ABSTRACT

We study the shape of convective rolls in the Marine Atmospheric Boundary Layer from Synthetic Aperture Radar images of the ocean. We propose a multiscale analysis with structure functions which allow an easy generalization to analyse high-order statistics and so to finely describe the shape of the rolls. The two main results are 1) second-order structure function characterizes the wavelength and direction of rolls just like correlation or power spectrum do, 2) high-order statistics can be studied with skewness and flatness which characterize the asymmetry and intermittency of rolls, respectively. This is the first time that the asymmetry and intermittency of rolls are shown from radar images of the ocean surface.

摘要

我们从海洋的合成孔径雷达图像研究海洋大气边界层中对流卷的形状。我们提出了一种具有结构函数的多尺度分析，它可以轻松概括分析高阶统计数据，从而精细地描述轧辊的形状。两个主要结果是 1) 二阶结构函数像相关性或功率谱一样表征轧辊的波长和方向，2) 高阶统计可以用分别表征轧辊的不对称性和间歇性的偏度和平坦度来研究. 这是第一次从海面的雷达图像中显示滚动的不对称和间歇性。