Modeling of wave-induced irradiance fluctuations at near-surface depths in the ocean: a comparison with measurements.
Modeling of wave-induced irradiance fluctuations at near-surface depths in the ocean: a comparison with measurements.
复制标题
海洋近地表深度波浪引起的辐照度波动的建模：与测量结果的比较。
作者：
Y. You;D. Stramski;M. Darecki;G. Kattawar
我们开发了一个计算快速的辐射传输模型，用于模拟近地表深度的水下下沉流辐照度E（d）的波动，这是由于风驱动的表面波聚焦太阳光而发生的。该模型是基于混合矩阵算子-蒙特卡罗方法，这是专门设计用于模拟辐射传输的耦合大气-表面-海洋系统，包括一个动态的海洋表面。在当前版本的模型中，我们使用了表面波的简化描述，它考虑了表面坡度统计，但不是表面波高程，作为水下光波动的直接来源。我们比较模型的测量结果在圣巴巴拉海峡。模型模拟的E（d）（t）时间序列与实测的E（d）（t）时间序列具有显著的相似性。瞬时辐照度的概率分布的主要特征，辐照度波动的频率内容，以及由波聚焦产生的闪光的统计特性也通常是一致的模型模拟和测量的几个近地表深度和光波长检查。尽管简化了表面波的表示，该模型提供了一个合理的一阶近似建模波聚焦效应在近地表深度，这需要高的时间和空间分辨率（1毫秒和1毫米的顺序，分别），以充分解决。
We develop a computationally fast radiative transfer model for simulating the fluctuations of the underwater downwelling irradiance E(d) at near-surface depths, which occur due to focusing of sunlight by wind-driven surface waves. The model is based on the hybrid matrix operator-Monte Carlo method, which was specifically designed for simulating radiative transfer in a coupled atmosphere-surface-ocean system involving a dynamic ocean surface. In the current version of the model, we use a simplified description of surface waves, which accounts for surface slope statistics, but not surface wave elevation, as a direct source of underwater light fluctuations. We compare the model results with measurements made in the Santa Barbara Channel. The model-simulated and measured time series of E(d)(t) show remarkable similarity. Major features of the probability distribution of instantaneous irradiance, the frequency content of irradiance fluctuations, and the statistical properties of light flashes produced by wave focusing are also generally consistent between the model simulations and measurements for a few near-surface depths and light wavelengths examined. Despite the simplification in the representation of surface waves, this model provides a reasonable first-order approximation to modeling the wave focusing effects at near-surface depths, which require high temporal and spatial resolution (of the order of 1 ms and 1 mm, respectively) to be adequately resolved.