Collaborative Research: Photodegradation of Dissolved Organic Matter and its Contribution to Surface Water CO2 fluxes and the Carbon Cycle in a River Dominated Ocean Margin

合作研究:溶解有机物的光降解及其对地表水二氧化碳通量和以河流为主的海洋边缘碳循环的贡献

基本信息

项目摘要

Ocean margins are highly dynamic systems at the land-sea-air interfaces, and they play a disproportionately large role in global carbon fluxes among these reservoirs. River dominated margins receive large quantities of terrigenous dissolved organic matter (DOM) and its chromophoric component (CDOM) that is highly photoreactive and appears to be largely remineralized to CO2 in margin surface waters. Despite the recognized importance of photochemical processes in river dominated margins, the overall significance of photochemistry in surface water CO2 fluxes remains uncertain. In this project, researchers at the University of South Carolina at Columbia and the University of Georgia will develop regional-scale estimates of photochemical and coupled photochemical-microbial carbon (including CO2 and CO) fluxes and removal of terrigenous DOM and CDOM in surface waters of the northern Gulf of Mexico margin. This ocean margin receives major contributions of terrigenous DOM (3 Tg C yr-1) and CDOM from the Mississippi River system. Specific objectives include determination of apparent quantum yields (AQY) for the photoproduction of CO2 and CO, the photochemical removal of DOC, and the coupled photochemical-microbial removal of DOC. Experimentally determined AQYs will be used in combination with field measurements, satellite imagery, and modeling to provide temporally-integrated, regional-scale assessments of photochemically-mediated carbon fluxes in the study region. The project will include improvement of remote-sensing algorithms and the development of regional-scale models for ocean margin carbon cycling. Once developed, this approach can be utilized to provide similar assessments in other river dominated ocean margins. At sea, the project will utilize a ship of opportunity and integrate with a currently funded study investigating total CO2-fluxes and biological processes in the northern Gulf of Mexico margin. This coordination of projects will provide an unprecedented opportunity for understanding the fundamental physical, biological, and photochemical processes controlling air-sea CO2 fluxes in a major river dominated margin. Broader Impacts: Measuring carbon fluxes (specifically CO2 and CO) in ocean margins and identifying the fundamental factors driving these fluxes have been identified as of great importance by the North American Carbon Program and Ocean Carbon and Climate Change programs. This project will provide regional estimates of photochemical and coupled photochemical-microbial carbon fluxes in surface waters of one of the major river dominated margins of the North American continent. This project will provide training, experience and support for a graduate student at each institution. Both principal investigators teach undergraduate and graduate classes that cover various aspects of the carbon cycle, and data collected from this project will be used as specific examples in these classes. This approach of incorporating information from active research programs into the classroom has proven to be very effective for increasing student interest in science and has encouraged undergraduate participation in research.
海洋边缘是陆地-海洋-空气界面上的高度动态系统,它们在这些库之间的全球碳通量中发挥着不成比例的巨大作用。以河流为主的边缘接受大量的陆源溶解有机物 (DOM) 及其发色成分 (CDOM),这些成分具有高度光反应性,并且似乎在边缘地表水中大部分再矿化为二氧化碳。尽管人们认识到光化学过程在河流主导边缘的重要性,但光化学在地表水二氧化碳通量中的总体意义仍然不确定。在该项目中,南卡罗来纳大学哥伦比亚分校和佐治亚大学的研究人员将对墨西哥湾北部边缘地表水中的光化学和耦合光化学-微生物碳(包括CO2和CO)通量以及陆源DOM和CDOM的去除进行区域尺度的估计。该海洋边缘受到来自密西西比河系统的陆源 DOM (3 Tg C yr-1) 和 CDOM 的主要贡献。具体目标包括测定光产生 CO2 和 CO、光化学去除 DOC 以及光化学-微生物耦合去除 DOC 的表观量子产率 (AQY)。实验确定的 AQY 将与现场测量、卫星图像和建模结合使用,以提供研究区域光化学介导的碳通量的时间综合、区域规模评估。该项目将包括改进遥感算法和开发海洋边缘碳循环的区域尺度模型。一旦开发出来,这种方法可用于在其他河流主导的海洋边缘提供类似的评估。在海上,该项目将利用一艘机遇船,并与目前资助的一项研究相结合,该研究调查墨西哥湾北部边缘的总二氧化碳通量和生物过程。这种项目协调将为了解控制主要河流边缘地区海气二氧化碳通量的基本物理、生物和光化学过程提供前所未有的机会。更广泛的影响:北美碳计划以及海洋碳和气候变化计划认为,测量海洋边缘的碳通量(特别是二氧化碳和二氧化碳)并确定驱动这些通量的基本因素非常重要。该项目将对北美大陆主要河流边缘之一的地表水中的光化学和光化学-微生物耦合碳通量进行区域估计。该项目将为每个机构的研究生提供培训、经验和支持。 两位主要研究人员教授本科生和研究生课程,涵盖碳循环的各个方面,从该项目收集的数据将用作这些课程的具体示例。事实证明,这种将活跃研究项目的信息融入课堂的方法对于提高学生对科学的兴趣非常有效,并鼓励本科生参与研究。

