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Langmuir circulation
White streaks in this lagoon are due to the Langmuir circulation.

Langmuir circulation is a wind driven helix circulation in the ocean with the axis almost parallel to the wind. Irving Langmuir discovered this phenomenon after noticing windrows of seaweed in the Sargasso Sea in 1938.[1]

The circulation was found to be 15° to the right of the wind in the northern hemisphere[2] and the helix forming bands of divergence and convergence at the surface. At the convergence zones floating seaweed, foam and debris will concentrate and form the bands Langmuir noticed in 1938. At the surface the circulation will set a current from the divergence zone to the convergence zone and the spacing between these zones are of the order 15–300 m. Below convergence zones narrow jets of downward flow form and the magnitude of the current will be comparable to the horizontal flow. The downward propagation will typically be in the order of meters or tenths of meters and will not penetrate the pycnocline. The upwelling will generally be less intense and take place over a wider band under the divergence zone.

In an observation done at windspeeds of 14 m s−1 the horizontal spacing of the cells were 20 m and maximum vertical velocity was -18 cm s−1.

References

  1. ^ The open university, Ocean circulation Butterworth Heinemann second edition 2001
  2. ^ Stewart, Robert H., Introduction To Physical Oceanography, Copyright 2002 Fall 2002 Edition

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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

English

Etymology

From Irving Langmuir American chemist and physicist

Noun

Langmuir circulation

  1. a form of cylindrical motion found in the near-surface waters of lakes and oceans under windy conditions, characterized by lines or streaks of seaweed etc (called windrows) roughly parallel to the wind

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