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The '''Rossby parameter''' (or simply beta <math>\beta</math>) is a number used in [[geophysics]] and [[meteorology]] which arises due to the meridional variation of the [[Coriolis force]] caused by the spherical shape of the Earth. It is important in the generation of [[Rossby wave]]s. | |||
The Rossby parameter <math>\beta</math> is given by the equation: | |||
:<math>\beta = \frac{\partial f}{\partial y} = \frac{1}{a} \frac{d}{d\phi} (2 \omega sin\phi) = \frac{2\omega cos\phi}{a} </math><ref>[http://amsglossary.allenpress.com/glossary/search?id=rossby-parameter1 Glossary of Meteorology], American Meteorological Society.</ref><ref>[http://mesolab.meas.ncsu.edu/~linyl/mea713/Ch1_Note.doc Lecture Notes] for Atmospheric Science Mesoscale Dynamics (MEA 713). [[North Carolina State University]]. Accessed 14 July 2007.</ref> | |||
Where <math>\phi</math> is the latitude, <math>\omega</math> is the angular speed of the Earth's rotation, and '''a''' is the mean radius of the Earth. | |||
Although both involve Coriolis effects, the Rossby parameter describes the ''variation'' of the effects with latitude (hence the latitudinal [[derivative]]), and should not be confused with the [[Rossby number]]. | |||
==References== | |||
<references/> | |||
{{climate-stub}} | |||
[[Category:Atmospheric dynamics]] | |||
Revision as of 23:55, 19 October 2013
The Rossby parameter (or simply beta ) is a number used in geophysics and meteorology which arises due to the meridional variation of the Coriolis force caused by the spherical shape of the Earth. It is important in the generation of Rossby waves.
The Rossby parameter is given by the equation:
Where is the latitude, is the angular speed of the Earth's rotation, and a is the mean radius of the Earth.
Although both involve Coriolis effects, the Rossby parameter describes the variation of the effects with latitude (hence the latitudinal derivative), and should not be confused with the Rossby number.
References
- ↑ Glossary of Meteorology, American Meteorological Society.
- ↑ Lecture Notes for Atmospheric Science Mesoscale Dynamics (MEA 713). North Carolina State University. Accessed 14 July 2007.
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