https://oceanwiki.ethz.ch/ 2026-10-02T18:11:59+00:00 https://oceanwiki.ethz.ch/ https://oceanwiki.ethz.ch/lib/exe/fetch.php?media=wiki:logo.png text/html 2015-02-20T19:29:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://oceanwiki.ethz.ch/doku.php?id=lecture11:ebus&rev=1424460596&do=diff EBUS Author: Nora Gallarotti Definition Eastern Boundary Upwelling Systems (EBUS) are characterized by a high productivity of plankton associated with large commercial fisheries, thus playing key biological and socio-economical roles. The western margins of continents are typically affected by upwelling of cold nutrient and DIC rich waters to the surface. text/html 2014-07-01T10:01:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://oceanwiki.ethz.ch/doku.php?id=lecture11:phasevelocities&rev=1404208907&do=diff Phase and Group Velocity Author: Hannah Wey 1. Phase velocity A wave transfers energy from one part of a material to another, in this case in a water body. Important terms related to waves are wave height H [m] wavelength L [m] period T [s] phase velocity c or c(p) [m/s] group velocity c(g) [m/s] wave number k [m-1] = 2π/L angular frequency ω [s-1] = 2π/T = c*k amplitude a [m] frequency f [s-1] = 1/T text/html 2014-08-16T20:25:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://oceanwiki.ethz.ch/doku.php?id=lecture11:shallow_waves&rev=1408220745&do=diff Gravity waves Author: Leonardo Echeverria These are called gravity waves because gravity is the restoring force that perpetuates them [2]. Examples of these are surface waves, which are the result of the interaction between wind and the ocean; and tides, which are the result of gravitational attraction of the sun and the moon [4].$c$$$c = \sqrt{\frac{g L}{2\pi}tanh(\frac{2\pi d}{L})} = \frac{L}{T}$$$L$$T$$f=1/T$$k=\frac{2\pi}{L}$$\sigma = \frac{2\pi}{T}$$c_{g}$$c_{g}= \frac{\sigma_{1}-\sigma_{… text/html 2014-07-01T09:54:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://oceanwiki.ethz.ch/doku.php?id=lecture11:southocean&rev=1404208488&do=diff Southern Ocean Circulation Author: Olivia The Southern Ocean circulation consists of the cyclonic subpolar gyres in the Weddell and Ross Seas, the polar current and as the predominant feature of this region: the Antartic Circumpolar Current (ACC). It is the world's biggest ocean current and the only current that flows completely around the globe without encountering any land barrier. This feature enables to keep warm water away, letting the continent maintain it's huge ice sheet. As a result o… text/html 2015-05-26T07:48:22+00:00 Anonymous (anonymous@undisclosed.example.com) https://oceanwiki.ethz.ch/doku.php?id=lecture11:tsunami&rev=1432626502&do=diff Tsunami Authors: Kilian Aregger (2015), ​Yuan Jin (2014) Definition A tsunami (Japanese word for “harbour wave”) is a series of waves in a ocean or a large lake caused by the displacement of a large volume of water. Reasons for such a displacements are earthquakes, volcanic eruptions and other underwater explosions, landslides, glacier calvings, meteorite impacts. In contrast to wind-driven sea waves, tsunami waves have a far longer wavelength. On the open ocean the waves are hardly viewable …