Before revision: A more accurate model is a linear Taylor series approximation to this variability about a given latitude : , where is the Coriolis parameter at , , is the meridional distance from , is the angular rotation rate of the Earth, and is the Earth's radius.
After revision: is the Rossby parameterA more accurate model is a linear Taylor series approximation to this variability about a given latitude : , where is the Coriolis parameter at , , is the meridional distance from , is the angular rotation rate of the Earth, and is the Earth's radius.