Understanding the consequences of changing phytoplankton elemental use efficiencies for global ocean biogeochemistry

生物海洋学的一个主要重点是了解和量化温度和资源可获得性对世界海洋浮游植物生产力和生态系统动力学的影响。经典范式，如Eppley的温度曲线以及LieBig和Monod的资源响应关系，都很好地服务于该领域，但它们未能捕捉到资源可获得性和温度对初级生产的影响的全部动态和交互性质。对于地球系统模型师来说，这一缺陷尤其成问题，因为他们迫切地试图估计未来的海洋生产力水平，这些水平是海洋生态系统预测变化的基础，这些特性是向政策制定者提供信息所必需的，例如IPCC和IPBES的评估报告。该提案描述了两位美国海洋微生物学家和一位来自英国的生物地球化学建模师密切协调的合作项目，该项目将应用元素利用效率(EUE)这一新兴概念，将灵活的热和资源限制响应集成到新一代地球系统模型中。EUE被定义为单位时间内每单位细胞营养资源中固定的碳量。这一简单但新颖的概念提供了一个独特的机会，可以在海洋模型中综合观测到的同时变暖和营养物质可获得性变化对初级生产力的影响，以量化在快速变化的海洋环境中的生物地球化学和生物反应。

A major focus of biological oceanography is to understand and quantify the effects of temperature and resource availability on phytoplankton productivity and ecosystem dynamics in the world ocean. Classic paradigms like Eppley's temperature curve and the resource response relationships of Liebig and Monod have served the field well, but they fail to capture the full dynamic and interactive nature of resource availability and temperature influences on primary production. This shortcoming is especially problematic for earth system modelers as they urgently try to estimate future oceanic productivity levels that underpin projected changes in the ocean ecosystem, properties that are needed to inform policy makers such as the assessment reports of the IPCC and IPBES. This proposal describes a closely coordinated collaborative project between two U.S. marine microbiologists and a biogeochemical modeler from the U.K. that will apply the emergent concept of Elemental Use Efficiencies (EUEs) to integrate flexible thermal and resource limitation responses into a new generation of earth system models. EUEs are defined as the amount of carbon fixed, per unit of cellular nutrient resource, per unit time. This simple, yet novel concept provides a unique opportunity to integrate the observed consequences of concurrent warming and altered nutrient availability for primary productivity in ocean models to quantify biogeochemical and biological responses in the rapidly changing ocean environment.