和 GP17-ANT 样品中测定东南太平洋和南大洋海水同位素
基本信息
- 批准号:2049577
- 负责人:
- 金额:$ 30.68万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-07-01 至 2024-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The stable isotopic composition of the oxygen atom in seawater (d18O) is controlled by evaporation, precipitation, and riverine or glacial meltwater input. Most of the deep interior water masses in the ocean are formed or modified in the Southern Ocean and sink to fill the deep layers that circulate throughout the world’s oceans. The d18O signatures in seawater can be used as tracers for these sub-surface water masses once they sink to depth. The Southern Ocean and South Pacific are critical locations for water mass formation and thus, for understanding global overturning circulation, carbon cycling and climate dynamics. However, data on the d18O of seawater, particularly in the sub-surface, is virtually nonexistent for the South Pacific and Southern Ocean. Moreover, our understanding of past temperature and oceanic processes based on the d18O signature in marine carbonates (e.g. corals and foraminifera) have relied on the assumption that variations in the oxygen isotopic composition of the sub-surface water masses are nominal through time, which can be directly tested on a wider basis using new technologies during this project. Investigators will conduct analyses of seawater d18O from samples collected from depth transects during the US GEOTRACES science expedition to the South Pacific (GP17-OCE) and the Amundsen Sea sector of the Antarctic continental margin (GP17-ANT). This ocean region is of particular significance because it is experiencing rapid environmental changes in the past few decades, including the fastest melting of ice shelves around the entire Antarctic. This project will support the development of diverse involvement in teaching and outreach efforts in a primarily undergraduate and Hispanic serving institution. The outreach activities will provide ample opportunities to engage students from underrepresented groups in both formal and informal settings. It is well-established from first principles that d18O and d2H of seawater have a positive relationship to salinity, but regional variations in the isotopic relationship of seawater to salinity are poorly constrained. Temperature reconstructions relying on d18O in calcite microfossils biologically precipitated in equilibrium with seawater and preserved in marine sediments are only quantitative if the seawater d18O (d18Osw) in which that carbonate was precipitated is known. Despite the reliance of these paleo-estimations on the d18O of modern seawater, surface measurements are few and far between and sub-surface data in the South Pacific and Southern Oceans is even more limited. Filling this fundamental gap in data to quantify the influence of precipitation, evaporation and glacial melt water on the d18O and d2H of interior seawater masses is globally relevant to our understanding of ocean circulation and broader climate dynamics. The development and improvement of new laser-based spectroscopy techniques such as off-axis integrated cavity output spectroscopy (OA-ICOS) and cavity ring-down spectroscopy, allows for seawater d18O and d2H analyses to be run quickly and cost effectively compared to traditional IRMS (Isotope Ratio Mass Spectrometry). A core aim of this project is to compare and contrast IRMS and OA-ICOS analyses to address accuracy, precision and offsets between methods. Obtaining d18Osw directly contributes to the GP17-OCE stated aims of characterizing near- and far-field trace element and isotope (TEI) inputs and to the GP17-ANT stated aims of quantifying gradients in TEI distributions and characterizing, glacial meltwater inputs in the Amundsen Sea and Southern Ocean.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.
