北西太平洋吕宋岛暗流垂直混合参数化

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Xianliang Chen, Jianping Gan, Chiwing Hui, James C. McWilliams
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引用次数: 0

摘要

吕宋暗流(LUC)是西太平洋北部(WPO)最重要的西边界暗流之一,对于次表层水输送和连接副热带-赤道环流至关重要。在过去的三十年中,在揭示 LUC 基本特征方面取得了大量观测进展。然而,LUC 的动力学和成功建模问题仍然悬而未决。在这项工作中,我们利用中国海多尺度海洋模拟系统对 WPO 环流进行了高分辨率(3 公里,60 层)数值研究。我们特别关注了垂直混合问题,旨在通过修改垂直混合参数化来合理解决LUC问题。基于物理推理和基于物理建模的实验,我们设计了一种自适应混合方案(AMS),该方案在热层中使用了一个类似于芒克的函数,以增强小理查森数区域的垂直混合。利用自适应混合方案,我们很好地再现了两层 WPO 环流,并捕捉到了与观测结果一致的 LUC 的近岸部分。此外,我们还通过分析动量平衡研究了陆缘环流的动力学,发现陆缘环流主要是由西部边界附近强烈的温跃层倾斜导致的气压梯度力维持的。在这一高度剪切的区域,增强的垂直混合为维持 LUC 提供了足够的地营支持。此外,非线性和次中尺度运动也对 LUC 起了积极作用。这项工作推进了对海流-暗流系统的物理理解,提高了捕捉 LUC 和 WPO 环流的数值能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Parameterization of the Vertical Mixing for the Luzon Undercurrent in the Northern Western Pacific Ocean

Parameterization of the Vertical Mixing for the Luzon Undercurrent in the Northern Western Pacific Ocean

The Luzon Undercurrent (LUC) is one of the most significant western boundary undercurrents in the northern western Pacific Ocean (WPO), essential for subsurface water transport and connecting subtropical–equatorial circulations. Over the last three decades, abundant observational progress has been made in revealing the basic features of the LUC. However, the dynamics and thus successful modeling of the LUC remain unresolved. In this work, we conducted a high-resolution (3 km, 60 levels) numerical investigation of the WPO circulation using the China sea multi-scale ocean modeling system. We paid particular attention to the vertical mixing, aiming to reasonably resolve the LUC by modifying the vertical mixing parameterization. Based on physics reasoning and experiments of physically based modeling, we designed an adaptive mixing scheme (AMS), which used a Munk-like function in the thermocline for enhanced vertical mixing in the areas of small Richardson numbers. Using the AMS, we reproduced the two-layer WPO circulations well and captured the inshore component of the LUC consistent with observations. Furthermore, we studied the dynamics of the LUC by analyzing the momentum balance and found that the LUC is primarily maintained by baroclinic pressure gradient force due to strong thermocline tilting near the western boundary. Enhanced vertical mixing in this highly sheared region crucially provides sufficient geostrophic support to sustain the LUC. Also, nonlinearity and submesoscale motions contribute positively to the LUC. This work advances physical understanding of the current-undercurrent system and improves numerical capability in capturing the LUC and WPO circulations.

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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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