热带海洋学报

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低频风应力强迫减弱数值模式中厄尔尼诺多样性

张琪1, 连涛123   

  1. 1.自然资源部第二海洋研究所,杭州 浙江 310000;

    2.上海交通大学,上海 200000;

    3.南方海洋科学与工程广东省实验室(珠海),珠海 广东 519000

  • 收稿日期:2022-02-25 修回日期:2022-04-08 出版日期:2022-04-21 发布日期:2022-04-21
  • 通讯作者: 张琪
  • 基金资助:
    国家自然科学基金资助项目(42022043);浙江省自然科学基金资助项目(LR19D060001)

Low-Frequency Wind Stress Forcing Reduces El Niño Diversity in numerical model

Zhang Qi1,  Lian Tao1,2,3   

  1. 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China

    2. School of Oceanography, Shanghai Jiao Tong University, Shanghai, China

    3.  Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China

  • Received:2022-02-25 Revised:2022-04-08 Online:2022-04-21 Published:2022-04-21
  • Contact: Qi ZHANG
  • Supported by:

     the National Natural Science Foundation of China (42022043) ; the Zhejiang Provincial Natural Science Foundation of China (LR19D060001)

摘要: 厄尔尼诺-南方涛动(El Ni?o-Southern Oscillation ,ENSO)同时包括低频海气耦合过程和高频天气尺度过程,但是ENSO动力学中的非线性过程阻碍了两者在ENSO发展过程中的定量研究。在最近的一项研究中,学者提出了在线低通滤波技术,以去除模式中大气-海洋耦合过程中风应力的高频部分,从而可以用于衡量纯低频的大气-海洋相互作用对ENSO动力学的影响。通过在线低通滤波模块和离线低通滤波模块的模式模拟对比,发现去除高频风强迫可以延长ENSO周期,降低El Nino多样性。结果表明,高频过程在El Nino多样性的形成中起着至关重要的作用。

关键词: 耦合模式, 在线低通滤波, 厄尔尼诺-南方涛动

Abstract: The El Ni?o-Southern Oscillation (ENSO) includes both low-frequency ocean-atmosphere coupling and high-frequency processes, yet the nonlinearity in ENSO dynamics prevents any quantitative estimation of the contributions of the two to ENSO development. The online low-frequency filtering technique was proposed in a recent work to exclude the high-frequency part of wind stress during atmosphere-ocean coupling in model, thus can be used to scale the impact of the pure low-frequent atmosphere-ocean interaction on ENSO dynamics. By comparing model simulations with and without the online low-pass filtering module, we found that removing the high-frequency wind forcing prolongs ENSO period and decreases El Nino diversity. The results confirm that the high-frequency momentum processes play the crucial role in the genesis of El Ni?o diversity.

Key words: coupling model, online low-frequent filtering, ENSO