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首页> 外文期刊>Journal of Physical Oceanography >Sea Surface Roughness and Drag Coefficient as Functions of Neutral Wind Speed
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Sea Surface Roughness and Drag Coefficient as Functions of Neutral Wind Speed

机译：海面粗糙度和阻力系数作为中性风速的函数

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摘要

Near the surface, it is commonly believed that the behavior of the (turbulent) atmospheric flow can be well described by a constant stress layer. In the case of a neutrally stratified surface layer, this leads to the well-known logarithmic wind profile that determines the relation between near-surface wind speed and magnitude of stress. The profile is set by a surface roughness length, which, over the ocean surface, is not constant; rather, it depends on the underlying (ocean wave) sea state. For instance, at the European Centre for Medium-Range Weather Forecasts this relation is parameterized in terms of surface stress itself, where the scale is set by kinematic viscosity for light wind and a Charnock parameter for strong wind. For given wind speed at a given height, the determination of the relation between surface wind and stress (expressed by a drag coefficient) leads to an implicit equation that is to be solved in an iterative way. In this paper a fit is presented that directly expresses the neutral drag coefficient and surface roughness in terms of wind speed without the need for iteration. Since the fit is formulated in purely dimensionless quantities, it is able to produce accurate results over the entire range in wind speed, level height, and values for the Charnock parameter for which the implicit set of equations is believed to be valid.
机译：在地表附近，通常认为（湍流）大气流动的行为可以由恒定应力层很好地描述。对于中性分层的表层，这导致了众所周知的对数风廓线，该对数​​风廓线确定了近地表风速和应力大小之间的关系。该轮廓由表面粗糙度长度设定，该表面粗糙度在海洋表面上不是恒定的；它可以是任意的。相反，它取决于潜在的（海浪）海洋状态。例如，在欧洲中距离天气预报中心，这种关系是根据表面应力本身进行参数化的，其中比例由轻风的运动粘度和强风的夏诺克参数设置。对于给定高度处的给定风速，确定表面风与应力之间的关系（由阻力系数表示）会导致一个隐式方程，该方程将以迭代方式求解。在本文中，提出了一种拟合，该拟合直接根据风速表达中性阻力系数和表面粗糙度，而无需迭代。由于拟合完全是无量纲的，因此它能够在风速，水平高度和Charnock参数的值的整个范围内产生准确的结果，对于这些隐式方程式，这是有效的。

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  • 来源
    《Journal of Physical Oceanography》 |2011年第1期|p.247-251|共5页
  • 作者

    Hans Hersbach;

  • 作者单位

    European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading, RG2 9AX, United Kingdom;

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