An Improved Calculation of Coriolis Terms on the C Grid

Dobricic, Srdjan
December 2006
Monthly Weather Review;Dec2006, Vol. 134 Issue 12, p3764
Academic Journal
The central differencing grid with fully staggered velocity components (C grid) is widely used in primitive equation oceanographic models despite potential problems in simulating baroclinic inertia–gravity and Rossby waves that can arise due to the averaging of velocity components in the Coriolis terms. This note proposes a new averaging of the velocity components in order to calculate the Coriolis terms on the C grid. The averaging weights are calculated from the minimum of a suitably defined cost function that optimally minimizes the error in the inertial part of frequencies of inertia–gravity waves and maintains the second-order accuracy of the computations. The theoretical analysis of wave frequency diagrams shows that the new scheme results in more accurate frequencies of long inertia–gravity and Rossby waves, especially when the Rossby radius of deformation is not well resolved by the grid resolution.


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