Influence of interannual atmospheric forcing on North Pacific biogeochemical variability

年际大气强迫对北太平洋生物地球化学变化的影响

• 批准号: 0550771
• 负责人: LuAnne Thompson
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-15 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550771&HistoricalAwards=false
• 关键词: Influence; interannual; atmospheric; forcing; North

In this research project, investigators at the University of Washington will study the sensitivity of the North Pacific carbon cycle to changes in physical atmospheric forcing over the past few decades. Decade-scale changes in the North Pacific carbon cycle and related processes have been well documented through direct observations. Basic questions remain, however, about the controlling mechanisms, and little is known about the relationship between surface and thermocline variability. The investigators are motivated by a series of recent indications from both models and observations that fresh water forcing due to changes in the hydrological cycle plays an important role in the decadal variability of tracers of carbon cycle processes in both surface and thermocline waters. This issue can now be addressed using newly published historical ocean salinity trends. In addition, valuable data emerging from the CLIVAR program allows the relationships between changes in biogeochemical variability in surface waters and in the ocean interior to be explored.The research plan will involve hind cast simulations with an ocean circulation/biogeochemical model to examine the sensitivity of surface carbon cycle parameters and interior distributions of O2 and DIC to changes in sea surface salinity as well as nutrients. The investigators have previously developed a model for investigations of physical-biogeochemical variability in the North Pacific basin. While the model currently has no carbon cycle, it does have biogeochemical cycles of nutrients and oxygen that are able to reproduce the climatological O2 and nutrient distributions, as well as the overall pattern of thermocline O2 changes observed during the late 20th century. The straightforward addition of a carbon cycle to the model therefore builds on a demonstrated capacity to capture important modes of physical and biogeochemical variability.The results of these sensitivity experiments will then be assessed through a detailed comparison of model output to observed carbon cycle variability in the North Pacific based on ocean time series stations, together with data from the CLIVAR/CO2 Repeat Hydrography Program. This effort will take advantage of established collaborations with leading experimental carbon cycle scientists at the Pacific Marine Environmental Laboratory. Finally, the research team will conduct a series of attribution experiments to isolate and characterize the contribution of physical, biological and chemical processes to simulated carbon variability.Although the study itself will be regionally specific, the study should have broader impacts for the study of the global ocean carbon cycle and related phenomena. The emphasis on the spatial signatures and relative importance of different processes controlling ocean carbon cycle variability should inform the community-wide understanding of the variability of the global carbon cycle. The project will support a young postdoctoral investigator and a beginning graduate student.

在该研究项目中，华盛顿大学的研究人员将研究北太平洋碳循环对过去几十年来发生物理大气强迫变化的敏感性。 北太平洋碳周期和相关过程的十年规模变化已通过直接观察得到很好的证明。但是，关于控制机制的基本问题仍然存在，并且对表面变异性之间的关系知之甚少。 研究人员的动机是由模型的一系列迹象和观察结果进行的，即由于水文循环的变化而引起的淡水强迫在地表和热跃层水中碳循环过程的十年变化中起着重要作用。现在可以使用新发表的历史海洋盐度趋势来解决此问题。 In addition, valuable data emerging from the CLIVAR program allows the relationships between changes in biogeochemical variability in surface waters and in the ocean interior to be explored.The research plan will involve hind cast simulations with an ocean circulation/biogeochemical model to examine the sensitivity of surface carbon cycle parameters and interior distributions of O2 and DIC to changes in sea surface salinity as well as nutrients.研究人员先前已经开发了一个模型，用于研究北太平洋盆地的物理生物地球化学变异性。尽管该模型目前没有碳循环，但它确实具有能够再现气候O2和养分分布的营养和氧气的生物地球化学周期，以及20世纪后期观察到的热级O2变化的整体模式。因此，在模型中直接添加碳循环是基于捕获物理和生物地球化学可变性的重要模式的能力。然后，将通过将模型输出与观察到的基于海洋时间序列的北太平洋碳周期变异性的详细比较与Clivar/Co2重复图的数据以及来自北太平洋的碳周期变异性进行详细比较来评估这些敏感性实验的结果。这项努力将利用与太平洋海洋环境实验室的领先实验性碳循环科学家建立合作。最后，研究团队将进行一系列归因实验，以隔离并表征物理，生物学和化学过程对模拟碳变异性的贡献。尽管该研究本身将在区域特定方面进行，但该研究应对全球海洋碳循环和相关现象的研究产生更大的影响。 强调控制海洋碳循环变异性的不同过程的空间签名和相对重要性，应为社区范围内的全球碳循环变异性的理解提供信息。该项目将支持一位年轻的博士后调查员和初学者。