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首页> 外文期刊>Ocean Dynamics >Effects of the air-sea coupling time frequency on the ocean response during Mediterranean intense events
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Effects of the air-sea coupling time frequency on the ocean response during Mediterranean intense events

机译：地中海强烈事件期间海气耦合时间频率对海洋响应的影响

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摘要

The near-sea surface meteorological conditions associated with the Mediterranean heavy precipitation events constitute, on a short time scale, a strong forcing on the ocean mixed layer. This study addresses the question of the optimal time frequency of the atmospheric forcing to drive an ocean model in order to make it able to capture the fine scale ocean mixed layer response to severe meteorological conditions. The coupling time frequency should allow the ocean model to reproduce the formation of internal low-salty boundary layers due to sudden input of intense precipitation, as well as the cooling and deepening of the ocean mixed layer through large latent heat fluxes and stress under the intense low-level jet associated with these events. In this study, the one-dimensional ocean model is driven by 2.4-km atmospheric simulated fields on a case of Mediterranean heavy precipitation, varying the time resolution of the atmospheric forcing. The results show that using a finer temporal resolution than 1 h for the atmospheric forcing is not necessary, but a coarser temporal resolution (3 or 6 h) modifies the event course and intensity perceived by the ocean. Consequently, when using a too coarse temporal resolution forcing, typically 6 h, the ocean model fails to reproduce the ocean mixed layer fine scale response under the heavy rainfall pulses and the strong wind gusts.
机译：与地中海强降水事件相关的近海地表气象条件在短时间内构成了对海洋混合层的强烈强迫。这项研究解决了强迫大气驱动海洋模型的最佳时间频率的问题，以使其能够捕获对恶劣气象条件的精细尺度海洋混合层响应。耦合时间频率应使海洋模型能够再现由于强降水的突然输入而形成的内部低盐分界层的形成，以及通过强潜热通量和强应力下的应力使海洋混合层冷却和加深与这些事件有关的低空急流。在这项研究中，一维海洋模型是由一个2.4 km的大气模拟场驱动的，该场模拟了地中海的强降水，改变了大气强迫的时间分辨率。结果表明，对于大气强迫，没有必要使用比1 h更好的时间分辨率，但是更粗糙的时间分辨率（3或6 h）会改变海洋感知的事件过程和强度。因此，当使用太粗糙的时间分辨率强迫（通常为6小时）时，海洋模型无法在强降雨脉冲和强阵风的情况下重现海洋混合层的精细尺度响应。

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  • 来源
    《Ocean Dynamics》 |2009年第4期|539-549|共11页
  • 作者

    Cindy Lebeaupin Brossicr; Veronique Ducrocq; Herve Giordani;

  • 作者单位

    Centre National de Recherches Meteorologiques/Groupe d'etude de l'Atmosphere MeteorologiquE (Meteo-France/CNRS), 42 avenue G. Coriolis, 31057 Toulouse cedex, France;

    Centre National de Recherches Meteorologiques/Groupe d'etude de l'Atmosphere MeteorologiquE (Meteo-France/CNRS), 42 avenue G. Coriolis, 31057 Toulouse cedex, France;

    Centre National de Recherches Meteorologiques/Groupe d'etude de l'Atmosphere MeteorologiquE (Meteo-France/CNRS), 42 avenue G. Coriolis, 31057 Toulouse cedex, France;

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

    air-sea coupling; mediterranean sea mesoscale modeling; temporal resolution;

    机译：海海耦合;地中海中尺度模拟;时间分辨率;

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