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Analysis of STCC eddies using the Okubo-Weiss parameter on model and satellite data

机译:使用Okubo-Weiss参数对模型和卫星数据进行STCC涡流分析

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摘要

The North Pacific Subtropical Counter Current (STCC) is a weak zonal current comprising of a weak eastward flow near the surface (with speeds of less than 0.1 m/s and a thickness of approximately 50-100 m) and westward flow (the North Equatorial Current) beneath. Previous studies (e.g., Qiu J Phys Oceanogr 29: 2471-2486, 1999) have shown that the STCC is baroclinically unstable. Therefore, despite its weak mean speeds, nonlinear STCC eddies with diameters ~300 km or larger and rotational speeds exceeding the eddy propagation speeds develop (Samelson J Phys Oceanogr 27: 2645-2662, 1997; Chelton et al. Prog Oceanogr 91:167-216,2011). In this study, the authors present numerical experiments to describe and explain the instability and eddy-generation processes of the STCC and the seasonal variation. Emphasis is on finite-amplitude eddies which are analyzed based on the parameter of Okubo (Deep-Sea Res 17: 445-454, 1970) and Weiss (Physica D 48: 273-294, 1991). The temperature and salinity distribution in March and April offer the favorable condition for eddies to grow, while September and October are unfavorable seasons for the generation of eddies. STCC is maintained not only by subsurface front but also by the sea surface temperature (SST) front. The seasonal variation of the vertical shear is dominated by the seasonal surface STCC velocity. The SST front enhances the instability and lead to the faster growth of STCC eddies in winter and spring. The near-surface processes are therefore crucial for the STCC system.
机译:北太平洋副热带逆流(STCC)是弱的纬向气流,包括地表附近的弱东流(速度小于0.1 m / s和厚度约50-100 m)和西流(北赤道)当前)。先前的研究(例如,Qiu J Phys Oceanogr 29:2471-2486,1999)显示STCC是斜压不稳定的。因此,尽管平均速度较弱,但仍会出现直径约300 km或更大且转速超过涡流传播速度的非线性STCC涡流(Samelson J Phys Oceanogr 27:2645-2662,1997; Chelton et al。Prog Oceanogr 91:167- 216,2011)。在这项研究中,作者提出了数值实验来描述和解释STCC的不稳定性和涡旋生成过程以及季节变化。重点是有限振幅涡流,该涡流是基于Okubo(Deep-Sea Res 17:445-454,1970)和Weiss(Physica D 48:273-294,1991)的参数进行分析的。 3月和4月的温度和盐分分布为涡流的生长提供了有利条件,而9月和10月则是涡流产生的不利季节。 STCC不仅通过地下前缘维护,而且通过海面温度(SST)前沿维护。垂直剪切的季节性变化主要由季节性表面STCC速度决定。 SST锋面增加了不稳定性,并导致冬季和春季STCC涡流的更快生长。因此,近地表过程对于STCC系统至关重要。

著录项

  • 来源
    《Ocean Dynamics》 |2014年第2期|259-271|共13页
  • 作者

    Yu-Lin Chang; Lie-Yauw Oey;

  • 作者单位

    National Taiwan Normal University, Taipei, Taiwan;

    National Central University, Jhongli City, Taiwan,Princeton University, Princeton, NJ, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    STCC; Eddy; Okubo-Weiss method;

    机译:STCC;涡流;大久保-魏斯法;

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