Рис. spirale f d ́Ekman s espiral f de Ekman g Ekman-Spirale f El Niño; southern oscillation The abnormal warming of ocean water off the west coast of. Vagn Walfrid Ekman Category:Ekman spiral cawiki Espiral d’Ekman; dewiki Korkenzieherströmung; enwiki Ekman spiral; eswiki Espiral de Ekman; etwiki. elbow EHT~; – rectffier u TV válvula rectificadora de MAT/; – supply n rv spiral n OCEAN espiral de Ekman m elaeolite n MINERAL eleolita / nefelma.
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Espiral d’Ekman – Viquipèdia, l’enciclopèdia lliure
The speed and direction of the moving water changes with depth. Ocean water at the surface moves at an angle to the wind, and the water under the surface water turns a bit more, and the water below that turns even more.
Journal of Geophysical Research. If this media file espirl useful, then it should be transferred to the Wikimedia Commons. Because the Earth rotates, surface water moves to the right of the wind direction espirall the Northern Hemisphere and to the left of the wind direction in the Southern Hemisphere due to the Coriolis effect.
This phenomenon would later become known as Ekman transport. Retrieved from ” https: This file was suggested for transfer by a bot User: For three years, Nansen and his ship drifted through the Arctic.
This is due both to the fact that the turbulent mixing in the surface layer of the ocean has a strong diurnal cycle and to the fact that surface waves can destabilize the Ekman spiral. But he did have lots of time to sspiral observations of the environment. Dde File history File usage No higher resolution available.
Camada de Ekman
An Ekman spiral A is a rotating ekmxn of water that forms when water moves at an angle to the wind epsiral due to the Coriolis Effect. To help him make a mathematical model of these movements, Ekman used the observations that Fridtjof Nansen made while frozen into the Arctic sea ice. Eventually, the current will reach a top speed when the force of the wind, of the Coriolis effect, and the resistant drag of the subsurface water balance, and the current will flow at a constant speed and direction as long as the wind persists.
One of his observations was that the ice was not moving in the same direction as the wind. This surface current drags on the water layer below it, applying a force in its own direction of motion to that layer, repeating the process whereby that layer eventually becomes a steady current even further to the right of the wind, and so on for deeper layers of water, resulting in a continuous rotation or spiraling of current direction with changing depth.
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The effect is a consequence of the Coriolis effect which subjects moving objects to an apparent force to the right of their direction of motion in the northern hemisphere and to the left in the Southern Hemisphere.
The Ekman spiral and Ekman transport are named for Swedish scientist V.
Archived from the original on In other projects Wikimedia Commons. It derives its name from the Swedish oceanographer Vagn Walfrid Ekman.
Wikimedia Commons has media related to Ekman spiral. The deflection of surface currents was first noticed by the Norwegian oceanographer Fridtjof Nansen during the Fram expedition — emman the effect was first physically explained by Vagn Walfrid Ekman. The first documented observations of an oceanic Ekman spiral were made in the Arctic Ocean from a drifting ice floe in wkman He thought that trapped in sea ice, which moves with ocean currents, he would get to the North Pole eventually.
As a work of the U. This page was last edited on 4 Decemberat This makes a spiral of moving water to meters to ft deep called an Ekman spiral. The average direction of all this turning water is about a right angle from the wind direction. This media file is either in the public domain or published under a free licenseand contains no inbound file links. Surface winds in the Northern Hemisphere tend to blow to the left of winds aloft. Skip to main content.
The force from above is in red beginning with the wind blowing over the water surfacethe Coriolis force which is shown at right angles to the force from above when it should in fact be at right angles to the actual water flow is in dark yellow, and the net resultant water esiral is in sspiral, which then becomes the force from above for the layer below it, accounting for the gradual clockwise spiral motion as you move down. He did this on ekma. Common to several of these observations spirals were found to be ‘compressed’, displaying larger estimates of eddy viscosity when considering the rate of rotation with depth than the eddy viscosity derived from considering the rate of decay of speed.
The classic Ekman spiral has been observed under sea ice,  but observations remain rare in open-ocean conditions. Summary [ edit ] http: If the file lacks a description you can check edits the uploader made just after uploading this file with this tool.
Ekman spiral – Wikidata
Retrieved from ” https: As the flow is now somewhat right of the wind, the Coriolis force perpendicular to the flow’s motion is now partly directed against espral wind. This page was last edited on 25 Augustat The example shown above is for the Northern Hemisphere. Views Read Edit View history. If this media is not useful, please propose it for deletion or list it at files for discussion.