海水中氧原子(d18 O)的稳定同位素组成受蒸发、降水和河流或冰川融水输入的控制。海洋中的大多数深层内陆水团都是在南大洋形成或改变的,并下沉填充在世界各大洋中循环的深层。海水中的d18 O特征可以用作这些次表层水团的示踪剂,一旦它们下沉到深度。南大洋和南太平洋是水团形成的关键位置,因此,对于了解全球翻转环流,碳循环和气候动态。然而,关于海水d18 O的数据,特别是在次表层,几乎不存在南太平洋和南大洋。此外,我们根据海洋碳酸盐(如珊瑚和有孔虫)中的d18 O特征对过去温度和海洋过程的理解依赖于这样一种假设,即地下水体的氧同位素组成随时间的变化是名义上的,这可以在本项目期间使用新技术在更广泛的基础上直接进行测试。调查人员将对美国GEOTRACES科学考察南太平洋(GP 17-OCE)和南极大陆边缘阿蒙森海(GP 17-ANT)期间从深度断面收集的样本进行海水d18 O分析。这一海洋区域具有特别重要的意义,因为它在过去几十年中正在经历快速的环境变化,包括整个南极周围冰架融化最快。该项目将支持在主要是本科和西班牙裔服务机构的教学和推广工作的多样化参与的发展。外联活动将提供充分的机会,让代表性不足群体的学生在正式和非正式场合参与进来。海水的d18 O和d2 H与盐度之间存在正相关关系,但海水与盐度之间的同位素关系的区域变化受到很大的限制。温度重建依赖于d18 O的方解石微化石生物沉淀在海水中的平衡,并保存在海洋沉积物中,只有定量的海水d18 O(d18 Osw),其中碳酸盐沉淀是已知的。尽管这些古估计依赖于现代海水的d18 O,但表面测量很少,而且南太平洋和南大洋的次表面数据更加有限。填补这一数据的根本空白,以量化降水,蒸发和冰川融水对内部海水质量的d18 O和d2 H的影响,这与我们对海洋环流和更广泛的气候动力学的理解具有全球相关性。新型激光光谱技术的发展和改进,如离轴集成腔输出光谱(OA-ICOS)和腔衰荡光谱,使海水d18 O和d2 H分析与传统的IRMS(同位素比质谱法)相比,运行速度更快,成本更低。该项目的核心目标是比较和对比IRMS和OA-ICOS分析,以解决方法之间的准确度,精度和偏移。获得d18 Osw直接有助于GP 17-OCE规定的表征近场和远场痕量元素和同位素(TEI)输入的目标,以及GP 17-ANT规定的量化TEI分布中的梯度和表征的目标,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知识产权进行评估来支持。优点和更广泛的影响审查标准。
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)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Elisabeth Sikes其他文献
How the ocean exhales
海洋是如何呼气的
- DOI:
10.1038/495454a - 发表时间:
2013-03-27 - 期刊:
- 影响因子:48.500
- 作者:
Elisabeth Sikes - 通讯作者:
Elisabeth Sikes
Elisabeth Sikes的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Elisabeth Sikes', 18)}}的其他基金
Collaborative Research: Determining climate related changes in water mass structure, paleoventilation, and paleocirculation in the Southeast Indian and Southern Oceans
合作研究:确定东南印度洋和南大洋与气候相关的水团结构、古通风和古环流变化
- 批准号:
2231146 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Determining climate related changes in water mass structure, paleoventilation, and paleocirculation in the Southeast Indian and Southern Oceans
合作研究:确定东南印度洋和南大洋与气候相关的水团结构、古通风和古环流变化
- 批准号:
1940962 - 财政年份:2020
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Diversifying geochemistry – travel support for students from under-represented constituencies to attend the Goldschmidt Conference; 2020-2022
地球化学多元化——为来自代表性不足选区的学生参加戈德施密特会议提供旅行支持;
- 批准号:
2018087 - 财政年份:2020
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Disentangling physical and biological controls on Indian Ocean carbon storage during the last glacial-interglacial transition
合作研究:理清末次冰期-间冰期过渡期间印度洋碳储存的物理和生物控制
- 批准号:
2002642 - 财政年份:2020
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Provenance of Alkenones & Holocene Temperature Evolution of the NW Atlantic
合作研究:烯酮的来源
- 批准号:
2022462 - 财政年份:2020
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Coring in the Southwest Indian and Southern Oceans to examine climate driven changes in watermass paleoventilation, sources, and structure
合作研究:在西南印度洋和南大洋取芯,以研究气候驱动的水体古通风、来源和结构的变化
- 批准号:
1559080 - 财政年份:2017
- 资助金额:
$ 30.68万 - 项目类别:
Continuing Grant
Collaborative Research: Pacific Ocean stratification since the last ice age: New constraints from benthic foraminifera
合作研究:上一个冰河时代以来的太平洋分层:来自底栖有孔虫的新限制
- 批准号:
1634047 - 财政年份:2016
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Radiocarbon content of the Southwest Pacific and Southern Ocean waters in the Holocene and late Quaternary
合作研究:全新世和晚第四纪西南太平洋和南大洋水域的放射性碳含量
- 批准号:
0823487 - 财政年份:2008
