What Controls the Variability of the Southern Ocean Productivity and Carbon Uptake?

是什么控制着南大洋生产力和碳吸收的变化？

• 批准号: 1142009
• 负责人: Takamitsu Ito
• 金额: $ 35.82万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1142009&HistoricalAwards=false
• 关键词: What; Controls; Variability; Southern; Ocean

The variability of the biological productivity and correspondingly the carbon uptake, including fossil fuel CO2, of the Southern Ocean are hampered by our incomplete understanding of the responses of the marine ecosystems to physical forcings, oceanic transport and climate change. This modeling study will address three main questions: i) what are the mechanism that link climate dynamics and biological production? ii) what are the mechanisms for micronutrient iron limitation and the relative importance of different iron sources? and iii) what are the roles of mesoscale eddies on regional carbon and iron budgets? Based on the MIT ocean general circulation model (MITgcm), eddy permitting (1/60 x 1/60 lat lon; 42 depth levels) physical circulation fields from the Southern Ocean State Estimate will be constrained by a very large observational data set of Southern ocean properties. Model simulations, with improved representations of iron sources from continental shelves, and including the interplay between increasing partial pressure (pCO2) in the atmosphere and upwelling of cold CO2 rich waters, will be tested against the observed variability of surface chlorophyll and biogeochemical tracers. This research should yield a more authentic estimate of the carbon, and iron budgets for recent and future years. Educational aspect of the project will train a graduate student and undergraduate student interns in earth-system modeling at Georgia Institute of Technology.

由于我们对海洋生态系统对物理强迫、海洋运输和气候变化的反应的不完全了解，南大洋生物生产力和相应的碳吸收（包括化石燃料二氧化碳）的可变性受到阻碍。这项建模研究将解决三个主要问题：i）连接气候动态和生物生产的机制是什么？ ii) 微量营养素铁限制的机制是什么以及不同铁源的相对重要性？ iii) 中尺度涡流对区域碳和铁预算的作用是什么？根据麻省理工学院海洋大气环流模型 (MITgcm)，南大洋状态估计的涡流允许（1/60 x 1/60 lat lon；42 个深度级别）物理环流场将受到南大洋非常大的观测数据集的约束。海洋属性。模型模拟将根据观察到的表面叶绿素和生物地球化学示踪剂的变化进行测试，该模型模拟改进了对大陆架铁源的描述，包括大气中分压（pCO2）增加与富含二氧化碳的冷海水上涌之间的相互作用。这项研究应该对近几年和未来几年的碳和铁预算产生更真实的估计。该项目的教育方面将在佐治亚理工学院培训研究生和本科生实习生进行地球系统建模。