Collaborative Research: Satellite Assessment of CO2 Distribution, Variability and Flux and Understanding of Control Mechanisms in a River Dominated Ocean Margin

合作研究：卫星评估二氧化碳分布、变化和通量以及了解河流主导的海洋边缘的控制机制

• 批准号: 0752110
• 负责人: Wei-Jun Cai
• 金额: $ 30万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0752110&HistoricalAwards=false
• 关键词: Collaborative; Research; Satellite; Assessment; CO2

OCE-0752254OCE-0752110Margins receiving inputs from large rivers represent the extremes of continental shelf systems in carbon cycling and fluxes. Recent findings in the vicinity of the Mississippi River plume show highly variable carbon fluxes and highlight the need for greater spatial and temporal coverage, as well as an assessment of the underlying community metabolism driving patterns in surface CO2. Scientists from the University of Southern Mississippi and the University of Georgia propose to test the hypothesis that large river margin water columns exhibit extreme seasonal and spatial variability in air-sea CO2 fluxes, characterized by localized uptake driven largely by high rates of autotrophic production and loss of CO2 driven by high terrestrial inputs and heterotrophic respiration. Because of the extreme variability in this system, constructing and characterizing spatially and temporally integrated air-sea fluxes cannot be done by extrapolation or interpolation solely from discrete field measurements. As such, the investigators plan to carry out a multidisciplinary study that includes continuous, shipboard and satellite derived assessments of CO2 fluxes, as well as process measurements of planktonic net community metabolism, carbon fixation rates and box modeling to simulate river plume mixing to provide new estimates of the emissions and uptake of CO2 and the factors regulating these processes in coastal margins. As regards broader impacts, one postdoc from the University of Southern Mississippi and one graduate student from the University of Georgia would be supported and trained as part of this project.

OCE-0752254OCE-0752110从大河流接收输入的边际代表了大陆架系统碳循环和通量的极端情况。最近在密西西比河羽流附近的发现显示了高度可变的碳通量，并强调需要更大的空间和时间覆盖范围，以及对地表二氧化碳的潜在群落代谢驱动模式进行评估。 南密西西比大学和佐治亚大学的科学家提议检验这一假设，即大型河流边缘水柱在海气二氧化碳通量方面表现出极端的季节性和空间变化，其特点是局部吸收主要由高自养生产和损失率驱动由高陆地输入和异养呼吸驱动的二氧化碳。 由于该系统的极端可变性，无法仅通过离散现场测量的外推或内插来构建和表征空间和时间综合的空气-海洋通量。 因此，研究人员计划开展一项多学科研究，包括对二氧化碳通量进行连续、船载和卫星评估，以及浮游网络群落代谢、碳固定速率和箱模型的过程测量，以模拟河流羽流混合，以提供新的研究成果。对二氧化碳排放和吸收的估计以及沿海边缘调节这些过程的因素。 至于更广泛的影响，作为该项目的一部分，南密西西比大学的一名博士后和佐治亚大学的一名研究生将得到支持和培训。