Atlantic Meridional Overturning Circulation: Inferences from Satellite Gravimetry and Numerical Ocean Models for North Atlantic Deep Water Transports (AMOCING)

大西洋经向翻转环流：卫星重力测量和北大西洋深水运输数值海洋模型的推论 (AMOCING)

• 批准号: 417199189
• 负责人: Dr. Henryk Dobslaw
• 金额: --
• 依托单位: Sektion 1.3: Erdsystem-Modellierung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/417199189?language=en
• 关键词: Atlantic; Meridional; Overturning; Circulation; Inferences

In the wake of improvements to the non-tidal background model AOD1B during the first phase of NEROGRAV, IP2 will focus on the detectability of subtle ocean bottom pressure (OBP) signatures of the meridional overturning circulation in the North Atlantic. Specifically, we will (1) elucidate the nature of the broad-scale OBP signals governing the Landerer et al. (2015) GRACE estimate for Lower North Atlantic Deep Water (Lower NADW, depths ~3–5 km) transport anomalies, using adjoint gradient decomposition in a general circulation model, and (2) map the OBP signatures of the main NADW flow (~1–3 km) on the narrow western continental slope with a dedicated collection of numerical ocean models. These ventures will allow us to analyze newly available gravity field time series from NEROGRAV, and the international science community, for peak NADW transports over the GRACE/GRACE-FO mission periods, and eventually derive threshold/breakthrough requirements for monitoring Atlantic overturning circulation changes with future satellite gravity missions.

在NEROGRAV第一阶段对非潮汐背景模式AOD1B进行改进之后，IP2将重点关注北大西洋经向翻转环流的细微海底压力（OBP）特征的可探测性。具体而言，我们将(1)阐明控制Landerer等人（2015）GRACE估计北大西洋深水（Lower NADW，深度~ 3-5 km）运输异常的大尺度OBP信号的性质，使用一般环流模式中的随附梯度分解；(2)利用专门的数值海洋模式集合绘制狭窄的西部大陆斜坡上主要NADW流（~1 - 3 km）的OBP特征。这些项目将使我们能够分析来自NEROGRAV和国际科学界的最新可用重力场时间序列，以了解GRACE/GRACE- fo任务期间NADW传输的峰值，并最终得出阈值/突破要求，以便在未来的卫星重力任务中监测大西洋翻转环流变化。