Collaborative Research: How Temporal Changes in River Discharge and Storms Affect the Source and Age Distribution of Sedimentary Organic Carbon Across a River-Dominated Margin
合作研究:河流流量和风暴的时间变化如何影响河流边缘沉积有机碳的来源和年龄分布
基本信息
- 批准号:0223226
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2002
- 资助国家:美国
- 起止时间:2002-09-01 至 2005-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Continental margins are dynamic regions that receive inputs of organic carbon derived from both terrestrial and marine sources. Once introduced by the Mississippi or fixed on the Louisiana shelf, POC is carried along the shelf, decomposed, buried, or transported to deeper regions in the Gulf of Mexico. Based on coastal primary production estimates and riverine inputs, only 20-50% of the organic carbon in coastal waters off the Mississippi is actually buried in Louisiana shelf sediments, and 40% of that buried carbon is of terrestrial origin. Thus, the fate of 50-80% of the carbon fraction delivered by the Mississippi that cannot be accounted for in shelf sediments remains a key question in developing a North American carbon budget. Under this funding, the PIs propose a combined approach of compound-specific stable and radiocarbon isotopic techniques and biomarker distributions to evaluate fates and transport of organic carbon in the Mississippi River delta shelf and slope. The working hypothesis of this study is that seasonal changes in the composition and age of SOC across the Louisiana shelf/slope are largely determined by pulses in terrestrially- and marine-derived organic carbon which occur at distinct time periods controlled by changes in Mississippi River discharge and storm energy.
大陆边缘是动态区域,接收来自陆地和海洋来源的有机碳输入。一旦由密西西比河引入或固定在路易斯安那陆架上,POC 就会沿着陆架被携带、分解、掩埋或运输到墨西哥湾更深的区域。根据沿海初级生产估计和河流输入,密西西比州沿海水域中只有 20-50% 的有机碳实际上埋藏在路易斯安那陆架沉积物中,其中 40% 的埋藏碳来自陆地。因此,密西西比河输送的 50-80% 碳部分的命运无法在陆架沉积物中加以解释,这仍然是制定北美碳预算时的一个关键问题。在这笔资金的支持下,PI提出了一种结合特定化合物稳定和放射性碳同位素技术以及生物标记物分布的方法,以评估密西西比河三角洲陆架和斜坡中有机碳的命运和运输。本研究的工作假设是,路易斯安那陆架/斜坡上 SOC 的组成和年龄的季节性变化很大程度上是由陆地和海洋来源的有机碳的脉冲决定的,这些脉冲发生在密西西比河流量和风暴能量变化控制的不同时间段。
项目成果
期刊论文数量(0)
专著数量(0)
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会议论文数量(0)
专利数量(0)
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Stuart Wakeham其他文献
Acceptance of the 2021 Alfred E. Treibs Award by Stuart Wakeham
斯图尔特·韦克厄姆接受 2021 年阿尔弗雷德·E·特里布奖
- DOI:
10.1016/j.gca.2024.01.011 - 发表时间:
2024-06-15 - 期刊:
- 影响因子:5.000
- 作者:
Stuart Wakeham - 通讯作者:
Stuart Wakeham
Stuart Wakeham的其他文献
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{{ truncateString('Stuart Wakeham', 18)}}的其他基金
Collaborative Research: Microbial Biomarkers at the Chemocline of the Cariaco Basin: Linking Organic Geochemistry and Microbial Ecology
合作研究:卡里亚科盆地化学跃层的微生物生物标志物:有机地球化学和微生物生态学的联系
- 批准号:
0550654 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Proposal: Mineral Ballast and Organic Matter Compositions as Determinants of Particle Settling Velocities and Fluxes in the Sea (MedFlux)
合作提案:矿物压载物和有机物成分作为海洋中颗粒沉降速度和通量的决定因素 (MedFlux)
- 批准号:
0622730 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: Anthropogenic Impacts on Carbon Cycling in the Sacramento-San Joaquin River Delta- Changes in Source, Nature and Age of Organic Carbon
合作研究:人为对萨克拉门托-圣华金河三角洲碳循环的影响——有机碳的来源、性质和年龄的变化
- 批准号:
0454741 - 财政年份:2005
- 资助金额:
-- - 项目类别:
Continuing grant
Effect of Mineral Ballast and Particle Sinking Velocity on Organic Carbon Export and Remineralization
矿物压载物和颗粒下沉速度对有机碳输出和再矿化的影响
- 批准号:
0424827 - 财政年份:2005
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: A Quantitative Assessment of Mineral Ballasts in Carbon Export and Remineralization
合作研究:碳输出和再矿化中矿物压载物的定量评估
- 批准号:
0136318 - 财政年份:2002
- 资助金额:
-- - 项目类别:
Continuing grant
Biomarker and Isotope Studies of Organic Matter Cycling in the Black Sea: A Focus on Bacteria and Archaea
黑海有机物循环的生物标志物和同位素研究:重点关注细菌和古细菌
- 批准号:
0117824 - 财政年份:2001
- 资助金额:
-- - 项目类别:
Standard Grant
Molecular and Isotopic Coupling between Pelagic and Benthic Carbon Cycling-a Proof of Concept
远洋和底栖碳循环之间的分子和同位素耦合——概念证明
- 批准号:
9911678 - 财政年份:2000
- 资助金额:
-- - 项目类别:
Standard Grant
Chemolytic Analysis of Macromolecular Organic Matter--A Proof of Concept
大分子有机物的化学分析--概念验证
- 批准号:
9617411 - 财政年份:1997
- 资助金额:
-- - 项目类别:
Continuing grant
Organic Geochemical Studies in the Southern Ocean
南大洋有机地球化学研究
- 批准号:
9531759 - 财政年份:1996
- 资助金额:
-- - 项目类别:
Continuing grant
Controls on the Isotopic Composition of Phytoplankton
浮游植物同位素组成的控制
- 批准号:
9615744 - 财政年份:1996
- 资助金额:
-- - 项目类别:
Continuing grant
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