Collaborative Research: Diagnosing the Role of Ocean Eddies in Carbon Cycling from a High-resolution Data Assimilating Ocean Biogeochemical Model

合作研究：从高分辨率数据同化海洋生物地球化学模型诊断海洋涡流在碳循环中的作用

• 批准号: 2149500
• 负责人: Don Chambers
• 金额: $ 28.84万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-03-01 至 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2149500&HistoricalAwards=false
• 关键词: Collaborative; Research; Diagnosing; Role; Ocean

The Southern Ocean accounts for ~40% of the total ocean uptake of anthropogenic carbon dioxide despite covering only 20% of the global ocean surface, and is particularly rich in long-lived eddies. These eddies, or large ocean whirlpools which can be observed from space, can alter air-sea fluxes of carbon dioxide in ways that are not yet fully understood. New observations from autonomous platforms measuring ocean carbon content suggest that there is significant heterogeneity in ocean carbon fluxes which can be linked to these dynamic eddy features. Due to computational and time limitations, ocean eddies are not explicitly represented in most global climate simulations, limiting our ability to understand the role eddies play in the ocean carbon cycle. This study will explore the impact of eddies on ocean carbon content and air-sea carbon dioxide fluxes in the Southern Ocean using both simulated- and observation-based strategies and the findings will improve our understanding of the ocean’s role in the carbon cycle and in global climate. While this work will primarily be focused on the Southern Ocean, the results will be globally applicable. The researchers will also broaden interest in physical and chemical oceanography among middle school-age girls in the University of South Florida’s Oceanography Camp for Girls by augmenting existing lessons with computational methods in oceanography. This project aims to quantify the impacts of mesoscale eddy processes on ocean carbon content and air-sea carbon dioxide (CO2) fluxes in the Southern Ocean. For the modeling component, the investigators will explore relationships between eddies, ocean carbon content, and air-sea CO2 fluxes within the 1/6-degree resolution Biogeochemical Southern Ocean State Estimate (B-SOSE). They investigators will produce high-resolution composites of the carbon content and physical structure within both cyclonic and anticyclonic eddies by region, quantify the influence of these eddies on the overall simulated air-sea CO2 flux, and diagnose the physical mechanisms driving this influence. For the observational component, the investigators will match eddies observed via satellite altimetry to ocean carbon observations and characterize observed relationships between eddies and ocean carbon content with a focus on Southern Ocean winter observations where light limits biological processes, allowing isolation of the contribution of physical processes. This work will also provide motivation for higher resolution and better eddy parameterizations in climate models, more mesoscale biogeochemical observations, and integration of satellite sea surface height data into efforts to map air-sea fluxes of CO2. Each summer, the PI delivers a lab lesson at the University of South Florida Oceanography Camp for Girls, recognized by NSF as a “Model STEM Program for Women and Girls” focused on broadening participation by placing emphasis on recruiting a diverse group of young women. As part of this project, the existing interactive Jupyter Notebook-based Python coding Lab lesson will be augmented with a B-SOSE-themed modeling component, which will broaden interest in physical and chemical oceanography and data science, and expose campers to computational methods in oceanography.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

尽管仅覆盖了全球海洋表面的20％，但南洋占人为二氧化碳的总海洋吸收的约40％，并且特别丰富。这些涡流或可以从空间观察到的大海洋漩涡可以以尚未完全了解的方式改变二氧化碳的空气通量。测量海洋碳含量的自主平台的新观察结果表明，海洋碳通量存在明显的异质性，可以与这些动态涡流特征相关。由于计算和时间限制，在大多数全球气候模拟中没有明确表示海洋涡流，从而限制了我们了解涡流在海洋碳循环中所起的作用的能力。这项研究将使用基于模拟的策略和基于观察的策略探索涡流对海洋碳含量和海洋二氧化碳通量的影响，这些发现将改善我们对海洋在碳循环和全球气候中的作用的理解。尽管这项工作将主要集中在南大洋上，但结果将在全球范围内适用。研究人员还将通过通过海洋学的计算方法来扩大现有的课程，从而扩大南佛罗里达大学海洋学训练营的中学女孩和化学海洋学的兴趣。该项目旨在量化南大洋对海洋碳含量和海洋二氧化碳（CO2）通量的影响。对于建模组件，研究人员将探索1/6度分辨率的生物地球化学南大洋国家估算（B-SOSE）之间的涡流，海洋碳含量和空气二氧化碳通量之间的关系。他们的研究人员将按地区循环和反气旋涡流中的碳含量和物理结构产生高分辨率的组成，量化这些涡流对整体模拟空气SEA CO2通量的影响，并诊断出促进这种影响的物理机制。对于观测成分，研究人员将通过卫星高度法观察到的涡流与海洋碳观测值相匹配，并将观察到的涡流与海洋碳含量之间的关系表征，重点关注南方海洋冬季观测，其中光线限制了生物学过程，从而可以隔离物理过程的贡献。这项工作还将为气候模型，更多的中尺度生物地球化学观测以及将卫星海面高度数据整合到努力以绘制二氧化碳的空气通量的努力中，为更高分辨率和更好的涡流参数提供动力。每年夏天，PI都会在南佛罗里达大学的女孩训练营进行实验室课程，并被NSF认可为“妇女和女孩的模型STEM计划”，重点是招募一群潜水员的年轻女性，以扩大参与。作为该项目的一部分，现有的基于B-Sose主题的建模组件将增强基于Python笔记本的互动式jupyter笔记本，这将扩大人们对物理和化学海洋学和数据科学的兴趣，并使露营者在海洋学的计算方法中揭示了NSF的法定任务和诚实的良好态度，这是通过评估良好的支持者的范围。