风和海浪通过波引发的空气流动的动态合
T S Hristov1, S D Miller, C A Friehe
1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA. Tihomir.Hristov@jhu.edu
Nature
|March 7, 2003
概括
这项研究揭示了海洋波以上的空气流结构,与关键层理论保持一致. 这一发现挑战了空海运动量转移的简单,通用模型的想法.
科学领域:
- 流体动力学 流体动力学
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
背景情况:
- 风波合对于海洋波浪产生至关重要.
- 之前的模型假设同步的空气流动波动,但直接观察具有挑战性.
- 了解这种相互作用是气候和天气建模的关键.
研究的目的:
- 为了研究风力驱动的海洋波浪生成的物理机制.
- 为了分析波浪诱导的空气流在开放的海洋上的空间和时间结构.
- 测试现有的风波合理论的有效性.
主要方法:
- 对观察到的风速和海洋表面高度的分析.
- 应用线性过器来隔离波引起的空气流.
- 观察数据与临界层理论的比较.
主要成果:
- 观察到的波引起的空气流结构与临界层理论的预测相匹配.
- 波引起的动量流量取决于波谱.
- 动量流动显示了显著的垂直变化.
结论:
- 这项研究提供了支持风波合中的关键层理论的观测证据.
- 对于空海总动量流的简单,普遍适用的参数化不太可能.
- 需要进一步的研究来理解动量转移的复杂垂直动态.
相关概念视频
Interference and Diffraction
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Laminar and Turbulent Flow
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...
Damped Oscillations
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
Shock Waves
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
Electromagnetic Waves
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
Introduction to Vector Fields
Vector fields provide a mathematical framework for describing quantities that possess both magnitude and direction at every point in space. Physical phenomena such as wind flow, ocean currents, magnetic forces, and fluid motion can all be represented using vector fields. In meteorology, for example, wind may vary continuously across a geographic region, with both speed and direction changing from one location to another. To visualize this behavior on a two-dimensional map, arrows are placed at...