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Controls on Alkenone Temperature Estimates in Subtropical and Subpolar Waters
合作研究:副热带和副极地水域烯酮温度估计的控制
- 批准号:
0726048 - 财政年份:2007
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
ADVANCE Fellow: Evaluating the Importance of Lateral Transport on Alkenone Temperature Reconstructions in the late Quaternary
高级研究员:评估横向传输对第四纪晚期烯酮温度重建的重要性
- 批准号:
0340676 - 财政年份:2004
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
相似国自然基金
Research on Quantum Field Theory without a Lagrangian Description
- 批准号:24ZR1403900
- 批准年份:2024
- 资助金额:0.0 万元
- 项目类别:省市级项目
Cell Research
- 批准号:31224802
- 批准年份:2012
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research
- 批准号:31024804
- 批准年份:2010
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research (细胞研究)
- 批准号:30824808
- 批准年份:2008
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Research on the Rapid Growth Mechanism of KDP Crystal
- 批准号:10774081
- 批准年份:2007
- 资助金额:45.0 万元
- 项目类别:面上项目
相似海外基金
Collaborative Research: Reevaluating the Timing and Driver of Escarpment Retreat in Southeast Australia
合作研究:重新评估澳大利亚东南部悬崖后退的时机和驱动因素
- 批准号:
2347491 - 财政年份:2024
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Reevaluating the Timing and Driver of Escarpment Retreat in Southeast Australia
合作研究:重新评估澳大利亚东南部悬崖后退的时机和驱动因素
- 批准号:
2347490 - 财政年份:2024
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
RaMP: STEGG-INTERACT: Southeast Texas Evolutionary Genetics and Genomics INTEgrative Research and Collaborative Training
RaMP:STEGG-INTERACT:德克萨斯州东南部进化遗传学和基因组学综合研究和协作培训
- 批准号:
2319694 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Ultra-High Resolution Paleostreamflow in Southeast Asia--Proxy/Model Comparison
合作研究:东南亚超高分辨率古水流——代理/模型比较
- 批准号:
2302669 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: The Relationship between the Trade Wind Inversion Layer and the Seasonal Development of the Southeast Pacific Inter-Tropical Convergence Zone (ITCZ)
合作研究:信风逆温层与东南太平洋热带辐合带(ITCZ)季节发展的关系
- 批准号:
2303227 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Determining climate related changes in water mass structure, paleoventilation, and paleocirculation in the Southeast Indian and Southern Oceans
合作研究:确定东南印度洋和南大洋与气候相关的水团结构、古通风和古环流变化
- 批准号:
2231146 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: The Relationship between the Trade Wind Inversion Layer and the Seasonal Development of the Southeast Pacific Inter-Tropical Convergence Zone (ITCZ)
合作研究:信风逆温层与东南太平洋热带辐合带(ITCZ)季节发展的关系
- 批准号:
2303225 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Are Bornean Areas of Endemism the Evolutionary Source of Southeast Asias Remarkable Terrestrial Biodiversity?
合作研究:婆罗洲特有地区是东南亚显着陆地生物多样性的进化源泉吗?
- 批准号:
2244753 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: Determining climate related changes in water mass structure, paleoventilation, and paleocirculation in the Southeast Indian and Southern Oceans
合作研究:确定东南印度洋和南大洋与气候相关的水团结构、古通风和古环流变化
- 批准号:
2230999 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant
Collaborative Research: The Relationship between the Trade Wind Inversion Layer and the Seasonal Development of the Southeast Pacific Inter-Tropical Convergence Zone (ITCZ)
合作研究:信风逆温层与东南太平洋热带辐合带(ITCZ)季节发展的关系
- 批准号:
2303226 - 财政年份:2023
- 资助金额:
$ 30.68万 - 项目类别:
Standard Grant