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首页> 外文期刊>Journal of Physical Oceanography >Role of Near-Inertial Internal Waves in Subthermocline Diapycnal Mixing in the Northern Gulf of Mexico
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Role of Near-Inertial Internal Waves in Subthermocline Diapycnal Mixing in the Northern Gulf of Mexico

机译：墨西哥北部湾近惯性内波在亚热线跃迁混合中的作用

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摘要

Moored ADCP data collected in the northern Gulf of Mexico are analyzed to examine near-inertial internal waves and their contribution to subthermocline diapycnal mixing based on a finescale parameterization of deep ocean mixing. The focus of the study is on the impact of near-inertial internal waves generated by an extreme weather eventthat is, Hurricane Katrinaand by month-to-month variation in weather patterns on the diapycnal mixing. The inferred subthermocline diapycnal mixing exhibits pronounced elevation in the wake of Katrina. Both the increased near-inertial (0.8-1.8f, where f is the Coriolis frequency) and superinertial (>1.8f) shear variances contribute to the elevated diapycnal mixing, but the former plays a more dominant role. The intense wind work on near-inertial motions by the hurricane is largely responsible for the energetic near-inertial shear variance. Energy transfer from near-inertial to superinertial internal waves, however, appears to play an important role in elevating the superinertial shear variance. The inferred subthermocline diapycnal mixing in the region also exhibits significant month-to-month variation with the estimated diffusivity in January 2006 about 3 times the values in November and December 2005. The subseasonal change in the diapycnal mixing mainly results from the subseasonal variation of the near-inertial wind work that causes intensification of the near-inertial shear in January 2006.
机译：根据深海混合的精细参数化，分析了在墨西哥湾北部收集的系泊ADCP数据，以检查近惯性内波及其对亚热线斜向混合的贡献。研究的重点是极端天气事件（即卡特里娜飓风）产生的近惯性内波的影响，以及天气模式逐月变化对二面体混合的影响。在卡特里娜飓风之后，推断的亚高温曲线二吡py醛混合显示出明显的升高。近惯性（0.8-1.8f，其中f为科里奥利频率）的增加和超惯性（> 1.8f）的剪切方差都有助于增加辉石混合，但前者起着更主要的作用。飓风对近惯性运动产生的强风功是造成高能近惯性剪切变化的主要原因。但是，能量从近惯性到内惯性内波的传递似乎在提高惯性内剪切方差中起着重要作用。推断的该区域的亚地西莫卡因混合浓度也表现出明显的逐月变化，2006年1月的估计扩散率约为2005年11月和2005年12月值的3倍。导致2006年1月近惯性剪切强度增强的近惯性风功。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第12期|3137-3154|共18页
  • 作者

    Jing Zhao; Chang Ping; DiMarco Steven F.; Wu Lixin;

  • 作者单位

    Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA|Ocean Univ China, Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao, Peoples R China;

    Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA|Ocean Univ China, Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao, Peoples R China;

    Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA|Texas A&M Univ, Geochem & Environm Res Grp, College Stn, TX 77843 USA;

    Ocean Univ China, Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao, Peoples R China;

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

    Circulation; Dynamics; Diapycnal mixing; Hurricanes; Internal waves;

    机译：循环;动力学;透纳混合;飓风;内波;

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