Feedbacks between N2 fixation and denitrification in a non-Redfield Earth system model and impacts on the oceanic fixed-N inventory in a changing climate

非雷德菲尔德地球系统模型中氮固定和反硝化之间的反馈以及气候变化中对海洋固定氮库存的影响

• 批准号: 447794210
• 负责人: Dr. Chia-Te Chien
• 金额: --
• 依托单位: Forschungseinheit Biogeochemische Modellierung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/447794210?language=en
• 关键词: Feedbacks; between; N2; fixation; denitrification

How and how strongly marine N2 fixation and denitrification are coupled to each other is key to understanding and projecting the oceanic NO3 – inventory and biological pump in a changing climate. While current modeling works predict a strong coupling between N2 fixation and denitrification, the recently developed optimality-based non-Redfield ecosystem model (OPEM) coupled to the UVic- ESCM shows much weaker coupling between them. This project aims to identify those factors and mechanisms that control the coupling, and to understand how the coupling might change in different climate settings. The new model will be applied to pre-industrial, the last glacial maximum and present-day conditions to evaluate the model in terms of the sensitivity of the oceanic nitrogen inventory and the biological carbon pump to different climate states. The ultimate goal is to better understand the controls on the oceanic nitrogen inventory and to provide improved projections of future marine biogeochemistry and its impacts on atmospheric pCO2.

如何以及如何强烈的海洋固氮和反硝化相互耦合是关键的理解和预测海洋NO3 -库存和生物泵在不断变化的气候。虽然目前的模拟工作预测N2固定和反硝化之间的强耦合，最近开发的基于优化的非Redfield生态系统模型（OPEM）耦合到UVic-ESCM显示它们之间的耦合弱得多。该项目旨在确定控制耦合的因素和机制，并了解耦合如何在不同的气候环境中变化。新的模型将应用于工业化前，末次冰期最大和现今的条件，以评估海洋氮库存和生物碳泵对不同气候状态的敏感性。最终目标是更好地了解对海洋氮库存的控制，并提供未来海洋生物地球化学及其对大气pCO 2的影响的改进预测。