海洋混合层深度演变评估框架

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Advances in Modeling Earth Systems Pub Date : 2024-10-06 DOI:10.1029/2023MS004198
Alexandre Legay, Bruno Deremble, Thierry Penduff, Pierre Brasseur, Jean-Marc Molines
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引用次数: 0

摘要

海洋表层混合层作为热量、盐分、动量和营养物质从表层进入或流出深海的入口,起着至关重要的作用。在本研究中,我们引入了一个框架,用于评估混合层深度(MLD)在现实作用力和先决条件下的演变。我们的方法涉及一个基于物理的参数空间,由三个无量纲数定义:λs 代表浮力通量和海气界面风应力的相对贡献;Rh 理查森数表征水柱相对于风切变的稳定性;f/Nh 表征地球自转的重要性(科里奥利频率 f 与皮层分层 Nh 之比)。根据 MLD 的归一化时间演化值,定义了四种 MLD 演化机制("限制"、"稳定"、"加深 "和 "强加深")。我们在一维模拟中评估了三维参数空间,发现仅考虑两个维度(λs、Rh)是三维参数空间二维投影的最佳选择。然后,我们展示了这一二维 λs - Rh 参数空间在比较三维现实海洋模拟中的实用性:我们讨论了水平分辨率(1°、1/12° 或 1/60°)和 Gent-McWilliams 参数化对 MLD 演化机制的影响。最后,将观测数据作为真理的概念验证表明了如何将参数空间用于模型校准。
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A Framework for Assessing Ocean Mixed Layer Depth Evolution

The ocean surface mixed layer plays a crucial role as an entry or exit point for heat, salt, momentum, and nutrients from the surface to the deep ocean. In this study, we introduce a framework to assess the evolution of the mixed layer depth (MLD) for realistic forcings and preconditioning conditions. Our approach involves a physically-based parameter space defined by three dimensionless numbers: λs representing the relative contribution of the buoyancy flux and the wind stress at the air-sea interface, Rh the Richardson number which characterizes the stability of the water column relative to the wind shear, and f/Nh which characterizes the importance of the Earth's rotation (ratio of the Coriolis frequency f and the pycnocline stratification Nh). Four MLD evolution regimes (“restratification,” “stable,” “deepening,” and “strong deepening”) are defined based on the values of the normalized temporal evolution of the MLD. We evaluate the 3D parameter space in the context of 1D simulations and we find that considering only the two dimensions (λs, Rh) is the best choice of 2D projection of this 3D parameter space. We then demonstrate the utility of this two-dimensional λs − Rh parameter space to compare 3D realistic ocean simulations: we discuss the impact of the horizontal resolution (1°, 1/12°, or 1/60°) and the Gent-McWilliams parameterization on MLD evolution regimes. Finally, a proof of concept of using observational data as a truth indicates how the parameter space could be used for model calibration.

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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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