项目成果

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Ronald Benner其他文献

Evolving Paradigms in Biological Carbon Cycling in the Ocean
  • DOI:
    doi: 10.1093/nsr/nwy074
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    20.6
  • 作者:
    Chuanlun Zhang;Hongyue Dang;Farooq Azam;Ronald Benner;Louis Legendre;Uta Passow;Luca Polimene;Carol Robinson;Curtis A. Suttle;Nianzhi Jiao
  • 通讯作者:
    Nianzhi Jiao
Sources, distributions, and early diagenesis of sedimentary organic matter in the Pearl River region of the South China Sea
南海珠江区沉积有机质来源、分布及早期成岩作用
  • DOI:
    10.1016/j.marchem.2013.11.003
  • 发表时间:
    2014-01
  • 期刊:
  • 影响因子:
    3
  • 作者:
    Yulong Zhang;Karl Kaiser;Li Li;Dainan Zhang;Yong Ran;Ronald Benner
  • 通讯作者:
    Ronald Benner
Dynamics of microbial biomass and activity in five habitats of the Okefenokee Swamp ecosystem
  • DOI:
    10.1007/bf02012941
  • 发表时间:
    1987-11-01
  • 期刊:
  • 影响因子:
    4.000
  • 作者:
    Mary Ann Moran;A. E. Maccubbin;Ronald Benner;Robert E. Hodson
  • 通讯作者:
    Robert E. Hodson
Temporal relationship between the deposition and microbial degradation of lignocellulosic detritus in a Georgia salt marsh and the Okefenokee Swamp
  • DOI:
    10.1007/bf02011172
  • 发表时间:
    1986-09-01
  • 期刊:
  • 影响因子:
    4.000
  • 作者:
    Ronald Benner;A. E. Maccubbin;Robert E. Hodson
  • 通讯作者:
    Robert E. Hodson
Correction to: The roles of microorganisms in litter decomposition and soil formation
  • DOI:
    10.1007/s10533-024-01118-2
  • 发表时间:
    2024-01-19
  • 期刊:
  • 影响因子:
    3.700
  • 作者:
    Satoru Hobara;Takashi Osono;Dai Hirose;Kenta Noro;Mitsuru Hirota;Ronald Benner
  • 通讯作者:
    Ronald Benner

Ronald Benner的其他文献

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{{ truncateString('Ronald Benner', 18)}}的其他基金

Collaborative research: Does dissolved organic matter influence the concentrations and distributions of trace elements in the Arctic Ocean?
合作研究:溶解有机物是否影响北冰洋微量元素的浓度和分布?
  • 批准号:
    1504137
  • 财政年份:
    2015
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Standard Grant
The Microbial Carbon Pump and Bacterial Carbon Sequestration in the Ocean
海洋中的微生物碳泵和细菌固碳
  • 批准号:
    1233373
  • 财政年份:
    2012
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Standard Grant
Collaborative Research (ETBC): Climate Warming and Northern Peatland Decomposition, Accumulation and Carbon Sequestration Examined Through Molecular and Paleohydrological Analysis
合作研究(ETBC):通过分子和古水文分析检查气候变暖和北部泥炭地的分解、积累和碳封存
  • 批准号:
    0843417
  • 财政年份:
    2009
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Standard Grant
Collaborative research: Chromophoric dissolved organic matter (CDOM) and lignin phenols as tracers of water masses and biogeochemical processes in the Arctic Ocean
合作研究:发色溶解有机物(CDOM)和木质素酚作为北冰洋水团和生物地球化学过程的示踪剂
  • 批准号:
    0713915
  • 财政年份:
    2007
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Standard Grant
Evolution of Hydrogen-Based Microbial Communities in Deep Hydrothermal Aquifers
深层热液含水层中氢基微生物群落的演化
  • 批准号:
    0310606
  • 财政年份:
    2003
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Standard Grant
Collaborative Research: Biogeochemical Cycling of Particulate and Dissolved Organic Matter in the Arctic Ocean Using Molecular Markers
合作研究:利用分子标记对北冰洋颗粒物和溶解有机物进行生物地球化学循环
  • 批准号:
    0125301
  • 财政年份:
    2002
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Continuing Grant
Sources, Abundance, and Transformations of Amino Sugars in Marine Organic Matter
海洋有机物中氨基糖的来源、丰度和转化
  • 批准号:
    0080782
  • 财政年份:
    2000
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Continuing Grant
Chemical Characterization and Reactivity of Dissolved Organic Matter in Seawater
海水中溶解有机物的化学特征和反应性
  • 批准号:
    0096102
  • 财政年份:
    1999
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Continuing Grant
What Are the Sources and Significance of Dissolved Organic Carbon and Nutrient Signals Within the Arctic Basin?
北极盆地内溶解有机碳和营养物信号的来源和意义是什么?
  • 批准号:
    9996438
  • 财政年份:
    1999
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Continuing Grant
Characterization of Dissolved Organic Matter in Seawater by Ultrafiltration and Chemical Analysis
通过超滤和化学分析表征海水中溶解的有机物
  • 批准号:
    0096082
  • 财政年份:
    1999
  • 资助金额:
    $ 25.38万
  • 项目类别:
    Continuing Grant

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合作研究:REU 地点:地球与行星科学和天体物理学 REU 与纽约市立大学合作,位于美国自然历史博物馆
  • 批准号:
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