Semiannual oscillation

From Glossary of Meteorology

semiannual oscillation

That component of the annual cycle of a variable that consists of a sinusoidal oscillation with a period of six months.

Strong semiannual signals in thermal and momentum fields of the troposphere are found in both the Tropics (especially in the eastern hemisphere) and in the oceanic regions of Southern Hemisphere middle and high latitudes.

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