AbstractThe spatial and temporal variability of energy exchange in Tropical Instability Waves (TIWs) in the Atl'/> Revisiting tropical instability wave variability in the Atlantic ocean using SODA reanalysis
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Revisiting tropical instability wave variability in the Atlantic ocean using SODA reanalysis

机译：利用SODA重新分析重新探究大西洋中的热带不稳定波变异性

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摘要

AbstractThe spatial and temporal variability of energy exchange in Tropical Instability Waves (TIWs) in the Atlantic Ocean were investigated. A spectral analysis was used to filter the 5-day mean results from Simple Ocean Data Assimilation (SODA) reanalysis spanning from 1958 to 2008. TIWs were filtered over periods of 15 to 60 days and between wavelengths of 4 and 20 longitude degrees. The main approach of this study was the use of bidirectionally filtered TIW time series as the perturbation fields, and the difference in these time series from the SODA total results was considered to be the basic state for energetics analysis. The main result was that the annual cycle (period of ~ 360 days) was the main source of variability of the waves, and the semi-annual cycle (period of ~ 180 days) was a secondary variation, which indicated that TIWs occurred throughout the year but with intensity that varies seasonally. In SODA, barotropic instability acts as the mechanism that feeds and extracts energy to/from TIWs at equatorial Atlantic. Baroclinic instability is the main mechanism that extracts energy from TIWs to the equatorial circulation north of the Equator. All TIW patterns of variability were observed western of ~ 10° W. The present study reveals new evidences regarding TIW variability and suggests that future investigations should include a detailed description of TIW dynamics as part of Atlantic Ocean equatorial circulation.
机译： Abstract 热带不稳定性波（TIW）中能量交换的时空变化对大西洋进行了调查。光谱分析用于过滤1958年至2008年的简单海洋数据同化（SODA）再分析的5天平均结果。TIW在15至60天的时间段内以及在4度和20度经度之间进行过滤。这项研究的主要方法是使用双向滤波的TIW时间序列作为扰动场，这些时间序列与SODA总结果的差异被认为是能量分析的基本状态。主要结果是年周期（〜360天为周期）是海浪变化的主要来源，而半年周期（〜180天为周期）是次生变化，这表明TIW发生在整个海浪中。一年，但强度随季节而变化。在SODA中，正压不稳定是向赤道大西洋的TIW馈送能量或从中提取能量的机制。斜压不稳定是从TIW提取能量到赤道以北赤道环流的主要机制。在〜10°W以西观察到了所有TIW变异性模式。本研究揭示了有关TIW变异性的新证据，并建议未来的研究应包括对TIW动力学的详细描述，作为大西洋赤道环流的一部分。

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  • 来源
    《Ocean Dynamics》 |2018年第3期|327-345|共19页
  • 作者

    Hatsue Takanaca de Decco; Audalio Rebelo Torres Junior; Luciano Ponzi Pezzi; Luiz Landau;

  • 作者单位

    Laboratório de Métodos Computacionais em Engenharia (LAMCE), Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa em Engenharia, Universidade Federal do Rio de Janeiro;

    Instituto de Ciências do Mar, Universidade Federal do Maranhão;

    Instituto Nacional de Pesquisas Espaciais (INPE), SERE II – OBT, Instituto Nacional de Pesquisas Espaciais – INPE;

    Laboratório de Métodos Computacionais em Engenharia (LAMCE), Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa em Engenharia, Universidade Federal do Rio de Janeiro;

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  • 正文语种 eng
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  • 关键词

    Atlantic Tropical instabilities; Equatorial Atlantic; Equatorial waves;

    机译：大西洋热带动荡;赤道大西洋;赤道海浪;

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