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Evolution of Turbulence in the Diurnal Warm Layer

机译：日暖层湍流的演变

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摘要

The daily evolution of temperature, stratification, and turbulence in the diurnal warm layer is described from time series measurements at low to moderate winds and strong insolation in the equatorial Indian Ocean. At 2.0-m depth, turbulence dissipation rates (epsilon) decreased by two orders of magnitude over 1-2 h immediately after sunrise, initiated by stratification caused by penetrating solar radiation prior to the change in sign of net surface heat flux from cooling to warming. Decaying turbulence preceded a period of rapid growth, in which e increased by two orders of magnitude over a few hours, and following which e approached a daytime period of near-steady state. Decay and growth rates predicted by a simplified turbulence model are consistent with those observed. During the daytime period of near-steady state, asymmetric temperature ramps were associated with enhanced epsilon, supporting the interpretation that this period represents a balance between buoyancy and shear production associated with a shear-driven response to trapping of momentum within the diurnal warm layer.
机译：在赤道印度洋，从低到中风和强日照的时间序列测量描述了昼间暖层中温度，分层和湍流的每日演变。在深度为2.0 m时，日出后立即在1-2 h内湍流耗散率（ε）下降了两个数量级，这是由于穿透前的太阳辐射引起的分层导致的，这是由于从冷却到变暖的净表面热通量变化之前。衰减湍流先于快速增长期，在此期间e在几个小时内增加了两个数量级，此后e接近白天的近似稳态。简化湍流模型预测的衰减和增长率与观察到的一致。在白天接近稳态期间，温度不对称与ε升高有关，支持了以下解释：这一时期代表了浮力和剪切力之间的平衡，这与剪切力驱动的对日间暖层内动量的响应有关。

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    《Journal of Physical Oceanography》 |2018年第2期|383-396|共14页
  • 作者

    Moulin Aurelie J.; Moum James N.; Shroyer Emily L.;

  • 作者单位

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

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