海洋漩涡怎么可能如此持久

IF 0.7 Q4 OCEANOGRAPHY
G. G. Sutyrin
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引用次数: 0

摘要

意图这篇文章的目的是在洋流强烈波动的背景下,无论罗斯比波的色散特征如何,从理论上证明世界海洋中单个涡旋的惊人寿命(长达5年)。方法和结果。斜压涡旋的演化是在β平面地形斜坡上的混合双层海洋模型中考虑的。在具有强位涡异常的上层,假设洋流是平衡的;在周位涡异常的低层,用传统的准地转近似来描述海流。分析描述了嵌入垂直剪切流中的缓慢演变的几乎圆形的涡旋,该剪切流是海洋亚热带的典型特征。该理论表明斜压涡旋之后是如何产生背风-罗斯比波的。穿过平均流的涡旋漂移主要由所代表的解的斜压偶极子结构来调节;与Rossby波辐射相关的涡流能量损失可以通过存储在平均电流中的能量来补偿。结论。所构建的模型为具有强位涡异常的海洋涡旋的典型能量漂移和转移提供了合理的估计。通过斜压平均流的能量直接支持长寿命涡旋,无论其稳定性如何,对于更好地理解与地球物理涡旋显著长寿命相关的物理机制及其运动特征具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Каким образом океанические вихри могут быть столь долгоживущими
Purpose. The article is aimed at substantiating theoretically amazing longevity (up to 5 years) of the individual vortices in the World Ocean against the background of strong fluctuations of the ocean currents and regardless of the Rossby wave dispersion features. Methods and Results. Evolution of the baroclinic vortices is considered in a hybrid two-layer ocean model over a topographic slope on the beta-plane. In the upper layer with strong potential vorticity anomalies, the currents are assumed to be balanced; in the lower layer at week potential vorticity anomalies, the currents are described in the traditional quasi-geostrophic approximation. Slow evolving almost circular vortices embedded in a vertically sheared current typical of the subtropical part of the ocean are described analytically. The theory shows how a baroclinic vortex is followed by the lee Rossby waves. The vortex drift across the mean current is conditioned mainly by the baroclinic-dipole structure of the represented solution; at that the vortex energy loss related to the Rossby wave radiation can be compensated by the energy stored in the mean currents. Conclusions. The constructed model provides reasonable estimates of the energy drift and transfer typical of the ocean vortices with strong anomalies of potential vorticity. Direct support of long-lived vortices by the energy of the baroclinic mean flows irrespective of their stability, is of great importance for better understanding the physical mechanisms relating to significant longetivity of the geophysical vortices and the features of their movement.
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
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