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热带海洋学报 ›› 2020, Vol. 39 ›› Issue (3): 10-18.doi: 10.11978/2019056CSTR: 32234.14.2019056

• 海洋水文学 • 上一篇    下一篇

基于高分辨ROMS模式的黑潮延伸体次中尺度涡各向异性分析

周霄雯1, 曹海锦1(), 经志友2, 廖光洪1   

  1. 1. 河海大学海洋学院, 江苏 南京 210098
    2. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 510301;
  • 收稿日期:2019-06-17 修回日期:2019-12-13 出版日期:2020-05-10 发布日期:2020-05-19
  • 通讯作者: 曹海锦
  • 作者简介:周霄雯(1994—), 女, 山东省烟台市人, 硕士研究生, 从事中小尺度海洋过程研究。E-mail: zhouxw@hhu.edu.cn
  • 基金资助:
    国家重点研发计划(2017YFA0604104);热带海洋环境国家重点实验室(中科院南海海洋研究所)开放课题(LTO1907);中国博士后基金(2018M642148);江苏省博士后科研资助计划(2018K149C);国家自然科学基金(41776040);青岛海洋科学与技术试点国家实验室OCFL功能实验室开放课题(201804)

Anisotropy of submesoscale eddy in Kuroshio Extension based on high resolution ROMS output analysis

Xiaowen ZHOU1, Haijin CAO1(), Zhiyou JING2, Guanghong LIAO1   

  1. 1. College of Oceanography, Hohai University, Nanjing 210098, China
    2. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China;
  • Received:2019-06-17 Revised:2019-12-13 Online:2020-05-10 Published:2020-05-19
  • Contact: Haijin CAO
  • Supported by:
    The National Key Research and Development Program of China(2017YFA0604104);Opening Foundation of State Key Laboratory of Tropical Oceanography(South China Sea Institute of Oceanology, Chinese Academy of Sciences)(LTO1907);Chinese Postdoctoral Foundation(2018M642148);Jiangsu Planned Projects for Postdoctoral Research Funds(2018K149C);National Natural Science Foundation of China(41776040);Opening of OCFL Functional Laboratory of Qingdao Pilot National Laboratory of Marine Science and Technology(201804)

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摘要：

次中尺度过程的水平空间尺度约为0.1~10km, 时间尺度约为1天, 里查森数和罗斯贝数为0(1), 能有效地从中尺度环流中汲取能量向小尺度湍流串级, 并对上层海洋物质的垂向交换有着重要影响。本文基于水平分辨率为~500m的高分辨率ROMS(regional ocean modeling system)数值模拟结果, 采用方差椭圆方法, 评估了黑潮延伸体海域上层海洋次中尺度涡旋的各向异性特征, 并探讨了涡旋各向异性值的大小与次中尺度过程特征参数的相关性。研究结果表明, 黑潮延伸体主轴强流区域的次中尺度涡旋各向异性值明显小于两侧海域, 主轴区域的次中尺度涡旋特征明显强于流轴两侧海域, 各向异性值与次中尺度过程的强弱有着较为显著的负相关关系, 表明次中尺度过程具有较小的各向异性特征(更趋各向同性)。方差椭圆表征了涡与平均流相互作用过程中的能量反馈机制, 较大的各向同性特征意味着动能更趋正向串级。

关键词: 次中尺度过程, 黑潮延伸体, 涡旋各向异性, 能量串级, 上层海洋

Abstract:

Submesoscale eddies have smaller Richardson number and larger Rossby number, with horizontal scales between 0.1 and 10 km and time scale of ~0(1 day). They act to extract energy from the mesoscale circulation, drive forward energy cascade to the smaller scale turbulence and meanwhile contribute to the vertical flux of what in the upper ocean. In this study, anisotropy of submesoscale eddies in the Kuroshio Extension in a high-resolution simulation (?x≈500m) by the regional ocean modeling system (ROMS) is evaluated using the nummular variance ellipse method. A correlation between eddy anisotropy and submesoscale features is also analyzed. The results show that the submesoscale eddies, as well as the anisotropy, near the flow stream get intensified compared to those in the flanks. The isotropic ratio is well correlated with the strength of submesoscale processes, suggesting that the submesoscale processes tend to be isotropic. The nummular variance ellipse, known as the feedback of eddies to mean flow, may implies forward cascade of kinetic energy.

Key words: submesoscale eddy, Kuroshio Extension, eddy anisotropy, energy cascade, upper ocean