无形海浪如何在海洋中运送物质

Garbage, nutrients¹ and tiny animals are pushed around, suspended in the world's oceans by waves invisible to the naked eye according to a new 3-D model developed by mathematicians² at the University of Waterloo. David Deepwell, a graduate student, and Professor Marek Stastna in Waterloo's Faculty³ of Mathematics have created a 3-D simulation that showcases how materials such phytoplankton, contaminants, and nutrients move within aquatic⁴ ecosystems⁵ via underwater bulges⁶ called mode-2 internal waves. 

 

The simulation can help researchers understand how internal waves can carry materials over long distances. Their model was presented in the American Institute of Physics' journal Physics of Fluids earlier this week. 

 

In the simulation, fluids of different densities⁸ are layered like the layers of a cake, creating an environment similar to that found in large aquatic bodies such as oceans and lakes. A middle layer of fluid, known as a pycnocline, over which the layers are closely packed together is created, and it is in this layer that materials tend to be caught. 

 

"When the fluid behind the gate is mixed and then the gate is removed, the mixed fluid collapses⁹ into the stratification because it is both heavier than the top layer and lighter¹⁰ than the bottom one," explained Deepwell, "Adding dye to the mixed fluid while the gate is in place simulates the material we want the mode-2 waves - the bulges in the pycnocline formed once the gate is taken away - to transport. We can then measure the size of the wave, how much dye remains¹¹ trapped within it, and how well the wave carries its captured material."

 

Deepwell and Statsna found that the larger the bulge⁷ within the pycnocline, the larger the amount of material carried by the mode-2 wave. 

 

While they have discovered an optimal¹² scenario¹³ in which the mode-2 internal wave survives and then transports material for as long a distance as possible, the internal waves can also break down due to small regions of instability, called lee instabilities, that form behind the wave. When the mode-2 wave breaks down, material is lost behind the wave. Ongoing¹⁴ experimental work and simulations are exploring how this type of wave interacts with underwater topography like sea mounts.

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